LS2 vs Fast 90 dyno comparison
TECH Fanatic
Joined: Mar 2003
Posts: 1,946
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Originally Posted by uberLS-1
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.
Im not believing this at all. There are more issues that just an intake swap.
LS2, back to back to an LS6, TWICE, lost power to the LS6.
We all know the FAST makes solid gains across the board.
LS2, back to back to an LS6, TWICE, lost power to the LS6.
We all know the FAST makes solid gains across the board.
Originally Posted by Louis
Im not believing this at all. There are more issues that just an intake swap.
LS2, back to back to an LS6, TWICE, lost power to the LS6.
We all know the FAST makes solid gains across the board.
LS2, back to back to an LS6, TWICE, lost power to the LS6.
We all know the FAST makes solid gains across the board.
However, this is a very real dyno test. I am well aware the LS2 unported, will loose to the LS6. I dynoed the LS2 to find how it compared to the FAST, and it failed MISERABLY. So I figured, it (the LS2 intake) was useless anyway, so why not hack it open, and port it, and re test. That's what I did. Here are the results, like them or not. And as I stated, the FAST was reinstalled, and backed up the same numbers as the first dyno.
On The Tree
Joined: Sep 2005
Posts: 101
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Originally Posted by SideStep
Read post #7, the FAST was ported as well....
I'd still take the LSX/90 over the LS2 as Louis already pointed out...
I dis-agree with your statement that the porting of your intake was more inside than the runners...There isnt a whole lot that can be done inside a LSX,I smoothed out the casting flash,clean it up and contoured too but the work is in the runners and getting them to match the flow path of your heads....My LSX look like art work once I was done with it (10Hrs worth of work)
The only thing I'll say is IF u already have the LS2/90 then by all means try and port it as that cost zero...BUT if your running an LS6 then get that LSX/90 as it flat out works better than anything else out there as of now...
Just make sure u or someone else ports it correctly...
I dis-agree with your statement that the porting of your intake was more inside than the runners...There isnt a whole lot that can be done inside a LSX,I smoothed out the casting flash,clean it up and contoured too but the work is in the runners and getting them to match the flow path of your heads....My LSX look like art work once I was done with it (10Hrs worth of work)
The only thing I'll say is IF u already have the LS2/90 then by all means try and port it as that cost zero...BUT if your running an LS6 then get that LSX/90 as it flat out works better than anything else out there as of now...
Just make sure u or someone else ports it correctly...
Originally Posted by JS
I'd still take the LSX/90 over the LS2 as Louis already pointed out...
I dis-agree with your statement that the porting of your intake was more inside than the runners...There isnt a whole lot that can be done inside a LSX,I smoothed out the casting flash,clean it up and contoured too but the work is in the runners and getting them to match the flow path of your heads....My LSX look like art work once I was done with it (10Hrs worth of work)
The only thing I'll say is IF u already have the LS2/90 then by all means try and port it as that cost zero...BUT if your running an LS6 then get that LSX/90 as it flat out works better than anything else out there as of now...
Just make sure u or someone else ports it correctly...
I dis-agree with your statement that the porting of your intake was more inside than the runners...There isnt a whole lot that can be done inside a LSX,I smoothed out the casting flash,clean it up and contoured too but the work is in the runners and getting them to match the flow path of your heads....My LSX look like art work once I was done with it (10Hrs worth of work)
The only thing I'll say is IF u already have the LS2/90 then by all means try and port it as that cost zero...BUT if your running an LS6 then get that LSX/90 as it flat out works better than anything else out there as of now...
Just make sure u or someone else ports it correctly...
I did port this inside,smooth it and took my time but again more time was done on the runners and how they were contoured..I spent 10 hrs total from the time I took it apart,ported it then hand finished it with 1000,1500,2000 grit...
Mine worked and I also went 10.80's@124 with a little 224 cam
U needed that GIANT 238 to run the same #
Mine worked and I also went 10.80's@124 with a little 224 cam
U needed that GIANT 238 to run the same #
Originally Posted by JS
...
Mine worked and I also went 10.80's@124 with a little 224 cam
U needed that GIANT 238 to run the same #
Mine worked and I also went 10.80's@124 with a little 224 cam
U needed that GIANT 238 to run the same #
LOL, you got me there. I didn't mean to offend, I misunderstood that you didn't port inside the intake.
However, since you brought up my cam selection,( Im assuming from a previous dyno post), in comparison to how much better you did running a 10.8 @ 124 ,which was awsome. I agree you must have done things right with suspension, weight reduction, and power. Congrats. However, All the cars Ive done with the "huge 238 cams", are all in the 10.6-10.8s, ALL trapping high 128s with factory weight . So Id say they are putting down another 40 or so more hp than you did, and probably weigh a little more . But like you said, they should with a "HUGE" cam.
This post was for strictly a Info sharing purpose, not to start flames.
peace-Dave
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nuf said My car weighed 100lbs less than yours had LS6 heads ported by a local guy with STOCK GM VALVES...I wouldnt call it some elaborate setup,also it was tuned in closed loop and idled like a stocker with the 224 cam...Again 10.80's@124 THREW AN A4 not a 6sp But I agree this is BS,We were discussing the intake so lets play nice...
But I agree this is BS,We were discussing the intake so lets play nice... 
Originally Posted by JS
I did port this inside,smooth it and took my time but again more time was done on the runners and how they were contoured..I spent 10 hrs total from the time I took it apart,ported it then hand finished it with 1000,1500,2000 grit...
Mine worked and I also went 10.80's@124 with a little 224 cam
U needed that GIANT 238 to run the same #
Mine worked and I also went 10.80's@124 with a little 224 cam
U needed that GIANT 238 to run the same #
Nate
Originally Posted by ws6sojuiced01
May be stupid ? but can you port the ls6 intake and if so how well would it flow( just asking dont know much about it)
Thanks for the replys about the intake. I didnt post the graph to imply the car was out of the ordinary fast or powerful, just a comparison of fast vs ls2 (note post title.) Also, this combo isnt in my car (but in a customers ). My car is in the sig.(also not blazing fast yet)
To answer a few questions.
Today 07:27 AM
beardWS6 Just curious, how much would I gain porting my LSX 90 set-up?
A FAST usually picks up about 5-15hp from ported.
Today 09:00 AM
ws6sojuiced01 May be stupid ? but can you port the ls6 intake and if so how well would it flow( just asking dont know much about it)
I dont think you wold gain much porting a LS6. It doesnt have too many major port entry or radius problems(Unlike the LS2)
To answer a few questions.
Today 07:27 AM
beardWS6 Just curious, how much would I gain porting my LSX 90 set-up?
A FAST usually picks up about 5-15hp from ported.
Today 09:00 AM
ws6sojuiced01 May be stupid ? but can you port the ls6 intake and if so how well would it flow( just asking dont know much about it)
I dont think you wold gain much porting a LS6. It doesnt have too many major port entry or radius problems(Unlike the LS2)
Originally Posted by lt1dave
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
Originally Posted by Nate_Taufer
Nice times...but what's not to like? He cut the ****** in half ported it and then put it back together. The combo works. I think this is what we needed, an affordable alternative to the FAST intakes (that are un-godly over priced) that make close to the same power.
Nate
Nate
so how much would you guys charge for the ls2 intake and cut it open and port it.??
