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Thread: high RPM problem

  1. 06-08-2009 #1
    banditlt4
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    high RPM problem

    When I am racing car and go into 3rd gear (th-350) the car is cutting out like its hitting a rev limiter (it is set to 8000) but it isnt. I am data logging car with HPT with a LC-1 wideband. There are no big swings in AFR, no knock, inj duty cycle is at 50-60%. I am running VPMS101, fast 96, MS4, PAT STG 3 5.3 with -5 cc pistons, Pat gold springs, tr55 with 40 gap, walbro 255 and harlin sharp rocker arms. However this problem was present with stock rocker arms. I am running 24.5 deg of timming. When I run the car on the street in thrid gear with no problems. I am at a lost of wehat wrong with car. any ideas out there
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  2. 06-09-2009 #2
    69lt1bird
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    Post your tune and the log file.
    Free HP Tuners Beginners Tuning Guide

    LS1 Tuning Guide
     Michigan Snowmobiler

    1969 Firebird: 11.67@114 [email protected] 1/8 1.70 60 ft. EPS cam 234/246 .602.606 114+3, 6.0 LQ4, L92 heads milled 10.5:1, Ported L76 intake, ported 90mm Holley TB, 100mm MAF, FIC Custom injectors, Hooker LT, PYPES dual exhaust with an X pipe, 4L65e with all of the good parts inside, FTI 4000 RPM Stall, 12 bolt with 3.73 gears. HP Tuner tuned by me
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  3. 06-09-2009 #3
    banditlt4
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    i could not post tune computer wont upload.. i can e-mail it.
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  4. 06-09-2009 #4
    blownbluez06
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    Wondering if you have a fuel cavitation problem. I've seen that before. How's your fuel system set up in the tank? What car is this in? Only way to know is to log or watch fuel pressure while it's happening.
    Hsquared racing engines RHS 427, Procharger F2, Moran Billet Atomizer injectors, Alky Control,Mast LS7 heads, Nitrous outlet kit,Tilton quad disc clutch, DSS shaft, RKT56 ZR1 trans, RPM Quaife diff. Built and tuned by yours truly.
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  5. 06-09-2009 #5
    banditlt4
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    walbro in tank. the rest is stock. i havent had fuel presure gauge at the track yet. if it was the pump would the AFR jump around?
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