FAST 90 vs 92??
Thread Starter
Melting Slicks
Joined: May 2006
Posts: 2,891
Likes: 1
From: NJ..."the way I saw it, everyone takes a beating sometimes."
FAST 90 vs 92??
Have any shops/members done any back to back testing of a FAST90 vs a FAST92? If so what was the outcome?
If tests were performed with only a FAST 92, what was the hp/tq difference compared to average FAST 90 results?
Please give detailed description of the mod set up on the car as well as ported/unported FAST.
Thanks
If tests were performed with only a FAST 92, what was the hp/tq difference compared to average FAST 90 results?
Please give detailed description of the mod set up on the car as well as ported/unported FAST.
Thanks
Melting Slicks
Joined: Sep 2007
Posts: 2,597
Likes: 3
From: READING PA
St. Jude Donor '08-'09-'10
Is a ported FAST 90 to 92 MM the same as a FAST 92 ?
Have any shops/members done any back to back testing of a FAST90 vs a FAST92? If so what was the outcome?
If tests were performed with only a FAST 92, what was the hp/tq difference compared to average FAST 90 results?
Please give detailed description of the mod set up on the car as well as ported/unported FAST.
Thanks
If tests were performed with only a FAST 92, what was the hp/tq difference compared to average FAST 90 results?
Please give detailed description of the mod set up on the car as well as ported/unported FAST.
Thanks
weigh in on at least some aspects of this question.
Thread Starter
Melting Slicks
Joined: May 2006
Posts: 2,891
Likes: 1
From: NJ..."the way I saw it, everyone takes a beating sometimes."
I have a FAST 90 which has been opened up to 92mm. Whats the diifference if any. I think the FAST 92 is simply a 90 opened up to 92 mm. Im not sure if thats the only difference though. We dont even have a posting of a non ported FAST VS PORTED FAST. You pose a unique question and I wish SPINMONSTER or COREY HARRIS would
weigh in on at least some aspects of this question.
weigh in on at least some aspects of this question.
Burning Brakes
Joined: Sep 2006
Posts: 781
Likes: 82
From: MA
I've got a SPIN-FAST 92 (Spin ported, firewall mod & painted), also installed by Spin. No dyno comparison but there is a definite hp/tq increase vs. my CH ported stocker.
The FAST 92 vs 90 - the 92 has larger 92 mm throat, some SS hardware and brass inserts, I believe those are the only real differences between the two units.
I hope this info helps.
The FAST 92 vs 90 - the 92 has larger 92 mm throat, some SS hardware and brass inserts, I believe those are the only real differences between the two units.
I hope this info helps.
Burning Brakes
Joined: Feb 2006
Posts: 903
Likes: 5
From: Miami FL
An article I read said that the differences in the tb opening is only 2mm. However, overall plenum volume is up by 20% according to the article. IIRC the bolted on a unported FAST 92 onto a cam only LS1 and saw and increase fo 20whp/22wtq. That is unheard of for an unported FAST over an LS6 unit at the 380-390whp level. The initial pull was 390 and the after pull was 410. No loss in tq anywhere.
Hope that helps.
Dougie
Hope that helps.
Dougie
Team Owner
Joined: Feb 2001
Posts: 27,246
Likes: 129
From: Short Hills, NJ
I know one notable change was in the mounting/sealing area of the throttle body, there are now threaded inserts instead of the former screw & bolt type set up and there is a more secure seal as well.
Of course it says "FAST 92mm" on it now as well.
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Melting Slicks
Joined: Sep 2007
Posts: 2,597
Likes: 3
From: READING PA
St. Jude Donor '08-'09-'10
An article I read said that the differences in the tb opening is only 2mm. However, overall plenum volume is up by 20% according to the article. IIRC the bolted on a unported FAST 92 onto a cam only LS1 and saw and increase fo 20whp/22wtq. That is unheard of for an unported FAST over an LS6 unit at the 380-390whp level. The initial pull was 390 and the after pull was 410. No loss in tq anywhere.
Hope that helps.
Dougie
Hope that helps.
Dougie
ls1lt1 ane another subtle difference along with the 2mm. I would still like to find out if there is some internal differences. For me PORTED
FAST 90 to 92 W Boltons only 412 RWHP / 408 RWTQ. Tremendous midrange 2000 - 6100 RPM.
Burning Brakes
Joined: Feb 2006
Posts: 903
Likes: 5
From: Miami FL
I think we can all agree that there is a 2mm difference in the FAST units. I think the article was comparing the OEM manifold showing a 20% increase in plenum volume for the FAST. They werent saying the 92 has 20% more plenum over the 90. The brass inserts mentioned by
ls1lt1 ane another subtle difference along with the 2mm. I would still like to find out if there is some internal differences. For me PORTED
FAST 90 to 92 W Boltons only 412 RWHP / 408 RWTQ. Tremendous midrange 2000 - 6100 RPM.
ls1lt1 ane another subtle difference along with the 2mm. I would still like to find out if there is some internal differences. For me PORTED
FAST 90 to 92 W Boltons only 412 RWHP / 408 RWTQ. Tremendous midrange 2000 - 6100 RPM.
