gearheads78

iTrader: (29)

Just curious if anyone out there has tested the gains they made with just going to a FAST 90 over a LS6 with no other changes in a already healthy H/C stock cube car. Also the same question going from Jet Hot headers to some 1 7/8 or 1 3/4 to 1 7/8 stepped headers .

My car runs OK now but I think there is a bottle neck somewhere. How much is the LS6 or my Jethots really holding me back.

marv

iTrader: (40)

Good thread man, I'm debating the same thing.

I'm interested to see what responses you get.

FWIW, I've heard from friends, that the FAST 90/90 setup was good for about 12hp over the LS6...for $1200. This was on a 447 rwhp H/C car. Pretty healthy...got 470 rwhp or so before he tuned it back a bit.

If you could find one used, the gain vs. money wouldn't be that bad, but at $1200 for new, it gets rough.

Louie83

iTrader: (3)

I've seen 25-30 rwhp gain with ported 90/90 over LS6. If you're gonna spend the money, it is worth the extra 500 or so to have it ported considering you gain twice as much.

marv

iTrader: (40)

Newb question for you Louie...

If I bought a FAST intake and wanted it ported to the heads I have on the car now, is the only option to pull the heads and send them to the porter? I don't see any other way that they could port them to match the heads without them.

Or could they do it with port measurements and volume?

Maybe I'm just *over thinking* this...help me out.


I know if I could get 25-30 rwhp just with a FAST 90 and port matching, I'd probably jump all over it.

gearheads78

iTrader: (29)

Yea I am still stuck in traditional carbed V8 thinking. I built everything else in this TA on a shoestring but price vs return on the next step is hard to swallow.
Right now its making apox 390 RWHP though a 12 bolt, TH400 / 4000 TCi converter unlocked. At 3600 lbs race weight it ran a 7.29 @ 95.6 with 1.61 60ft 2nd time out on 275-50-15 drag radials. I think I can get mid 1.5x with a little suspension tunning but I think if I don't upgrade my intake and possibly headers I may be close to maxed out on power.

marv

iTrader: (40)

Back to the top...I want to hear some hard numbers from you guys...

If I could get 15-20 rwhp from a FAST 90, I might be tempted to get one.

Gear those are good numbers btw...

bandit1

iTrader: (12)

Well check out my thread that says WOW on here I am a H/c car and added the 90/90 and right now you can get it from tsp as a combo new for 1075 shipped. Heck of a deal and I ported mine and can only really say DAM or WOW the throttle response, the power, and even the low end torque which i figured would drop went UP!! If you have an LS6 I just sold a new 1 I had bought before I knew that my 02 already came with one and the old one on the for sale section for $300 so really its pretty good deal if you got the LS6 cause you spend 1075 then get 300 back and if you want my uncle to port it he'll do it for $100 cause hes retired and nothing but time on his hands. I will have hard numbers to see what i acually gained this sat after the dyno day. I was at 411 at the rears

gearheads78

iTrader: (29)

Please post up as soon as you have concrete numbers or track times to back up your SOP feeling. I would be very curious to know the results.