I'm reluctant to post this as I'm a little disappointed in the numbers, but I've never been one to get caught up on dyno numbers. I do however like to know my money spent was worth while and honestly thought I'd see more gain than 1hp! It actually lost 1ft/lb, but the curves overlayed look identical, never varying more than a couple either way and the peaks are at the same rpm? SOTP it felt similar to when the heads were ported and it gained 30rwhp then. I'm hoping the dyno was out of calibration or something, since the shop I've been using from the beginning just recently moved. Hopefully the track numbers will tell a different story this weekend...I know my cam isn't big enough to really take advantage of the intake, but it sure feels faster. Maybe my butt-meter is out of calibration as I'd been up for 24hrs when we finished it up. Afterwards, I did run my buddies 408 auto c5 that's turned 10.6@126 and "only" lost to him by 2 cars from 40-120, which he said was about the as same when he ran against a 470rwhp lg cammed ls3 c6...figured I'd share, any thoughts?
Yes we street tuned it after the install, granted the pulls were from different days too. I'm hoping it gains a couple mph and is enough to push it into the tens, will know tomorrow night possibly. It'd be nice to trap as fast as your bolton c5z Gary
Track the true test of your modding results And we all like to see dyno results though too so I hear you on that one. If the car feels better then hopefully it is. If you lost to your buddy by approx 2 car lengths is about 2-3mph difference. From my findings. It doesnt come down to ET for roll races as it does HP/TQ resulting in MPH.
Yes we street tuned it after the install, granted the pulls were from different days too. I'm hoping it gains a couple mph and is enough to push it into the tens, will know tomorrow night possibly. It'd be nice to trap as fast as your bolton c5z Gary
Not using the same dyno for the before & after makes it difficult to compare results. If you take some time to compare several dyno runs & the results to both the dyno's you may be able to draw some conclusions that are useful.
The dyno results aside you can safely believe your SOTP meter assuming your Fast 90 was done properly.
You don't need a cam to see big results, head over to the C6 Tech section & search, you will find it is not uncommon to have similar gains with a ported Fast 90 as Long-tube headers. Many stock before & after dyno runs are posted there.
I have noticed the manifold really starts to flow @ 4000 rpm & requires tuning to compensate, the tuning required is adding fuel. Commonsense is that when adding fuel you are making more power.
You can always reveiw your tuning & see what the changes were.
I'm reluctant to post this as I'm a little disappointed in the numbers, but I've never been one to get caught up on dyno numbers. I do however like to know my money spent was worth while and honestly thought I'd see more gain than 1hp! It actually lost 1ft/lb, but the curves overlayed look identical, never varying more than a couple either way and the peaks are at the same rpm? SOTP it felt similar to when the heads were ported and it gained 30rwhp then. I'm hoping the dyno was out of calibration or something, since the shop I've been using from the beginning just recently moved. Hopefully the track numbers will tell a different story this weekend...I know my cam isn't big enough to really take advantage of the intake, but it sure feels faster. Maybe my butt-meter is out of calibration as I'd been up for 24hrs when we finished it up. Afterwards, I did run my buddies 408 auto c5 that's turned 10.6@126 and "only" lost to him by 2 cars from 40-120, which he said was about the as same when he ran against a 470rwhp lg cammed ls3 c6...figured I'd share, any thoughts?
Take it to the track and find out. If you didn't run it on the same dyno then the differences could be attributed to that. It would have helped if you did a before run on the same dyno to put things into perspective.
Location: Springfield, NJ Raceway Park & Atco Raceway
I'm surprised no one has asked this yet (or maybe everyone already knows) as it is somewhat important but what intake manifold was on there before the FAST, an LS1 intake or LS6? Ported or untouched?
Stock 75-78mm throttle body or ported/polished?
I'm assuming that it was an LS6 as the gains from going to a FAST over an LS1 intake, even if measured on separate dynos, would have to be quite substantial.
Thanks Gary, I'm definitely "in the zone", all I can hear is the engine revving and if I close my eyes I see the tach needle swinging lol. The weather is supposed to be in the 40's tomorrow night(should be -DA) and I'm gonna see what she'll do. Ya got any last minute tips? Already got her ready to rock-n-roll tonite(drag pack loaded/passenger seat out/clutch fluid swapped) gonna head out as soon as I wake up tomorrow afternoon, if I can sleep at all! My left foot and right arm have been simultaneously twitching in my sleep, is that normal?
I'm surprised no one has asked this yet (or maybe everyone already knows) as it is somewhat important but what intake manifold was on there before the FAST, an LS1 intake or LS6? Ported or untouched?
Stock 75-78mm throttle body or ported/polished?
I'm assuming that it was an LS6 as the gains from going to a FAST over an LS1 intake, even if measured on separate dynos, would have to be quite substantial.
To clarify things, I previously had a stock/unported ls1 throttle body and ls6 intake. It was done on the same dyno, the shop just changed locations, but being that it was done on different days and there are so many variables. I'll report back with the track results, it faired pretty well I feel against another 10sec car, so we'll find out if it has enough beans tomorrow night...
