RaNsOm

iTrader: (2)

In response to lilbuddy1587

"You dont call 15-20whp through out the curve after about 4.5k rpms and another 15 peak THAT MUCH ? Damn..I must be crazy then"

in this thread https://ls1tech.com/forums/dynamometer-results-comparisons/480398-ha-ha-ha.html

Sir, maybe you gained 20whp and 15 peak hp, but I sure as hell did not. I do not believe a FAST 90/90 makes a SIGNIFICANT difference over an LS6/ported TB combo on a cam-only car. MAYBE 10whp at the most. Heads/cam, sure, you'll start to see a change. I trapped 119-120 before, and 120 after the 90/90 install. Cant argue with results.

Discuss.

Edit: lets say a mid sized cam-only car. Im sure some of the bigger cams Trex, MS3, G5x4 cams will see slightly more of course.

gnx7

iTrader: (28)

The FAST 90/90 combo is supposed to give approx 20rwhp/10-15rwtq throughout the rpm range. If you port the intake it is supposed to be worth another 10rwhp or so. If you went with Speed Density tuning you could probably get another 10rwhp.

I'm at 439rwhp/385rwtq with AFR 205's, TSP 233/239 cam, LS6 intake/ported TB, March pulley and 1 7/8" long tube headers (average collector design on them). Just ordered a FAST 90 intake and Holley 90mm TB. Hoping for 470rwhp/405rwtq with a speed density tune. Hoping for 130+mph in the 1/4 n/a on 91 octane in daily driver tune with 346ci.

RaNsOm

iTrader: (2)

cam-only sir, cam-only.

Ksett

Please post results. I think you are setting yourself up for disappointment but I've seen crazier things happen. I do think you will see 20-22 rwhp.

raymond mckinney

iTrader: (4)

I'm hoping to see at least 20 wheel on my car for the money I'm spending!

lilbuddy1587

iTrader: (1)

Cam only car, LT's, full exhaust, fast 90/90, and a tune

You are correct on small-mid sized cams not benefiting as much from a 90/90, I was wrong there. I should have been a little more clear on what I was stating.

gnx7

iTrader: (28)

449rwhp cam only? I assume the heads were milled at least? Those numbers don't seem very typical.

Patrick G

iTrader: (14)

Stock heads don't flow that much so an LS6 intake doesn't knock down the flow numbers that much more when bolted up. What I mean is stock LS1 heads flow around 230 cfm and the LS6 intake might knock the flow down 10 cfm. A FAST intake is not going to help a lot in this application.

Well-ported heads on the other hand flow more like 300 cfm and the LS6 intake will knock down the flow into the 260 range. A FAST 90/90 will only knock it down to the 280 range. The better the heads, the more the FAST intake works. It's not really cam related. If you'd like to see where I gained 28 rwhp with the addition of a FAST 90/90, click on my signature and look for the dyno sheets.

Beast96Z

iTrader: (21)

I think your being extremley optmisitc with your supposed gains. The intake gains will be proportional to the flow of the heads. Having a professional, like Tony Mamo port it to match the AFR heads, might net you 5-10 more depending upon how much you are intake hindered. Patrick has already done the speed density thing and got 5 hp out of it. Those gains are assuming your MAF restricted. Hey, Flowmaster does claim 40 hp and 40 TQ on there crossflow mufflers though.

GrannySShifting

iTrader: (10)

aaron did you seriously put a 90/90 setup on your car?

VIPRETR2

iTrader: (63)

I gained .5mph on a TR230 car, stock heads. But I didn't have the tune redone for it and it was always a mail order. Maybe I would've picked up more but I wouldn't expect it to be alot.

Tony Mamo @ AFR

iTrader: (13)

The whole FAST 90 thing is such a funny topic IMO. Seems the people that say they don't work are usually the ones hemming and hawing about the price.

To reiterate and clarify once again....A FAST 90 install over an LS6 /stock TB combo is worth between 10 and 15 RWHP, most of the gains seen in the higher portion of the power curve. Down low (under 3500) I have seen between a slight loss (5 ft/lbs) in TQ and HP to just about the same.....meaning the lower portion of the curve is close to a "over-lay" when comparing the same combination with the LS6/stock TB set-up. Even right out of the box the FAST is simply a better designed piece (than an LS1-6) and the benefit of its design should be realized on every engine it's bolted on top of. It has better shaped runners, a better "approach" to those runners, and a larger plenum....all of which aid in it allowing more air to pass thru it....especially at higher RPM's when there is so little time to do so (much quicker valve events that happen in tiny fractions of a second).

I have personally seen these results backed up close to a dozen times and they all fall in line with what I mentioned above. Half of those times I was the guy installing and testing the intake on a particular combination. Others were tests performed by friends in the industry who's input I rely on without hesitation.

Another myth I would like to dispel (again...LOL) is the FAST is a "waste of money" unless you have a heads and cam or a more aggressive 346....Total BS
On a bonestock 346 (with an LS1 cam) I saw a clean 10-11 HP gain at the top end of the curve. Is that worth the price of admission?....It depends on how much you value those additional ten ponies.

Regarding the work I do, it is usually worth an additional 6-8 peak RWHP (in addition to the gains you would get out of the box), but you will see a much improved area under the curve with a solid 10 RWTQ gain as early as 2500 RPM's (versus a slight loss to "flat" curve with a stock out of the box unit). In fact, the area under the curve is as good a reason (if not better) to rework the manifold if you are one of those guys that want to fully optimize their combo and don't want to leave any power untapped. You can check out Patricks gragh in the link a few posts up and see the immediate gains in low speed TQ and HP on his gragh comparing the before and after FAST install. Some of his peak RWHP gains I attribute to the larger MAF install (2-4 HP) which is a nice complimenting mod to a ported FAST, both of which are essentially removing restrictions seen in "front" of the heads which reduce their effectiveness.

BTW....all of these gains assume you have tuned the car to take advantage of the newfound airflow the FAST provides. Personally, I think the guys not seeing the gains are really just needing to tune the car to take advantage of it. Some tunes might be able to get away with just dropping it on and put down the number....others might need a little tweaking.

Hope this info helps...

Tony M.

A ported stock TB will knock the net gains down 2-4 HP depending on who did the porting.....meaning the delta from the FAST install will be a little less.

steveo346

iTrader: (18)

Tony Mama is a intake god!!!

Tony Mamo @ AFR

iTrader: (13)

Tony "Mama" would be an intake God if he got an additional 20 RWHP out of a ported FAST....

gnx7

iTrader: (28)

Hmmmmmm..... I hope I gain more than 10-15rwhp with a Speed Density tune on top of the FAST 90/Holley 90mm TB. I have a fully ported stock TB already....

If not that is going to be $100/hp at this point. yikes

I hope with cleaning up any mold flashings in the FAST 90, Speed Density Tune (MAF sensor removal), 4" intake piping, to achieve 25rwhp+/15rwtq+.