Pretty happy with how my car's looking now. Hate to say it, but I think I'm actually finished modifying my car...for now haha.
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Clean shaved/tucked M20 turbo - TUNED 378hp/282kw
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Originally posted by ForcedFirebird View PostThe pressure you need to reduce is between the turbo and head, not after the turbine unfortunately. You should be able to just bolt on a larger housing, just match the trim. Garret offers several, listed right on the product page for the gt35.
Your turbo ratio would be more suited to a high HP small displacement engine (ie, high intake flow, small exhaust in NA form, such as a Honda etc.).Originally posted by wazzu70 View PostThe problem is you are running a larger turbo at minimum capacity. One 44mm gate is not big enough to bypass all the exhaust volume you need to barely work the turbo. You can add another wastegate, increase wastegate size, or run a boost pressure thats in the operating range of the turbo!
Originally posted by downforce22 View PostI have the same manifold on a 3.1L stroker m20 and i have some boost creep also. good to hear I'm not the only one. I thought increasing boost pressure might help it. I have a 6 psi spring and creep up to 9 psi. turbo is a precision 5862, wastegate tial mvr 44 mm
Local is using the RSI manifold with a 6267 BB t4 .6 housing, and it was perfectly stable down to 6psi for street driving with a 44mm gate. Made 518+@19psi when it got the wick turned up. Granted a t3 .8 housing would have spooled earlier, its a good demonstration of the housing size vs pressure release.
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Originally posted by potatomash View PostPretty happy with how my car's looking now. Hate to say it, but I think I'm actually finished modifying my car...for now haha.
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Originally posted by ForcedFirebird View PostLooks great! What diff are you using?
What difference would I see with a lower one??
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Originally posted by ForcedFirebird View PostI said the same earlier int he thread.
Turbo specs?
Local is using the RSI manifold with a 6267 BB t4 .6 housing, and it was perfectly stable down to 6psi for street driving with a 44mm gate. Made 518+@19psi when it got the wick turned up. Granted a t3 .8 housing would have spooled earlier, its a good demonstration of the housing size vs pressure release.
Precision PTE 5862
Compressor 58.00 76.20
Turbine 71.00 61.90
Journal Bearing
T3 0.82 AR, 3 inch V-band Exhaust
4 Inch inlet P-Trim Anti Surcge Compressor Housing, 3.5" outlet
My engine is a 3.1L M20 (86 x 89.6 mm) with 9.5:1 CR and stock 885 head, cams, valves with G&T manifold and 44 mm Tial MV-R gate dumping to atmospheric screamer pipe. I assumed it was the size of the engine turning a smaller compressor, but it looks like match bot shows a 38 mm wastegate to be adequate. you can see it clearly on my logs
Wastegate was opening at 2600 rpm and run stops at 4300 rpm in 4th or 5th gear.
I just have what came with it, which is 3.91 LSD. It seemed good as far as I thought apart from 1st gear which is useless..but I've never been in any other turbo e30s so have nothing to compare to
What difference would I see with a lower one??
Look at this video and compare the pull in second gear at 0:13 to the one in 3rd gear at 1:35
318iS Track Rat :nice: www.drive4corners.com
'86 325iX 3.1 Stroker Turbo '86 S38B36 325
No one makes this car anymore. The government won't allow them, normal people won't buy them. So it's up to us: the freaks, the weirdos, the informed. To buy them, to appreciate them, and most importantly, to drive them.
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