Fast92 vs ported LS6 advice?
Thread Starter
Melting Slicks
Joined: Nov 2006
Posts: 2,361
Likes: 51
From: Dallas Texas
St. Jude Donor '08
Fast92 vs ported LS6 advice?
Hey,
I am building my motor and have everything set but now debating about the intake. Could you guys let me know the postitives/negatives of using a Fast92 vs a ported LS6 intake? I have heard that when you use a Fast, you will gain higher HP numbers but lose torque because of the higher flow. Is that true?
Thanks for the help...
I am building my motor and have everything set but now debating about the intake. Could you guys let me know the postitives/negatives of using a Fast92 vs a ported LS6 intake? I have heard that when you use a Fast, you will gain higher HP numbers but lose torque because of the higher flow. Is that true?
Thanks for the help...
Melting Slicks
Joined: Jul 2007
Posts: 2,052
Likes: 14
FAST is better in every way. LS6 is only available in 75 (78?) mm tb anyway, so spend the money on a FAST 92 but don't forget to get it ported as well.
TPIS had a 90mm LS6 but I am not sure if they make them anymore. Ported FAST is the way to go.
First search on Google
http://forums.corvetteforum.com/c5-t...omparison.html
TPIS had a 90mm LS6 but I am not sure if they make them anymore. Ported FAST is the way to go.
First search on Google
http://forums.corvetteforum.com/c5-t...omparison.html
Safety Car
Joined: Aug 2006
Posts: 4,206
Likes: 6
From: Makena, Maui & NM
Hey, I am building my motor and have everything set but now debating about the intake. Could you guys let me know the postitives/negatives of using a Fast92 vs a ported LS6 intake? I have heard that when you use a Fast, you will gain higher HP numbers but lose torque because of the higher flow. Is that true? Thanks for the help...
http://forums.corvetteforum.com/c6-t...e-options.html
The OP was asking about the difference between a ported LS6 and an unported Fast 92. In this case, the Fast is not better in every way and in fact, is on a par with the LS6. btw-TPIS still makes a 90MM LS6 mod and is still a popular item for them.
Last edited by siffert; Feb 27, 2009 at 11:36 PM.
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
C5 tech section posts have shown time and time again that the midband gains of the FAST far outperform the ported stock manifolds including the LS6 and LS2.
The very first ported FAST I prepped was for my C5 and the ported LS6 on it was 22rwtq less between 3500 and 5500rpm.
If anyone thinks their ported LS6 or LS2 can beat my FAST simply get it installed and I will transplant on a fully prepped FAST and tune it on a dyno. If it isnt better I will replace the original. If mine hammers it by at least 15/15 under the curve, you have to buy it and pay for the install/tune.
No LS6 is bettered the results.
The very first ported FAST I prepped was for my C5 and the ported LS6 on it was 22rwtq less between 3500 and 5500rpm.
If anyone thinks their ported LS6 or LS2 can beat my FAST simply get it installed and I will transplant on a fully prepped FAST and tune it on a dyno. If it isnt better I will replace the original. If mine hammers it by at least 15/15 under the curve, you have to buy it and pay for the install/tune.
No LS6 is bettered the results.
Advanced
Joined: Jul 2007
Posts: 63
Likes: 31
From: Fairfield California
Spin modified and ported my Fast92 which I had installed last weekend, all I can tell you is this by far the best seat of the pants modification I've made so far. I have an 05 A4 with a few bolt on mods and prior to the installation of the SpinFast intake I put down 362rwhp on the dyno, and now I'm itching to get back on the dyno because I can certainly feel I've made substantial top end and mid range gains in horsepower and torque.
