Good Morning All,
Long story short, I've been building this truck for over 4 years, spent way to much and made a lot of mistakes, hopefully someone can help me with the last hurdle.
Over the winter I sent my truck out of state for some mods to be done (new headers, injectors, intake etc). there are only 2 decent shops I trust around my area (upstate NY) and they're always slammed, so I sent it out if state. I was supposed to have a dyno tune but because the truck is a long bed it wouldn't fit on it so they did a "street tune", great shop but the tune isn't great and the truck just isn't running right.
To start here's what were working with.... and yes I know the turbos are too big for the motor but I wanted a wow factor, just should have bought a bigger block...I know for next time.
I have a 1959 Chevy Apache with the following: 5.3 LS with forged internals, twin GT35s (not sure the boost, maybe 12 lbs), 1000 DW injectors. First stage twin turbo cam from lil Jon's, 4L80E tranny with hd kit, 3600 stall torque converter from PTC and a Ford 9" rear with 3.55 gears.
The problem:
The initial start and idle were ok but now it is very rough but levels out only if I hold the gas pedal at around 1500 - 2k rpms for about 10-15 seconds. Then I'm told it goes into closed loop and finally idles semi normal. Even if I let it "warm up" for 20 minutes it wants to stall out when I put it in drive and begin to go. Once driving it stays running but feels real sluggish off the line. Once your cruising, at any speed, it feels as if it's misfiring or starved for fuel, you feel little shudders in the motor.
If I'm cruising and stomp on it downshifts correctly, builds boost but the waste gates will start popping like crazy...it doesn't feel normal. If I stomp on the gas from a stand still it will take off fine and maybe spin the tires. Typically it will build boost and THEN begin to spin the tires or hop the rear tires.
Transmission shifts fine, I had diagnostics checked by a local company. I also thought about the possibility of the torque converter being locked but was told it was bypassed in the tune or I wouldn't be able to drive it. Another 4L80e owner said I need a wire run to the brake pedal to release the converter....maybe that's the initial stall issue?
So far I have the current tune file and taken a driving log with idle, cruising and some high rpm rips.
I'm stuck with this awesome truck and terrible tune, It should be a beast but it has a hard time getting out of its own way. I need any and all help I can get. If anyone can remote tune, I don't mind compensating for your time either. Please let me know what other files I can post, I'm new at using the software but I can follow videos/directions.
cold start and drive.hpl
6-17 apache current tune.hpt