Went to Futral Motorsports yesterday for my dyno-tune. I didn't get chance to put on the ASP Crank Pulley. I took my g/f with me and she had to be back at a certain time so, time was limited.

Here is the chart:


The Blue is run through the full exhaust. The Red is with the cut-outs open! The cut-outs were worth 15rwhp/10rwtq across most of the powerband. Peak #s were a little less than I was expecting. But, I'm still running the stock cats through a full true dual exhaust, truck intake, and stock pulley. I think this is still pretty good considering these restrictions. BIG thanks to Allan Futral who worked his magic! He has been a tremendous help and his customer service is top notch! The first dyno was 341rwhp and the final numbers were 367.85rwhp/365.68rwtq through the cats and 382.2rwhp/376.19rwtq through the cut-outs. Allan told me he wished I could stay so he could mess with it a little bit more, but my g/f had to be back in town by 6:00 and it was a 4 hour drive. I told him my plans about a LS6 intake and bigger stall (running a stock stall) and he seemed to think those would make nice difference.
When I go back in the summer, I plan to have:
-Magnaflow Ceramic Cats
-ASP Crank Pulley
-LS6 intake
-Yank 2600/3000 installed at FMS

I'm very impressed with numbers I've gained 96rwhp/86rwtq from the cammed 5.3 set-up and lots more uner the curve.

 

Very nice!
Amazing the difference the cutouts make above 5000 rpm.

 

nice numbers

 

Nice!

 

I would have expected a bit more too, but maybe the intake will open it up a bit, a looser stall will drop dyno numbers too. But Im not much of a dyno racer, get that thing to the track

 

I would say wihtt a vicjr or ls6 you are going to atleast gain 20rwhp and a lprobably 5rwhp out of the pulley if not more.

you can add this dyno chart to the list of other ones that proves the truck intake is DEAD at 5500+

 

that is extremely low man. you should be well into the 400 range even with your restrictions. but congrats

 

what is your compression on that? is that with stock exhaust manifold too?

 

Thanks guys.

 

Exactly 11.13:1

I'm running LaPole Mid-length headers with 1 3/4" primaries.

The pulley/fan swap netted me 16rwhp/6rwtq in my cammed 5.3. I think the pulley usually gives 8-10rwhp.

Also, these pulls were in 2nd gear and stock size tires (255/70/16). He did a 3rd gear pull and it put down 374rwhp through the full exhaust.

With a 20% drivetrain loss, I firgured It's making 478/470 at the flywheel.