Not using the same dyno for the before & after makes it difficult to compare results. If you take some time to compare several dyno runs & the results to both the dyno's you may be able to draw some conclusions that are useful.
The dyno results aside you can safely believe your SOTP meter assuming your Fast 90 was done properly.
You don't need a cam to see big results, head over to the C6 Tech section & search, you will find it is not uncommon to have similar gains with a ported Fast 90 as Long-tube headers. Many stock before & after dyno runs are posted there.
I have noticed the manifold really starts to flow @ 4000 rpm & requires tuning to compensate, the tuning required is adding fuel. Commonsense is that when adding fuel you are making more power.
You can always reveiw your tuning & see what the changes were.
It made 426/383...I've read many of the gains on an ls2, but that intake isn't even as good as the ls6. I agree more fuel needed usually equals more power. We threw 3% at it initially, which I'm suprised the stock injectors aren't maxed, to make sure it wasn't running lean then backed it off from there. WOT manifold pressure was 98kpa which I thought was strong.
Chris, good luck at the track! Hope the intake shows its gains at the track. Are the storms going to be out of the area by tom? We are still getting pounded down here.
Thanks Mark, me too! It came down heavy last night, but has already started clearing up here with the front pushing thru. My buddy with the c5z is out of town, but I have another friend with an h/c frc with a ls7 clutch that'll be running. I know you already installed the spec, but I'll still let you know his results if ya want. I saw your results(5500rpm!) what was your 60'? The drivetrain is gonna get shocked harder with a grabbier clutch, what psi in the tires and were you slipping it?
Thanks Mark, me too! It came down heavy last night, but has already started clearing up here with the front pushing thru. My buddy with the c5z is out of town, but I have another friend with an h/c frc with a ls7 clutch that'll be running. I know you already installed the spec, but I'll still let you know his results if ya want. I saw your results(5500rpm!) what was your 60'? The drivetrain is gonna get shocked harder with a grabbier clutch, what psi in the tires and were you slipping it?
Thanks, Chris. I don't want to get your thread sidetracked. I ran a 7.67 at 95+mph in Houston of Friday with great air. 60 ft was decent with a 1.817 on the 18 inch drag radials.
On saturday at Lone Star in Sealy, I could only go high high 7.7's in the 1/8 mile, trap speed was down 2 mph, but I attribute this to extremely intense wheel hop, as I posted on your wall, and no cool down and higher DA. My 60 ft was in the 1.83-1.85 area. With my power, and the 18 inch drag radials, I should have been in the mid 1.7's both nights. Just need more strip time in a c5 with IRS.
Again, thanks for the help, please let me know how it goes on my wall. You have a stout FRC, I would like to keep this thread about your car.
Mark
Last edited by winters97gt; 10-30-2009 at 03:57 AM.
Appreciate the concern, but I know you can't PM and we are still talking about racing vettes, plus I started this thread. I had an IRS in my mustang and the steeda pinion bushings helped wheelhop, but obviously the c5 isn't the same...just stepped outside and it's raining again, dang I feel like I'm in Seattle or London. This has to be the wettest fall here ever, may have to wait till Sun to run.
Thanks Gary, I'm definitely "in the zone", all I can hear is the engine revving and if I close my eyes I see the tach needle swinging lol. The weather is supposed to be in the 40's tomorrow night(should be -DA) and I'm gonna see what she'll do. Ya got any last minute tips? Already got her ready to rock-n-roll tonite(drag pack loaded/passenger seat out/clutch fluid swapped) gonna head out as soon as I wake up tomorrow afternoon, if I can sleep at all! My left foot and right arm have been simultaneously twitching in my sleep, is that normal?
You have enough power to run the number. Pull your front swaybar if have not already. Focus on your launch. You will want to cut a high 1.4x to a very low 1.5x 60'. Hit your shift points. (You will probably go through the traps at 6900 rpm. Check your rev limiter.) Most important, never, ever give up.
Good luck.
As for the twitching, it's not normal unless you have epileptic convulsions.
It made 426/383...I've read many of the gains on an ls2, but that intake isn't even as good as the ls6. I agree more fuel needed usually equals more power. We threw 3% at it initially, which I'm suprised the stock injectors aren't maxed, to make sure it wasn't running lean then backed it off from there. WOT manifold pressure was 98kpa which I thought was strong.
426/383 and you're saying you're running with 470rwhp LS3s???
Who ported your fast? The results even with a smaller cam should definitely be noticeable. Obviously the largest gains are with the addition of good heads, but I'd with the same dyno I'd expect around 12-15rwhp.
426/383 and you're saying you're running with 470rwhp LS3s???
The weight to avg power ratio is what defines acceleration, you can't just dyno race and compare peak numbers. He's stock geared, heavier and I might be a better driver , but I didn't actually run him (my buddies 408 put ~the same distance between him and me he said) Shaner did the port work, check new post for results
Corvette Store
ported fast 90 results...
