fast 78mm setup or 90mm setup Hp increase?
Thread Starter
Racer
Joined: Nov 2005
Posts: 347
Likes: 0
From: San Diego California
fast 78mm setup or 90mm setup Hp increase?
guys, how much will the 78mm fast w/ 78mm throttle body differ from the 90/90 ls2 TB?
I have g5x3 cam setup, patriot perf stage 2 heads, un pulley, vararam intake, ud pulley, injectors.
will it really make that much of a difference to pay the $300 for the upgrade or should i stick with 78mm TB /78mm fast?
I have g5x3 cam setup, patriot perf stage 2 heads, un pulley, vararam intake, ud pulley, injectors.
will it really make that much of a difference to pay the $300 for the upgrade or should i stick with 78mm TB /78mm fast?
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
Depends on how much you are willing to pay for the extra few hp. I have spent a lot of time looking into this, and what I found was the ported version will provide the best hp all the way up the curve with no loss down low, as a matter of fact it will even gain down low. The only person who I have seen that can pull this off is Tony Mamo. His porting would likely get you at least 20 hp with your setup. The issue I have seen is where to plug in the PCV system fresh air, which the LS2 throttle body eliminates.
Safety Car
Joined: Mar 2002
Posts: 4,928
Likes: 1
Cruise-In V Veteran
St. Jude Donor '09
Originally Posted by gottiman
guys, how much will the 78mm fast w/ 78mm throttle body differ from the 90/90 ls2 TB?
I have g5x3 cam setup, patriot perf stage 2 heads, un pulley, vararam intake, ud pulley, injectors.
will it really make that much of a difference to pay the $300 for the upgrade or should i stick with 78mm TB /78mm fast?
I have g5x3 cam setup, patriot perf stage 2 heads, un pulley, vararam intake, ud pulley, injectors.
will it really make that much of a difference to pay the $300 for the upgrade or should i stick with 78mm TB /78mm fast?
20 hp gain over an LS6 - if I remember correctly.
Plug the PCV into the side of the bellows (get a longer hose and rubber grommet with plastic canula/attachment at any parts store..Pep boys etc.)
Burning Brakes
Joined: Aug 2006
Posts: 789
Likes: 38
From: Shreveport LA
Originally Posted by vettenuts
The only person who I have seen that can pull this off is Tony Mamo. His porting would likely get you at least 20 hp with your setup. The issue I have seen is where to plug in the PCV system fresh air, which the LS2 throttle body eliminates.
A little light reading.
http://www.ls1tech.com/forums/showthread.php?t=581665
Last edited by Blue02ws6; Oct 4, 2006 at 08:35 PM.
