Rally Computer install into 107

Model 107 Specific Mods -
We seem to have a lot of posts around this particular model, I wonder why?!!???
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Greg in Oz
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Rally Computer install into 107

Post by Greg in Oz » Mon 01 Mar, 2010 7:27 pm

Now that I'm enjoying classic car rallying in my 500SLC, I decided that a tripmeter for my navigator would be a worthwhile addition to the car. The factory 5 litre SLC rally cars used the popular 1970s Halda Twinmaster for this purpose, and whilst such a unit would give a nice authentic appearance, they are now difficult to find and expensive when they do become available. The modern electronic equivalents known as rally computers are more affordable and way ahead of the old mechanical Halda in features, ease of calibration, function and visibility of the displays.

I also considered that my 500SLC is to remain as an original road car, and whilst it would be nice that any mods appear as they did on the original factory rally cars, I also want any mods to be easily removed and completely reversible. I have a desire to perhaps one day build a replica of the factory SLC rally cars however my 500SLC is not the car for this project, being both the wrong colour combination (in and out) and too nice and original to permanently modify. For this reason, when a used Terratrip 303+ rally computer was recently offered for sale, I bought it with the intention of being able to mount it temporarily in any of my cars.

The challenge was to find a suitable location in the car for the Terratrip and to mount it without drilling a single hole and wire it in without cutting a single wire. Whilst this proved time consuming, I'm pleased to report that I was able to achieve this and in such a way that it can be removed in a matter of minutes. The steel mounting bracket I fabricated has the advantage that whilst it is designed to fit my left hand drive 500SLC, it will fit equally well into my right hand drive 350SLC. It makes use of two of the screws on the inside of the glove box lid. Whilst the Terratrip is ideally positioned in front of the navigator, it drops down with the glove box lid allowing normal access to the glove box.

The Terratrip is powered by the car's electrics and is designed to accept its input signal from a "wheel probe". The probe is a proximity sensor that is usually mounted to look at rotating metal parts such as the mounting bolts for a brake disk. Alternatively, it is possible to use the pulses used for electronic speedometers and cruise controls in cars so equipped. Being a late 107, my 500SLC does not use a mechanical speedo cable but instead sends pulses from the transmission to the instrument cluster and cruise control. I made up a simple interface circuit that picks up the pulses at the cruise control. This technique will also work on my other MBs which have mechanically driven speedos but generate pulses for the cruise control with a hall effect sensor in the back of the speedo.

I connected the pulse signal wires at the soldered connections within the connector for the cruise control so no wires were cut or modified. Power was obtained at a screw terminal within the fuse box and the chassis earth connection made at a main earth screw terminal nearby. The additional wiring can be removed without leaving a trace of ever having been there.

Whilst the Terratrip has a connector on its rear, it is not really designed to be repeatedly connected and disconnected. I instead fitted rugged Cannon connectors (6 way versions of the 3 way XLR type used in professional audio applications). These connectors are positioned such that they can be hidden under the carpet out of sight and out of the way. Again, no holes needed to be drilled. A cable clip used to keep the removable section of the cable neat whilst the Terratrip is installed makes use of an existing screw.

With everything installed it was time to calibrate the Terratrip to suit the car. I initially did this using the car's tripmeter and then verified it with a GPS. It is interesting to note how accurate the car's tripmeter is when compared to the GPS. Whilst the speedo in the 500SLC doesn't read around 5% high like our other cars, it is interesting to note how the damping of its movement causes it to read low whilst accelerating and high whilst decelerating. At a steady speed though it is nice to see the speedo, GPS and Terratrip all in agreement.

