Think of it this way, if there was a way to make a vehicle more powerful and
more fuel efficient without accecting emissions, don't ya think the
automaker would have figured it out in the YEARS they spent designing the
My experience with an HPP3 was on a 98 Z28. I liked the tranny and
speedo correcting adjustments, but the tunes all produced pinging even
when running 93 octane so I ended up not using the tunes ... and I
actually seemed to get the most performance with a replacement air
Now I have a DiabloSport Predator for my 01 Tahoe (DiabloSport emailed
a custom tune for free) which has more options. I think to get the
most out of any aftermarket tuner you should probably also do other
mods (ie, freer-flowing exhaust, headers, intake/air box, etc) but
even if you don't do all that some of the other options are nice to be
able to control.
I think you will find lots more info over on the Light Duty forum at:
http://www.gm-trucks.com/forums/ ... (search for HPP3, Predator)
Well I think if your truck is stock you are not really going to be
able to tell much difference by adding one of these programmers or
in the old days changing the chip.
I do believe on some of the diesel trucks you can get some real power
gains by using a device like this.
The basic rule is that as HP increases fuel economy decreases....
I think you'll find that if you are looking for some real gains in HP
it will take some additional modifications to either aid in fuel
delivery or air...
On a gas engine I would not place much value on just changing the
computer chip or the programming. of the chip. If you were willing to
invest in some additional modifications along with the chip then I
would go for it, otherwise I would not use one.
Just my view, I'm sure you'll have some different responses.
remove the ** to email
These hand held units are good to change shift points and firmness, correct
for different tire sizes, and remove rpm and speed limiters and they are
easy to use. Depending on the truck you will not gain much power.
If you want more power, ( yes doc it can be done :-), you need to get a
tune. Just by removing TM (torque management) you will feel a noticeable
difference. Power gains will come from modifying the fuel trim levels and
smoothing out timing curves. This will cost more $450 and you will need to
swapout your PCM. (if you don't do the tune yourself)(hptuners.com)
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