E30 the biowaste - metamorphosis to M52

[ForcedFirebird]

Also check pivot ball.

Oh man, do I have whoppers for stories about endurance racing. Probably changed half a dozen engines over the years, crashes, wheels snapped in half, but the best one was a two day event (practice and race). The main engine got overheated and the rookie driver didn't notice the gauges. Changed the motor that night, raced in the morning. About three hours in we lose oil pressure on the replacement engine. Since we had another car in the race doing well, we took the crank bearings from the first engine, dropped the oil pan in the car, and put them in the low oil pressure engine right there in the parking lot. We lost about 2.5hrs of racing time, but the repair made the race - but by the time it was over, we were losing pressure again (probably smoked oil drive bearings)..

[hasa]

I installed 30mm bearing, checked the fork to be ok, shimmed pivot pin 3,5mm. Pedal feel is still like rubber. I hope it works when I get engine running or I lose my mind with the car.

Adjustable pivot pin would be great solution. I wonder why BMW did not have that already from factory, when other Getrag clients like Opel did in 80’s.

[hasa]

Clutch seem to work at least when running on jack stands. So next mod is the front stabilizer. 1.5 weeks to next races.

[moatilliatta]

Thats pretty rad, what are you using for 5 lug?

[Digitalwave]

What an awesome car!

[hasa]

Thanks for comments! 5-lug setup is based on E36 spindles/hubs. Rear is Z3/ti stuff.

Everything seems to work ok now. Engine might have slightly more power than before as AFR went immediately 10-15% leaner on WOT.

[hasa]

First races went quite ok. I'm rusted as driver, but it was fun.

Unfortunately engine management gets crank trigger errors constantly @ 7000 and cannot get over it. But below that it pulls as expected.

[ForcedFirebird]

Try adjusting air gap.

[hasa]

I haven't yet explored the crank trigger issue further, but logs revealed also problems with voltage. So it was time for some ebaying again.

[hasa]

BNR alternator works great. Voltage stays over 14 in all situations.

I have also been debugging the crank trigger problem. New sensor made no difference, but then I increased the air gap up to 1.85mm and engine ran well to the redline 7500rpm.

By looking injection time curve and lambda it looks that engine would love even more revs. RHD roller rocker kid would now help…

[2mAn]

Love this car

[ForcedFirebird]

I have also been debugging the crank trigger problem. New sensor made no difference, but then I increased the air gap up to 1.85mm and engine ran well to the redline 7500rpm

I've noticed aftermarket ECU's don't like the air gap too tight. The stock ECU doesn't like it too far away (in fact, likes it best almost touching). Often times when installing a plug and play, I will have to fudge the sensor bracket.

[moatilliatta]

Could you run 12v to the sensor?

[hasa]

Could you run 12v to the sensor?

In theory I could. I'm using currently British engine management product DTA (model S60) which supports also hall sensors. But problems with hall sensors are another story, they are sensitive to heat which can cause sometimes troubles.

[hasa]

Dyno day result was something I expected from log data. 3 degrees more ignition advance gained 10hp compared to my guesstimates. Values are bhp as we tend to measure. Unfortunately raw whp is not included in graphs but numbers aren’t comparable between dynos anyway.