Pulley size - boost
Thread Starter
Racer
Joined: Mar 2011
Posts: 347
Likes: 15
Pulley size - boost
SO,
I have a stoc LS2 with headers and exhaust.
I'm building a supercharger setup with a V-3 SCi, A&A bracket, A&A intake, 60lb injectors, custom intercooler setup, meth (just for cooling and safety).
The blower comes with 3.8" pulley. What boost should I expect ?
What the highest boost I can run on the stoc LS2 safe with 95 fuel ? What pulley do I need for this ?
Do I need a boost a pump ?
Thanks,
Mihai
I have a stoc LS2 with headers and exhaust.
I'm building a supercharger setup with a V-3 SCi, A&A bracket, A&A intake, 60lb injectors, custom intercooler setup, meth (just for cooling and safety).
The blower comes with 3.8" pulley. What boost should I expect ?
What the highest boost I can run on the stoc LS2 safe with 95 fuel ? What pulley do I need for this ?
Do I need a boost a pump ?
Thanks,
Mihai
Le Mans Master
Joined: Jun 2004
Posts: 6,164
Likes: 103
Drifting
Joined: Apr 2008
Posts: 1,840
Likes: 3
From: halton region Ontario
i ran 20 lbs of boost into my LS2 short for 3 years of severe abuse until last fall.....baaaaaaaaboom.
a qualified tune and meth & you should be good....especially with 95.
not sure what boost you will have....14.
have fun.
Instructor
Joined: Dec 2008
Posts: 112
Likes: 0
From: San Marcos CA
Mine was reading the same on the guage. We hooked it up on a mainline dyno and it was reading 8.5 on a 3.8 DIA pulley. A&A said for every .2 you go down you get roughly 2lbs.
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Le Mans Master
Joined: Dec 2007
Posts: 8,375
Likes: 97
From: Somewhere in the Mid 9's TX
With 95 octane+meth, I would go with a 3.4-3.6 pulley.
With the stock balancer(close to 7.5 inches), and the SI having a 3.60 step up ratio(I believe)
3.4 pulley at 6800rpms=54,000rpms on the head unit
3.6 pulley at 6800rpms=51,000rpms on the head unit
The SI is rated at 52,000rpms, but you won't pass that for just a split second if you bounch of the limiter at 6800rpms, and I wouldn't worry about it. 95 Octane would be awesome to have locally! With that and meth, you should be fine on a good tune. On 91, with no meth, I'd keep the 3.8. Good luck.
