Would a FAST intake do anything for me??
One thing I will say is that you definitely need to budget for a tune with the Fast and make sure your tuner is a good one who will take the time to help you get it right.
It might not be as bad with other brand TB, but my Fast 90mm has been and still is a huge tuning headache for idle.
I never had a ls6 intake, I went from a ls1 to a Fast 90mm that I did basic porting on. There was a very noticeable difference in throttle response and some mid range, but over 4000rpm is where it really shines. I'm not saying it's a bad mod, but if you don't get deals it can be pricey and it comes with headaches. Based on my dyno numbers and track numbers, I picked up roughly 20hp over the ls1 intake feeding a reverse split 230/224 cam that peaked around 5800-6000rpm.
It might not be as bad with other brand TB, but my Fast 90mm has been and still is a huge tuning headache for idle.
I never had a ls6 intake, I went from a ls1 to a Fast 90mm that I did basic porting on. There was a very noticeable difference in throttle response and some mid range, but over 4000rpm is where it really shines. I'm not saying it's a bad mod, but if you don't get deals it can be pricey and it comes with headaches. Based on my dyno numbers and track numbers, I picked up roughly 20hp over the ls1 intake feeding a reverse split 230/224 cam that peaked around 5800-6000rpm.
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Thanks Thunder. I've been doing some googling and found one guy over on cadillac form did a fast 90 on his cts and actually lost power over the ls6 which I didnt think was right. Then I found a 92mm done on a stock 04 ls6 long block with manifolds on it no less and he picked up13 peak and about 13/8 all the way through the curve.
Lastly was an ls2 which I know is a 6.0 but also has a smaller cam and crappy intake and he base lined 338. After lt's and a fast he put down 385 and another guy with the same mods got 400 even on the same dyno.
This probably wont go down till summer but its something I'm going to strat saving for. Probably do a 90/90 or 92/90. The fast 90 and 92 are the same exact intake and runner design just different openings right?? I'm down in south florida and lashway initially tuned the car so I get a good break if I bring it back to them and Eric/josh are both standup guys who do a lot of tuning on H/C cars so I'm sure it'll be ok lol
Lastly was an ls2 which I know is a 6.0 but also has a smaller cam and crappy intake and he base lined 338. After lt's and a fast he put down 385 and another guy with the same mods got 400 even on the same dyno.
This probably wont go down till summer but its something I'm going to strat saving for. Probably do a 90/90 or 92/90. The fast 90 and 92 are the same exact intake and runner design just different openings right?? I'm down in south florida and lashway initially tuned the car so I get a good break if I bring it back to them and Eric/josh are both standup guys who do a lot of tuning on H/C cars so I'm sure it'll be ok lol
My 90mm tb was no problem on the idle. The 102 was pina. It was a cheap 102 of ebay with that funky lip before the throttle blade. I cut that out as it made tip in seem starved. I then figured the iac could not adjust because even shut it would idle. This told me the throttle blade was leaking to much air around it so I epoxyed the back of the bottom and front of the top to seal it. Sanded it up to where it's just barely there and now the iac does it's job.
My 90mm Fast brand is a **** poor waste of ~$200 (used).
The blade was dragging handing on the body when I got it, but it only did it when torqued on the intake which meant taking it off and on a lot to get it to stop doing that.
From there it kept giving me fits alternating between running and choking out which I finally found was the set screw for the blade backing out.
I'm not sure what other items are causing the problems, but compared to tuning my roommates cammed Trans Am which took very little to get perfect (took me 2 tries), I have flashed my car with over 30 different idle tunes and as of yesterday has finally balanced between surging coming down to idle and not running around town in "cruise control" mode. I am a tuning noob, but I would still expect the tuner needs some patience to make the car happy and not give up or assume there is a vacuum leak or something.
It does look pretty under the hood though...painted anyway, stock the light gray looks like ****.
The blade was dragging handing on the body when I got it, but it only did it when torqued on the intake which meant taking it off and on a lot to get it to stop doing that.
From there it kept giving me fits alternating between running and choking out which I finally found was the set screw for the blade backing out.
I'm not sure what other items are causing the problems, but compared to tuning my roommates cammed Trans Am which took very little to get perfect (took me 2 tries), I have flashed my car with over 30 different idle tunes and as of yesterday has finally balanced between surging coming down to idle and not running around town in "cruise control" mode. I am a tuning noob, but I would still expect the tuner needs some patience to make the car happy and not give up or assume there is a vacuum leak or something.
It does look pretty under the hood though...painted anyway, stock the light gray looks like ****.
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oh ya if I do it im def shying away from ebay or a fast 90 tb. I posted this thread up on the cadillac forums and every reply I've got there says that on a stock motor they have lost torque and only gained a couple up top? This doesnt seem right, especially on the dyno threads i've seen. I mean the longer runners of the fast I think would help torque if anything.
