Hot Off The Dyno!

[PatrickCampbell]

Well I went on the dyno today at Carlisle with my only power mods being a 4" exhaust and an Edge EZ, this is on an SO truck, not HO.



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and finally:



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275 RWHP / 515 RWTQ



This is pretty much right on with what I was thinking I'd get... just a little bit more... So I am very happy!!!



I was expecting about 250 RWHP / 500 RWTQ.



Next power mods... Injectors?

 

[swexlin]

I'm sorry I didn't get to see you dyno; must have been when I was drooling over some the old iron.



Andy (Hammer) inquired, but since they wanted $100. 00, he declined.



Good numbers.

 

[rbattelle]

That's a strange dyno curve. First of all, you went WAY beyond redline to almost 3600 RPM. Secondly, you're not making any real torque until about 2400 RPM... I thought peak torque was about 1400 RPM? It seems as though you traded off torque and horsepower in the useful RPM band for higher torque and horsepower in a less useful RPM band. Is that normal? I suppose everything in life is a tradeoff.

 

[JARichard]

Patrick,

What size tires? Gear Ratio? And how did you manage to turn 3600 RPM?

 

[DavidTD]

Originally posted by swexlin





Andy (Hammer) inquired, but since they wanted $100. 00, he declined.



Good numbers.

Must be time for me to have a price increase...

 

[PatrickCampbell]

I have 3. 73s with 245/70/19. 5's. That shouldn't make a difference on the power though!



I'm pretty sure he didn't rev to 3600 RPM. The RPMs are probablly way off on the chart because the truck definitely makes tons of torque below 2000 RPM.



I don't know how they get the RPMs on a diesel but they were having some troubles hooking it up. These are probably "precise" but not "accurate".



That should've been my basis for not paying the $100 (he informed me about the price increase AFTER the dyno was done... but I didn' twant to make a big stink, we were all having a good time and despite the RPM chart being skewed, I was happy with the HP/TQ #'s).

 

[KLockliear]

Typically you can get the trucks to stay locked up and in OD from a lower RPM, but he was basically trying to ensure it would do just that. Looks like the operator started at roughly 2100rpm.

 

[Gary - K7GLD]

Andy (Hammer) inquired, but since they wanted $100. 00, he declined.



My last local dyno runs at Ken Imlers in Sacramento were 3 runs for $60 as a weekend group activity as I recall - if the price gets much above that, I'll probably steer clear myself - unless significant power mods have been done since last dyno runs, it's more of an ego thing with group anyway - all fun enough at reasonable cost, but not when ya start getting into the high $$$...

 

[PatrickCampbell]

Originally posted by KLockliear

Typically you can get the trucks to stay locked up and in OD from a lower RPM, but he was basically trying to ensure it would do just that. Looks like the operator started at roughly 2100rpm.

If he really did run 2100 to 3600 RPM, it's not very helpful to me. My truck spins 2000 at 75 MPH in OD... I'd like to know my power from 1600 to 2200 RPM, of course it's interesting to see the rest of the curve but above 3200 RPM not only do I not care about, I don't want my engine running at those speeds either!



This was the first time I'd ever dyno'd anything and it was for entertainment value more than anything...



But if there is a next time, what gear is best to test in?



Not too famiiar with how these trucks work but can I cut power to the TCU?



Would that force TC lock up and give me manual selectable 1st, 2nd and 3rd?