SoFla01SSLookinstok

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/

HCI2000SS

iTrader: (2)

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

Goosecaddy05

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

newchevyman

iTrader: (15)

The first dyno peaked at 5500. Second peaked at 6400. There is something wrong there.

scotty2000ss

iTrader: (2)

Can't wait to see real world results with the new MSD intake.

SoFla01SSLookinstok

The comparison between Fast intakes is the second graph. The first graph is a truck intake comparison or something.

HioSSilver

iTrader: (8)

Good info.....i would like to know more about that 1st graph.

SoFla01SSLookinstok

Here's the article from the first graph. Nice gains. http://onthedyno.com/GM-LS-motor/art...k-vs-fast-383/

HioSSilver

iTrader: (8)

Thanks for linking that second one

Pray

iTrader: (7)

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.

LT194CamaroZ

iTrader: (15)

How about some more info on those 243s you ported, those numbers are considerably better than all the high dollar cnc programs out there.

Pray

iTrader: (7)

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

JakeFusion

iTrader: (7)

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.

Pray

iTrader: (7)

I was having a similar issue with the stock LS2. I had to go in as far as possible with each runner and seal op the gaps.

JakeFusion

iTrader: (7)

Well the nice thing about the FAST is you can get in and work with it.

Sales@Tick

iTrader: (3)

You did the hard work, I just stood back and played engineer lol.

Pop over .25 L/D looks excellent as well. They should make big power!

Pray

iTrader: (7)

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.