What size cam do you have? I had a Futral Motorsports F11(228/230 .576/.595 114 lsa) when it was stock cubes but once I forged it and stroked it I went a lot bigger. When it was cam only on stock cubes it made 392 then the intake swap took it to 424.
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Regarding the EWP, right now I don't want to pull the trigger on the $800 for the extra 10hp. So I installed the $25 relay kit and it is pre-wired and ready to go, and I figure if my water pump starts leaking or fails I will upgrade then. I want to buy the Fast intake first
If you can find a good deal on one then do it. I just got a Fast 90/90 for 400.00 plus my stock intake/tb. To me it was a no brainer. The LS6 intake is a fine intake but the guy I got my 90/90 off of he had the fastest bolt on C5. It was full bolt ons with 90/90 and 1 7/8 LT's and a Auto. It made 365rwhp and ran a 10.8 @ 124.
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Been doing some searching over the week and I think when I find a good deal I'm gonna pop on one. Just a couple quick questions and thoughts. I have hp tuners at my disposal is the fast some easily tuned for on my own or should I let the dyno shop take care of that?
Also it seems the consensus is the fast is worth 10-14rwhp over an ls6 on a bolt on car... But I found this guy who had a cts-v in the thread here who actually lost a lot under the curve in trade for a few up top.To me this doesn't seem right as I'd think the velocity of the ported fast as well as the long runners would help power everywhere. Any thoughts guys?
https://ls1tech.com/forums/showthread.php?p=9057384
Also it seems the consensus is the fast is worth 10-14rwhp over an ls6 on a bolt on car... But I found this guy who had a cts-v in the thread here who actually lost a lot under the curve in trade for a few up top.To me this doesn't seem right as I'd think the velocity of the ported fast as well as the long runners would help power everywhere. Any thoughts guys?
https://ls1tech.com/forums/showthread.php?p=9057384
There's an old thread on here where Tony Mamo talks about how the FAST 78 is under rated because everyone thinks the 90/92 is better. Do a search on it before everyone says don't waste your time with a 78.
It's the intake design that has more to do with the amount of power you make than the hole up front. That's why people don't pick up that much power going from a 92mm TB to a 102 mm TB on a FAST 102 intake.
It's the intake design that has more to do with the amount of power you make than the hole up front. That's why people don't pick up that much power going from a 92mm TB to a 102 mm TB on a FAST 102 intake.
I've built both my ws6 and my c5 frc like you, go ***** out in bolt ons. I installed a FAST 78 on my c5 and I've liked it so far, decent little throttle response, if you can buy it with little money on your end after selling the ls6 I'd do it.
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hp tuners will work great for tuning.when buying a 90mm+ TB avoid the old fast TB with the bad springs.use the ls1 intake bolts on the fast intake.use the correct valley pan bolts for a fast intake swap.make sure your PCV is working .
Remove the pvc system would be best.
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There's an old thread on here where Tony Mamo talks about how the FAST 78 is under rated because everyone thinks the 90/92 is better. Do a search on it before everyone says don't waste your time with a 78.
It's the intake design that has more to do with the amount of power you make than the hole up front. That's why people don't pick up that much power going from a 92mm TB to a 102 mm TB on a FAST 102 intake.
It's the intake design that has more to do with the amount of power you make than the hole up front. That's why people don't pick up that much power going from a 92mm TB to a 102 mm TB on a FAST 102 intake.
I tried that for a while and just didn't like how I had oil under my hood after DD'ing it a while with the breather. I'm running and Elite Egn catch can now with the ls6 valley and my intake is bone dry after 10k lol.
Anyone have any thoughts on why that cts-v lost power? Maybe it was just the black sheep of the herd, although I saw a guy here who lost trap speed at the track though I dont think he was tuned. i just dont want to go backwards by adding this setup and be out a lot of $$.
Doug, do you have the graph of before and after the fast? Also does anyone have any tuning tricks to get the car to idle well with hptuners? When I do it I'll probably have to wait a week or so to get it on the dyno so I want to just tune the idle so I can still drive around.
Dan-
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and also does anyone know of a difference between a fast 90 and 92? I have seen a lot fo people say its just the 2mm opening but then I see some people say its a newer design than the 90 and will make more power?
I don't think there is any difference other than the size of the opening. 2mm wont' mean much. As far as the pvc goes I just have filters on my valve covers w/o any oil issue. I have seen others have that issue though.
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as fate would have it browsing corvetteforum a guy had a like new fast 92 ported by vengeance with all stainless hardware for a stupid price. so I am now a broke college student once again but I do own a nice FAST 92 lol looking at a ptm tb later on as they seem to be close so a NW but much cheaper. any other recommendations for a budget tb
