13.99?? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 21 (permalink) Old 06-21-2010, 10:24 PM Thread Starter
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13.99??

Last Friday I ran a 13.99 at 76mph with my elite tranny, 345 tune, and traction bars. What the he11 happened is my question. My 1/8mile said 8.6 @79mph. So as I progressed I slowed down while my foot was still buried?

Colton

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post #2 of 21 (permalink) Old 06-21-2010, 10:46 PM
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rail pressure? defueling?

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BRING BACK THE OLD TDG!
oh well, i have a map to the darkside

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post #3 of 21 (permalink) Old 06-21-2010, 11:38 PM
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Yea, something ain't right there. Is this Mike's 345 tune or our 350 tune?

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post #4 of 21 (permalink) Old 06-22-2010, 02:09 AM Thread Starter
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I have a hunch it's rail pressure. Sure doesn't feel like defueling, had plenty of that with the old tranny and 275 tune. And I'm running mikes 345. Probably gonna data log some boosted 4wd launches tonight

Colton

2008 F-250 PSD 4X4 XLT
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post #5 of 21 (permalink) Old 06-22-2010, 05:46 PM
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What is the highest Spartan tune you have?

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post #6 of 21 (permalink) Old 06-22-2010, 06:58 PM Thread Starter
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275 for now. Probably gonna get the 350 when I get the money

Colton

2008 F-250 PSD 4X4 XLT
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post #7 of 21 (permalink) Old 06-22-2010, 07:36 PM
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I would be interested to see if the 275 tune can maintain rail pressure. Did you get any codes? I know you don't have any special parts on your truck....so its odd that your not maintaining rail pressure. The fact that you lost speed is pretty crazy.

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post #8 of 21 (permalink) Old 06-22-2010, 08:16 PM
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what would cause the rail pressure to drop so much?

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post #9 of 21 (permalink) Old 06-22-2010, 09:21 PM
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Quote:
Originally Posted by 6L strokin View Post
what would cause the rail pressure to drop so much?
I would think a tune issue since he hasn't done any fuel system mods.....but it could also be the low pressure fuel pump not keeping up. The only thing is, I believe there are people out there running our 350 tune and Mike's 345 tune with the stock low pressure fuel pump and not having any issues.

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post #10 of 21 (permalink) Old 06-22-2010, 09:30 PM Thread Starter
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the 275 and old tranny did the same thing to me a couple monthes back. only the tranny defueled while running down the quarter mile. i ran a 14.5 that night... with my 1/8 mile speed higher then the 1/4 mile speed. didnt get any codes off those runs. but if it matters any running the KEM 310 i can goose the pedal a little and the high fuel rail pressure alarm goes off at over 28500psi.

Colton

2008 F-250 PSD 4X4 XLT
Spartan-MBRP-Elite-AFE-KEM

542hp 1060trq 9/18/10
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