The photos below show the Terratrip, the mounting bracket I fabricated, the wiring harness, and how it all fits into the car.
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107023 - 350SLC: 1973, 3sp auto, icon gold, parchment MBtex (sold July 2012 after 29 years ownership)
107026 - 500SLC: 1981, 4sp auto, thistle green, green velour
124090 - 300TE: 1990, 4sp auto, arctic white, cream-beige MBtex
124090 - 300TE: 1992, 4sp auto, malachite (spruce green), black MBtex
201024 - 190E-2.0: 1985, 5sp manual, black, black MBtex
201028 - 190E-2.3 Sportline: 1990, 5sp manual, arctic white, blue leather
201028 - 190E-2.3: 1992, 4sp auto, blueblack, grey MBtex
201028 - 190E-2.3 Sportline: 1990, 4sp auto, signal red, black cloth (parts car)
201034 - 190E-2.3-16 Cosworth: 1985, 5sp manual, blueblack, black leather
YG2S8 - Mini Clubman GT: 1972, 4sp manual, blue, parchment vinyl (my first car which I still own)

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Re: Rally Computer install into 107

Post by Greg in Oz » Mon 01 Mar, 2010 7:32 pm

And in the car...
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107023 - 350SLC: 1973, 3sp auto, icon gold, parchment MBtex (sold July 2012 after 29 years ownership)
107026 - 500SLC: 1981, 4sp auto, thistle green, green velour
124090 - 300TE: 1990, 4sp auto, arctic white, cream-beige MBtex
124090 - 300TE: 1992, 4sp auto, malachite (spruce green), black MBtex
201024 - 190E-2.0: 1985, 5sp manual, black, black MBtex
201028 - 190E-2.3 Sportline: 1990, 5sp manual, arctic white, blue leather
201028 - 190E-2.3: 1992, 4sp auto, blueblack, grey MBtex
201028 - 190E-2.3 Sportline: 1990, 4sp auto, signal red, black cloth (parts car)
201034 - 190E-2.3-16 Cosworth: 1985, 5sp manual, blueblack, black leather
YG2S8 - Mini Clubman GT: 1972, 4sp manual, blue, parchment vinyl (my first car which I still own)

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Re: Rally Computer install into 107

Post by AMG » Mon 01 Mar, 2010 10:01 pm

Nice neat job you've done there Greg!
That bracket looks like it took a bit of time to fabricate.

Super neat, and just what the Navigator needs.

Great Work.
Current:
1987 560SL 4sp. auto Signalrot "Stella"
1987 190E 2.3-16 5sp. man. Blauschwarz "Hermann"
1992 300CE-24 6sp. man. Perlblau / Iceblau "Gretel"
1992 Range Rover Classic 4sp auto Ardennes Green "Oswald"
2012 E63 AMG Speedshift MCT Diamantweiß "Klaus"
Previous:
1986 560SEL Anthracitgrau "Schultz" - In Mercedes Heaven
1987 190E 2.6 4sp. auto Signalrot "Sabine" - which now resides/owns Andrew M's Garage
1972 350SLC Astralsilber "Lurch" - now in the loving care of Craig B
1989 2.5-16 Blauschwarz 4sp. auto (parted) formerly owned by Derek/Hasan.
2012 Renault Sport Megane RS265 Trophy 8:08 6 sp. man. Liquid Yellow "Jean Rédélé"

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Re: Rally Computer install into 107

Post by Greg in Oz » Mon 01 Mar, 2010 11:39 pm

Thanks Joe,

Many of us in our younger days have performed somewhat permanent mods to cars that in hindsight we may have wished we didn't. Whilst my 500SLC isn't a concours car, it is very tidy and original, and being a rare beast I made the decision from the outset that I wouldn't perform any mod that couldn't simply be unscrewed to return it to original. I know some would prefer to see it without any mods at all, but I'm happy to go along with those that are tasteful and in keeping with the history of the 5 litre SLC as a factory homologation rally car. I've had my days of cleaning and displaying cars in static displays such as concours, and whilst I'm happy to show the 500SLC, I'm happier out driving it on country roads enjoying a spirited drive.

