Z06Vette.com - Corvette Z06 Forum

michael02z06 · 11-30-2005, 07:30 PM

I just got a 90mm nick williams throttle body. I was going to buy an ls2 intake and get it ported. I was told by a few people that the ls2 ported will perform the same as the fast. Now some people are telling me it would be a step backwards. Do any of you have a ported ls2 intake on?? there is a guy on ls1 tech that ports them and he has a dyno difference from the fast and ls2. check out the site below and let me know what you guys think. i was just wanting to go ls2 because it would save me a lot of cash.

http://www.ls1tech.com/forums/showth...ght=ls2+intake

THRLSKR · 12-02-2005, 06:48 AM

Can't go wrong with a FAST 90 especially if you do some port work to smooth out the rough spots...I find it hard to believe the LS2 intake flows anywhere close to a ported/unported FAST.

My TSP Magic Stick Z06 made 450RWHP with the FAST and some other go-fast goodies on a very conservative tune...and this was with stock 243 Z06 heads!

Bill

sreker · 12-02-2005, 09:21 AM

Bill, which TB did you decide to go with? How difficult was the tune? I'm trying to decide!

THRLSKR · 12-05-2005, 09:48 AM

Went with the Nick Williams TB - ECS put a great tune on it with no driveability problems with the big cam.

**IVOZ06** · 12-05-2005, 10:43 AM

Go with the FAST 90, it will out perform the LS2.

I also went with the LS2 Throttle Body.

I had an Aftermarket TB and had high idle issues.

Since I put the LS2 TB on her, all issues are gone.

Tony Mamo · 12-05-2005, 11:36 AM

IMO, a FAST has some inherent advantages over an LS2 (runner cross section, plenum volume, slightly superior radiused entrance to each runner etc.), and a properly modified (ported FAST) has even more. Might a well prepared LS2 give a stock FAST a run for it's money.....perhaps, but compare two ported units and I would put my money on the FAST. Don't forget it was designed with performance in mind right from it's inception, where a stock piece (the LS2/LS6) has alot of other considerations in its original design intent.

Just my .02....

Tony M.

Rage · 12-05-2005, 11:48 AM

Are you guys porting your FAST yourselves or are you having it done?

marco383 · 12-05-2005, 02:55 PM

I just installed a FAST manifold with an LS2 TB on my 427 and picked up only 15 RWHP over a ported LS6/78mm combo. Pretty pricey power.

Lawdogg · 12-05-2005, 03:05 PM

I'm familiar with a World Challenge engine builder that tested a World Challenge LS2 motor on his engine dyno and said the LS2 intake manifold caused a number of cylinders to run as lean as 18 to 1 at wot. He used 02 sensors on each individual exhaust runner to test the a/f ratio.