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Melting Slicks
Joined: Jul 2007
Posts: 2,052
Likes: 14
I have a ported and TPIS 90mm modded LS2 Intake coming in to me. From everything I have researched, it is at least on par with a unported Fast 92 if not better. Not to mention you do not have to cut into your firewall using a LS6, unlike the standard Fast 92. Now a Ported Fast 92 is better than than the ported LS6, but of course, we are talking double the money too.
http://forums.corvetteforum.com/c6-t...e-options.html
The OP was asking about the difference between a ported LS6 and an unported Fast 92. In this case, the Fast is not better in every way and in fact, is on a par with the LS6. btw-TPIS still makes a 90MM LS6 mod and is still a popular item for them.
http://forums.corvetteforum.com/c6-t...e-options.html
The OP was asking about the difference between a ported LS6 and an unported Fast 92. In this case, the Fast is not better in every way and in fact, is on a par with the LS6. btw-TPIS still makes a 90MM LS6 mod and is still a popular item for them.He was looking for pros and cons of FAST over ported LS6. Does a FAST lose torque. No.
Pro - Ported FAST is better
Con - Ported FAST is more $$
End of story.
I will never understand tyring to save $500 when modding a $50K car when it will only cost you power in the long run. Good luck
Last edited by JayplaySS2; Feb 28, 2009 at 12:04 PM.
Melting Slicks
Joined: Jul 2007
Posts: 2,052
Likes: 14
C5 tech section posts have shown time and time again that the midband gains of the FAST far outperform the ported stock manifolds including the LS6 and LS2.
The very first ported FAST I prepped was for my C5 and the ported LS6 on it was 22rwtq less between 3500 and 5500rpm.
If anyone thinks their ported LS6 or LS2 can beat my FAST simply get it installed and I will transplant on a fully prepped FAST and tune it on a dyno. If it isnt better I will replace the original. If mine hammers it by at least 15/15 under the curve, you have to buy it and pay for the install/tune.
No LS6 is bettered the results.
The very first ported FAST I prepped was for my C5 and the ported LS6 on it was 22rwtq less between 3500 and 5500rpm.
If anyone thinks their ported LS6 or LS2 can beat my FAST simply get it installed and I will transplant on a fully prepped FAST and tune it on a dyno. If it isnt better I will replace the original. If mine hammers it by at least 15/15 under the curve, you have to buy it and pay for the install/tune.
No LS6 is bettered the results.
Spin, your confidence in your work is amazing. I have no idea why you are not over on Tech more often?
Safety Car
Joined: Aug 2006
Posts: 4,206
Likes: 6
From: Makena, Maui & NM
Who is trying to save money? I could be driving a Ferrari 599 if I wanted to. So far as the long run goes, my run is over for adding bolt-ons to my car. If I was adding heads and cam et al, I might see your point..but I am not. Some people are happy with talking up dyno numbers, I prefer the walk the talk ET numbers...which are few and far between to find just for intake manifolds. Thus, am going to find out for myself which is the better performing manifold. Incidentally, what intake manifold do you currently have on your car? A Fast?
Last edited by siffert; Feb 28, 2009 at 01:25 PM.
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
Incidentally, what manifold do you have on your car? Stock? You plug every manifold other than the FAST and you never tried the FAST or any other. As soon as you read about some obscure manifold you jump on a FAST thread and talk about its gains.
You can yap about what works when you actually get one and have factual gains....dyno or track. What dyno results do you have? Now dyno results dont matter so what track results do you have for anything other than stock? You do a lot of talking for a guy that has zero data points.
Now your favorite is the prepped LS6.
You can yap about what works when you actually get one and have factual gains....dyno or track. What dyno results do you have? Now dyno results dont matter so what track results do you have for anything other than stock? You do a lot of talking for a guy that has zero data points.
Now your favorite is the prepped LS6.
Last edited by SpinMonster; Feb 28, 2009 at 04:37 PM.
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
Anyone wanting to have a stock manifold (LS1, LS2, LS6, L76, LS3, LS7) ported, I charge 160 with return shipping and they see about 9-11rwhp at peak without the FAST's midband results which in some areas are 3 times as great.
For $160 its a great bang for the buck.
TB's are 75 with return shipping included.
