GT2860rs vs GT3071r vs GT3582r
Joined: Jun 2006
Posts: 29,085
Total Cats: 375
From: Republic of Dallas
My car on 8.5:1 compression with a log manifold on a GT2860rs .86, and you need to shift the RPM peak torque about 500rpm sooner. The wheel speed function on the dyno wasn't perfect.
After 16psi this turbo started to run out of gas. With a tubular manifold, its a different game and it makes the same numbers at 12psi but hits 16psi at 3400rpm.
lowered static compression sucks at 12psi:
but at 15 (actually 13 and up) the glory of MBT of timing comes through from 4000-redline, and the #'s jump dramatically:
AFR:
advancing timing at 15psi did no good, lol.
my uneducated, misinformed theory:
The gt2860rs "works" and stops overboosting after 13psi.
Lowered static compression "is beneficial" after 13psi or about 220whp (dynodynamics, higher on a dynojet).
but at 15 (actually 13 and up) the glory of MBT of timing comes through from 4000-redline, and the #'s jump dramatically:
AFR:
advancing timing at 15psi did no good, lol.
my uneducated, misinformed theory:
The gt2860rs "works" and stops overboosting after 13psi.
Lowered static compression "is beneficial" after 13psi or about 220whp (dynodynamics, higher on a dynojet).
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Edit: Where did he find it that cheap?
Last edited by sixshooter; Oct 18, 2010 at 03:48 PM.
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Not new news. Different wheel design, like an 11-blade compressor wheel like my Duramax has or something. 10% more flow for the same spoolup. Have they actually announced a GTX30R yet? I thought it was only available in a 40 or a 42 and up.
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Don't bother putting a big TB on the stock IM, you need to change the IM (unless you have an '02 "squaretop" manifold).
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speedf50
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