2000Sierra1500

Hello. I am currently building the 5.3l LM7 in my 2000 GMC Sierra 1500 4x4 and have just installed the Fitech Ultimate LS +750HP kit with transmission controller on the truck.

While installing their wiring harness I noticed it wasn't going to be a plug and play like I was told. I called Fitech and explained the situation and was now told it will not work in my truck because the factory PCM controls so many other components of the truck.

My question is wondering if there is a way to disable the engine and transmission controls from the factory PCM to allow full engine and transmission control to the self learning Fitech system without compromising the cruise control, a/c and HVAC, air bags, abs, etc...?

Any help is greatly appreciated.


Thanks

LSX Power Tuning

iTrader: (4)

No offense but your factory pcm was better than that fitech setup you installed.

2000Sierra1500

It's not to late to return the Fitech system. A 10% restock fee is all.

What manifold, throttle body, injectors and rails would you recommend?

Also what do you feel is the best option for the factory PCM? ie. HP Tuners, EFI Live, Jet, etc?

2000Sierra1500

Considering the trouble this Fitech system will get me into I would much rather maintain the factory harness at this point.
I'm in the Nashville, TN area. Do know of anyone who programs around here?

truckdoug

iTrader: (25)

what are your goals for the build, power-wise? HPT and efi live are probably the most user friendly tuning suites available.

I would use TBSS intake with and adapter to a DBC 78mm truck TB, long tube headers and some flex fuel injectors if staying NA. That and a mild cam would be a nice rig for traipsing around the woods in. Just dont go crazy with tire size, or gear down to match. And ditch that 4l60. if thats whats in there.

2000Sierra1500

I've settled on returning the Fitech kit. The goals are to get around 500hp and 450ish ft lbs of torque. It's a street driven truck more than anything. I have 305/70r16 BFG AT KO2's on it for rubber and a small 3" Skyjacker lift.
The 4L60e has been beefed up to the gills and will be more than sufficient for what I use it for. It has a 2,300 stall converter in front also. When it goes out then I will upgrade to the 4L80e and put the Procharger on at that time.
The engine has extensive mods already, Trick Flow GenX 205 cylinder heads, 1.7 ratio roller rockers, ARP head studs, cam was specced by Crower cams to work with my application and cam was degreed, sheet metal intake, 102mm throttle body, 60lb injectors, ARH 1 3/4 long tube stainless steel headers and y-pipe into a Borla catback system, underdrive pulleys.
I ended up ordering HP Tuners a couple days ago. Reprogramming is going to be my best option by far.
Thanks for the input! Appreciate it.