LT4 Dyno Results
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Instructor
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From: Cumming Georgia
LT4 Dyno Results
My LT4 recently posted runs on a Dyno at about 300HP. Does anyone know what the factory HP specification was on this model at the back wheels or have comparable data for a stock LT4?
Team Owner
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From: Boston, MA
I have seen in person stock LT4s do 300-305 at the wheels. The facotry HP spec on paper is 330hp at the crank. It is an obvious lie that was made and all but confirmed by GM so that the early 345hp LS1s in the C5s wouldn't be outshined. :yesnod:
Race Director
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Re: LT4 Dyno Results (Ken Jarosz)
My LT4 recently posted runs on a Dyno at about 300HP. Does anyone know what the factory HP specification was on this model at the back wheels or have comparable data for a stock LT4?
Mine is the last on the list - it's stock except for Corsa exhaust and a K&N filter. Dyno read 308/308 in air thick enough to cut with a knife (85 degrees, 100% humidity). :D
Brad
Safety Car
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From: Austin, Singapore, Kuala Lumpur, Houston, Dallas, Hong Kong, Elgin, etc.. Texas
Re: LT4 Dyno Results (Ken Jarosz)
I highly recommend checking out http://www.lt4.com site. It really does a thorough job of detailing the LT4 engine.
Check out the link in my signature to my home page for graph of my LT4 before and after head porting.
Check out the link in my signature to my home page for graph of my LT4 before and after head porting.
Pro
Joined: Feb 2002
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From: Houston Tx
Re: LT4 Dyno Results (Ken Jarosz)
As all of these guys have said , there are some good resources for info on LT4's. I have seen roughly 10 stock dyno sheets on LT4's and the lowest I have seen was 285 and the highest was 305 with the VAST majority in the 295-300 rwhp range. This is almost identical to 97-00 LS1 dynos all throughout the rev range.
I have not put mine on the dyno yet (only had the car a short time) but will soon.......I expect around 295+.......... :seeya
I have not put mine on the dyno yet (only had the car a short time) but will soon.......I expect around 295+.......... :seeya
Team Owner
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From: Athens AL
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Re: LT4 Dyno Results (Ken Jarosz)
My LT4 recently posted runs on a Dyno at about 300HP. Does anyone know what the factory HP specification was on this model at the back wheels or have comparable data for a stock LT4?
Drifting
Joined: Jul 2000
Posts: 1,661
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From: Phoenix, Arizona
Re: LT4 Dyno Results (Ken Jarosz)
Mine dyno'd 306.7HP and 308.9TQ when it had: 62K miles, muffler elims + K&N w/open lid and no other mods. This was on a old (+/- 5 years) in-ground DynoJet on a 93 degree day with humidity of approximatley 30%. This did not correct for elevation of approximately 1,320 feet in Phoenix. So, I guess that's typical.
Racer
Joined: Feb 2001
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From: hialeah fl florida
Re: LT4 Dyno Results (Ken Jarosz)
my 92 Lt1 dyno 299hp and 333 rwt at mustang dyno.
zz9 cam shorty headers,tpis pipes whole no conv the claw intake ed wright chip rev to 6500rpm very flat torque 4100 to 6200 rpm is not a LT4 but it sounds good
[Modified by cesar, 11:12 PM 5/22/2002]
zz9 cam shorty headers,tpis pipes whole no conv the claw intake ed wright chip rev to 6500rpm very flat torque 4100 to 6200 rpm is not a LT4 but it sounds good
[Modified by cesar, 11:12 PM 5/22/2002]
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Thread Starter
Instructor
Joined: May 2002
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From: Cumming Georgia
Re: LT4 Dyno Results (rcolling)
Thanks for all the LT 4 Dyno results. Looks like mine is right there with all the others. Seems like all the commercial "wonder packages" like exhausts, filters, chips, etc. do not generate much improvement on the LT4 motor performance.