Greg
107023 - 350SLC: 1973, 3sp auto, icon gold, parchment MBtex (sold July 2012 after 29 years ownership)
107026 - 500SLC: 1981, 4sp auto, thistle green, green velour
124090 - 300TE: 1990, 4sp auto, arctic white, cream-beige MBtex
124090 - 300TE: 1992, 4sp auto, malachite (spruce green), black MBtex
201024 - 190E-2.0: 1985, 5sp manual, black, black MBtex
201028 - 190E-2.3 Sportline: 1990, 5sp manual, arctic white, blue leather
201028 - 190E-2.3: 1992, 4sp auto, blueblack, grey MBtex
201028 - 190E-2.3 Sportline: 1990, 4sp auto, signal red, black cloth (parts car)
201034 - 190E-2.3-16 Cosworth: 1985, 5sp manual, blueblack, black leather
YG2S8 - Mini Clubman GT: 1972, 4sp manual, blue, parchment vinyl (my first car which I still own)

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Re: Rally Computer install into 107

Post by SELfor50 » Tue 02 Mar, 2010 11:13 am

Very tidy install Greg. Understand where you're coming from with 'irreversible' modifications. Basically I realised when I'd done too many of those on my first 450, that was what made me to decide to go all the way and strip the bastard out. :oops:

Quick questions also, did you use a mirror when taking the photo's? It seems that the steering wheel is on the wrong side of the car?! :P


Side question - are you entered into the FOSC event at Mount Panorama at Easter?? Be nice to see at least one other benz there... 8)

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Re: Rally Computer install into 107

Post by CraigB » Tue 02 Mar, 2010 1:34 pm

That looks good Greg. I remember from my old dirt rallying days when electronic units were coming in was the advantage of the probe is that if fitted on a front wheel it is more accurate and consistent than a spinning rear one or speedo. I had a metal case twinmaster which drove off a cable t at the rear of the speedo and there was a whole swag of gears with it so you could adjust the gearing for say a loose surface rally or tarmac - hence a lot less stuffing around with the later ones. I sold the car to my brother who was intending to buy an electronic unit but I leant him the twinmaster to get him by for the first few rallies - never got it back!
Craig Baulderstone
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Re: Rally Computer install into 107

Post by Greg in Oz » Tue 02 Mar, 2010 11:51 pm

Cam & Craig,

Thanks for your comments of approval.

Craig, I can remember back to helping mates build up Datsun 1600 rally cars in the late 1970s and early '80s and navigating for them in forest rallies. Before the event there was always the "Halda check" to drive and then calculate to see if in the collection of Halda gears we had something that would give a closer reading to that of the survey car. We always erred on the side of a low reading to allow for wheelspin on the dirt which would cause the Halda to read high. Obviously picking up the signal for the Terratrip from the transmission/speedo/cruise control rather than a front wheel mounted probe will also give an error due to wheelspin however in classic rallies primarily on tarmac that won't be a problem for me. The Terratrip is just so much easier to calibrate than calculating and swapping all those Halda gears. The LCD displays are also easier to read than those small digits on the wheels in the Halda, especially when they became covered in dust. I also remember how everyone would fit a length of plastic hose to the zeroing knob on the Halda so it was easier to grab and pull to reset when bouncing around on rough forest roads. In my early days of navigating we only had a Halda Tripmaster with the single display which meant you could only record either intermediate or cumulative distances, not both like you could with the Halda Twinmaster. By comparison, the Terratrip 303+ allows display of intermediate and cumulative distances, instantaneous and average speeds, time of day and stopwatch. It also allows for two separate inputs (eg. two probes or speedo pulses and a probe) and can store two calibration numbers. All very convenient.

Cam, I'm not having a run at Bathurst at Easter although I'd like to try and get up there to have a look. I'm fairly sure some of the guys from a couple of the clubs I belong to are having a run. I drove the 500SLC up there for the same event in 2008 just to display the car and have a look at what the event was all about.

Joe, further to your comments re the Terratrip mounting bracket, yes it was time consuming to fabricate. At least with access to decent sheet metalworking facilities I was able to make a reasonable job of it. The fiddly part was getting it to fit over the glovebox lid perfectly so that it wouldn't interfere with the operation of the lid. I also wanted to go to the extra effort of pressing (rather than drilling) the countersinks for the screws for the Terratrip as I didn't want the screw heads protruding. One aspect of it all that did please me was the way the Terratrip fitted perfectly between the end of the glovebox lid and handle, leaving just enough room for the handle to operate in either direction. Also nice is the fact that all the mounting holes are perfectly symmetrical which means that it will fit either a RHD or LHD glovebox lid. One of those jobs that turned out even better than what I'd hoped for.

