Cam only with ported FAST 92
Did you read any of my posts at all? Judging by your post it doesn't look like it. Also, who said I had a stock bottom end? No offense but if I wanted advice on my setup I would ask. I posted this for information.
Guys...
I ported this intake based on it being bolted on a set of higher flowing aftermarket heads later. The opening of the intake is now larger than the heads a slight bit but more importantly, a ported FAST (or even a stock FAST) has to be on a really honking set of heads to be especially effective. The bottom line is a stock intake can somewhat keep up with a factory set of heads but cant keep up with an AFR/TFS/ETP, etc. and thats when you see big gains with the manifold swap. (The key is the intake has to represent a large restriction to see big gains when swapping to a higher flowing ported FAST....with stock LS1 heads (230 CFM or so), the heads themselves are more restrictive than the intake, or certainly close, so swapping something in front of them that flows more is of mininal benefit).
The OP knew all this going in and in fact I told him not to look for any more than 8-10 HP. It would have made a few more had I not opened up the exits at all but that would have hurt his numbers later when he finally bolts a deeper breathing new set of lungs on his engine so obviously that wouldnt have been a good move long term and I ported it now assuming a larger port entrance down the road a ways.
I was pleased that there was no loss on the bottom....a stock FAST on this combo most certainly would have given up some down low as you have seen in other comparisons.
-Tony
I ported this intake based on it being bolted on a set of higher flowing aftermarket heads later. The opening of the intake is now larger than the heads a slight bit but more importantly, a ported FAST (or even a stock FAST) has to be on a really honking set of heads to be especially effective. The bottom line is a stock intake can somewhat keep up with a factory set of heads but cant keep up with an AFR/TFS/ETP, etc. and thats when you see big gains with the manifold swap. (The key is the intake has to represent a large restriction to see big gains when swapping to a higher flowing ported FAST....with stock LS1 heads (230 CFM or so), the heads themselves are more restrictive than the intake, or certainly close, so swapping something in front of them that flows more is of mininal benefit).
The OP knew all this going in and in fact I told him not to look for any more than 8-10 HP. It would have made a few more had I not opened up the exits at all but that would have hurt his numbers later when he finally bolts a deeper breathing new set of lungs on his engine so obviously that wouldnt have been a good move long term and I ported it now assuming a larger port entrance down the road a ways.
I was pleased that there was no loss on the bottom....a stock FAST on this combo most certainly would have given up some down low as you have seen in other comparisons.
-Tony
Last edited by Tony Mamo @ AFR; Dec 30, 2008 at 11:41 PM.
very cool.
i'm doing a similar before/after comparison in feb.
i've got it lined up to have the tune touched up with the current ls6 intake, dyno it, then swap the ported FAST 90/90 and retune...and re-dyno.
this will be on a stock heads, cam only setup.
not expecting huge gains, but these mods are in preparation for heads down the road.
and considering the deal i got on the FAST 90/90 the cost isn't too bad either. particularly when i sell the ls6 and ported tb for $400 or so.
thanks for these numbers, and keep an eye out for my comparison.
i'm doing a similar before/after comparison in feb.
i've got it lined up to have the tune touched up with the current ls6 intake, dyno it, then swap the ported FAST 90/90 and retune...and re-dyno.
this will be on a stock heads, cam only setup.
not expecting huge gains, but these mods are in preparation for heads down the road.
and considering the deal i got on the FAST 90/90 the cost isn't too bad either. particularly when i sell the ls6 and ported tb for $400 or so.
thanks for these numbers, and keep an eye out for my comparison.
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I think its a great gain considering what the set-up is. This provides good info for the guys who plan on being cam-only and looking to gain anything they can. Like Mamo said, not only did it gain considerable on the top end, but it lost nothing down low.
Do you have track times and MPH to compare the old and the new? That is what I would be interested in seeing.
Do you have track times and MPH to compare the old and the new? That is what I would be interested in seeing.
