Turbo Spooling #'s!!
wouldnt opening it result in less pressure causing the turbos to have a slower spool time? it makes sense getting more power but can anyone explain the faster spool time yall are talking about? i dont understand that one bit
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From: Kennesaw, Georgia
Originally Posted by Bullet_WS6
wouldnt opening it result in less pressure causing the turbos to have a slower spool time? it makes sense getting more power but can anyone explain the faster spool time yall are talking about? i dont understand that one bit
Originally Posted by HUNTER02SS
I think it is the back pressure of the exhaust that keep's the turbo's from spooling quicker? Eliminate the back pressuer and it will spool quicker. On race car's they have a really short down pipe for this reason.Try this. Blow through a small diameter straw and then through a larger one. The larger one was easier to blow through because of the bigger diameter and easier to get the air through. Same principle on the exhaust.Either a bigger diameter pipe or just open it up all the way.The spooling effect come's from the exhaust of the engine and therefore when it is plugged up by a restrictive exhaust it cannot spool as quick as when it is opened up. Hope this help's!
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From: Kennesaw, Georgia
Originally Posted by Bullet_WS6
see it makes sense in my head but in my last car i had that was turbo... i would dump the downpipe and then put a test pipe on to connect the rest of the exhaust an to me it seemed way more responsive with exhaust hooked up... thats what confuses me
Originally Posted by HUNTER02SS
The spooling also has alot to do with turbo size and engine combo. my turbo's are a little big for my motor,I think, and so it with the full exhaust it would spool up around 3800-400rpm. I can already tell that it is spooling sooner and alot quicker with the cutout's.Alot of variance's with this stuff.
i blew both headgaskets first pass with my ofi kit...went from restrictive air filter and closed exhaust to no air filter and cutout...boost changed from 10psi to 20psi....boom!!!
My tune doesnt change as much now but i think it is because the magnaflow flows pretty decent....a/f with cutout closed and 93 is about the same as cutout opened with 110octane....the 110 runs richer and about compensates (a/f) for the cutout being opened. Now at max boost with 116, i dont think thats the case but seems to be so at 10-11psi
My tune doesnt change as much now but i think it is because the magnaflow flows pretty decent....a/f with cutout closed and 93 is about the same as cutout opened with 110octane....the 110 runs richer and about compensates (a/f) for the cutout being opened. Now at max boost with 116, i dont think thats the case but seems to be so at 10-11psi
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From: Kennesaw, Georgia
Originally Posted by cablebandit
i blew both headgaskets first pass with my ofi kit...went from restrictive air filter and closed exhaust to no air filter and cutout...boost changed from 10psi to 20psi....boom!!!
My tune doesnt change as much now but i think it is because the magnaflow flows pretty decent....a/f with cutout closed and 93 is about the same as cutout opened with 110octane....the 110 runs richer and about compensates (a/f) for the cutout being opened. Now at max boost with 116, i dont think thats the case but seems to be so at 10-11psi
My tune doesnt change as much now but i think it is because the magnaflow flows pretty decent....a/f with cutout closed and 93 is about the same as cutout opened with 110octane....the 110 runs richer and about compensates (a/f) for the cutout being opened. Now at max boost with 116, i dont think thats the case but seems to be so at 10-11psi
If I set my 2 step at 2500 I get 3psi cutout closed, 5psi open.
WOT open vs closed at 14psi the cutout needs 2% more fuel....but my exhaust is pretty open after the cutout.
WOT open vs closed at 14psi the cutout needs 2% more fuel....but my exhaust is pretty open after the cutout.
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Originally Posted by HUNTER02SS
I would of thought that your wastegate would of kept your boost at the preset psi. I wonder why it went past that?The magnaflow flow's good up to about 12psi and anymore I get the backpressure buildup.
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From: Kennesaw, Georgia
Originally Posted by cablebandit
it had a 20psi spring all along but the very restrictive air filter (430cfm) and no cutout wouldnt let it get enuff air to make more boost than 10psi
oh yeah...20psi felt SOOO much better than 10psi that i didnt let out until just before the 1/8....like a dummy. Still ran a 6.18 @ 104 in the 1/8 so I am hopeful for winter time.
Originally Posted by cablebandit
i blew both headgaskets first pass with my ofi kit...went from restrictive air filter and closed exhaust to no air filter and cutout...boost changed from 10psi to 20psi....boom!!!
Originally Posted by cablebandit
oh yeah...20psi felt SOOO much better than 10psi that i didnt let out until just before the 1/8....like a dummy. Still ran a 6.18 @ 104 in the 1/8 so I am hopeful for winter time.
Originally Posted by cablebandit
Kp, you do your stuff right and havent heard the "boom" in so long that you dont recognize it 
Actually it just laid down....no boom...i did that for effect!!!
Actually it just laid down....no boom...i did that for effect!!! 