2nd Gen Non-Engine/Transmission 1st Dyno run today

[SKargo]

I'm not pleased with these numbers. I'd of thought they'd of been substantially higher.

They had a hard time picking up my RPM signal. I made a few "test" runs.

Then they based it on MPH? I do not undertsand how that works, as this was my first time.



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[PC12Driver]

Your numbers look pretty close to a truck with just an EZ. The Scotchlock that comes with the Comp to tap the pump wire is notorious for not making a proper connection. Without a good connection the Comp will behave just like an EZ, but the extra kick you get from tapping the pump wire (levels 2 through 5) won't be there. Make sure you've got a good connection there and I bet you'll find your problem.



You can base the graph on MPH or RPM, that's a choice you get when you print out the graph. So they just decided to give you MPH. Apparently they did have the RPM pickup working, since you have a torque readout (which I believe is needed on a Dynojet for torque output).

 

[SKargo]

Your numbers look pretty close to a truck with just an EZ. The Scotchlock that comes with the Comp to tap the pump wire is notorious for not making a proper connection. Without a good connection the Comp will behave just like an EZ, but the extra kick you get from tapping the pump wire (levels 2 through 5) won't be there. Make sure you've got a good connection there and I bet you'll find your problem.



You can base the graph on MPH or RPM, that's a choice you get when you print out the graph. So they just decided to give you MPH. Apparently they did have the RPM pickup working, since you have a torque readout (which I believe is needed on a Dynojet for torque output).

I used a posi tap, and even rechecked today, it's secure.



They had big issues with picking up my rpm, and TOLD me they had to base mine off of MPH.

 

[PC12Driver]

If you can get back on the dyno, try level 1 vs. level 5 on the Comp (keep the same sub level though - that'll help with consistency). Then you can see quickly if the wire is tapped. There should be a major jump in HP. Or just take a couple of runs down the road on 1x5 and a couple more on 5x5 (again, same sub level), and watch your pyro. If you're getting the extra fueling on level 5, your egts will be substantially higher (200-300* easily). If the Comp is the only HP mod on your truck, then your numbers are exactly what they would be if the wire wasn't tapped (bad tap, bad/wrong wire pierced, bad box, whatever). Just having the Posi Tap screwed down doesn't mean it's making metal-to-metal contact; the tap may have pulled some insulation in with it.



The rpm thing is odd, since all they're doing is using an "eye" to watch a piece of reflective tape on your balancer. The only trick is getting the eye lined up with the tape. And the last time I was on a Dynojet, I couldn't get a torque reading on the first run because the optical sensor fell off. You have torque numbers, so I'd say they probably we're getting the info. How experienced is the shop in dynoing diesels?



Something that does look odd is the 85mph bump in your graph. That shouldn't be there. The only dyno run that I have with bumps is the one with a bad pump wire connection (it actually looks like shift points on the graph). But I suppose that could also be trans/clutch/tire slippage. But other than that, your graph could just about overlay an EZ-only dyno sheet.

 

[csutton7]

what injectors do you have???... ... chris

 

[Beast2B]

tire size? gear used for dyno run? put some more info in your sig, it'll help with this as well as other diagnostic stuff. auto/manual, tire size, gear ratio, etc.

 

[DLausche]

You are right. Something is not right there. FWIW, my truck with just the Comp and everything else stock dyno'd at 329HP and around 750ft/Lb.

 

[SKargo]

I used 3rd gear for the dyno runs, with the tc locked up.

Tire size is 285/75/16 with 3:55's. Guess I'll retap the wire and see what's doin.