Drifting
Joined: Jul 2000
Posts: 1,861
Likes: 1
From: Bremerton WA
St. Jude Donor '09
Not a lot of differences from my standpoint. No real changes in runner design that I can tell. Plenum looks the same. I've had 5 or 6 come through lately and none were actually 92mm bores until I made them larger. The hardwear and insert upgrades are nice, though. If I had a FAST 90 I would not sell it just to "upgrade" to the 92 version.
And they still didn't take the time to make it bolt-on LS2 friendly.... AAARRRGGGHHH! Spin and others have shown that a modified top-half is all it takes. Yet they did not take the opportunity to integrate the relatively minor redesign of the top cover. Wasted opportunity.
And they still didn't take the time to make it bolt-on LS2 friendly.... AAARRRGGGHHH! Spin and others have shown that a modified top-half is all it takes. Yet they did not take the opportunity to integrate the relatively minor redesign of the top cover. Wasted opportunity.
Last edited by Cory@LS2PortWorks; May 21, 2008 at 08:25 AM.
Melting Slicks
Joined: Sep 2007
Posts: 2,597
Likes: 3
From: READING PA
St. Jude Donor '08-'09-'10
Not a lot of differences from my standpoint. No real changes in runner design that I can tell. Plenum looks the same. I've had 5 or 6 come through lately and none were actually 92mm bores until I made them larger. The hardwear and insert upgrades are nice, though. If I had a FAST 90 I would not sell it just to "upgrade" to the 92 version.
And they still didn't take the time to make it bolt-on LS2 friendly.... AAARRRGGGHHH! Spin and others have shown that a modified top-half is all it takes. Yet they did not take the opportunity to integrate the relatively minor redesign of the top cover. Wasted opportunity.
And they still didn't take the time to make it bolt-on LS2 friendly.... AAARRRGGGHHH! Spin and others have shown that a modified top-half is all it takes. Yet they did not take the opportunity to integrate the relatively minor redesign of the top cover. Wasted opportunity.
Le Mans Master
Joined: Oct 2006
Posts: 5,078
Likes: 19
From: Cumming, GA
I will be making a thread for this in the near future. I have been scratching my head on this one for a long time as porting is 200-500 bucks depending on who you use. I want to know is it really worth it. I have a H/C C6 with untouched FAST 90 and am looking to have it ported by a pro to see if their port work really is worth the extra dollars. I use the same dyno everytime and am willing to run the car on the dyno again, unbolt and pack the unported right off the dyno, have it ported and put the car right back on the dyno with the ported. This will give the closest comparison of SAE gains possible as it will all take place within a matter of days for both dyno times.
Any porters up for the challenge?
Team Owner
Joined: Feb 2001
Posts: 27,246
Likes: 129
From: Short Hills, NJ
And they still didn't take the time to make it bolt-on LS2 friendly.... AAARRRGGGHHH! Spin and others have shown that a modified top-half is all it takes. Yet they did not take the opportunity to integrate the relatively minor redesign of the top cover. Wasted opportunity.
I really thought they would've considered the C6 (it does fit without modification on other LS2 vehicle applications, ie: GTO etc.) fitment issues when making a new/improved version of their otherwise awesome intake manifold.I wonder if the rectangle port/LS3 version (if it ever comes out LOL) will still require such modification to fit a C6.
Thread Starter
Melting Slicks
Joined: May 2006
Posts: 2,891
Likes: 1
From: NJ..."the way I saw it, everyone takes a beating sometimes."
Not a lot of differences from my standpoint. No real changes in runner design that I can tell. Plenum looks the same. I've had 5 or 6 come through lately and none were actually 92mm bores until I made them larger. The hardwear and insert upgrades are nice, though. If I had a FAST 90 I would not sell it just to "upgrade" to the 92 version.
And they still didn't take the time to make it bolt-on LS2 friendly.... AAARRRGGGHHH! Spin and others have shown that a modified top-half is all it takes. Yet they did not take the opportunity to integrate the relatively minor redesign of the top cover. Wasted opportunity.
And they still didn't take the time to make it bolt-on LS2 friendly.... AAARRRGGGHHH! Spin and others have shown that a modified top-half is all it takes. Yet they did not take the opportunity to integrate the relatively minor redesign of the top cover. Wasted opportunity.
Drifting
Joined: Jul 2000
Posts: 1,861
Likes: 1
From: Bremerton WA
St. Jude Donor '09
I have not had any 92mm dyno results sent back in to me. But as I've said... there is no apparent difference to warrant a gain in power. A bigger TB opening is meaningless on all but the most powerful combos running 92 or larger TB's. There is no reason for there to be a gain on a 90mm TB car.