In case Giles reads this, yes, the light bar for the Cibie Super Oscars is still coming. It's just that other things like the Terratrip were higher priority.

Greg
107023 - 350SLC: 1973, 3sp auto, icon gold, parchment MBtex (sold July 2012 after 29 years ownership)
107026 - 500SLC: 1981, 4sp auto, thistle green, green velour
124090 - 300TE: 1990, 4sp auto, arctic white, cream-beige MBtex
124090 - 300TE: 1992, 4sp auto, malachite (spruce green), black MBtex
201024 - 190E-2.0: 1985, 5sp manual, black, black MBtex
201028 - 190E-2.3 Sportline: 1990, 5sp manual, arctic white, blue leather
201028 - 190E-2.3: 1992, 4sp auto, blueblack, grey MBtex
201028 - 190E-2.3 Sportline: 1990, 4sp auto, signal red, black cloth (parts car)
201034 - 190E-2.3-16 Cosworth: 1985, 5sp manual, blueblack, black leather
YG2S8 - Mini Clubman GT: 1972, 4sp manual, blue, parchment vinyl (my first car which I still own)

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Re: Rally Computer install into 107

Post by SELfor50 » Sat 06 Mar, 2010 5:55 pm

Hey Greg,

I say definitely try and get things up and running for next year. It seems like Charles Jardine from the FOSC is doing a bloody great job of organisation.
Communication about the event is top notch and mostly all questions are answered before being asked. Still a month out and we've all been advised of running groups, timing, availability of fuel (how/where/type), availability of tyres and other trade parts etc.... very very well organised. And at the end of the day, for the cost of the event - top value for money. Should end up with about 2hrs + track time, which on Mount Panorama - is worth every cent.

The 500SLC would love that place... Next year mate.. ;)

Be good support if you do make it along too mate.

Cam.

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Re: Rally Computer install into 107

Post by Greg in Oz » Tue 09 Mar, 2010 11:54 pm

Cam,

Keep us up to date with your preparation for Bathurst at Easter (maybe start a new topic). I'd like to try and find the time to get up there to watch and give you some support and maybe we can get some other OzBenzers along too. Time is the only issue what with preparing the 500SLC for numerous events this year as well as maintaining the other cars, doing home renovations and all those family activities and the kids' sport etc.

I gave the 500SLC a run in the Kosciuszko Classic Rally last weekend (info and results at http://www.classicrallyclub.com.au/ although no photos as yet). The newly installed Terratrip worked a treat and made my navigator's job much easier. Even my initial calibration (which was simply set to match the car's tripmeter) came out very close to what the survey car recorded. Over the RTA's measured 5km the survey car measured 5.03km and my Terratrip measured 5.02km. The event started in Goulburn early Saturday morning and used lots of great minor roads down into the western side of the Snowy Mountains for an overnight stop near Tumbarrumba before making our way back to Goulburn for the finish on Sunday afternoon. As always the car ran like a dream. Even with four on board and a full boot I still had other competitors comment on how well it performs. The performance of this car exceeds what the specs on paper suggest it should do. I suspect the strong and broad torque curve is what really makes it work well out on those twisty and hilly secondary roads. It was good to see a total of five MBs having a run. If any others here would like to give these events a go, either contact me or check it out on the Classic Rally Club's website.

Greg
107023 - 350SLC: 1973, 3sp auto, icon gold, parchment MBtex (sold July 2012 after 29 years ownership)
107026 - 500SLC: 1981, 4sp auto, thistle green, green velour
124090 - 300TE: 1990, 4sp auto, arctic white, cream-beige MBtex
124090 - 300TE: 1992, 4sp auto, malachite (spruce green), black MBtex
201024 - 190E-2.0: 1985, 5sp manual, black, black MBtex
201028 - 190E-2.3 Sportline: 1990, 5sp manual, arctic white, blue leather
201028 - 190E-2.3: 1992, 4sp auto, blueblack, grey MBtex
201028 - 190E-2.3 Sportline: 1990, 4sp auto, signal red, black cloth (parts car)
201034 - 190E-2.3-16 Cosworth: 1985, 5sp manual, blueblack, black leather
YG2S8 - Mini Clubman GT: 1972, 4sp manual, blue, parchment vinyl (my first car which I still own)

