Big Difference in Dyno Numbers
(updated) Big Difference in Dyno Numbers A few months ago I had a TR224 114 cam installed and dynotuned on a Dynapak system. The numbers then were 385rwhp/381rwtq.
Just this past weekend I dyno'ed on a Dynojet machine, just curious to what the difference would be. To my surprise (and everyone there) my numbers were 353rwhp/353rwtq.
So, there is about a 30HP difference (10%) between the two. From what I've heard, the difference shouldn't be that big. There was another guy there that "lost" 40hp from a Dynapak to a Dynojet.
I am going to have the shop with the Dynapak re-dyno my car to make sure nothing is wrong with it.
My question basically is: What "should" my car dyno, given my mods?
2002 Camaro SS (M6)
SLP LT
SLM Loudmouth
ASP pullies
TR224 114 cam
Whisper lid
street tune
Just this past weekend I dyno'ed on a Dynojet machine, just curious to what the difference would be. To my surprise (and everyone there) my numbers were 353rwhp/353rwtq.
So, there is about a 30HP difference (10%) between the two. From what I've heard, the difference shouldn't be that big. There was another guy there that "lost" 40hp from a Dynapak to a Dynojet.
I am going to have the shop with the Dynapak re-dyno my car to make sure nothing is wrong with it.
My question basically is: What "should" my car dyno, given my mods?
2002 Camaro SS (M6)
SLP LT
SLM Loudmouth
ASP pullies
TR224 114 cam
Whisper lid
street tune
Last edited by SnakeStomper; Nov 2, 2005 at 02:37 AM.
Staging Lane
Joined: Apr 2002
Posts: 62
Likes: 0
From: Artesia, NM
For your mods your first numbers 385/381 seem pretty dang close to me. It looks like your only real power mods are cam/exhaust and lid, and your car should have already been making about 300rwhp stock.
Originally Posted by GTO_Scott
What was the correction used on both runs, if any? (SAE, STD, none)
SAE for both.
Yeah, my only power mods are real the cam+exhaust+tune. I'm having my car re-evaluated by the shop that did the original dyno and tune, to see if everything is ok... meaning, I didn't dyno lower due to some car issues. We'll see.
Well, went back to the shop where I originally Dyno'd and my my #'s
were 357hp/357tq
So, on the same dyno where I had seen 385/381 four months prior, I had lost 30hp.
The only thing that was apparently different from the original run, was that my PCM voltage was down about 1V. He also mentioned that the alt. and crank belts seemed somewhat loose. I will be going back next week for more evaluation.
Any opinions?
were 357hp/357tq
So, on the same dyno where I had seen 385/381 four months prior, I had lost 30hp.The only thing that was apparently different from the original run, was that my PCM voltage was down about 1V. He also mentioned that the alt. and crank belts seemed somewhat loose. I will be going back next week for more evaluation.
Any opinions?
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Originally Posted by jbs02somws6
What valve springs and lifters are you running? Can you post some dyno graphs comparing the runs?
I have Comp Cams 918 Valve Springs and stock lifters.
I'll see if I can get him to email the graph of the two plots ...
dyno numbers dont mean **** anyway, as long as nothing is wrong with the car, then why care about the lower number if the performance is no different. Take it to the track and get some timeslips. Just make sure those valve springs are OK cause they can cause power issues if they are jacked up.