New Idea.....Will It Ever Stop
Thread Starter
Le Mans Master
Joined: Oct 2006
Posts: 6,080
Likes: 0
From: Houston TX
New Idea.....Will It Ever Stop
The car is good with the way I have it setup, minus a turbo seal leaking.
Currently I have twin stage 5 60-1 Garrett's with a .60AR, 2.5 DP in 3. C6 Z06 cam 211/230 and .593/.588 123LSA (25.5* negative OL).
Idea:
Bigger cam with some positive OL 234/250 625/600 113LSA (16* OL)
Smaller turbos with a twist. DBB turbos with a .48AR ( I really do need a mid to small frame T3 instead of the full size I currently have )
In my twisted mind, these should be well spun up to overcome the OL barrier making them provide power sooner than my Garrett's.
Any thoughts?
As for the rest of the setup
Forged 347
10.5:1 CR
ls6 heads
60# Motrons
BAP W/ Racetronics harness
8CC valve reliefs
GM MLS head gaskets
ARP head studs
dual nozzle Meth (M15's)
Eboost2 EBC
FMIC
38mm WG with 8# spring
50mm Tial Q BOV with 12# spring
Currently I have twin stage 5 60-1 Garrett's with a .60AR, 2.5 DP in 3. C6 Z06 cam 211/230 and .593/.588 123LSA (25.5* negative OL).
Idea:
Bigger cam with some positive OL 234/250 625/600 113LSA (16* OL)
Smaller turbos with a twist. DBB turbos with a .48AR ( I really do need a mid to small frame T3 instead of the full size I currently have )
In my twisted mind, these should be well spun up to overcome the OL barrier making them provide power sooner than my Garrett's.
Any thoughts?
As for the rest of the setup
Forged 347
10.5:1 CR
ls6 heads
60# Motrons
BAP W/ Racetronics harness
8CC valve reliefs
GM MLS head gaskets
ARP head studs
dual nozzle Meth (M15's)
Eboost2 EBC
FMIC
38mm WG with 8# spring
50mm Tial Q BOV with 12# spring
Last edited by Slow Z06; Jun 27, 2010 at 12:09 PM.
Tech Contributor
Joined: Apr 2007
Posts: 10,924
Likes: 78
From: Forney Texas
The car is good with the way I have it setup, minus a turbo seal leaking.
Currently I have twin stage 5 60-1 Garrett's with a .60AR, 2.5 DP in 3. C6 Z06 cam 211/230 and .593/.588 123LSA (25.5* negative OL).
Idea:
Bigger cam with some positive OL 234/250 625/600 113LSA (16* OL)
Smaller turbos with a twist. DBB turbos with a .48AR ( I really do need a mid to small frame T3 instead of the full size I currently have )
In my twisted mind, these should be well spun up to overcome the OL barrier making them provide power sooner than my Garrett's.
Any thoughts?
Currently I have twin stage 5 60-1 Garrett's with a .60AR, 2.5 DP in 3. C6 Z06 cam 211/230 and .593/.588 123LSA (25.5* negative OL).
Idea:
Bigger cam with some positive OL 234/250 625/600 113LSA (16* OL)
Smaller turbos with a twist. DBB turbos with a .48AR ( I really do need a mid to small frame T3 instead of the full size I currently have )
In my twisted mind, these should be well spun up to overcome the OL barrier making them provide power sooner than my Garrett's.
Any thoughts?
The bigger cam with larger OL won't make more power and then adding the smaller turbos may spool easier, but the second they spool, your pressure ratio will be through the roof and you will end up with a torque curve that looks like a sine wave. Meaning you will hit your peak torque at 3800RPM and then it will fall on it's face due to back pressure and the overlap will just make it worse. A turbo system with high back pressure like that likes a reverse split cam with lower exhaust duration.
My recommendation would be to call Precision Turbo and Engineering and get a turbo with compressor maps and pressure ratios that match your engine, power and spooling desires. Go with a ball bearing turbo.
