SAE corrected on a dynojet?
Question on LT4 Stock Dyno Numbers
Thread Starter
Racer
Joined: Nov 2006
Posts: 296
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From: NYC....In the Place to be!
Question on LT4 Stock Dyno Numbers
Hey Guys,
I'm just trying to figure out what the stock Dyno numbers would be on an LT4 motor.
My CE is my 1st vette and I can't wait until it gets nicer out here to take her out to a Dyno. I just wanted the stock numbers so I know what to expect.
thanks!
I'm just trying to figure out what the stock Dyno numbers would be on an LT4 motor.
My CE is my 1st vette and I can't wait until it gets nicer out here to take her out to a Dyno. I just wanted the stock numbers so I know what to expect.
thanks!
Melting Slicks
Joined: Oct 2006
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From: College Station TX
Race Director
Joined: Dec 2002
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From: SCMR Rat Pack'r Charter Member..Great Bend KS
Safety Car
Joined: May 2002
Posts: 4,659
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From: Toronto ontario
Every dyno is different. eveyr dyno can be played with. every dyno has different corrections. Every LT4 is 11 years old so my best guess is anywhere from 265-320.
The real truth is that they were slightly overrated from the factory so they DO put out 340-350 at the crank when NEW.
The real truth is that they were slightly overrated from the factory so they DO put out 340-350 at the crank when NEW.
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Michael S. Palmer
Le Mans Master
Joined: Jul 2000
Posts: 5,012
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From: OKC OK
Every dyno is different. eveyr dyno can be played with. every dyno has different corrections. Every LT4 is 11 years old so my best guess is anywhere from 265-320.
The real truth is that they were slightly overrated from the factory so they DO put out 340-350 at the crank when NEW.
The real truth is that they were slightly overrated from the factory so they DO put out 340-350 at the crank when NEW.
Instructor
Joined: Feb 2006
Posts: 156
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From: Ma.
Mine was close also. 298/310 on the 1st day, in june. The 2nd time I had it done was in March and 40 degrees in the shop. I ended up with 308/ 314. Same dyno but different temps.
Safety Car
Joined: Sep 2000
Posts: 3,524
Likes: 4
From: Hinckley Ohio
Most LT4's dyno around 290-305........but these are not usually BONE STOCK........usually they have cat-back, K&N, performance tuning....
My three pulls were between 292-299.......short of the magic 300...this was with cat back, K&N, etc.
so I modded & went for 400 & fell short again at 385...
True BONE STOCK is probably more like 280 RWHP
Whatever the hp, the LT4 is one fantastic car-----enjoy
My three pulls were between 292-299.......short of the magic 300...this was with cat back, K&N, etc.
so I modded & went for 400 & fell short again at 385...
True BONE STOCK is probably more like 280 RWHP
Whatever the hp, the LT4 is one fantastic car-----enjoy
Drifting
Joined: May 2005
Posts: 1,370
Likes: 1
From: Raleigh NC
When I bought mine, it made 304 rwhp and 305 rwtq with a catback, K&N, & a tune. This was SAE corrected on a 95 degree day with 78,000 miles on the car. With that setup, 4.10 gears, and drag radials, it ran 12.60 in the 1/4 at about 109mph.
Thread Starter
Racer
Joined: Nov 2006
Posts: 296
Likes: 0
From: NYC....In the Place to be!
Most LT4's dyno around 290-305........but these are not usually BONE STOCK........usually they have cat-back, K&N, performance tuning....
My three pulls were between 292-299.......short of the magic 300...this was with cat back, K&N, etc.
so I modded & went for 400 & fell short again at 385...
True BONE STOCK is probably more like 280 RWHP
Whatever the hp, the LT4 is one fantastic car-----enjoy
My three pulls were between 292-299.......short of the magic 300...this was with cat back, K&N, etc.
so I modded & went for 400 & fell short again at 385...
True BONE STOCK is probably more like 280 RWHP
Whatever the hp, the LT4 is one fantastic car-----enjoy
I hope you don't mind me asking, but what mods did you do to bring her up to 385 rear?
Instructor
Joined: Feb 2006
Posts: 156
Likes: 0
From: Ma.
Most LT4's dyno around 290-305........but these are not usually BONE STOCK........usually they have cat-back, K&N, performance tuning....
My three pulls were between 292-299.......short of the magic 300...this was with cat back, K&N, etc.
so I modded & went for 400 & fell short again at 385...
True BONE STOCK is probably more like 280 RWHP
Whatever the hp, the LT4 is one fantastic car-----enjoy
My three pulls were between 292-299.......short of the magic 300...this was with cat back, K&N, etc.
so I modded & went for 400 & fell short again at 385...
True BONE STOCK is probably more like 280 RWHP
Whatever the hp, the LT4 is one fantastic car-----enjoy
Race Director
Joined: Dec 2002
Posts: 13,348
Likes: 233
From: SCMR Rat Pack'r Charter Member..Great Bend KS
I've always felt that some mods, like certain exhaust systems, the K&N, and... especially... a "performance tune", can actually take away power. Your experience is only one of the reasons I feel that way.
Those GM engine guys may not be as dumb as we like to believe...eh?
Larry
code5coupe
Le Mans Master
Joined: Oct 2004
Posts: 5,841
Likes: 19
From: CLT, North Carolina
You can make a dyno read anything you want it to. Wouldn't it be tempting to cheat the correction a little if you were a tuner with a dyno looking for engine modification business?
Safety Car
Joined: Sep 2000
Posts: 3,524
Likes: 4
From: Hinckley Ohio
Well I have yet to win the Lotto-----not real lucky...so my experience??
However in the April 1997 issue of Corvette Fever they installed the Hypertech Power Programer on a stock 1996 Grand Sport. The horsepower went from 281.9 to 291.4.------so their stock LT4 did 281.9 rwhp
Also before I bought my B&B exhaust in Sept 1997 B&B sent me dyno testing they did on a stock LT4 in May of 1996. The horsepower went from 276.9 to 287------so their stock LT4 did 276.9 rwhp
I was trying to find the LT4 catback shootout article, would be another source of dyno testing..but I do recall all the catback systems tested added around 9-12 rwhp...B&B being the highest
Not sure what to think.........
Last edited by LT4BUD; Mar 8, 2007 at 03:39 PM.
Race Director
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From: N. Alabama
Burning Brakes
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