SELfor50
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Re: Rally Computer install into 107

Post by SELfor50 » Sun 14 Mar, 2010 10:50 pm

Greg in Oz wrote:Cam,

Keep us up to date with your preparation for Bathurst at Easter (maybe start a new topic). I'd like to try and find the time to get up there to watch and give you some support and maybe we can get some other OzBenzers along too. Time is the only issue what with preparing the 500SLC for numerous events this year as well as maintaining the other cars, doing home renovations and all those family activities and the kids' sport etc.

I gave the 500SLC a run in the Kosciuszko Classic Rally last weekend (info and results at http://www.classicrallyclub.com.au/ although no photos as yet). The newly installed Terratrip worked a treat and made my navigator's job much easier. Even my initial calibration (which was simply set to match the car's tripmeter) came out very close to what the survey car recorded. Over the RTA's measured 5km the survey car measured 5.03km and my Terratrip measured 5.02km. The event started in Goulburn early Saturday morning and used lots of great minor roads down into the western side of the Snowy Mountains for an overnight stop near Tumbarrumba before making our way back to Goulburn for the finish on Sunday afternoon. As always the car ran like a dream. Even with four on board and a full boot I still had other competitors comment on how well it performs. The performance of this car exceeds what the specs on paper suggest it should do. I suspect the strong and broad torque curve is what really makes it work well out on those twisty and hilly secondary roads. It was good to see a total of five MBs having a run. If any others here would like to give these events a go, either contact me or check it out on the Classic Rally Club's website.

Greg

Thanks Greg. Will do, did a whole bunch of work on Saturday and haven't ripped the pics off the camera yet. Will get that up tomorrow hopefully. Formula 1 time now. 8)

Understand re preperation - once all the other tasks are factored in (family, home duties, worke etc) it usually ends up being that prep become last minute instead of focus. :roll: one of those things.

Glad the terratrip went smoothly. Torque counts for everything. That's where the M117 and M100 engines are in their prime. They rev sweetly and never stop pulling.

I'll have to jump on board for one of the rally events sometime soon - wanting to get experience in all forms of the sport, and I think tarmac rally would be something that would be very very fun to do, just need to convince my co-driver that she'd enjoy it too.... :oops: :lol:

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Re: Rally Computer install into 107

Post by Giles » Mon 15 Mar, 2010 10:20 pm

Greg wrote,
"In case Giles reads this, yes, the light bar for the Cibie Super Oscars is still coming. It's just that other things like the Terratrip were higher priority."

Waiting, patience has become my middle name.

So much on the shopping list, when will it all end? Never I hope.

Regards,

Giles
1981 500SLC (Colour Black) Keeper car 'Lola' walks like woman, talks like a man
1999 E430 Avantgarde Royal Indigo (Colour 339) Mums Taxi 'Claudia'
1975 280CE Signal Red (Colour 568H) Project 'Ginger'
1980 C107 Classic White (resto project) 'Marilyn'
1999 W163 ML430 MB Search & Rescue Vehicle
1978 C107 350SLC Red 'Scarlett' the parts car. Quite frankly my dear, I don't give a damn.
http://www.kudoscc.com.au

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Re: Rally Computer install into 107

Post by TargaSL » Tue 23 Mar, 2010 10:58 am

Good to see Giles has stirred up a whole lot more motorsport interest

We are full on into targa prep with 34 days to go

Comments re truer reading are correct, the front wheel probe is much more accurate, more so on dirt. good to hear all the 70's guys offering advice. the era to true danger

nice mounting job on the terratrip, i will get a pic of mine but it has a special mod bracket that was part of the roll cage which is welded to the windscreen. So rock solid but not as Merc pretty as you guys. Though it is a dedicated car now so it makes it look more the part

One year we must all get together and do an event as Old Merc Club team or something

How about the silver arrows guys and their drifting boat
a perfect power slide the last car on the clip

