LS2 vs Fast 90 dyno comparison
LS2 vs Fast 90 dyno comparison This is a customers car I just tuned with a fast 90/90, then installed a LS2 we ported to see the results. Its pretty surprising how close they are.
Mods are My 234 custm grind cam, patriot stage 2 LS6 (out of the box), pacesetters, magnaflow catback, ASP, 9inch(4.30s).
The difference of the fast 453/404 vs ls2 452/406 isnt too horrible. The fast pulling higher on the top would make the car probaby a tenth faster.
http://lt1dave.com/media/ls2%20vs%20fast90.bmp
Mods are My 234 custm grind cam, patriot stage 2 LS6 (out of the box), pacesetters, magnaflow catback, ASP, 9inch(4.30s).
The difference of the fast 453/404 vs ls2 452/406 isnt too horrible. The fast pulling higher on the top would make the car probaby a tenth faster.
http://lt1dave.com/media/ls2%20vs%20fast90.bmp
Last edited by lt1dave; Nov 5, 2005 at 10:09 AM.
Holy download time Batman!
Interesting graph, but the FAST gains up high look more like you're having valvetrain stability problems since you installed the LS2 intake. The RPM falls too fast to be airflow related IMO. Also, the FAST loss down low does not match any of the comparisons I've seen on this board in the past. Normally, the stock, unported FAST maintains the torque down low, then pulls away up high. Do you know what kind of correction factors/weather conditions you had from one month to the other?
Interesting graph, but the FAST gains up high look more like you're having valvetrain stability problems since you installed the LS2 intake. The RPM falls too fast to be airflow related IMO. Also, the FAST loss down low does not match any of the comparisons I've seen on this board in the past. Normally, the stock, unported FAST maintains the torque down low, then pulls away up high. Do you know what kind of correction factors/weather conditions you had from one month to the other?
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
Originally Posted by Patrick G
Holy download time Batman!
Interesting graph, but the FAST gains up high look more like you're having valvetrain stability problems since you installed the LS2 intake. The RPM falls too fast to be airflow related IMO. Also, the FAST loss down low does not match any of the comparisons I've seen on this board in the past. Normally, the stock, unported FAST maintains the torque down low, then pulls away up high. Do you know what kind of correction factors/weather conditions you had from one month to the other?
Interesting graph, but the FAST gains up high look more like you're having valvetrain stability problems since you installed the LS2 intake. The RPM falls too fast to be airflow related IMO. Also, the FAST loss down low does not match any of the comparisons I've seen on this board in the past. Normally, the stock, unported FAST maintains the torque down low, then pulls away up high. Do you know what kind of correction factors/weather conditions you had from one month to the other?
The fast defineatly made about anoter 10 hp up top, but the LS2 made more mid/low numbers by about 10. Porting the LS2 changed the intake DRAMATICALLY, so it wont be even close to any charts you have seen in the past.
Thats wierd we lost power switching from a LS6 to a LS2.. So we bought a FAST 90/90 we will have back to back dynos really soon.
Also something to think about.. The LS2 intake stock flows around about the same as a stock LS1 intake. I dont think it could be ported to the levels of a LSx 90.
Also something to think about.. The LS2 intake stock flows around about the same as a stock LS1 intake. I dont think it could be ported to the levels of a LSx 90.
Originally Posted by Mr Powell
Thats wierd we lost power switching from a LS6 to a LS2.. So we bought a FAST 90/90 we will have back to back dynos really soon.
Also something to think about.. The LS2 intake stock flows around about the same as a stock LS1 intake. I dont think it could be ported to the levels of a LSx 90.
Also something to think about.. The LS2 intake stock flows around about the same as a stock LS1 intake. I dont think it could be ported to the levels of a LSx 90.
Last edited by lt1dave; Nov 5, 2005 at 08:08 PM.
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Thanks. Im a mechanic and tuner, but not much of a computer wiz I guessLOL 
Most of the work is at the entry of the runners inside the manifold. They are horrible in as cast form, and wont flow well at higher rpm. I cut open the intake and pretty much redesigned the runners. I expected to loose some (allot) of low end tq because of it, but as you can see, it didn't. It was certainly allot closer to the fast than we thought it would be.
As to the question of a stock bottom end spinning 7k. We do it all the time. Just add some rod bolts. Ive yet to loose one! (I shift mine at 7400!)
Dave
Most of the work is at the entry of the runners inside the manifold. They are horrible in as cast form, and wont flow well at higher rpm. I cut open the intake and pretty much redesigned the runners. I expected to loose some (allot) of low end tq because of it, but as you can see, it didn't. It was certainly allot closer to the fast than we thought it would be.
As to the question of a stock bottom end spinning 7k. We do it all the time. Just add some rod bolts. Ive yet to loose one! (I shift mine at 7400!)
Dave
So in real world drag racing.... even know the FAST has more up top and the LS2 has more down low which intake will be faster on the track?
Wish I had some extra cash for a dyno....(kinda saving up for a 402) but I have a TPIS 75x90 oval intake and TB on the self and a 90 Fast intake and TB on the car now I would love to do a swap on the dyno just to see what is up.
I really feel since I went to the 90 Fast intake I have lost low and midrange but the top feels the same. So I am up in the air....
Wish I had some extra cash for a dyno....(kinda saving up for a 402) but I have a TPIS 75x90 oval intake and TB on the self and a 90 Fast intake and TB on the car now I would love to do a swap on the dyno just to see what is up.
I really feel since I went to the 90 Fast intake I have lost low and midrange but the top feels the same. So I am up in the air....
At the track, I would expect to see a min. of a tenth gain from the FAST over the LS2. This is due to the fact that your not going to hit the rpm where the LS2 is making more power, but you will hit the high rpm where the FAST makes more.
If you didnt port your FAST, Id say you didnt pick up a much at all over the 90mmLS6, especially if you havent dynotuned to optomize. The FAST leaves alot to be desired in unported form, especially for the price.
Dave
If you didnt port your FAST, Id say you didnt pick up a much at all over the 90mmLS6, especially if you havent dynotuned to optomize. The FAST leaves alot to be desired in unported form, especially for the price.
Dave
Yep I hear yea....Just waiting till spring to get down to Speed inc for a decent dyno tune... Still running on a mail order tune now.
Ok who ports these Fast intakes and do you need the heads? Can you just do a one size fits all porting. Or should I just wait until I get a new set up.
I plan one getting new heads with a 402 as soon as this stocker goes BOOM so I don't want sink to much money into this setup for now. Would like to see 440 to the rear however so I don't feel like I wasted money now.
Thanks
Ok who ports these Fast intakes and do you need the heads? Can you just do a one size fits all porting. Or should I just wait until I get a new set up.
I plan one getting new heads with a 402 as soon as this stocker goes BOOM so I don't want sink to much money into this setup for now. Would like to see 440 to the rear however so I don't feel like I wasted money now.
Thanks
I ported my LSX/90TB myself
Results over the LS6/78TB were 1.6ET/2MPH
I'd port it if your going to the trouble of putting it on..
I'll be adding one to my GTO,even with a small cam there worth 15RW....
Results over the LS6/78TB were 1.6ET/2MPH
I'd port it if your going to the trouble of putting it on..
I'll be adding one to my GTO,even with a small cam there worth 15RW....
On The Tree
Joined: Sep 2005
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This was comparing a ported manifold versus one out of the box....close still. But the LS2 is maxed out, if they were the same cost I would still get the FAST simply to have room to expand in the future....but wouldn't dare put it on unported.
