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Old 02-15-2012, 02:30 PM
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help with 99 f350 7.3 turbo 6 spd

I recently bought this truck a month ago. it has a superchip 100hp chip according to the the previous owner. i since installed gauges(boost,egt) took out the junk k&n filter and did the diy intake 6637 filter 4 in pipe and had the diamond eye 4 in down pipe into 5 inch exhaust,and replaced the rear rotors, brake pads and e-brake shoes.before all of this the truck would pin you in the seat. now the truck seemes to have no power when it boosts around 2k rpm.in third and 4th gear when im on it hard. i have had the rpms to jump a few hundred rpms once or twice. im trying to diagnose if its tranny or turbo related.tranny seemes fine in 1 and 2 it does grind going into gear more than most trucks. i have noticed a odd whoosh whoosh whoosh sound thats happens very fast while im in boost. i played it off as normal sound from the turbo since i do have a open intake.im planning on putting a dp tuner on the truck and junking the superchip but im wondering if i need to replace the clutch or upgrade the turbo or what im at a loss. my turbo does read around 20-25psi on the gauge. i just hate to ignore it and it be serious. thanks
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Old 02-15-2012, 03:13 PM
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Some of that is kinda vague but this is what i saw in your writing,
rpm jumping a few hundred in 3rd and 4th would indicate a clutch slip
and the whoosh, whoosh, whoosh that happens fast sounds like turbo
surge which would be common if you imrpoved the breathing of the engine.
Bigger exhaust and better filter should have helped it breathe better.
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Old 02-15-2012, 04:22 PM
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what do you need me to clarify for you?
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Old 02-15-2012, 05:21 PM
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Quote:
Originally Posted by strokinfirefighter View Post
.before all of this the truck would pin you in the seat. now the truck seemes to have no power when it boosts around 2k rpm.in third and 4th gear when im on it hard.
This.

Could you explain a little better?

I might not be reading it very clearly.

Does it run better above 2k?
Does the surge stop above a certain rpm?
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Old 02-15-2012, 05:33 PM
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Runs terrible past 2k rpm and surges around the same.my question is can turbo surge mimic tranny slip?
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Old 02-15-2012, 05:43 PM
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If you have a 6 sp manual trans, it isnt gonna slip!!
The clutch will but the trans is messed gears. If it slips you will know it! Lol

And i was reading that wrong. Turbo surge will hurt power output. Does your boost
guage start fluttering at the same time?

Im still not sure on the slip part. If your clutch slips, the rpm will just climb then when you let off
They will fall back to were they should be.

Did this help?
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Old 02-15-2012, 05:46 PM
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No the gauge didn't jump at all. And yes it answered my question I'll replace my clutch before I go any farther
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Old 02-15-2012, 05:48 PM
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I guess my next question is could I be making too much power causing it to slip or is it more likely it's a bad clutch?
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Old 02-15-2012, 05:49 PM
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I wouldnt think you would have clutch slippage if you are down on power but clutch slippage can feel down on power.
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Old 02-15-2012, 05:51 PM
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Maybe.
Dont know what clutch you have, how many miles on it, and what kinda life it has had.

Your truck is making more than factory power thats for sure so its possible.
I dont have experience with how much the stocker can hold.
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