i have a '99 5.3 L w/ K&N GENII, Borla Powerset Dual Exhaust, and a HPP3. i was at hypertech's website and they said that the HPP3 works best or is calibrated for stock or near stock trucks (e.g. air intake, exhaust). any more mods that influence air flow like MAF sensor or headers, the HPP3 will require new tuning. has anyone had their HPP3 re-tuned due to additional mods on their truck, and if so, where did you get it done and how much did it cost? i invested $300 on my HPP3 and i hate to spend any more money on additional mods that may make the HPP3 worthless. what additional mods can i do to increase HP without getting the HPP3 re-tuned?

 

I think you're set up pretty good for the tuning. About all I have that you don't is a 180° thermostat and a Granatelli maf that's calibrated for the cold air intake. One thing you can do if you haven't yet is retune your shift points up to around +3 for 1-2 and +10 for 2-3. Then set your rev limit to 6200 so you never have to worry about bumping into it.

 

ya, i already have it tuned for +3, +10, but my rev lim is set for 6000. should i go to 6200?
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Well if you haven't felt the limiter yet then I wouldn't worry about it too much. Mine sputtered on me once or twice after kicking up the shift points so I just bumped mine up to fix all that.

<small>[ February 17, 2003, 06:15 AM: Message edited by: JWRENCH ]</small>