Dyno Testing SS Engine??

[S/ST 3040]

Where in the RPM range would you concentrate on getting the most out of the engine?
Would you want to see a higher average torque from peak torque to 1-2 shift or a higher
average from peak torque to finish line RPM?


How much HP or TQ would be considered significant? Hypothetically, you advance the cam 3º
from one pull to the next and it picked up 6 ft/lbs at 5600 RPM but, lost 4 HP from 7300-8200,
is that a good tade off?

[Glenn Briglio]

Got to see the entire dyno sheet. Also where the engine operates in the car.

[S/ST 3040]

The engine is coming out of the car for a few updates and has not made it to the dyno yet.
My example/question was hypothetical. The engine is a low compression 340 and RPM
range is from converter to 8400-8700, depending on the air. 1-2 shift is 7600 and 2-3 shift
8200.


I'd just like to know what I need to look for when I get some data.

[Mike Taylor 3601]

I concentrate on average tq.hp. #'s,I do that because if you are more focused on peak numbers you are more likely to miss small gains,many time you make good gains at the peaks, but lose below or above peaks and end up not really making car faster.
you can't move peaks around much without making air flow or cam changes.
Mike Taylor 3601

[Adger Smith]

If it doesn't pull off the gear change it will be a slow puppy.

[Ed Wright]

Originally Posted by Adger Smith

If it doesn't pull off the gear change it will be a slow puppy.

I'm with Adger, that's what I have seen. I found more ET improvements working on torque at the RPM mine falls back to on gear changes, and where my converter hits. If you have not run it in the car, I'm not sure how you would know where to work. The rest of it seems to be for MPH. Compared to what I found at the track before the dyno, I gained almost an expensive tenth. Fun day though.

[S/ST 3040]

I suspected torque from converter fall back, up to shift points was the best RPM range to concentrate efforts.


Any estimation of how small of gain would be noticeable on a time slip? e.g. Would an average of 5 ft/lbs from
5400-7000 even show up? Less?
Thanks for the responses.

[Lenny5160]

Originally Posted by S/ST 3040

Any estimation of how small of gain would be noticeable on a time slip? e.g. Would an average of 5 ft/lbs from
5400-7000 even show up? Less?
Thanks for the responses.

It all depends on where you are in the HP spectrum. At low HP, 100 more will make you a couple seconds quicker. At high HP, 100 won't get you a tenth.