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How long you had the Heath program, his newer versions have "after glow" programmed in them and you can get several cycles of glow even with engine running

I have a 90 GMC C1500 SWB stepside currently with 4.3 V-6 with the 5 speed manual GETRAG transmission, planning on mating it to a 6.5 turbo engine, spent time with Bill Heath on the subject and he said he ran similarly set up without any issues, and said it was a "fun truck".

Thanks Nobby I missed that, Max E was what I was running before HP4 and I'm on like HP10 now :) even though Bill did not assign a number to program I'm running now.

That is a must do IMO; before going with that mod I was always falling off in the power band I would flat stop gaining momentum.

Good point, as the GM turbo was sized for stock HP levels/flow, but I'd still like to see the drive pressure numbers.

I had 2 gauges installed 1 permanently installed for boost, and a second tapped to the right bank collector just below the turbo entry to monitor the backpressure/drive pressure, with GM turbo once approaching 10 psi boost the back pressure with the GM waste gated turbo starts driving 2x the...

AFIK there are some tunes for the OBD-I HXs, I do not believe Bill has done any tweaking for the HX it was like pulling teeth to get him to tweak for the ATT, as far as the ATT being close to the HX if the "unbiased tester" is to be believed, apparently the tune is not close enough the HX tune...

Done

Can you update your signature to tell us what is the project, I'm a little confused was this a 6.2 engine swap into a truck that came with a 6.5 EFI IP/PCM/harness originally and you swapped over the 6.5 turbo parts onto the 6.2 engine ?

In order to make the engine brake work on an auto trans you also have to incorporate some sort of TCC lockup control, otherwise it will just slip and you will not have any dynamic braking effect from the engine as it will be decoupled more or less from drive line as the torque converter slips/

Off top of my noggin, the GM-3 is less efficient than the newer turbos and more back pressure impact in it than say a GM-8 does, IIRC the GM-3 is also a spring actuated WG, and a stiffer spring or a TM fully adjustable WG is what could have let it have more performance

Moved from the HX thread to allow discussion within own thread.

GM Parts direct possibly or maybe even LMC Truck ????

Was that the turbo from the original Banks stinger kit for the 6.2s

It is not the final boost pressure that is critical, it is when boost & fuel are combined in proper event cycle and the efficiency the turbo produces the boost, my big turbo worked ok with GM programming, even my GM-8 could make 20+ psi but fell off in ability to produce boost without struggle...

Alternator change ??? I had a reman I got from GM dealer once 3 weeks after installing it, chirped like birds swapped it out for a Duralast Gold and chirp went away for a couple of years, lifetime warranty on it so I replaced again been 3 years now chirp free

What brand is the new belt, I had a Autozone belt Duralast IIRC chirped day one installed it, swapped to a Goodyear and chirping stopped

Just uploaded some video http://www.thetruckstop.us/forum/showthread.php?2015-Replacement-turbo&p=427921&viewfull=1#post427921 Starts @ post 793 see above also for vids

I wonder what that turbo would do with a program tuned for it, one thing with all the back & forth with mine some tunes did better than others, my current tune is pretty close but still needs some tweaking IMO. Boost lag some would have you believe is all you will ever get from a big turbo is...

These are some older videos before my current reflash was installed, no tail pipe videos when I took these http://www.youtube.com/watch?v=WEs1k7gTwls http://www.youtube.com/watch?v=eRED6WUR8UA http://www.youtube.com/watch?v=KMKdm0IgzFM