smokemup

iTrader: (6)

Isn't this Patrick G's dyno sheet? I thought he also changed from a 75mm MAF to an 85mm MAF for that dyno test.

sditch

Tony,

Is this true that a TB was also changed? What were the mods on the car?

Tony Mamo @ AFR

iTrader: (13)

Smokem...

You are correct and I apologize that I hadn't mentioned that....to be honest its been so long I completely forgot. That gragh came to mind purely because it was a perfect example of how a properly modified FAST can not only bring big peak gains to the table but also enhance the bottom of the curve where a stock unmodified FAST really falls short.

Also, to be fair, at the low 400 RWHP level, I would be surprised if the larger MAF was even worth 3 HP and the gains would purely be at the top of the curve. Even at close to 500 RWHP the larger MAF might only be worth 3-5 HP but if your going to the dyno anyway, for the dollars invested a larger MAF still certainly makes a lot of sense. Ive also seen threads where the gains from a larger MAF have almost been negligable (perhaps tune related).

Either way though I should have provided that info with the dyno gragh....

Tony M.

j4nash

iTrader: (2)

what is the hp tq difference between the 78mm ls6 intake and the 78mm FAST intake?

Tony Mamo @ AFR

iTrader: (13)

Slight loss of low RPM power (below 3500)....about an 8-12 gain upstairs starting from around 5500 all the way to redline (obviously tune and combination dependent). Add 3-5 HP for an unported 90 mm version (and larger TB obviously)....identical curve at the lower RPM's.

Tony M.

AFRLS1

iTrader: (14)

interesting info

OJmobileII

iTrader: (3)

for comparisons between:
Ported FAST 90/90
Ported LS2

will the particular set-up have a big effect on the gains? for some set-ups would one intake be better suited? or would the difference in set-ups jus be negligible?

Ported FAST Price = 3/2 Ported LS2 Price

it seems like many people r not disputing the FAST having better gains than the LS2, but they r wondering if the gains justify the overwhelming increase in price.

i feel like maybe on an aggressive set-up 500+whp the Ported FAST is well worth the xtra price, but maybe for the concervative setups 400whp the Ported LS2 would be dramitically better than the LS6 and almost as good as the Ported FAST. so for the price the Ported LS2 is a better option for those individuals.

LS1FIRE

iTrader: (1)

What is needed to run the LS2 intake? Also what TB should be used? Is the LS2 Tb electronical?

Thanks

VINCE

iTrader: (1)

I would take the LS2 intake. The price is cheaper and low/midrange is better for a street car. If I were going all out racing then I would get the FAST..

j4nash

iTrader: (2)

so the gain between a LS6 and a 78mm fast is very small. so for the money the LS6 is the way to go?

j4nash

iTrader: (2)

anyone have some dyno numbers for, ls6 vs. 78mm FAST?

Blown04Z06

thanks to this thread, i contacted dave and picked up his DTP stage 2 cam and his ported fast 90, for way less than i thought it would be. dave my car should be done this friday, once it is ill send you the dyno results. i decided to get the LS2 tb ported by mark shanner from www.s2performance.net he lives 10 minutes from me, figured id give the ported fast its full potential.

the only down side is i ran out of money and im going to be reusing the stock exhaust system w/corsa cat back.

Patrick G

iTrader: (14)

You'll have to do a search for 3 years ago when the 78mm FAST first came out. Most of the 78mm FAST setups gained little to no power over the LS6 intakes. It wasn't until the 90mm FAST came out that you started seeing BIG gains.

Blown04Z06

there is a magazine article GM high perfromance tech(?) where there is a comparison LS1/LS6/Fast78 then they added comp cams into the mix there really wasnt a difference between LS6 vs fast 78

OJmobileII

iTrader: (3)

someone asked a question in the external section and it got me thinkin about this thread again. so i searched for it, found it, and now am bumping it after 2 months...

has anyone had a chance to do a true comparison test of ported LS2 vs ported FAST 90? same day, car, etc? i know Tony Mamo was talking about posting if he had a chance, but i havent seen it if he has.

i see LS2 intakes still going for less than LS6's and prices seem to be continuously dropping. this makes me think they are garbage and i should stop looking at them. but i still wonder how it compares to FAST (and y not an LS6 too) on a cam only or mild H/C car (something jus over 400whp)???

Tony Mamo @ AFR

iTrader: (13)

I'm hitting the engine dyno in early January with a 403 I expect to make about 600 or so with one of my ported FAST pieces....if someone wants to loan me a ported LS2 I would be more than happy to swap it right on the dyno. I am going to swap a stock LS2 intake if I can get my hands on one....at least that was the plan and I think there is a good chance of that happening.

Tony M.

bad95killer

Hopefully someone give ya a hand in this then make a damn fair comparison but i still have a feeling that the ported FAST intake gonna slightly edged out the Ported LS2

Good luck Tony .

peace

OJmobileII

iTrader: (3)

i have no doubt the ported FAST will edge out the ported LS2. i am concerned with by how much...

Justin00SS

iTrader: (5)

Now I'm interested in this. lol

Where can I get an LS2 intake? haha

Does the LS2 intake use the stock LS1/6 fuel rails?

OJmobileII

iTrader: (3)

different fuel rails and injectors. i'm sure u can modify it to accept ur existing rails.