Why does this happen

[x MadMAX DIESEL]

Ever since I can remember my truck feels slow and just smokes if I floor it in any gear till I get into o/d. Boost stays in the mid 20s. Infact the only time I really ever see 30+ psi of boost is when its in o/d. But if I down shift manually and floor it, especially if I roll into it, I get good boost low smoke and feels way faster? I have an ally locker so I know its not blowing through an unlocked tc.

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[Harbin_22]

Might want to log tclock up and see if it is working.

 

[TeaBagger2006]

might be your tq converter or tuning. i know when i was running my ppe on the hot tunes it would do what you described. when i switched to efi it behaved different and bby different i mean the opposite....granted at the top end it felt the same

 

[x MadMAX DIESEL]

I'll check but I'm sure my tc locks just fine. Also its done it with 2 different peoples tunes.

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[sweetdiesel]

To much fuel in low RPM...Im geussing anyway.

Hard to tell with out seeing the tune or atleast a LOG

 

[x MadMAX DIESEL]

I forgot to log this run I'm at the track now ill be sure to record these other runs. Did 13.1 at 101.9 mph with 20s boost and smoked out the whole track.

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[paint94979]

I forgot to log this run I'm at the track now ill be sure to record these other runs. Did 13.1 at 101.9 mph with 20s boost and smoked out the whole track.

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youre truck based on mph is around 475 depending on weight...

 

[x MadMAX DIESEL]

And it shouldn't be. Thebac has made almost 11 second passes and I'm fighting to hit 12. That's why I could never run good at the track but street racing wax anything around.

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[x MadMAX DIESEL]

Left the track last 2 runs had 102 mph. This was leaving with like 5 psi slow as hell and running half throttle the first 1/8th mile to keep on top of the charger.

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[paint94979]

Log it... I'm betting you aren't getting TC Lockup

 

[x MadMAX DIESEL]

Log it... I'm betting you aren't getting TC Lockup

Doubt that's it, but well see once I get a laptop

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[SmokeShow]

where'd you go Ben? I'd really like to go to a track some time but none are very close to central KY.

 

[x MadMAX DIESEL]

Clay city. The kyhorsepower shoot out is tomorrow and I was hopping to run, but doubt I will now. London would probably closer for you I think.

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[JoshH]

Leave with more boost. I launch at 12 to 15 psi or 2000 to 2200 RPM usually.

 

[x MadMAX DIESEL]

first run I left at 15 and spun so I afterwards it was around 10. Running 285/75/16 on pyos with 35 up front and 30 in the rear. Caltracs adjusted to make contact once boost is built.

 

[x MadMAX DIESEL]

TC is not the problem, locks in first gear and doesn't slip.

 

[JoshH]

When I run my PYOs with 265s at the track, I run about 5 lbs less in front and back. 15 psi launches may be too much depending on your converter, but 5 psi is nowhere near enough. You'll just have to practice to see what your truck likes. I think lowering tire pressure a little will help though. I think you may have something else going on though. I don't have any problems building 30+ psi of boost on my truck with the stock turbo no matter how I launch. I think Simon is right about your tuning. It's being overfueled and is hurting how well the turbo can spool.

 

[x MadMAX DIESEL]

Could very well be. I sent some logs over to Trent and hes working on it as we speak.

 

[x MadMAX DIESEL]

Josh, when you say build 30 psi.... Is that once it hits o/d, or through out every gear?

 

[paint94979]

With a VVT you should hit 32psi REALLY quick... Long before 5th