LS2 intake + boost...

Reply Subscribe

Thread Tools

Search this Thread

May 11, 2006 | 07:33 PM

chriswtx

Thread Starter

Le Mans Master

Joined: Feb 2002

Posts: 5,970

Likes: 20

From: San Marcos Texas

LS2 intake + boost...

been thinking of switching to an LS2 intake(port matching it) and LS2 90mm throttle body when I build my new motor.. Wonder how that will do with boost compared to an LS6 intake and stock 78mm throttle body ....Anyone tried it???

May 11, 2006 | 08:32 PM

mdhmi

Team Owner

Joined: Jul 2003

Posts: 20,474

Likes: 2

From: Detroit

I know RoadRebel and Torxilla had good results with the LS2 intake manifold and TB. I'm sure there are others as well.

Mark

May 11, 2006 | 11:28 PM

glennd

Pro

Joined: Feb 2005

Posts: 652

Likes: 16

From: Upton MA

I have done that exact test. I did the change over without taking the car off the dyno. I compared a stock LS6 manifold and stock TB, compared to an LS2 with a 90mm. The results were about a 10 ft/lb advantage LS6 at below 5000rpm and an advantage of about an equal amount above 6000RPM to the LS2 90mm TB. If you send me an email I will forward the scanned graph. If you would like to post it that is fine with me. I do not know how to post the scanned graph. These graphs were off my D1SC 346" @ about 14Lbs, 700rwhp

May 12, 2006 | 01:00 AM

mdhmi

Team Owner

Joined: Jul 2003

Posts: 20,474

Likes: 2

From: Detroit

Did I read that right? You lost 10 hp across the board?

How high were you spinning the motor on the dyno?

Mark

May 12, 2006 | 10:14 AM

glennd

Pro

Joined: Feb 2005

Posts: 652

Likes: 16

From: Upton MA

Maybe, I was not clear. If I knew how, I would post the scanned dyno sheet. The LS6 stock manifold on reworked LS6 heads produced a maximun of 10 ft/lbs more power below the 5000rpm range. The LS2 manifold with a 90mm was about equal from 5K to 6K rpm's The LS2 from 6k to 6.7K picked up about 8 ft/lbs (10hp) over the LS6 with stock TB.
I hope this clarifies it for you.