Has anyone seen a increase in gas mileage with a Superschips Microtuner or HPP? I have a customer with a 2000 Z71 5.3, wanting to improve his mileage a little. Also, any solid power gains?
TIA

Albert

 

Testing completed....

First off the HPP3 results:

The first three passes of the day were to get some solid baseline numbers.

Peak RWHP N/A: 278.2
Peak RWTQ N/A: 318.0

The next three passes were after HPP powertuning was installed. The power tuning for 93 octane was used along with 160* stat.

Peak RWHP N/A: 291.2
Here's a clip from a previous post:

Peak RWTQ N/A: 325.4

Final analysis:

13 RWHP
7.4 RWTQ

The power was made evenly across the entire tested curve and even opens up some above 4700 rpm.

HPP3 = worthwhile mod

Richard

 

We gained the most gas mileage with the UPD intake plus .2 in the 1/4 mile..

only drawback is some of the older folks say its too loud

 

No increase here.

 

The best mod for me was the HPPIII. Just changing the shift points, rev limiter, and shift firmness made a big difference. I think if you do a search on here, fsc or Ls1.com some of the guys have recorded a .4 improvement in their 1/4 mile times. I haven't been to a track but I can definetly feel the difference. When I first got the Yukon I averaged 16.0 MPG city/highway. And now with the mods I get 17.5 MPG city/highway. This includes the HPPIII, Flowmasters, UPD, TBS, Pullies, and free mods.