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Thread: Problems with "professional" tune? Rough idle and light throttle surging

  1. #1
    Tuner in Training
    Join Date
    Jan 2019
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    11

    Problems with "professional" tune? Rough idle and light throttle surging

    Hello all,

    I recently completed a build on a 35,000 mile 2016 Corvette LT1 with A8 trans. Car ran just great before build and teardown showed very little wear. Build as follows:
    10.5:1 pistons with H-beam rods
    Brian Tooley custom cam I 227 E 244 LSA 115 ICL 110 38% fuel lobe and lift at .637 and .631
    VVT and DOD delete
    Johnson 2110 lifters with 7.825" push rods
    LT4 HPFP and LT4 injectors
    NGK 6510 plugs
    3 bar MAP sensor
    2" ARH longtubes
    ProCharger D-1X with vertical cooler, red race valve, open race filter and 4.25" pulley
    Mighty Mouse Solutions Wild catch can

    Vehicle has no other mods. Fuel used is 93 pump gas.

    When I picked the car up from the tuner the idle seemed rough. In gear and out. Light throttle cruising seems like it could be smoother. Occasionally on deceleration to a stop it seems as though the converter is staying locked too long, almost as if the car could stall. The tuner basically blamed it on the custom "big boy" cam. Full throttle pulls seem ok. The overall drive ability around town is just kinda brutal.

    I'm attaching my tune along with a couple of log files. My question is, can my car be tuned better than this? Thanks in advance for any help that you guys could give me!

    2016 LT1 A8 Corvette Copy.hptstart with warm up cruise.hplWOT acceleration.hpl
    Last edited by KemahGT; 06-17-2019 at 06:39 PM.

  2. #2
    Senior Tuner mbray01's Avatar
    Join Date
    Dec 2013
    Location
    Slidell, La.
    Posts
    1,015
    My best advice is get a refund on your money, and get a new tuner. The things that 100% need to be tuned, are not. Very sloppy. He set minimum timing just to get it to idle. IF he would have done just a little actual tuning, the thing would run better. Just so much wrong.
    Last edited by mbray01; 06-17-2019 at 08:23 PM.
    Michael Bray
    Rusty Knuckle Garage
    Slidell, Louisiana
    20yr Master Tech.
    Advanced Level Specialist
    Custom Car Fabrication, Customization, High Performance.
    GM World Class Technician
    Shop Owner

  3. #3
    Tuner in Training
    Join Date
    Jan 2019
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    11
    Thanks, Michael. I am in the SE Texas area. Do you know of any competent tuners in my area? I’m willing to travel but would prefer someone nearby.

    My tuner knows that I was unhappy with his tune but has so far has refused to offer any kind of refund. Once I get a good tune I will offer to send him the new tune so that he can buy it (refund my money) for his own education. If not, I will out him on any and all LS related forums. He has a name in the LS tuning world but I think he just may not be up to snuff on the Gen V platforms. I tried doing my due diligence but was only able to find a single complaint. It was a communication problem and not tune related. It’s tough finding anyone that seems to know what they’re doing.

    Again, thanks for the reply.

  4. #4
    Tuner in Training
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    Nov 2017
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    11
    Try Pat G in Victoria

  5. #5
    Senior Tuner mbray01's Avatar
    Join Date
    Dec 2013
    Location
    Slidell, La.
    Posts
    1,015
    Its not that he needs to be educated on tuning a gen 5, he needs to not be lazy, and actually tune what needs to be tuned. Guys have become very lazy, and you could get away with it on all early models. the gen 5 stuff, you have to tune it properly, I.E. all airflow modeling needs to be properly dialed in, and agree with each other. if you do not tune vve on a gen 5 it will never operate properly. ever!!!!!
    I would get it retuned, then bring to him and show him how a proper tune works, and how a "big boy" cam can actually idle and drive. I wouldnt let him pull the tune though. Your just giving him an opportunity to say this, that, and the other isnt right in the tune.
    demand your money back. you paid for a tune, he gave you about 10% of said tune.
    Michael Bray
    Rusty Knuckle Garage
    Slidell, Louisiana
    20yr Master Tech.
    Advanced Level Specialist
    Custom Car Fabrication, Customization, High Performance.
    GM World Class Technician
    Shop Owner

  6. #6
    Tuner in Training
    Join Date
    Apr 2018
    Posts
    12
    It is highly unlikely that any tuner will refund your money after they've given it to you, regardless of whether it's shit or not.

  7. #7
    Advanced Tuner
    Join Date
    Dec 2015
    Location
    Miami,Fl.
    Posts
    290
    Just take the L and get it re calibrated. At least you went out of your way to check it and found what you did and took initiative.
    2023 Ford Maverick 2.0T AWD

  8. #8
    Tuner
    Join Date
    May 2017
    Location
    North Florida
    Posts
    80
    Try Rick Clarke Unlimited Performance Corpus Christi

  9. #9
    Lots of good tuners around Houston are just depends on where you are and how far you want to drive.

    PowerfabAutosports
    Prospeed
    BCRaceworks
    HPC
    MSTuning
    PatG
    etc....

  10. #10
    Ceasar Enrquez at Horsepower Factory, Justin Carpenter at JTC Tuning and Matt Sorian at MS Tuning are all excellent tuners in texas. Anyone of them can get the car running like it should be!