I am glad i run an SL. At least i have got the shorter wheel base to flick the cat around more aggressively. Coupled with 600hp it gives me the option of putting the car just about anywhere you need it, short of the weight vector transfers

Maybe John G should put up a special club car racing forum??
PR
1980 W107 - Der Panzervagen
2003 R230 - Glamour
2011 W164 - AMG Diesel

Escape the Nanny State
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Re: Rally Computer install into 107

Post by Giles » Tue 23 Mar, 2010 2:19 pm

TargaSL wrote:Good to see Giles has stirred up a whole lot more motorsport interest

PR

Greg should be handed that mantle. I just stir pot, he provides the ingredients.

Regards,

Giles
1981 500SLC (Colour Black) Keeper car 'Lola' walks like woman, talks like a man
1999 E430 Avantgarde Royal Indigo (Colour 339) Mums Taxi 'Claudia'
1975 280CE Signal Red (Colour 568H) Project 'Ginger'
1980 C107 Classic White (resto project) 'Marilyn'
1999 W163 ML430 MB Search & Rescue Vehicle
1978 C107 350SLC Red 'Scarlett' the parts car. Quite frankly my dear, I don't give a damn.
http://www.kudoscc.com.au

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Re: Rally Computer install into 107

Post by Greg in Oz » Tue 23 Mar, 2010 6:05 pm

Giles wrote:
TargaSL wrote:Good to see Giles has stirred up a whole lot more motorsport interest

PR

Greg should be handed that mantle. I just stir pot, he provides the ingredients.

Regards,

Giles
I believe there's been some underlying motorsport interest here for a while. Our forum sponsor had a run for a while in his 280E rally car and has also given his 300CE-24 3.4 AMG a run at Wakefield. Craig B has been having a run at the track for quite a while and attempting to generate some more interest among MB enthusiasts and club members in his part of the world. SELfor50 and his mates with W116s (and more recently one with a turbo 190E) have also been having a run around the tracks in recent years and their stories have been well documented in the Victorian MB club magazine. My motorsport interests go back a long way but it has only been more recently (after a lengthy break) that I have become a bit involved again, primarily with classic road rallies (and motorkhanas with my eldest son) but I also couldn't pass up that last chance for a track day at Oran Park before it disappeared forever. In the Kosciuszko Classic Rally a few weeks back there were five MBs having a run, including sf0999 (who also ran at Oran Park) and oz coz who are both OzBenz forum members. TargaSL has been running the serious tarmac rallies and will soon be putting his latest efforts to the test. Most recently Giles has purchased his 350SLC with plans for it to see some rally action. I'm sure there are others here also with a motorsport interest and apologies to any I haven't mentioned.

Greg
107023 - 350SLC: 1973, 3sp auto, icon gold, parchment MBtex (sold July 2012 after 29 years ownership)
107026 - 500SLC: 1981, 4sp auto, thistle green, green velour
124090 - 300TE: 1990, 4sp auto, arctic white, cream-beige MBtex
124090 - 300TE: 1992, 4sp auto, malachite (spruce green), black MBtex
201024 - 190E-2.0: 1985, 5sp manual, black, black MBtex
201028 - 190E-2.3 Sportline: 1990, 5sp manual, arctic white, blue leather
201028 - 190E-2.3: 1992, 4sp auto, blueblack, grey MBtex
201028 - 190E-2.3 Sportline: 1990, 4sp auto, signal red, black cloth (parts car)
201034 - 190E-2.3-16 Cosworth: 1985, 5sp manual, blueblack, black leather
YG2S8 - Mini Clubman GT: 1972, 4sp manual, blue, parchment vinyl (my first car which I still own)

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Re: Rally Computer install into 107

Post by Notso Swift » Fri 26 Mar, 2010 8:57 pm

There is a 190 2.x-16 Cosworth (can't remember if it is 2.3 or 2.5) that runs in Improved Production Racing in South Australia every now and again, gets out once or twice a year.
Contrary to popular opinion, I do have mechanical sympathy, I always feel sorry for the cars I drive.
Racer - IPRA Vic #87

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