Got some preliminary dyno results.
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TECH Junkie
Joined: Nov 2001
Posts: 3,987
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From: Melbourne, FL
Got some preliminary dyno results. So far so good, but the PC that runs the dyno is having some issues. It will have a new hard drive in it by tomorrow afternoon, and we'll resume testing (I left the car there overnight).
The initial results actually look pretty good. A/F ratio stays steady, and sits right at 12.6:1 or so. We played with the fuel pressure, and picked up a little hp in the midrange, but lost a little up top. I need to figure out just what to change in LS1Edit to richen her up just a tad around the torque peak. We've been doing our pulls up to 7500rpm, and it looks like the peak power is between 7300-7400rpm. I played with the timing a little, going from the 29deg I've always run up to 31, and found a little gain in the midrange, but none up top. I think I can get a little more out of the car with some more tuning, but everything is pretty close as is.
As far as hp numbers, you can take them for what they're worth. There is no way to correct the numbers to standard condition with this particular machine, and it's hot as hell here in Florida. Also, everyone says that the eddy-current dyno reports a lower number than a dyno-jet. That being said, we're right at 470hp @ the wheels at peak, and the curve flattens out from there. We have not run it high enough to see where it really starts to drop. All the runs have been on my 28" slicks @ 15psi, and through the mufflers w/the Holley air filter in place. I would speculate the numbers would be a little higher on a Dyno-Jet, but I could care less about numbers. I just want to find an improvement over my initial baseline...
I don't have any torque figures, as for some reason they just aren't coming out correctly (they're waaaay down, like 300rwtrq or so).
We're going to play with a few more things and finish up tomorrow afternoon / evening.
The initial results actually look pretty good. A/F ratio stays steady, and sits right at 12.6:1 or so. We played with the fuel pressure, and picked up a little hp in the midrange, but lost a little up top. I need to figure out just what to change in LS1Edit to richen her up just a tad around the torque peak. We've been doing our pulls up to 7500rpm, and it looks like the peak power is between 7300-7400rpm. I played with the timing a little, going from the 29deg I've always run up to 31, and found a little gain in the midrange, but none up top. I think I can get a little more out of the car with some more tuning, but everything is pretty close as is.
As far as hp numbers, you can take them for what they're worth. There is no way to correct the numbers to standard condition with this particular machine, and it's hot as hell here in Florida. Also, everyone says that the eddy-current dyno reports a lower number than a dyno-jet. That being said, we're right at 470hp @ the wheels at peak, and the curve flattens out from there. We have not run it high enough to see where it really starts to drop. All the runs have been on my 28" slicks @ 15psi, and through the mufflers w/the Holley air filter in place. I would speculate the numbers would be a little higher on a Dyno-Jet, but I could care less about numbers. I just want to find an improvement over my initial baseline...
I don't have any torque figures, as for some reason they just aren't coming out correctly (they're waaaay down, like 300rwtrq or so).
We're going to play with a few more things and finish up tomorrow afternoon / evening.
Re: Got some preliminary dyno results. Your numbers are not out of line for what you have.
Last year I ran an ARE 422 SR, TH350, 4600 stall, 9in yada, yada. I pulled 470hp and 400rwt on an eddy current dyno as well. I was only spinning the motor to 6700 and making peak power at 6400. I am amazed you are able to make that kind of power at that rpm. I ran 10.6 @ 126 with a 1.47 60ft off the t-brake. I weighed in at 3590 w/me in it. On a dyno jet you would easily exceed 500rwhp.
Tom
Last year I ran an ARE 422 SR, TH350, 4600 stall, 9in yada, yada. I pulled 470hp and 400rwt on an eddy current dyno as well. I was only spinning the motor to 6700 and making peak power at 6400. I am amazed you are able to make that kind of power at that rpm. I ran 10.6 @ 126 with a 1.47 60ft off the t-brake. I weighed in at 3590 w/me in it. On a dyno jet you would easily exceed 500rwhp.
Tom
TECH Fanatic
Joined: Nov 2001
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From: Katy, TX
Re: Got some preliminary dyno results. I agree George... I suspect you'd be knock'n at 500rw on a dyno jet, if not over it. Very Bad-***!
From what I understand...which ain't much. Those type of dyno's are better for tuning, since they give a better representation of the load the cars will see at the track. I don't know maybe I was told wrong.
Good luck man...I'm thinking you'll be reporting a new best very soon!
From what I understand...which ain't much. Those type of dyno's are better for tuning, since they give a better representation of the load the cars will see at the track. I don't know maybe I was told wrong.
Good luck man...I'm thinking you'll be reporting a new best very soon!
Re: Got some preliminary dyno results. George,
Get that bad boy tuned up and bracket race the crap out of that thing. <img border="0" title="" alt="[Razz]" src="gr_tounge.gif" />
Good luck to ya. <img border="0" alt="[angel]" title="" src="graemlins/gr_angel.gif" />
Coach
Get that bad boy tuned up and bracket race the crap out of that thing. <img border="0" title="" alt="[Razz]" src="gr_tounge.gif" />
Good luck to ya. <img border="0" alt="[angel]" title="" src="graemlins/gr_angel.gif" />
Coach
TECH Senior Member
Joined: Nov 2001
Posts: 10,341
Likes: 1
Re: Got some preliminary dyno results. You would be over 500RWHP no problem on a dynojet. Probably in the 525RWHP range.
Great numbers on slicks!! hehehe
Cheers,
Chris
The cool thing is you can really load the car on the Eddy current dyno giving a much better representation of what you would actually run on the street/track in terms of load.
Great numbers on slicks!! hehehe
Cheers,
Chris
The cool thing is you can really load the car on the Eddy current dyno giving a much better representation of what you would actually run on the street/track in terms of load.
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On The Tree
Joined: May 2002
Posts: 136
Likes: 0
From: Jax, FL
Re: Got some preliminary dyno results. Ok cool, I had my car there with the NFFB guys about a month ago. The torque numbers were off for everyone. We knew it would read lower than the Speedcraft DynoJet.
On a car that dynoed 358/340 at SC, it made 340/307 at Dyno-tune. For tuning, the machine could be great.
Anyhoo, glad to hear your car is up and running. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
On a car that dynoed 358/340 at SC, it made 340/307 at Dyno-tune. For tuning, the machine could be great.
Anyhoo, glad to hear your car is up and running. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
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