going FAST w/ cam only
going FAST w/ cam only I'm going with a fairly big cam 231/237. Not nearly the biggest though. lol
Would a Fast 78/90 ported give me some good gains? I know about the price.
Also isn't the only difference between the two the top shell?
Would a Fast 78/90 ported give me some good gains? I know about the price.
Also isn't the only difference between the two the top shell?
some people say "spend the money elsewhere", but if you got the cash might as well.. you can always use that intake in the future, lets say if you go with a bigger cubed motor.. im using a 232/234 with a 90/90. BUT, i do have ls6 heads... but go 90mm if you do get it
HYPOTHETICALLY-----
if you were to get the FAST 90 right now, you would perhaps gain 20 hp.
if you got the FAST 90 after getting new heads, you would perhaps gain 40 hp.
thats why people say they arent worth the money without heads, because they have higher gains if the motor is more modified. however the same thing is true about any performance part. imagine putting an airlid on if you already had 700 hp. you might gain 100 hp just from a lid!
but you certainly not losing any hp, so go for it.
if you were to get the FAST 90 right now, you would perhaps gain 20 hp.
if you got the FAST 90 after getting new heads, you would perhaps gain 40 hp.
thats why people say they arent worth the money without heads, because they have higher gains if the motor is more modified. however the same thing is true about any performance part. imagine putting an airlid on if you already had 700 hp. you might gain 100 hp just from a lid!
but you certainly not losing any hp, so go for it.
I gained power and torque at EVERY rpms from 3K up so I would venture to say it's not going to hurt your low end at all. I'm 99% sure the only difference is the upper shell and the fact that you need a 90mm TB to take advantage of the 90mm shell. On my 233/239 (similar to your 231/237) I gained 29 RWHP and around 24 RWTQ but that was with an UD pulley, port matched FAST, and some tuning changes...it's worth it.
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Good gains! 
Originally Posted by Red99TA
I gained power and torque at EVERY rpms from 3K up so I would venture to say it's not going to hurt your low end at all. I'm 99% sure the only difference is the upper shell and the fact that you need a 90mm TB to take advantage of the 90mm shell. On my 233/239 (similar to your 231/237) I gained 29 RWHP and around 24 RWTQ but that was with an UD pulley, port matched FAST, and some tuning changes...it's worth it.
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Originally Posted by 3.4camaro
HYPOTHETICALLY-----
if you were to get the FAST 90 right now, you would perhaps gain 20 hp.
if you got the FAST 90 after getting new heads, you would perhaps gain 40 hp.
thats why people say they arent worth the money without heads, because they have higher gains if the motor is more modified. however the same thing is true about any performance part. imagine putting an airlid on if you already had 700 hp. you might gain 100 hp just from a lid!
but you certainly not losing any hp, so go for it.
if you were to get the FAST 90 right now, you would perhaps gain 20 hp.
if you got the FAST 90 after getting new heads, you would perhaps gain 40 hp.
thats why people say they arent worth the money without heads, because they have higher gains if the motor is more modified. however the same thing is true about any performance part. imagine putting an airlid on if you already had 700 hp. you might gain 100 hp just from a lid!
but you certainly not losing any hp, so go for it.
What this guy said.......sort of...............but without the ridiculously exagerated numbers.
Probably pick some hp up top and through the midrange...may some down low. But good mod for future growth none the less
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Joined: Jun 2005
Posts: 2,660
Likes: 14
From: England
Originally Posted by Justin00SS
I'm going with a fairly big cam 231/237. Not nearly the biggest though. lol
Would a Fast 78/90 ported give me some good gains? I know about the price.
Also isn't the only difference between the two the top shell?
Would a Fast 78/90 ported give me some good gains? I know about the price.
Also isn't the only difference between the two the top shell?
Most of the gains will be in the higher rpms from 4500 upwards, but most notiable will be past 5500rpm so if you up your rpm limit you'll see even better gains.
I also doubt very much you'll loose any low end grunt. It's one of these things people on the net spew about (but only by people who don't have a FAST 90).
Personally I've never seen such results and everytime someone says you'll loose low end torque I've asked if they can provide some proof. After 10-12 times of asking and no one providing anything I don't even bother anymore.
I had monster gains going 78/78. A 90/90 probably would have suited me better with my stroker cam grind of 244/248 with ported/milled heads. I broke 420rwhp with the FAST intake and ported throttle body, whereas on my LS1 intake and stock TB I was at 394rwhp. It made a difference on the Dyno, but it isn't anything that I can "feel" anywhere other than past 4800 or so...and it is very brief from that point till the rev limiter at 6600.
Joined: Apr 2006
Posts: 3,891
Likes: 1,137
From: Grand Rapids, Michigan
I'm getting a fast 78MM/ Ported TB this weekend for a song 
Even after I switch to a 90MM upper shell eventually, I'll still have WAY less in this combo than if I had purchased it new. I honestly don't think the 78MM is that bad, considering that my friend who is selling it to me has run 11.17@120 with it at full weight in a 2000 Formula. That's with only stage 1 ported heads and a cam of about 232/236 duration. He's only switching to a 90/90 because he's trying to run a 10.99 and wants all the extra he can get.
Oh yeah, you can use stock rails, but the FAST rails look WAY better
Even after I switch to a 90MM upper shell eventually, I'll still have WAY less in this combo than if I had purchased it new. I honestly don't think the 78MM is that bad, considering that my friend who is selling it to me has run 11.17@120 with it at full weight in a 2000 Formula. That's with only stage 1 ported heads and a cam of about 232/236 duration. He's only switching to a 90/90 because he's trying to run a 10.99 and wants all the extra he can get.Oh yeah, you can use stock rails, but the FAST rails look WAY better
Originally Posted by 300bhp/ton
Yes you'll see good gains over a LS6 intake, don't bother with the 78 go FAST 90 with either a NW or PTM 90mm TB.
Most of the gains will be in the higher rpms from 4500 upwards, but most notiable will be past 5500rpm so if you up your rpm limit you'll see even better gains.
I also doubt very much you'll loose any low end grunt. It's one of these things people on the net spew about (but only by people who don't have a FAST 90).
Personally I've never seen such results and everytime someone says you'll loose low end torque I've asked if they can provide some proof. After 10-12 times of asking and no one providing anything I don't even bother anymore.
Most of the gains will be in the higher rpms from 4500 upwards, but most notiable will be past 5500rpm so if you up your rpm limit you'll see even better gains.
I also doubt very much you'll loose any low end grunt. It's one of these things people on the net spew about (but only by people who don't have a FAST 90).
Personally I've never seen such results and everytime someone says you'll loose low end torque I've asked if they can provide some proof. After 10-12 times of asking and no one providing anything I don't even bother anymore.
Either way I am a big advocate of the Fast 90....I think that it is a must.
The fast 90 is mean for bigger cube motors than stock 346. Yes, many have not lost low-end supposedly, but usually to gain a little on the top end, you have to sacrifice the low-end a little. Proof is an example of what happened to by bud's 348ci A4- switch to fast and the low-end lost a lot, once past 3000rpms it made power, but below that it was lacking in comparision to the proven LS6. Yes, for an M6 looking to gain every ounce of power, the fast 90 is a must, but I just don't see all that cash for the possibility of losing low-end power for a street car.