MB goes racing season 4
03-10-2015, 12:49 PM
#1
Member
Thread Starter
MB goes racing season 4
I was beginning to think I'd never see the car back up and running!
Basically last season was a total disaster. POS engine built by Urge failed and took an age to get fixed, reinstalled and mapped. I've had to fully fund the repair myself, which I still maintain is unacceptable for an engine lasting less than 100 miles for what this cost. It's been a big financial hit and ruined my race season.
The car was putting out a lot of power, at the advised 9500 Rev limit. It hit 275 whp (325 bhp) on TDI dyno, about 70bhp more than an S with a few breathing mods. But not much good if it destroys itself within miles.
I got it rebuild by a real expert in these engines, but he ditched the shaved 2.2 crank for a standard one as he said it was not a good idea to modify a crank like the one supplied. Same Pistons etc have been used, but the whole assembly has been very finely balanced. Given the heavier crank I was expecting it would be putting out less power... Anyway Romain mapped it today at SRR, and I requested an 8500 rpm limit. We found that it actually needed a lot more fuel from 8000 onwards, so it's making more power than before the rebuild! A real testament to how it's been put together, and it sounds unbelievably smooth. The cams appear to want to make power up to 9500 but there's no way it will run at those piston speeds.
End result is 240bhp at the wheels / 285 atf, but with close to 200 lbs ft torque
Not worth comparing the TDI and SRR graphs as they are totally different dynos, but on the TDI one you can see mine vs stock car, then assume it's probably now making even more at 8000 rpm onwards.
It's a beast on the road, especially given it's sub 1100kg weight and 4.4 diff
Other mods are a Koyo rad and 25 row oil cooler as the previous one was full of dead bearings. Added another Spa gauge for fuel pressure and coolant temp and also changed the intake setup with a couple of ducts.
Anyway, the plan is to get it on track and get some confidence in its reliability. I should make a handful of races this year, including Silverstone 40 minute race 10th May, possibly Rockingham the following weekend and Spa in June.
Fingers crossed!
Basically last season was a total disaster. POS engine built by Urge failed and took an age to get fixed, reinstalled and mapped. I've had to fully fund the repair myself, which I still maintain is unacceptable for an engine lasting less than 100 miles for what this cost. It's been a big financial hit and ruined my race season.
The car was putting out a lot of power, at the advised 9500 Rev limit. It hit 275 whp (325 bhp) on TDI dyno, about 70bhp more than an S with a few breathing mods. But not much good if it destroys itself within miles.
I got it rebuild by a real expert in these engines, but he ditched the shaved 2.2 crank for a standard one as he said it was not a good idea to modify a crank like the one supplied. Same Pistons etc have been used, but the whole assembly has been very finely balanced. Given the heavier crank I was expecting it would be putting out less power... Anyway Romain mapped it today at SRR, and I requested an 8500 rpm limit. We found that it actually needed a lot more fuel from 8000 onwards, so it's making more power than before the rebuild! A real testament to how it's been put together, and it sounds unbelievably smooth. The cams appear to want to make power up to 9500 but there's no way it will run at those piston speeds.
End result is 240bhp at the wheels / 285 atf, but with close to 200 lbs ft torque
Not worth comparing the TDI and SRR graphs as they are totally different dynos, but on the TDI one you can see mine vs stock car, then assume it's probably now making even more at 8000 rpm onwards.It's a beast on the road, especially given it's sub 1100kg weight and 4.4 diff
Other mods are a Koyo rad and 25 row oil cooler as the previous one was full of dead bearings. Added another Spa gauge for fuel pressure and coolant temp and also changed the intake setup with a couple of ducts.
Anyway, the plan is to get it on track and get some confidence in its reliability. I should make a handful of races this year, including Silverstone 40 minute race 10th May, possibly Rockingham the following weekend and Spa in June.
Fingers crossed!
03-10-2015, 01:31 PM
#7
Registered User
Good to see you've come through all that crap with Urge and out the other side with a great engine.
You're old one seems to be particularly fond of the twisty roads in the highlands!
All the best for the new season
You're old one seems to be particularly fond of the twisty roads in the highlands!
All the best for the new season
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03-10-2015, 01:48 PM
#9
Member
Thread Starter
Thanks all, will be sure to report progress.
It's set to cut revs to 3000 on 115/120 deg c oil temp, and same for pressure but can't remember what psi! I just have to tap a wire from the SPA to the ecu but it's all setup. Coolant temp cut too.
Honda VTEC Challenge previously, but will be racing it in CSCC modern classics this year.
I should never have sold that! Glad it's running well.
That's the plan!
Honda VTEC Challenge previously, but will be racing it in CSCC modern classics this year.
That's the plan!
