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Engine surging at specific speed

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2nd Gen Non-Engine/Transmission Electrical Gremlins

Truck surging at 50

2002 24v cummins

35 inch 12wide rims and tires and spacers to adapt rims to 8x6.5

3.55 gears

Fass 150

Hot rod vp44

Edge hammer bb turbo 58mm

225hp injectors

Quadzilla pulse v2

4inch exhaust

Built trans with stock stall Dpc triple disc firepunk valve body firepunk comp rebuild kit and gm govenor pressure solenoid with power driven billet input shaft


Truck runs great to a certain extent previously I had a stock trans with no overdrive a Dpc triple disc low stall converter the tc would slip in lockup in 3rd so I pulled the trans and rebuilt it with a firepunk comp kit and had them build the vb for my hp goal I shipped the converter off to Dpc had it inspected and restalled to stock. After some transmission ptsd I reassured the line pressure and it was on point with what they said it should be and lockup with overdrive off in 3rd locks up strong with no slip and can cruise just fine. Now comes the ordeal when in overdrive the trans will cruise fine until I hit 50mph and the torque converter locks up it will begin shake if I modulate the throttle and almost power through it I can make the shaking substantially disappear but the egt will progressively climb to 1000 if I set cruise control egt will slowly drop into the 800. To my conclusion I’ve made a list of possible ideas of what it could be.


Tire size and gear ratio causing the engine to bog and or surge when trying to pass 60 or cruise between 50-60


To Much fuel not enough air which would explain the low boost when trying to cruise and high egt.


bad tuning


was going to swap injectors back to stock but the hot rod vp44 will not support stock injectors
 
Welcome to TDR. I'd love to help but ISB VP trucks are out of my area of experience. You posted this thread in the 3rd Gen forum.

This is the pot calling the kettle black here but try to condense any relevant information about the issue you're having with your truck to a system or systems.

You're having surging, when did this start and what was changed before this happened? Isolate the issue as much as possible, a full build list isn't necessary.
 
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