Interesting LT4 Horsepower Article.
Thread Starter
Racer
Joined: Jan 2002
Posts: 419
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From: Tampa FL
Le Mans Master
Joined: Jun 2002
Posts: 6,097
Likes: 2
From: Cincinnati Oh
Re: Interesting LT4 Horsepower Article. (MaddMaxx)
Yep, its been posted here before, but is interesting. Some forum members have posted very good stock rwhp numbers over 300. One of the reasons the LT4 owners love these things.
Race Director
Joined: Oct 2002
Posts: 10,864
Likes: 196
From: Southern CA
Re: Interesting LT4 Horsepower Article. (StealDads67)
I've owned several "fast" sports cars, but this is the first one that makes me "double check" everything before I mash the gas. You gotta respect the power of the LT4 engine. :yesnod:
Safety Car
Joined: Sep 2000
Posts: 3,524
Likes: 4
From: Hinckley Ohio
Re: Interesting LT4 Horsepower Article. (MaddMaxx)
I still can't help but thinking 390+ horsespower on a STOCK as is from the factory LT4 is plain and simple BS!!!!!!
First from what I see they never measured engine hp, they apparently measure rwhp and apply correction factors to come up with theoretical engine hp.
If I a found a stock LT4 cranking 392hp I would sure tear into to it to find out why. Exactly which mfg variable gave this result??? Even if the plant slipped in a hot cam I doubt if this would give 392.
So what is in these 390hp STOCK LT4??
They do say as delivered from factory, which means stock exhaust, intake, timing etc..
I love my LT4, but I still think.....Why didn't mine make 392hp?????
First from what I see they never measured engine hp, they apparently measure rwhp and apply correction factors to come up with theoretical engine hp.
If I a found a stock LT4 cranking 392hp I would sure tear into to it to find out why. Exactly which mfg variable gave this result??? Even if the plant slipped in a hot cam I doubt if this would give 392.
So what is in these 390hp STOCK LT4??
They do say as delivered from factory, which means stock exhaust, intake, timing etc..
I love my LT4, but I still think.....Why didn't mine make 392hp?????
Race Director
Joined: Apr 2000
Posts: 15,344
Likes: 4,009
From: Texas
Re: Interesting LT4 Horsepower Article. (LT4BUD)
I still can't help but thinking 390+ horsespower on a STOCK as is from the factory LT4 is plain and simple BS!!!!!!
Drifting
Joined: Jul 2000
Posts: 1,661
Likes: 4
From: Phoenix, Arizona
Re: Interesting LT4 Horsepower Article. (LT4BUD)
:iagree: The BS alarm should be going off loud & long.....
My LT4, when stock, did 305.6 HP & 309.1 TQ at the rear wheels. I've only seen a couple that did "slightly" better stock and a lot that were in the 285-295 range. People pay big $$ to achieve LT4 figures in the 390HP and 400TQ range. :flag
My LT4, when stock, did 305.6 HP & 309.1 TQ at the rear wheels. I've only seen a couple that did "slightly" better stock and a lot that were in the 285-295 range. People pay big $$ to achieve LT4 figures in the 390HP and 400TQ range. :flag
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Melting Slicks
Joined: Aug 2000
Posts: 2,925
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From: Dover NH
Re: Interesting LT4 Horsepower Article. (NavyVet)
I wonder if all the numbers used were SAE corrected? We should all always report SAE numbers so there is no confustion! :)
Those LT4s look to put out some good #'s, hell my 100% stock 90' Z isn't to far ahead with 332hp. The curves will look different though.
Whats the highest known (othere than that website) known 100% stock (no hot cam, exhaust etc) LT4 SAE corrected RWHP?
Those LT4s look to put out some good #'s, hell my 100% stock 90' Z isn't to far ahead with 332hp. The curves will look different though.
Whats the highest known (othere than that website) known 100% stock (no hot cam, exhaust etc) LT4 SAE corrected RWHP?
Pro
Joined: Feb 2002
Posts: 744
Likes: 1
From: Houston Tx
Re: Interesting LT4 Horsepower Article. (MaddMaxx)
After owning one for a while now and seeing several dyno and having seen many dyno sheets online, the vast majority make between 290 and 300 rwhp. Very few seem to be less than 290 and I have seen several make over 300 but not much more. I dont know where they got those hokey numbers but.......
Racer
Joined: Mar 1999
Posts: 423
Likes: 0
From: Austin Texas
Re: Interesting LT4 Horsepower Article. (MaddMaxx)
I'm with ya, somethin' a'int right with those variations. Mine did
298hp and 30x torque I can't even remember. (Stock except for
open K&N.) I've never seen anyone post results higher than just
over 300 either.
Have a good'un.............MickyD
298hp and 30x torque I can't even remember. (Stock except for
open K&N.) I've never seen anyone post results higher than just
over 300 either.
Have a good'un.............MickyD
Advanced
Joined: Jun 2003
Posts: 63
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From: san antonio tx
Re: Interesting LT4 Horsepower Article. (MaddMaxx)
Wave the BS flag. I have been dynoing and modifing for about 3 months now. Started out at 298 rwhp. am now up to 363rwhp on the motor. Mods are Hot cam, 52MM TB, Adj fuel pressure reg., SLP Claw, EM longtubes, Corsa Cat back with high flow Cats. When I spray NX 100 shot the rwhp goes to 448 and rwtq is 520. Sooooo with all these mods. and these results I say raise the BS flag on 390 rwhp STOCK.
Burning Brakes
Joined: Apr 2001
Posts: 994
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From: Jamison PA
Re: Interesting LT4 Horsepower Article. (owen lancaster)
Wave the BS flag. I have been dynoing and modifing for about 3 months now. Started out at 298 rwhp. am now up to 363rwhp on the motor.
Race Director
Joined: Feb 2003
Posts: 18,484
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From: Everyday you must choose between the pain of discipline and the pain of regret. Fredericktown, OH
Re: Interesting LT4 Horsepower Article. (sothpaw2)
They are not claiming 390 rwhp, but rather 390 flywheel hp. I still agree even that is :bs
Mine with the mods in my sig made 305.x hp and 315 torque.
Le Mans Master
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From: DrunkDefender
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Re: Interesting LT4 Horsepower Article. (MaddMaxx)
Mine put down 316rwhp and 312 rwtrq (corrected) with only a drop in KN filter.
Burning Brakes
Joined: Oct 2000
Posts: 897
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From: My Own Private Idaho
Re: Interesting LT4 Horsepower Article.
I suspect there is more variance in the dyno testing process/equipment/personnel that in the LT4s themselves. :yesnod:
[Modified by tailgunner, 3:23 PM 12/11/2003]
[Modified by tailgunner, 3:23 PM 12/11/2003]
Melting Slicks
Joined: Aug 2000
Posts: 2,925
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From: Dover NH
Re: Interesting LT4 Horsepower Article. (TheStef)
Very cool!
Did any one ever do something like this with the L98?
Did any one ever do something like this with the L98?
:cheers: