Hit the track today in my "new to me Lmm" something is off - Chevy and GMC Duramax Diesel Forum

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post #1 of 62 (permalink) Old 11-25-2012, 03:27 PM Thread Starter
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Hit the track today in my "new to me Lmm" something is off

First off mods are mpi stock over s480, 100hp ddps, 120 over II double dragon pump, ppe up pipes and manifolds, ad 165,Sdp intercooler pipes, cognito 4 inch lift," all the way down to the bump stops" cognito braces and tie rods, traction bars, 305/55 20 cooper zeons, Ppe stage 5 trans- precision ml converter EFI tuned by Rob
Ok sorry haven't updated my sig
Anyway on the big tune leaving at 10lbs of boost cut a 1.728 60' ft
1/8 mile 7.915 @ 85.08
1/4 mile 12.548 @ 103

Expected a little more and in my opinion the 1/4 mile mph is way off for the time any opinions on what might be wrong, my guess is rail pressure. Didn't have my v2 to log so I guess it's kind of a shot In the dark because I'm sure y'all will say get rob to check the log but let me know what y'all think
Thanks


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09 ccsb lmm cognito 4-6, bmfs, MPI TWINS. Double dragon, 100hp ddps, arp studs, track bars, trans built by Trey Fox (blackdirtymax)
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post #2 of 62 (permalink) Old 11-25-2012, 03:53 PM
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Whats your location/altitude? My guess would be that rob has some extremely conservative tuning on it to keep those poor lmm pistons alive. You have alot of fuel and air potential that will easily destroy your stock bottom end.

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post #3 of 62 (permalink) Old 11-25-2012, 03:58 PM
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Id rape it just so I had to build it. Im puttin twins on mine(S475 over stock), almost certian Ill trash the rods and have to do surgery again with carillos.

05' Chevy LT Black on Black LLY CC/SB Blackout Performance built motor/trans/tuned- Gone

"The Blessed Hellride"-08' GMC Sierra SLT Z71 CC/SB White

Big Dipper stage IV trans, Willis tunes and a bunch of other useless stuff.
Motor, more fuel and air coming when Obama gets the f*ck out and oil isn't free
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post #4 of 62 (permalink) Old 11-25-2012, 04:02 PM Thread Starter
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The truck was tuned for the first owner In Ohio I'm in eastern Georgia 330 to 360 above sea level


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09 ccsb lmm cognito 4-6, bmfs, MPI TWINS. Double dragon, 100hp ddps, arp studs, track bars, trans built by Trey Fox (blackdirtymax)
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post #5 of 62 (permalink) Old 11-25-2012, 04:03 PM Thread Starter
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Quote:
Originally Posted by mike diesel View Post
Whats your location/altitude? My guess would be that rob has some extremely conservative tuning on it to keep those poor lmm pistons alive. You have alot of fuel and air potential that will easily destroy your stock bottom end.
And yeah i was told it was detuned for the pistons I just didn't think I would see so much of a drop I'm mph on the big end


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post #6 of 62 (permalink) Old 11-25-2012, 04:05 PM
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Is this nick's old truck?

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Mine: 2008 CCLB Duramax 13.68 @ 98.25
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post #7 of 62 (permalink) Old 11-25-2012, 04:08 PM
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Why do you think its rail pressure? Do you have a log of the run?

Somethings wrong, I ran 107mph on stock LBZ.
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post #8 of 62 (permalink) Old 11-25-2012, 04:12 PM
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Did it feel like it layed over in the higher gears? Maybe a converter problem.

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post #9 of 62 (permalink) Old 11-25-2012, 04:22 PM
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you had a good 60 ft time for having a lift kit. i would think that your tuning is what is holding your back. ever been on a dyno?? i'm not a fan of II pumps, but it should be able to keep up. you have more than enough potential to blow your shit up!!

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EPR s475 o/stock, floor-it stg II cp3, Kory tuned, suncoast, tow-flows, Y bridge, insight, EXAXT,
cognito uca's, trac bars, AD II 165, banks IC, blacked out grill, cowl hood, tough country bumpers
Dyno - 582hp 1209tq - SJD, 561hp 1247tq floor-it-diesel (stock turbo & inj.)
Track - 12.82 @ 105.5 mph @7300lbs 1.82 60 ft

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post #10 of 62 (permalink) Old 11-25-2012, 04:25 PM
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Big tires will kill it some too. Mines a horse when unloaded but still not a fast as a truck with less mods and smaller tires. I'd go back to 33's but then I'd be wound for sound. you def. benefit for smaller tires with the 6 speed.

05' Chevy LT Black on Black LLY CC/SB Blackout Performance built motor/trans/tuned- Gone

"The Blessed Hellride"-08' GMC Sierra SLT Z71 CC/SB White

Big Dipper stage IV trans, Willis tunes and a bunch of other useless stuff.
Motor, more fuel and air coming when Obama gets the f*ck out and oil isn't free
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