Skinny Pedal Affect on Boost - Diesel Place : Chevrolet and GMC Diesel Truck Forums
 
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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

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Old 07-13-2019, 12:01 PM   #1 (permalink)
russellranch
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Join Date: May 2019
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Skinny Pedal Affect on Boost

Can the skinny pedal be modified to increase boost? The reason I ask is installed Boost and EGT gauges on new to me truck 6 months ago and I immediately noticed I could get boost to at least 17psi and could hold it. Yes way to high. So I switched out Waste gate solenoid and MAP sensor thinking previous owner modified them. No change still high boost. I had a second ecm installed it to see other ecm had been modified, still no change, high boost. Truck later began to hesitate, traced it to bad fuel pedal sensor. Replaced the whole assembly with new gm unit and now the truck will only get to max 12 psi boost then immediately fall back a bit. Still don't understand why I am getting up to 12 psi, but I am not worried about it. So basically the new skinny predal decreased boost to a safe level and some how also allowed the waste gate to work more quickly. I have never heard of this, has anyone heard of this before?

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1999 GMC Suburban K2500, 6.5 TD Optimizer, NVG4500, 4.10 gears
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Old 07-13-2019, 01:40 PM   #2 (permalink)
johnH123
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Join Date: Jun 2018
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Well I have a GM3 (first generation) turbo that has a spring activated wastegate. The truck is too old to have the vac wastegate.

I got a boost gauge hooked up. Took it out on the interstate and opened her up. I was surprised to see 13 psi going up a hill at 75 mph when I hammered the pedal. cruising is about 6-7 or so. On the regular highway at 55 its running 3 psi, and 5-6 up hill.

From what I've read it shouldn't be an issue unless its over 15 psi. The way the vac wastegates work is the boost is supposed to peak at around 2000 rpm and then level off. I wouldn't worry about it unless its over 15 psi or it's causing an issue.

If it has a hesitation i would check the lift pump and the fuel lines to make sure theres good fuel flow and no air intrusion.

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1993 K3500- 4x4, single cab/long bed, single rear wheels, 4.10 rear end, F vin, Nv4500 manual, factory red interior.


Gone but not forgotten: 2001 silverado 2500hd CC/SB, 4x4, 6.0 vortec, 229k miles when I traded it.

Last edited by johnH123; 07-13-2019 at 01:41 PM.
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