Sheetmetal Intake
Thread Starter
Race Director
Joined: Jul 2007
Posts: 10,959
Likes: 2,641
From: Texas Hill Country
Sheetmetal Intake
I have a 408 that is making around 500 rwhp NA and 700 on nitrous (200 wet). I am running the FAST 90 and was wondering if I can pick up decent power with a front mount TB sheetmetal intake. I shift at 7K.
Thanks!
Thanks!
Safety Car
Joined: Apr 2003
Posts: 4,251
Likes: 7
From: Woodbridge Ontario
Loose too much under the curve, for a small gain up top.
In the right application (drag car), it may be advantageous.
Check LS1Tech. Many posts about it.
Instructor
Joined: Mar 2005
Posts: 242
Likes: 0
From: Lodi California
What if you got a twin turbo 427. With so much low end torque
will it matter much? If I am looking for top end power and more
traction, will a sheet metal intake make sense?
Sorry for the hijack.
will it matter much? If I am looking for top end power and more
traction, will a sheet metal intake make sense?
Sorry for the hijack.
Former Vendor
Joined: Feb 2004
Posts: 10,876
Likes: 8
From: Las Vegas NV
St. Jude Donor '06 & '12
Been there, done that, spent the 2600 bucks, and ripped it off within 2 weeks.
We lost 67rwtq, and gained 22rwhp. The car felt flat until over 5K. This was on my LSx 454.
I would do a ported 102, with a comparible TB. Dont waste your money on the manifold unless you are willing to spend the money on the TB. They just dont pick up enough power without it.
We lost 67rwtq, and gained 22rwhp. The car felt flat until over 5K. This was on my LSx 454.
I would do a ported 102, with a comparible TB. Dont waste your money on the manifold unless you are willing to spend the money on the TB. They just dont pick up enough power without it.
Safety Car
Joined: Apr 2003
Posts: 4,251
Likes: 7
From: Woodbridge Ontario
But I'd suspect that's more for structural integrity at the high psi levels than increasing power.
Fast intakes have been known to catistrophically fail at over 15psi.
Last edited by tlaselva; Dec 1, 2009 at 03:41 PM.
Drifting
Joined: Jan 2005
Posts: 1,517
Likes: 0
I've seen a bunch of posts with TT monsters or other FI cars building really beautiful sheetmetal intakes from scratch.. a bunch of them end up removing them for something that doesn't slaughter their low end so much..
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Instructor
Joined: Mar 2005
Posts: 242
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From: Lodi California
and even 3rd, on some build, then why does it matter?
Drifting
Joined: Jan 2005
Posts: 1,517
Likes: 0
Didn't say it did, just stating facts after watching bunch of very nice hand made sheet metal intakes being taken off- it's not like it was my car lol.
Melting Slicks
Joined: Mar 2005
Posts: 2,225
Likes: 42
From: Okinawa
Been there, done that, spent the 2600 bucks, and ripped it off within 2 weeks.
We lost 67rwtq, and gained 22rwhp. The car felt flat until over 5K. This was on my LSx 454.
I would do a ported 102, with a comparible TB. Dont waste your money on the manifold unless you are willing to spend the money on the TB. They just dont pick up enough power without it.
We lost 67rwtq, and gained 22rwhp. The car felt flat until over 5K. This was on my LSx 454.
I would do a ported 102, with a comparible TB. Dont waste your money on the manifold unless you are willing to spend the money on the TB. They just dont pick up enough power without it.
Drifting
Joined: Aug 2006
Posts: 1,629
Likes: 6
From: Little Rock Arkansas
The fast 90 is for cathedral ports and the 102 is for L92 style ports. Am I missing something here?
Thread Starter
Race Director
Joined: Jul 2007
Posts: 10,959
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From: Texas Hill Country
Safety Car
Joined: Apr 2003
Posts: 4,251
Likes: 7
From: Woodbridge Ontario
Tuner shown that a properly ported LS7 is very similar power gains to a 'out of the box' Fast LSx.
Not sure if there's any reliable data comparing a Ported Fast 92 cathedral intakes to Fast 102's.
But for wiw, the same tuner also only gained 5rwhp going from a 92mm TB on a LSx intake to a 100mm TB on the same intake. It's all on LS1Tech if you know how to search.
Not sure if there's any reliable data comparing a Ported Fast 92 cathedral intakes to Fast 102's.
But for wiw, the same tuner also only gained 5rwhp going from a 92mm TB on a LSx intake to a 100mm TB on the same intake. It's all on LS1Tech if you know how to search.
Last edited by tlaselva; Dec 2, 2009 at 02:14 PM.
Collections Hold
Joined: May 2003
Posts: 3,520
Likes: 2
From: Tacoma WA
You may want to try a single plain first, they are much cheaper. Again, you will lose a little down low and gain a little on the top. I went single plain for strength, and I already was pumping out 685rwtq at 3500 rpm, so no problem loosing a little. I also added a plenum spacer for more volume and thus extend the top-end a tad bit more. My opinion is, once you get to a certain power level, dialing in where you need it most can be a benefit for some. Running a 6-speed, I don't care what happens down low because it's run as a drag racer about 90% of the time. 
Robert
Robert
