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How much horsepower?
Thread Starter
Melting Slicks
Joined: Feb 2008
Posts: 3,286
Likes: 6
From: Palm Beach
How much horsepower?
How much horsepower will the LT4 induction plumbing (air filter, maf, and throttle body) support. You can have terrific heads but if the induction piping can't keep up?
Team Owner
Joined: Oct 2004
Posts: 35,065
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From: Bergen County, NJ Democrats, doing for the country what they did for Michigan
From what I have read that induction piping should support up to 500 HP.
Don't bet the house on it. But that's what I recall.
I assume you're talking from the TB forward. The TB is the last of the problems, the filter is no big difference. The MAF, I don't know.
Don't bet the house on it. But that's what I recall.
I assume you're talking from the TB forward. The TB is the last of the problems, the filter is no big difference. The MAF, I don't know.
Racer
Joined: Dec 2007
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From: San Antonio Texas
Le Mans Master
Joined: Jun 2006
Posts: 5,642
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From: One day you're a Comet...the next day you're dust... Arkansas
I have seen those numbers. Not sure that the MAF can limit HP. The only issue I see is the throttle body. Isn't it 52mm?
Le Mans Master
Joined: Aug 2004
Posts: 5,141
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From: Metairie Louisiana
Last edited by rickneworleansla; Mar 3, 2008 at 04:11 PM.
Le Mans Master
Joined: Jun 2006
Posts: 5,642
Likes: 5
From: One day you're a Comet...the next day you're dust... Arkansas
Le Mans Master
Joined: Aug 2004
Posts: 5,141
Likes: 7
From: Metairie Louisiana
"The 48mm throttle body remained unchanged from the LT1, however all LT4 equipped Corvettes (not just Z16 Grand Sports) featured a throttle body top cover plate with the words "Grand Sport" in red letters."
http://www.grandsportregistry.com/lt1vslt4.htm
http://www.grandsportregistry.com/lt1vslt4.htm
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Melting Slicks
Joined: Oct 2006
Posts: 2,238
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From: College Station TX
From what I have heard, the air filter, MAF, and ducting will support quite a bit. I have heard a lot of horror stories about aftermarket MAF's, so I will stick with the stock one on my 383.
Melting Slicks
Joined: May 2001
Posts: 3,014
Likes: 18
From: Raleigh, NC
It's a lot. More than you'll make with an NA small block.
The only restriction to the MAF is in the tuning tables. I'm not sure what the maximum grams per second of air a MAF will read, but I've seen numbers upwards of 450. The highest grams of air per second number I've personally seen was about 455. The car that produced those numbers made ~450 RWHP.
I really don't think you have much to worry about in the intake plumbing department. The reason you aren't getting answers is because not many people (or maybe no one) has made enough power for it to become an issue.
Guys with 600+ RWHP are always power adder cars, and they have to change the intake tubing to accommodate the forced air plumbing associated with their power adder. Nitrous cars see those numbers sometimes, but they are making the power without having to move a massive amount of air, so none of those guys change the stock stuff either.
Some people run an intake called the SLP claw, but I've never heard of it increasing the HP of the car by a tremendous amount.
The only restriction to the MAF is in the tuning tables. I'm not sure what the maximum grams per second of air a MAF will read, but I've seen numbers upwards of 450. The highest grams of air per second number I've personally seen was about 455. The car that produced those numbers made ~450 RWHP.
I really don't think you have much to worry about in the intake plumbing department. The reason you aren't getting answers is because not many people (or maybe no one) has made enough power for it to become an issue.
Guys with 600+ RWHP are always power adder cars, and they have to change the intake tubing to accommodate the forced air plumbing associated with their power adder. Nitrous cars see those numbers sometimes, but they are making the power without having to move a massive amount of air, so none of those guys change the stock stuff either.
Some people run an intake called the SLP claw, but I've never heard of it increasing the HP of the car by a tremendous amount.