LS6 intake VS fast 90?
LS6 intake VS fast 90? So I'm pretty new to LS power and I see Fast 90 intakes for sale pretty often. My '01 SS naturally came with the LS6 intake so I'm curious how much difference there is and at what point it's worth swapping.
I read the sticky and found this:
"What to look for: the ls6 intake will serve a great majority of setups. All 01-02 cars already have an ls6 intake. If you have a 98-00 and want to do an ls6 swap you'll need the new ls6 coolant tubes and plugs. If you have a stroker or are the kind of person who wants all the horsepower they can get look into the LSX.
- the 78mm LSX has shown marginal improvements over the ls6 intake and quite frankly not worth the swap. Stay with the ls6 intake or upgrade to the 90/90 setup
My car is currently in the shop getting LS6 heads, headers (ARH long tubes and y-pipe w/o cats) and a .617 lift cam with LS7 lifters and Comp Cams double springs and a Katech timing chain. All else is stock in the engine. So my question is at this point would there be much advantage to swapping the intake and TB or is it a waste of money? Thanks in advance, I'm still learning about modern performance engines, I'm get'n old and know more about the old school carbed cars from the days of my youth. lol
I can't see spending a lot to gain 5-10 hp but if it's considerably more than that I might do it at some point.
I read the sticky and found this:
"What to look for: the ls6 intake will serve a great majority of setups. All 01-02 cars already have an ls6 intake. If you have a 98-00 and want to do an ls6 swap you'll need the new ls6 coolant tubes and plugs. If you have a stroker or are the kind of person who wants all the horsepower they can get look into the LSX.
- the 78mm LSX has shown marginal improvements over the ls6 intake and quite frankly not worth the swap. Stay with the ls6 intake or upgrade to the 90/90 setup
My car is currently in the shop getting LS6 heads, headers (ARH long tubes and y-pipe w/o cats) and a .617 lift cam with LS7 lifters and Comp Cams double springs and a Katech timing chain. All else is stock in the engine. So my question is at this point would there be much advantage to swapping the intake and TB or is it a waste of money? Thanks in advance, I'm still learning about modern performance engines, I'm get'n old and know more about the old school carbed cars from the days of my youth. lol
I can't see spending a lot to gain 5-10 hp but if it's considerably more than that I might do it at some point.
The fast78 and fast90 are no longer available new. The ls6 is a big improvement over the ls1. We do have another option. We offer a 90mm 4 bolt intake very similar to the fast90. We have them with billet fuel rails and tb for $689 shipped.
Cheaper than the new fast92 manifold by itself.
In out of box form they are comparable to the ls6 manifold, but we touch up a few parts and make them flow better.
If you want more info, email me
Rpmspeedtech@gmail.com
Thanks
Cheaper than the new fast92 manifold by itself.
In out of box form they are comparable to the ls6 manifold, but we touch up a few parts and make them flow better.
If you want more info, email me
Rpmspeedtech@gmail.com
Thanks
Hot Rod magazine did a test comparing a bunch of manifolds on a 6.0L with heads/cam. Numbers at a glance were as follows,
LS1 manifold - 535hp/468tq
LS6 manifold - 557hp/483tq
FAST 90 - 571hp/490tq
I have a FAST 90/90 setup with fuel rail in the for sale section for $725 shipped.
LS1 manifold - 535hp/468tq
LS6 manifold - 557hp/483tq
FAST 90 - 571hp/490tq
I have a FAST 90/90 setup with fuel rail in the for sale section for $725 shipped.
The fast78 and fast90 are no longer available new. The ls6 is a big improvement over the ls1. We do have another option. We offer a 90mm 4 bolt intake very similar to the fast90. We have them with billet fuel rails and tb for $689 shipped.
Cheaper than the new fast92 manifold by itself.
In out of box form they are comparable to the ls6 manifold, but we touch up a few parts and make them flow better.
If you want more info, email me
Rpmspeedtech@gmail.com
Thanks
Cheaper than the new fast92 manifold by itself.
In out of box form they are comparable to the ls6 manifold, but we touch up a few parts and make them flow better.
If you want more info, email me
Rpmspeedtech@gmail.com
Thanks
Hot Rod magazine did a test comparing a bunch of manifolds on a 6.0L with heads/cam. Numbers at a glance were as follows,
LS1 manifold - 535hp/468tq
LS6 manifold - 557hp/483tq
FAST 90 - 571hp/490tq
I have a FAST 90/90 setup with fuel rail in the for sale section for $725 shipped.
