FAST 92 hp gain?
Thread Starter
10 Second Club
Joined: Jan 2010
Posts: 2,317
Likes: 20
From: Hurley, VA
FAST 92 hp gain? I'm running a sbe ls1. Torquer v2 PRC 215s ls6 intake 1 7/8 headers and 4" exhaust. I'm about to have the car tuned but I'm toying with the idea of getting a fast 92 for it I just hate to drop 1200 bucks on it and pick up maybe 10hp. This car will be my daily not really a track car. Would it be worth the swap ?
Well you kind of answered your own question when you said you'd hate to spend $1200 and get only maybe 10 hp, because thats about what you'd gain lol. The reason I did it was because I wanted to squeeze every bit out that I could
With heads and that cam I think 10 is very low. I'd venture 15-20 is about what it would really be and possible more if the intake was ported. Also if you sold your ls6 intake the cost would be much less, if you bought the stuff used it would be even less
I used to think 15-20 with a 90 or 92 as well until I saw a buddy of mine gain 11 rwhp on his cammed ls1. This was on the same dyno about 2 weeks apart.
This ^^^ I'd expect a solid 30hp maybe more with a ported FAST 92/92 on your setup. Every time I see a ls6 intake anymore I just think about the easy power being left on the table. Literally no downside to a FAST 92 on an fbody besides the price. I'm sure Vengeance Racing will have there ported FAST deal for black friday. Might want check them out.
I gained 20 rwhp when I did mine. Mine was ported and port matched...but at the time I only had 1 3/4" headers. You also need to do everything forward of the new intake to get good results. Tb, bellows, lid, maf etc.
Staging Lane
Joined: Nov 2005
Posts: 65
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From: Brazoria, Texas
Depends on how much the ls6 is choking power now. For me, on my heads and cammed ls1 the ls6 was fine. When I went to my 383 and my power went above 450 Hp (about the limits of the ls6 before it becomes the choking point) and couldn't keep up anymore and the fast92 gained me 21hp and about 17lbs. I did do a back to back comparison with my new 402 as we both (me and a friend) wanted to know just how much it was giving me over a ls6 because he is going back and forth about getting one. On my new 402 it was a lot more power. The ls6 power was 481hp and with the fast 92 it went up to 511 hp. Will everyone gain the same? NO, again it depends on how bad your motor is being choked up by the ls6. I was always told under 450 hp ls6 is fine above that and you will gain a good amount going with the fast. Yes you will gain going from a fast92 over a ls6 even in a stock motor but would it be worth it hummm not in my eyes which is why I waited to get mine until I was over the 450hp mark. Good luck man
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That's true. Need an 85mm maf and harness. I shoved the stock bellow over the throttle body.
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I will say this....when I switched to the Fast 92 the car was noticeably stronger in the mid range and seemed to flow more smoothly if that makes sense. Kind of like when when you open up the exhaust...you feel the car climbing more effortlessly and smoothly. Maybe I gained power on the dyno and maybe I didn't, but I definitely noticed this on the street. Thought it was worth mentioning
Thread Starter
10 Second Club
Joined: Jan 2010
Posts: 2,317
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From: Hurley, VA
I've always wondered if most of the big gains from the fast 92 intakes cam from a lot of build up in the original ls6s. I know on my own ls6 with maybe 70k on it and a catch can being ran along with it I had a crazy amount of build up in the runners and intake. Mine came off my 02 trans am that's on the camaro now and it was absolutely caked with dried/wet oil. They were a puddle in the back of the intake and I had to wire brush the runners to get all the build up out. I may go ahead and bite the bullet on it and order it.
Had a ls1 intake. Rebuilt engine (LS1) and went with ls6 intake. I bought it used but cleaned it inside and out perfect. Put a couple hundred miles on it and went to the track. All mph were around 118. Went with a fast 92 setup, 85mm maf, changed slp lid to ftp lid and retune. First tune was fat. Went back to track and have been running around 123. No crazy difference in density altitude. Have ported 806 heads and a smaller cam than you. I'd expect your setup to pick up pretty good.