Le Mans Master
Joined: Mar 2001
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From: Modesto CA
Re: LT4 Dyno Results (Ken Jarosz)
I witnessed a 96 LT4 pull around 330rwhp and 300 and some change rwtq. It only had like..open air lid and Mufflers literally CUT OFF. Pretty damn impressive!
Team Owner
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Re: LT4 Dyno Results (Ken Jarosz)
They are great motors. :yesnod:
Burning Brakes
Joined: Nov 2001
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From: Houston TX
Re: LT4 Dyno Results (Ken Jarosz)
mine was bone stock when it pulled 282rw. upset with the result, i put a fresh air filter and plugs in it, and reset the ecm. it then pulled 291rw.
then i removed the maf screen, 291. then i cut the airbox lid open, 291. then i installed the magnaflow rear exhaust kit, 291, plus a whole bunch of drone.
at least my attention to detail makes for consistent dyno pulls!
[Modified by MSR, 9:27 PM 5/24/2002]
then i removed the maf screen, 291. then i cut the airbox lid open, 291. then i installed the magnaflow rear exhaust kit, 291, plus a whole bunch of drone.
at least my attention to detail makes for consistent dyno pulls!
[Modified by MSR, 9:27 PM 5/24/2002]
Safety Car
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From: Austin, Singapore, Kuala Lumpur, Houston, Dallas, Hong Kong, Elgin, etc.. Texas
Re: LT4 Dyno Results (rcdk)
:eek: :eek: Isn't that getting up into ZR1/Z06 territory?
Drifting
Joined: Jun 1999
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From: Garden Grove CA
Re: LT4 Dyno Results (rcolling)
rcolling, your dyno graphs show that something needs attention: either you are getting some spark scatter from a carbon tracked opti distributor cap, or you need some more fuel trim from about 4,200 rpm onwards
The LT4 is one of my favorite engines, many people mistake mine for an LT4 because I painted the intake, and added GrandSport emblems and hash marks to the exterior (people always say: "hey, I don't remember ever seeing a green GrandSport before").
Tomorrow is dyno tuning time for me again (I rented the dyno for two hours). I had an extra bung welded in ahead of the catalytic so that I can insert a wide band air/fuel ratio sensor, and I'll have a gas analyzer in the tailpipe. I'll be playing with LT1Edit, a self directed programming software program to work over the spark and fuel curves. I'm not expecting to see any real increase in top end power (although I'm not so secretly hoping to eclipse 370 rwhp). My main goal is to fatten up mid range torque - I really think that another 10 to 15 lbs of torque is in there waiting to be discovered. I'll report the results no matter which way they go.
Thomas
The LT4 is one of my favorite engines, many people mistake mine for an LT4 because I painted the intake, and added GrandSport emblems and hash marks to the exterior (people always say: "hey, I don't remember ever seeing a green GrandSport before").
Tomorrow is dyno tuning time for me again (I rented the dyno for two hours). I had an extra bung welded in ahead of the catalytic so that I can insert a wide band air/fuel ratio sensor, and I'll have a gas analyzer in the tailpipe. I'll be playing with LT1Edit, a self directed programming software program to work over the spark and fuel curves. I'm not expecting to see any real increase in top end power (although I'm not so secretly hoping to eclipse 370 rwhp). My main goal is to fatten up mid range torque - I really think that another 10 to 15 lbs of torque is in there waiting to be discovered. I'll report the results no matter which way they go.
Thomas
Le Mans Master
Joined: Aug 2000
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From: Corona CA
Re: LT4 Dyno Results (The Green Rocket)
rcolling, your dyno graphs show that something needs attention: either you are getting some spark scatter from a carbon tracked opti distributor cap, or you need some more fuel trim from about 4,200 rpm onwards
I had noticed the jags at higher RPM and wasn't sure what to do with them. I know I want to put a Fuel pressure guage on it. How can I check/clean the opti for carbon?