Fast 92 vs 102
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Joined: Mar 2012
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From: South Florida
Fast 92 vs 102 Just thought I'd post this cool article I came across. I don't know what the first dyno chart is for. Enjoy.
http://onthedyno.com/GM-LS-motor/art...92-vs-102-402/
http://onthedyno.com/GM-LS-motor/art...92-vs-102-402/
So going off this test basically even on a big stroker motor the difference is only 7 hp. Then it would stand to reason the gains would be even less on a 346 with similar mods. To me the "best" Fast intake is the one I can for an awesome price used. If I could've found a 102 for a smoking deal then great, but it just so happened to be a 90.
Good article
Good article
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Joined: Jul 2012
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not really surprising if you look a the flow numbers between the various types of intakes. Its only marginally better between the fast 102 and 92... What i think might help the 102 the most is the ability to mate it to a really big TB and matching CAI so the airflow is uniform and there is no venturi effect going on
Thread Starter
11 Second Club
Joined: Mar 2012
Posts: 1,541
Likes: 15
From: South Florida
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Thread Starter
11 Second Club
Joined: Mar 2012
Posts: 1,541
Likes: 15
From: South Florida
Here's the article from the first graph. Nice gains. http://onthedyno.com/GM-LS-motor/art...k-vs-fast-383/
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We still need a better intake. I just flowed a FAST 102 on 243 heads I just finished porting that go 335cfm at .600 at 28"on a SF600. The bench we tested the manifold on (SF110) would only go to 7" but the head still flowed 316cfm at .600. With the FAST on there it only flowed 284cfm. I will say it was a bunch better than the stock LS2 I ported that went 274 on the same port. It sucks that even at only 7" of depression we are still loosing over 30cfm. I will have to test it with the next set of heads I port at 28" and see what happens.
We still need a better intake. I just flowed a FAST 102 on 243 heads I just finished porting that go 335cfm at .600 at 28"on a SF600. The bench we tested the manifold on (SF110) would only go to 7" but the head still flowed 316cfm at .600. With the FAST on there it only flowed 284cfm. I will say it was a bunch better than the stock LS2 I ported that went 274 on the same port. It sucks that even at only 7" of depression we are still loosing over 30cfm. I will have to test it with the next set of heads I port at 28" and see what happens.
..........INT...EXH
.100.....74.....64
.200...150....129
.300...227....170
.400...280....200
.500...320....219
.600...333....225
.650...330....230
The FAST loses a lot of air through it's multiple runner design. I was noticing how much it was losing as I was playing with my tune and was talking to some other folks about this. Apparently, it's a pretty big issue with the runners letting air reversion happen back into the plenum. I bet if you could seal up the internal tubes or sonic weld them or something, you'd gain 10-15cfm or so. The design is solid, but the build quality is not.
I may do a bit of testing with my theory and do some back-to-back dyno runs to see if it makes any difference. If it's more than 10cfm difference it should show up on the dyno.
I may do a bit of testing with my theory and do some back-to-back dyno runs to see if it makes any difference. If it's more than 10cfm difference it should show up on the dyno.
No problem. They are 799's off my 07' CTSV. I have Ferrea 2.04" intake valves and stock 1.55" exhaust valves. I am posting the average numbers for four intake ports and exhaust ports. They were all +/- 5cfm throughout the range when I was done. I have to pay $30 every time I use the SF 600 flow bench so after $200 for testing and all the driving I got all the ports as close as I could and stopped. I have had five sets of aftermarket CNC heads on this bench and they all flowed within a couple cfm of advertised. I only made one original cut on the exhaust and just duplicated it. I didn't have time to work on that side of the head much. I have to get the car back together this weekend. I will say that there is a ton more to the valve job and combustion chamber than I originally paid credence to. Needles to say I will be buying my own seat cutters very soon since I want to have complete control of angles and margins with the next set I do. I have to thank Martin@Tick, Brian Tooley, and Chris Frank for the knowledge, help and motivation. I am building my Flow bench next week that will flow 28" of depression and give me legit CFM numbers. I have a set of 243's here that I am going to do for a local guy. I am going to keep the runner as small as possible and use the stock valves. These heads took forever and a ton of development so I am not sure if I would take the time and effort again to duplicate them.
..........INT...EXH
.100.....74.....64
.200...150....129
.300...227....170
.400...280....200
.500...320....219
.600...333....225
.650...330....230
..........INT...EXH
.100.....74.....64
.200...150....129
.300...227....170
.400...280....200
.500...320....219
.600...333....225
.650...330....230
Pop over .25 L/D looks excellent as well. They should make big power!
Thanks for the nudge when I was in the corner crying. Not sure about the big power yet though. LS2 intake and dead stock 2.5" back from the cats is going to shatter any dreams I have for this motor. Eventually it will rock.