LS1 manifold - 535hp/468tq
LS6 manifold - 557hp/483tq
FAST 90 - 571hp/490tq
I have a FAST 90/90 setup with fuel rail in the for sale section for $725 shipped.
Your post is what got me really wondering.
I found this thread with a Google search,lots of debate!
https://ls1tech.com/forums/generatio...s6-intake.html
Figure you could sell your LS6 intake and TB for maybe $400, and get a used Fast setup for around $700 or so. With that said you'll spend around $300 (plus re-tuning) for around 10 hp. Is that worth it....only you can answer that
I think just looking at peak to peak hp gains is probably the wrong way to look at it. Actual gains on dyno graphs etc can sometimes be more than that at any other rpm but people only want to compare peak to peak. Also the torque pickup would be worth it as well. The added plenum volume makes a big difference in that as well as runner style amd length.
Id rather look at all the points rather than just 1.
Id rather look at all the points rather than just 1.
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On your setup I really think you'll only gain around 10 hp maybe 15 max. I've seen all the claims and controversy around these intakes, but I personally saw one case where a guy only gained 9 hp. Same dyno only a few days apart. Another example is a good friend of mine who only gained 1 mph at the track on his heads and cam LS1
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Verdad Gallardo I think just looking at peak to peak hp gains is probably the wrong way to look at it. Actual gains on dyno graphs etc can sometimes be more than that at any other rpm but people only want to compare peak to peak. Also the torque pickup would be worth it as well. The added plenum volume makes a big difference in that as well as runner style amd length.
Id rather look at all the points rather than just 1.
Id rather look at all the points rather than just 1.
On your setup I really think you'll only gain around 10 hp maybe 15 max. I've seen all the claims and controversy around these intakes, but I personally saw one case where a guy only gained 9 hp. Same dyno only a few days apart. Another example is a good friend of mine who only gained 1 mph at the track on his heads and cam LS1
Thanks guys, appreciate the input a lot.
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Hot Rod magazine did a test comparing a bunch of manifolds on a 6.0L with heads/cam. Numbers at a glance were as follows,
LS1 manifold - 535hp/468tq
LS6 manifold - 557hp/483tq
FAST 90 - 571hp/490tq
I have a FAST 90/90 setup with fuel rail in the for sale section for $725 shipped.
LS1 manifold - 535hp/468tq
LS6 manifold - 557hp/483tq
FAST 90 - 571hp/490tq
I have a FAST 90/90 setup with fuel rail in the for sale section for $725 shipped.
moved outta state, and got a local shop saying the same thing. So not sure..
I never had any sealing issues fortunately, new gaskets and a home made bracket for the map sensor helped. i plan on going FI this or next season and i wont miss that FAST one bit.
My car is currently in the shop getting LS6 heads, headers (ARH long tubes and y-pipe w/o cats) and a .617 lift cam with LS7 lifters and Comp Cams double springs and a Katech timing chain. All else is stock in the engine. So my question is at this point would there be much advantage to swapping the intake and TB or is it a waste of money? Thanks in advance, I'm still learning about modern performance engines, I'm get'n old and know more about the old school carbed cars from the days of my youth. lol
I can't see spending a lot to gain 5-10 hp but if it's considerably more than that I might do it at some point.
I can't see spending a lot to gain 5-10 hp but if it's considerably more than that I might do it at some point.
A small 216/220 with ~.550 lift would probably give 40hp to 45+ hp gain at the wheels with the current LS6 intake and good tune. TSP says 53 hp on an engine dyno for a 5.3 so the 5.7 LS1 would probably be a little more.
https://www.texas-speed.com/p-5004-t...-camshaft.aspx
If a mega cam is planned the Fast intakes will be worth while.
My last tuner said the same thing, I was having a lot of leak issues and he spent a day (charging me for the time spent) trying to work with and couldnt get it exactly right. He called me and asked how I would feel about switching back to the LS6, so I just ended up switching back to a LS6 and selling my FAST92. Idles much better now and since its just a weekend car (never sees the track), its not a noticeable difference to me.
I'll have some numbers soon. Setup in sig. 447rwhp and 431rwtq with LS6 intake. I now have a ported Fast 90 which I ported the snout out to 92mm. On my setup, I'm expecting to eclipse 470rwhp with the intake/TB change.
Looking forward to seeing your results as my setup is similar to yours although I'm running home ported 243's.