LT4 real horsepower?
LT4 real horsepower? So a lt4 camaro supp runs a 13.2 @ 109 with a 4.9 0-60 time according to tests. It was rated at 330hp.
No way having just 1.6 rr's lighter valves, slightly better flowing heads and a slightly bigger cam made it run that fast over a stock LT1.
To run that time and trap wouldn't it need to make at least 360+fwhp?
No way having just 1.6 rr's lighter valves, slightly better flowing heads and a slightly bigger cam made it run that fast over a stock LT1.
To run that time and trap wouldn't it need to make at least 360+fwhp?
Why not? I ran a few stock auto 323 cars that ran consistent 13.8's, and I've heard of a few stock stick cars(mostly SS/WS6's/Firehawks) going 13.5-7's. Supposedly a couple of LT1 cars have hit lower 13's stock but id have to see that to believe it.
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Joined: Feb 2012
Posts: 419
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From: Long Beach, MS
I would think that if you could run a high 13, then you got a slightly bigger cam, roller rockers, lighter valves, better heads and intake you could drop .5 off your et.
edit: Didn't they also get a better exhaust?
IDK though, I take all the stock times posted by various magazines with a grain of salt. There's so many variables, track prep, DA, driver, etc.
edit: Didn't they also get a better exhaust?
IDK though, I take all the stock times posted by various magazines with a grain of salt. There's so many variables, track prep, DA, driver, etc.
Last edited by fbody_brian; Dec 10, 2015 at 11:09 AM.
Friend of mine had a stock LT4 vette that ran 13.0 @ 112 with Drag Radials and 13.2 @ 110 on street tires. Dyno was 300rwhp. Not sure of torque. Seems on par with everything else written about it.
Not that I ever go by what R&T runs a car at but they ran a 96 GS LT4 to a 13.7. Throw a few more pounds on for a Fbody. Stock numbers are pretty on par w/ average LS1's. We know LS1's have but im pretty sure I heard of a few LT4's running high 12's stock,
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Ss rrr I wanna run a 13.2 @ 110 once my bolt ons are done in spring. I should be at least 290rw with full exhaust, tune, and ewp through an m6! Im tired of my low 14's!!!!! @ 101.
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It's been noted before that GM intentionally under-rated the LT4, having a good idea in 1996 what the 1997 LS1 was going to produce, and making DAMN sure it wasn't less than the previous (LT4) engine in the Vette!
It's typical for bone-stock M6 LT4 Vettes to put 300 SAE to the wheels.
It's typical for bone-stock M6 LT4 Vettes to put 300 SAE to the wheels.
So a lt4 camaro supp runs a 13.2 @ 109 with a 4.9 0-60 time according to tests. It was rated at 330hp.
No way having just 1.6 rr's lighter valves, slightly better flowing heads and a slightly bigger cam made it run that fast over a stock LT1.
To run that time and trap wouldn't it need to make at least 360+fwhp?
No way having just 1.6 rr's lighter valves, slightly better flowing heads and a slightly bigger cam made it run that fast over a stock LT1.
To run that time and trap wouldn't it need to make at least 360+fwhp?
so I see no reason to question the HP. I'm sure it probably has a slightly better torque curve too!Also, the LT4 knock module is known to add 30+ hp itself...
That was a popular mod back in the LT1 days. Wow the bs I use to read about it on Camaroz28.com 12 Second Club
Joined: Feb 2012
Posts: 419
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From: Long Beach, MS
I ran 13.76@104 with street tires and headers. 13.36@103 adding DRs, 12.9@105 adding rockers, but I'm at sea level.
What is the DA normally where you run?
Last edited by fbody_brian; Dec 10, 2015 at 02:51 PM.
Me too, but it is what it is. More than likely it was track prep that had something to do with it. This was 17 years ago so I don't rightly recall.
I'm gonna go ahead call BS on this wild 110 MPH trap speed claim 
....every publication I've ever seen puts them in the 103-106MPH range. The Corvette being the faster one of course. OP, please post a valid reputable link to a road test for this supposed 110MPH freak LT4....
Motor trend got 103 out of a Firehawk:
http://www.motortrend.com/news/1997-pontiac-firehawk/
Road and track got 105 out of a Grand sport:
http://www.roadandtrack.com/new-cars...e-grand-sport/
I don't see where an additional 5-7 MPH trap speed is coming from unless it's NOT stock or someone is lying...
....every publication I've ever seen puts them in the 103-106MPH range. The Corvette being the faster one of course. OP, please post a valid reputable link to a road test for this supposed 110MPH freak LT4....Motor trend got 103 out of a Firehawk:
http://www.motortrend.com/news/1997-pontiac-firehawk/
Road and track got 105 out of a Grand sport:
http://www.roadandtrack.com/new-cars...e-grand-sport/
I don't see where an additional 5-7 MPH trap speed is coming from unless it's NOT stock or someone is lying...
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Joined: Sep 2003
Posts: 442
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From: Raleigh, NC
Back in 2001 I drove a stock LT4 Corvette to 12.8@110. It was a fall day with cool dry air, so that may have had something to do with it. 108-110 seemed to be the norm for them back then.
Stock LT1 f-bodies were known to trap as high as 102 in good conditions.
Stock LT1 f-bodies were known to trap as high as 102 in good conditions.
lol... k.. years ago you would have been laughed off the forums for referencing magazing times as being anything significant, but since hardly anyone races anymore that's all you have... Magzines use correction factors for their times, they do not run on a prepped track, and there were piles of complaints years ago that they didn't know how to drive. Some of those magazines were also claimming the 96 SS when low 13's at 108 to mid 13's at 106 to high 13's at 102.
Before this becomes any more of a magical benchrace fest.
Most of the LT1 head porters don't like LT4s because material is already removed from the places they want it left..
The head flow thing it is what 15% bigger port for 13% more flow and more cam lift,roller rockers, more compression, bigger valves. Doesn't it beg the question why it ONLY made the extra power it did. I know some of you will claim the LT4 was underrated by like 50hp because you believe in the toothfairy.
Most of the LT1 head porters don't like LT4s because material is already removed from the places they want it left..
The head flow thing it is what 15% bigger port for 13% more flow and more cam lift,roller rockers, more compression, bigger valves. Doesn't it beg the question why it ONLY made the extra power it did. I know some of you will claim the LT4 was underrated by like 50hp because you believe in the toothfairy.
