I remember them from my RX7 days when they split off from ForceFed, I thought they just did Japanese and more race orientated though? Have you heard much about Malone? They were suggested to me as well
Never heard of Malone funny enough. Regarding RG, they have done a couple Turbo E36s so it’s somewhat similar. (At least it’s a BMW straight 6)
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The combustion chamber of M20 head has too many water jacket around it and not enough of a material to hold it in place. Once it warms-up really good it "moves" and it cant hold the HG anymore. This is not a problem at all for stock engine, but start adding boost and it becomes critical. So back in the days it was either welding the jackets for adding strength to this area or go 0-ring. I have tried all combos of o-ringing, but it didnt work for me. After a few laps on the track the gasket will find a way to move. Only after I switched to cutring my problems were solved.
If your tune is fairly conservative and you dont do long pulls o-ring may work for you.
Bump to an old post just to get some more opinions
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Capital Driving Club Car # 102
How to turbo your car:
Step one. Install ecu and learn to tune and or have it tuned.
Step two. Install injectors and retune.
Step three. Install turbo parts and bits. get it running with out leaks. DO NOT DRIVE IT. Idling should be ok
Step four. Retune car
Step five enjoy
I had worked with cometic motorcycle gaskets and they are indeed just some 3 or 4 metal shims, however I just received my 0,140" MLS gasket for my S38 and it has a thick (around 3mm) metal shim between 3 or four metal shims.
Is this the same arrangement as the M50 0,140" gaskets? I wasn't expecting this at all. I though I would get heaps of layers...
So after a retune, apparently this is all I could get away with before it knocks. ~7.5* at 11psi (~175kpa)
I think something is way off. Either the mechanical timing doesn’t match Megasquirt even thought he confirmed timing, or the timing is so low that the egts are making it knock.
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Also I’m now running a 280/274 cam
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What do the plugs say
Showing slight signs of detonation. Im not sure if the knock is after tuning it or from before/during tuning. Ive got some new ones coming though.
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Also, I checked the timing yesterday. Mechanical timing is good, but it seems that Megasquirt is about 4 degrees retarded compared to true timing
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How do you like it so far? I read mixed opinions and want some first Hand experiences before ordering it
Is your ex. mani too restrictive? And what Kind of spark plugs? maybe the are too hot, causing the knock?
1982 E21 323i
M50B25 Turbo
Borg Warner S362 SX-E
ECU Master Emu
Mani is fine, spark plugs are NGK BPR7s
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Interestingly enough, I checked an old map from my friends old 2.9L M20 stroker we built and I ended up almost exactly with the same ign. advance under boost (within 1-1.5 deg of yours) over all.
The car made about 500whp on pump and methanol on a JB 6262 at that time (2012)...
But I'll be honest, the best thing I ever did was convince him to throw that dinosaur in the trash and move to the 24V.
Seems low I agree. Maybe it's the cam. My buddy was running a Schrick 288 I believe at the time.
I don't remember having ign. values that low with the stock 885 cam... when I have some time to dig through some older logs/maps from when it was just a stock M20 with headstuds around 400whp I can let you know.
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