Got a dyno appointment tomorrow morning. The truck is an 03' 2500HD 4x4, 6" lift 325/65/18's, 6.0L (stock internals), 4L80, 4.10 rear, 9PSI Procharger, stock injectors, Procharger supplied FMU, and Procharger specific Fast Chips tune. What should I expect at the wheels? Should be about 75 deg and 30-40% hum.

My main reason for the run is to check the following

A/F ratio
Injector Duty cycle
Timing Map

I am sure that the shop will know what all to check and expect, they also do tunes and are expecting that the A/F is lean, the injectors are probably maxed out and the tune is probably very conservative timing wise. They are already suggesting larger injectors, delete the FMU and tune it again. So far I have put on 12,000 miles w/ the blower, I've done a lot of towing and had zero trouble so far. Comments?

 

Geeze.... I'm thinking a conservative 350hp?

Not to get way off subject, but how do you like that S/C for towing duties?

 

yeah I am thinking upgrading to 43lbs injectors getting rid of the fmu and doing a custom tune I could see you up words of 380-400 to the wheels if these guys are really good tuners. good luck I wish I had a tuner here

 

Only 350?? Well, I guess at the wheels maybe. I will definetely be posting the results.

As for towing it's about what I expected, I tow a 4500lb boat, it's a little soft on power below 3,000rpm (only 3-4 psi) but still more than makes up for the big tires, and really comes alive when the RPM gets up and the boost builds, It tows a gear higher and at the speed limit on every hill I've thrown at it and we got some doosies around here. I really wanted the Radix for the low end torque but it was big $$$ and still pending CARB approval when I bought the Procharger, Whipple didn't offer an intercooler for the 6.0L which I really wanted, and the Procharger seems to be the easiest to return to stock if I sell the truck as it is a truly an easy bolt on kit. It's probably not the best kit for towing but it is working well for me. The true test will be when I hook up the 8500lb 26ft travel trailer I just bought, I got a bad feeling that I will be at the dealer looking at D-max's very soon, if so the procharger will then go on the 04' Hoe if I can talk the woman into it.

 

Cool... I ran a 220/220 cam in my truck, and pulling 5,000lb wasn't all that fun. It lost power around the 2K range, so it took a lot of pedal to get around.

Yeah, I was being real conservative on the 350 guess. I'd expect the 4L80 and the bigger tires would pull the HP rating down a fair amount...

 

Your conservative guess was pretty much right on the money, looks like the big (35") wheels killed it, was only able to make the runs in 1 & 2nd gear as 3rd hit the speed limiter, made three runs but deleted the 3rd due to power being way down (intercooler was hot) the peak HP and TQ look great until you realize that they are just the shifts. Looks like max power in 2nd gear was about 330HP and 360TQ. So now anybody care to convert this to FWHP? The A:F was kinda scary, all over the place, but overall a little lean.

 

Yea it looks like those 35's killed it. but good numbers.