How much hp gain from LS6 to FAST intake?
How much hp gain from LS6 to FAST intake? Car is a 2005 CTS-V.
I am wondering if there are any gains (mid-range and peak) in swapping the intake and throttle body out for something else.
346" LS6
11:1 comp
ported 243's (no flow sheets but professionally done)
Custom comp cam 3633R/3475R which is 228/238; .600/.613; 112+3
Kooks 1 3/4 LT's, off road midpipe, cutouts
K&N FIPK
stock TB
stock ls6 intake
I am getting a retune on the car and thought before I do that maybe there could be considerable gains on the intake side. Since the cam is not common, it may be difficult to say if the engine will like the larger intake tract or not.
I am wondering if there are any gains (mid-range and peak) in swapping the intake and throttle body out for something else.
346" LS6
11:1 comp
ported 243's (no flow sheets but professionally done)
Custom comp cam 3633R/3475R which is 228/238; .600/.613; 112+3
Kooks 1 3/4 LT's, off road midpipe, cutouts
K&N FIPK
stock TB
stock ls6 intake
I am getting a retune on the car and thought before I do that maybe there could be considerable gains on the intake side. Since the cam is not common, it may be difficult to say if the engine will like the larger intake tract or not.
Last edited by somethingclever; Jul 22, 2014 at 11:54 AM.
I've got a stock crate LS6 longblock swapped into my '98 Z28. I put down 385.9 RWHP with an LS6 intake and stock ported TB (as well as the usual bolt-ons). I swapped over to the FAST 92mm and Nick Williams 92mm TB and then got back on the dyno and put down 400.1 RWHP. This has all been within the past month too. My FAST 92 was NOT ported, just as it came out of the box, and I picked up roughly 15 RWHP with it.
are these peak pickup's or also mid-range?
The V is a portly car at 4000lbs with driver....mid-range is good...also the car is a DD...and rarely is at hp peak.
Thanks for the feedback so far.
The V is a portly car at 4000lbs with driver....mid-range is good...also the car is a DD...and rarely is at hp peak.
Thanks for the feedback so far.
The FAST will begin to pul away from the ls6 around 3500 rpm. The torque in the midrange will improve a lot which is more of what you'll "feel" driving around tq gains are usually anywhere from 15-25 depending on the setup. The hp there maybe roughly 5-10 more but will keep pulling away as rpms climb. It's def worth while if you have the money and I'd say your car would greatly benefit from one.
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I've got a stock crate LS6 longblock swapped into my '98 Z28. I put down 385.9 RWHP with an LS6 intake and stock ported TB (as well as the usual bolt-ons). I swapped over to the FAST 92mm and Nick Williams 92mm TB and then got back on the dyno and put down 400.1 RWHP. This has all been within the past month too. My FAST 92 was NOT ported, just as it came out of the box, and I picked up roughly 15 RWHP with it.
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You have almost the same setup I had and a FAST 102/NW 102 netted me 18 RWHP
I had 228/232 .612/.600 111
CNC'd 243s
LTs
42# greentops
I also optimized my exhaust system adjusting my mid-pipe (collector) length and switching to Borlas and gained 30+ ft/lb RWTQ at 2,000 RPM
I had 228/232 .612/.600 111
CNC'd 243s
LTs
42# greentops
I also optimized my exhaust system adjusting my mid-pipe (collector) length and switching to Borlas and gained 30+ ft/lb RWTQ at 2,000 RPM
those are some pretty respectable gains...especially in the mid-range where I need it the most.
I just wish those pieces of phenolic and dbw TB's weren't such big money! After that I would end up needed more injector too. doh!
I just wish those pieces of phenolic and dbw TB's weren't such big money! After that I would end up needed more injector too. doh!
I'm also on shorty headers and still have the stock cats. I'm very pleased with my numbers after the FAST 92. I was on a quest to hit 400 RWHP without touching the internals of my LS6 and the FAST 92 got me where I was hoping it would!
TECH Enthusiast
Joined: Jul 2012
Posts: 552
Likes: 1
you can get played easily from people trying to sell you on the fast intakes... realisticly you wont gain more than about 5-7rwhp even with a ported one... the flow of a ported fast 92 is only about 7-10 cfm higher than a stock ls6 manifold... totally not worth it for the money in my opinion... and i have a ported fast 92 done from Vengeance racing
you can get played easily from people trying to sell you on the fast intakes... realisticly you wont gain more than about 5-7rwhp even with a ported one... the flow of a ported fast 92 is only about 7-10 cfm higher than a stock ls6 manifold... totally not worth it for the money in my opinion... and i have a ported fast 92 done from Vengeance racing
you can get played easily from people trying to sell you on the fast intakes... realisticly you wont gain more than about 5-7rwhp even with a ported one... the flow of a ported fast 92 is only about 7-10 cfm higher than a stock ls6 manifold... totally not worth it for the money in my opinion... and i have a ported fast 92 done from Vengeance racing
On The Tree
Joined: Mar 2011
Posts: 125
Likes: 0
you can get played easily from people trying to sell you on the fast intakes... realisticly you wont gain more than about 5-7rwhp even with a ported one... the flow of a ported fast 92 is only about 7-10 cfm higher than a stock ls6 manifold... totally not worth it for the money in my opinion... and i have a ported fast 92 done from Vengeance racing
....First off an ls6 intake in stock form flows 247 cfm give or take. A FAST 92 flows 265 out of the box unported and a FAST 102 flows 272. Both gain quite a bit when ported but even 5-10 cfm will show a measurable dyno gain
LS6 Stock Intake
.100 72.2
.200 141.7
.300 204.4
.400 227.4
.500 247.7
.550 256.0
.600 260.5
.650 269.5
Fast 92 - Stock
.100 71.4
.200 144.7
.300 205.9
.400 235.7
.500 259.0
.550 270.8
.600 272.6
.650 276.2
Fast 102 - Stock
.100 74.4
.200 150.7
.300 211.9
.400 241.7
.500 265.6
.550 271.7
.600 274.0
.650 278.4
OP, guess you need to ask yourself if the gains are going to be worth the cost. There are gains to be had, that's been proven, but only you can say if it's going to be worth it in the end.