For $160 its a great bang for the buck.
TB's are 75 with return shipping included.
Last edited by SpinMonster; Feb 28, 2009 at 04:31 PM.
Melting Slicks
Joined: Jul 2007
Posts: 2,052
Likes: 14
Who is trying to save money? I could be driving a Ferrari 599 if I wanted to. So far as the long run goes, my run is over for adding bolt-ons to my car. If I was adding heads and cam et al, I might see your point..but I am not. Some people are happy with talking up dyno numbers, I prefer the walk the talk ET numbers...which are few and far between to find just for intake manifolds. Thus, am going to find out for myself which is the better performing manifold. Incidentally, what intake manifold do you currently have on your car? A Fast?
The way you mentioned the ported FAST was twice the price indicated to me that you were tyring to get as much performance as possible with the least price. $830 for the FAST and $330 for Spin to port/mod it is not alot of money.
I actually run a Ported LS2 on my H/C C6 until Tuesday when I will be installing my Spin FAST. I could care less about dyno's as well but I'm confident a FAST in going to help getting 130+ mph traps more than the LS2 or the a TPIS 90 LS6. The TPIS is not cheap either, $500 core unless you have an LS6 and then another $350 to port.
I'm not going to argue about it, hell who knows, maybe you find what youre looking for with the LS6. If so, great.
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
You have to pay to post services on these forums. There is a monthly charge to be a supporting tuner or vendor and it isnt cheap. I raise money for St Judes here and it pays the fee. I have enough work.
Safety Car
Joined: Aug 2006
Posts: 4,206
Likes: 6
From: Makena, Maui & NM
Incidentally, what manifold do you have on your car? Stock? You plug every manifold other than the FAST and you never tried the FAST or any other. As soon as you read about some obscure manifold you jump on a FAST thread and talk about its gains.
You can yap about what works when you actually get one and have factual gains....dyno or track. What dyno results do you have? Now dyno results dont matter so what track results do you have for anything other than stock? You do a lot of talking for a guy that has zero data points.
Now your favorite is the prepped LS6.
You can yap about what works when you actually get one and have factual gains....dyno or track. What dyno results do you have? Now dyno results dont matter so what track results do you have for anything other than stock? You do a lot of talking for a guy that has zero data points.
Now your favorite is the prepped LS6.
Au contraire, I had a ported LS2 intake and it did not do much of anything. About -.03 gain for me. Sold that on CF (you can check that too) and now back to stock. Got a LS6 TPIS 90MM modded and ported coming into me soon as well as a used Spinwoohoo Fast 90 coming in any day now too. There is indeed a vibrant market of used Fast 90/92's and SpinFast 90/92's. So its not like everybody is holding on to them for dear life, like those who do for gold bullion.
Since you think you are a guy with all the data points, surely you must have some dyno results between a ported & modded (ala Spin) Fast with bolt-on install vs a ported Fast only (ala Cartek, Formato et al ) with a cut firewall install? I wonder how much power is lost in the cutting up of the Fast itself for the C6 LS2 application. I heard something is lost, how much I dont know.
Last edited by siffert; Mar 1, 2009 at 12:48 AM.
Safety Car
Joined: Aug 2006
Posts: 4,206
Likes: 6
From: Makena, Maui & NM
$830 for the FAST and $330 for Spin to port/mod it is not alot of money. I actually run a Ported LS2 on my H/C C6 until Tuesday when I will be installing my Spin FAST. I could care less about dyno's as well but I'm confident a FAST in going to help getting 130+ mph traps more than the LS2 or the a TPIS 90 LS6. The TPIS is not cheap either, $500 core unless you have an LS6 and then another $350 to port. I'm not going to argue about it, hell who knows, maybe you find what youre looking for with the LS6. If so, great.
I already had a LS6 intake, so I avoided the core charge. Its $300 for the TPIS 90MM replacement surgery and another $200 for porting the manifold. We'll see. Good luck to you too.
