No acceleration after 80

[CoastalF350]

I noticed it two days ago when going to pass someone. I was driving 80 and went to gas it when I did the truck did nothing and slowly slowed down. I pulled over to the side and it accelerated normally. Did the same thing last night when I was heading to Houston on 59. No codes. Any ideas?

 

[ToMang07]

I noticed it two days ago when going to pass someone. I was driving 80 and went to gas it when I did the truck did nothing and slowly slowed down. I pulled over to the side and it accelerated normally. Did the same thing last night when I was heading to Houston on 59. No codes. Any ideas?

Tuned? Or did it seem mechanical?

 

[CoastalF350]

Truck has had a custom tune for little over a year from innovative diesel

 

[sootie]

sticky turbo vanes.

 

[CoastalF350]

Thank you!

 

[sootie]

do you have a way of seeing what your boost does?

 

[CoastalF350]

I have an SCT livewire. I will look here in about an hour. Turbo is a Mad Turbo Werks Stage 1

 

[sootie]

oh. that could be your issue.

if the boost gauge doesnt go up when you lay into it or drops slightly-it usually means sticky vanes.


its not a manual trans is it?

 

[CoastalF350]

5r110 Auto

 

[suprdzlduty]

it could possibly be that you may need to raise the speed limiter (governor) with the tuner. 80ish is where most of them were set on some trucks. see it a lot in the early 250's and most (all years) of the 450's and 550's.

 

[morepower02]

That's the first thing I was thinking is the speed limiter needing raised.

 

[KingRanch6.4]

I have an SCT livewire. I will look here in about an hour. Turbo is a Mad Turbo Werks Stage 1

Can you see boost pressure on the LiveWire? I have one and not familiar with that being available. I wish it were though.


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[strokin6L]

How does the truck shift and pull/accelerate up to 80mph? I thought maybe could be worn out torque converter...but maybe not.

 

[CoastalF350]

Boost from dead stop is maxed at 26psi. Im pretty sure i set my limiter to unlimited

 

[morepower02]

Check again

 

[Stroker04]

Doubt it's the tune...when you roll back into the throttle is it building boost or no?

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[CoastalF350]

It builds boost fine it seems.

 

[black'n'blue]

I have a 5015 livewire and there is a pid for boost. Pretty accurate too. It's right on with my aftermarket gauge