R56 Race Car
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08-23-2014, 01:45 PM
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R56 Race Car
...and its issues!
Hello from the UK - quick intro, we run a race team over here, with all sorts of cars from 130bhp miata's up to 300+bhp miatas, various old Porsches, BMW M3 and CSL etc, FunCup cars and the like, be we have just taken on an R56 JCW Endurance Car, taken over from another race company and we have to pick up the pieces.
I'm here to pick your brains :D
So we get the car to our workshop, missing a load of parts, data logger, radio, xenons etc, but thats easy stuff, just annoying. The main issue is the bodywork -easily remedied with a few new parts and a trip through the bodyshop. The other issue is a massive fuelling problem, anything less than half a tank and on hard corners a misfire. Not good at all.
So off we go investigating. The trunk has a 1.5 litre swirl pot, and a motorsport pump, it also has a pressure reg, and a return to the tank, so its a single line feed to the front - no problem with that, its common on race cars.
The intank pumps are still there, well it looked like it but from the plumbing they couldnt be, we pulled them out both sides of the tank to find nothing but a dangle of pipe sitting in the fuel - not the best. This was then "lifted" using gravity fed pumps, which sat above the fuel tank (go figure), no baffle foam, no tank swirl or anything.
So we purchased a set of intank pumps, as the system is quite good, they now feed our swirl pot, and the motorsport pump sends to the front. Problem sorted - a quick trip to the dyno showed 215bhp (167 FWHP) which for a decatted, remapped JCW isn't the best.
Race day arrives, two hours practice and qually goes well, then, third lap into the 6 hour race, car disappears. What a sh*t.
From initial sound and investigation, it appears the diff has locked (it was making a terrible noise) and it all went wrong from there.
What has actually happened, unsure on the order though, was...
Clutch splines stripped from plate
Gearbox input shaft is seriously worn (no dowel fitted between box and engine)
Quaife ATB diff is massively worn.
To start...
Knowing that we have to rebuild a box, buy a new diff, we figured, is it worth checking the turbo over and rebuilding the engine??
Probably - turbo looked awful too...
The pics say it all really.
Have a looksy...
https://www.flickr.com/photos/108993...7646326935027/
Hello from the UK - quick intro, we run a race team over here, with all sorts of cars from 130bhp miata's up to 300+bhp miatas, various old Porsches, BMW M3 and CSL etc, FunCup cars and the like, be we have just taken on an R56 JCW Endurance Car, taken over from another race company and we have to pick up the pieces.
I'm here to pick your brains :D
So we get the car to our workshop, missing a load of parts, data logger, radio, xenons etc, but thats easy stuff, just annoying. The main issue is the bodywork -easily remedied with a few new parts and a trip through the bodyshop. The other issue is a massive fuelling problem, anything less than half a tank and on hard corners a misfire. Not good at all.
So off we go investigating. The trunk has a 1.5 litre swirl pot, and a motorsport pump, it also has a pressure reg, and a return to the tank, so its a single line feed to the front - no problem with that, its common on race cars.
The intank pumps are still there, well it looked like it but from the plumbing they couldnt be, we pulled them out both sides of the tank to find nothing but a dangle of pipe sitting in the fuel - not the best. This was then "lifted" using gravity fed pumps, which sat above the fuel tank (go figure), no baffle foam, no tank swirl or anything.
So we purchased a set of intank pumps, as the system is quite good, they now feed our swirl pot, and the motorsport pump sends to the front. Problem sorted - a quick trip to the dyno showed 215bhp (167 FWHP) which for a decatted, remapped JCW isn't the best.
Race day arrives, two hours practice and qually goes well, then, third lap into the 6 hour race, car disappears. What a sh*t.
From initial sound and investigation, it appears the diff has locked (it was making a terrible noise) and it all went wrong from there.
What has actually happened, unsure on the order though, was...
Clutch splines stripped from plate
Gearbox input shaft is seriously worn (no dowel fitted between box and engine)
Quaife ATB diff is massively worn.
To start...
Knowing that we have to rebuild a box, buy a new diff, we figured, is it worth checking the turbo over and rebuilding the engine??
Probably - turbo looked awful too...
The pics say it all really.
Have a looksy...
https://www.flickr.com/photos/108993...7646326935027/
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