fast intake vers. ls2 90/92
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Teching In
Joined: Feb 2011
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From: middletown Pa.
fast intake vers. ls2 90/92 motor almost done ( 383, tea 799 stage 2 heads, comp 235/243 620/623 113 cam, longtubes, y pipe no cats) I really don't want fast 102 if I could type fast enough I'd love a fast 92 but always gone by the time I'm done pecking these keys anyway i seen speed Inc has ls2 convertion. What do you guy's think am I losing hp. versus fast 102 ?????
I gained 10hp. just by having LS2 portworks port my LS6 intake & throttle body. Since I already had the parts, this was a ton cheaper ($450 total expense) than doing a fast intake & aftermarket throttle body which usually net an additional 15hp. over a stock LS6 intake & throttle body. If money is no object, the best combo is a Mamo or Vengeance ported Fast 102 & 102mm. throttle body. Just my $.02.
There is very little better a ported FAST 90/92/102 intake IMO. The LS2/LS6 intakes can't compete with em. In my opinion, the only thing you can get that flows better is a sheet-metal intake which is almost twice the price of the FASTs. I would have to agree they are worth 10-25whp too. There is a reason why they are so popular. I even said back in the day that I dont know if I'd ever have one, but I shelled the money out. Couldnt be happier either. Just like buying a rear, no one wants to spend the $3000+ to get one, but they are required for these cars.
The bigger TB made the LS6 intake flow better? More air through a larger TB into the intake doesn't allow (make) the intake disperse more air than it is capable of. I would think that such a conversion would be practically useless. Do you have dyno sheets (before and after comparisons) that show a substantial gain in HP from said conversion?
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Wow a 20 rwhp gain from this conversion. Well speaking from my box,if any of you dudes out there believe this crap...I've got a bridge I'd like to sell ya really cheap!! See ya...it's not worth wasting anymore time on.
I don't think you get what he saying. They modify the LS6 intake with a 90mm nose..not just putting a 90mm TB on a LS6 intake..
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
but ignorance is a bliss, people like him are good for business, and they make average ones like me look better all the time.
Yeah 20 rwhp for about 350$$ + LS2 TB is **** and definitely not worth it
Originally Posted by david vericker 
Wow a 20 rwhp gain from this conversion. Well speaking from my box,if any of you dudes out there believe this crap...I've got a bridge I'd like to sell ya really cheap!! See ya...it's not worth wasting anymore time on.
Boy... I remember my first beer.....
Wow a 20 rwhp gain from this conversion. Well speaking from my box,if any of you dudes out there believe this crap...I've got a bridge I'd like to sell ya really cheap!! See ya...it's not worth wasting anymore time on.
Boy... I remember my first beer..... Last edited by dr_whigham; Jul 13, 2011 at 03:06 AM.
Excuse my ignorance,but I need to ask you this question. Why does a ported FAST 78mm/92mm/and 102mm intake improve HP/TQ over their stock counterparts when the TB's are unchanged? It's because the TB's are already supplying more air than the non-ported intakes can utilize,so improving the flow characteristics of the intakes by porting is what really makes the additional power. Thus adding a larger TB will only supply more air which is a mute factor when considering that the stock intake is unable to utilize the air that is already being supplied by the matching TB's for said intakes. Changing the nose (nozzle) on a intake to accept a larger TB does not change (improve) the flow characteristics of the intake,and we all know that porting a LS6 intake is not worth the time or money. So please tell us how this magic improvement of 20 rwhp is produced by this conversion.
Oh,there is really no need to call one names...it's very unprofessional of you.
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
First of all David, you're the one that came out talking smack because you simply do not understand it.
you're even unwilling to read info from people who have done it and seen improvements.
There was even way back an article in a magazine that swapped various TBs and intakes, the best (not by much) was a 90/90 FAST, then came TPIS 90/modified LS6, then oval TPIS TB with LS6, then just plain LS6.
There is plenty info on Corvette Forum as well.
BTW the graph above was from a stock internal Z06 and Crane 1.8 rockers (1.8 rockers were on before intake swap and after).
As I said I used a prototype BBK 85mm and my intake modified by TPIS and I saw a good 15rwhp across the curve. So it does work.
you're even unwilling to read info from people who have done it and seen improvements.
There was even way back an article in a magazine that swapped various TBs and intakes, the best (not by much) was a 90/90 FAST, then came TPIS 90/modified LS6, then oval TPIS TB with LS6, then just plain LS6.
There is plenty info on Corvette Forum as well.
BTW the graph above was from a stock internal Z06 and Crane 1.8 rockers (1.8 rockers were on before intake swap and after).
As I said I used a prototype BBK 85mm and my intake modified by TPIS and I saw a good 15rwhp across the curve. So it does work.
I no longer have one of the dyno sheets, but I installed the TPIS re-snouted LS6 intake with a stock LS2 90mm throttlebody on my EPS-cammed 2005 CTS-V LS6 and picked-up 13 rwhp over the stock intake and 78mm throttlebody.
Excuse my ignorance,but I need to ask you this question. Why does a ported FAST 78mm/92mm/and 102mm intake improve HP/TQ over their stock counterparts when the TB's are unchanged? It's because the TB's are already supplying more air than the non-ported intakes can utilize,so improving the flow characteristics of the intakes by porting is what really makes the additional power. Thus adding a larger TB will only supply more air which is a mute factor when considering that the stock intake is unable to utilize the air that is already being supplied by the matching TB's for said intakes. Changing the nose (nozzle) on a intake to accept a larger TB does not change (improve) the flow characteristics of the intake,and we all know that porting a LS6 intake is not worth the time or money. So please tell us how this magic improvement of 20 rwhp is produced by this conversion.
Oh,there is really no need to call one names...it's very unprofessional of you.
Oh,there is really no need to call one names...it's very unprofessional of you.
Excuse my ignorance,but I need to ask you this question. Why does a ported FAST 78mm/92mm/and 102mm intake improve HP/TQ over their stock counterparts when the TB's are unchanged? It's because the TB's are already supplying more air than the non-ported intakes can utilize,so improving the flow characteristics of the intakes by porting is what really makes the additional power. Thus adding a larger TB will only supply more air which is a mute factor when considering that the stock intake is unable to utilize the air that is already being supplied by the matching TB's for said intakes. Changing the nose (nozzle) on a intake to accept a larger TB does not change (improve) the flow characteristics of the intake,and we all know that porting a LS6 intake is not worth the time or money. So please tell us how this magic improvement of 20 rwhp is produced by this conversion.
The LS2 intake can be ported in 2 ways: porting the runners to match the heads and porting the guts of the intake to allow for more volume within.
Now people have ported the runners and gotten 5-10 rwhp. Then they ported the guts of the intake and got another 5-10 rwhp. Yet they did not touch the runners the second time, so where did this power come from? If what you're saying is true, as in you can cram as much air in the intake as you want, it's still going to be limited by the runners, then this idea would not work. But people have done it, keeping the runners the same size and shape, and only improving the volume of air in the intake and they gained power.
So the same works for the LS6 with the bigger TB opening. Sure that doesn't improve the actual flow thru the runners, but it allows for more air to enter in the bowls of the manifold that then is available for the runners to take.