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Thread: Only 13.9 with mods

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    Only 13.9 with mods

    So i went to test n tune at norwalk last night..i have a 03 hd with a 6lb lower lightning stock upper. Long tubes, jlt cold air ported blower and plenum and a sct...best i got with power braking at 2k and flooring it was 13.9 at 100mph...this thing should be way faster...it actually bogged down at 2k and flooring it on street tores as track was well prepped and very sticky...help bring this 1/4 mile down

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    Have to remove weight. Also you never listed any of your suspension mods. Would also like to see your 60ft times

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    Name: Derek

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    Could be leaving a lot on the table with your tune as well. You just mentioned SCT. Is it a canned tune? Or custom tune?

    There's certainly a lot more to it than just throwing parts on the truck.

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    Out of curiosity, what should a well tuned and bolt on HD with a 6lb lower run?

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    It is a canned sct tune...2.0 60ft...foot brake,at 2k then flooring it bogged down and never spun the tires. It felt like i was rear ended it fell in its face so bad

  6. #6
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    Quote Originally Posted by SLOWBRA View Post
    Out of curiosity, what should a well tuned and bolt on HD with a 6lb lower run?
    Should be consistent mid 13's at least.

    I have a 6lb lower, 2.8 upper, and ported blower and run consistent 12.9x-13.0x

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    Quote Originally Posted by SonicHD View Post
    Should be consistent mid 13's at least.

    I have a 6lb lower, 2.8 upper, and ported blower and run consistent 12.9x-13.0x
    Mine feels like a mid 13 so thanks for confirming. For now I'm happy with it as I have two other cars dedicated for racing/fun. Would like to eventually get it in the 12s at some point.

  8. #8
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    Name: Bob

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    Mine feels like low 8's in the 1/8. Slow .... still stock.... no 6#. ... no custom tune..... but hopefully soon.

  9. #9
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    There is an old generality that every 1/10 second improvement in the 60' time translates to a 2/10 second improvement in the ET (in a 1/4 mile pass). The tune can greatly impact the 60'. I don't frequent the track... hell, I haven't been down a track in six years but a primary motivating factor for my wanting to get into self-tuning is so I can make the necessary tuning tweaks after any given pass.

    "Flashing" the converter might help with your 60'. Foot braking up to 2,000 RPM might be a little high of an RPM to get a good flash.
    Last edited by throttle jockey; 09-27-2016 at 12:20 PM.

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    Headed back to track on wed night...see what happens...unhooked all lines going to boost bypass. Seems to hold boost better...any other things to do.

  11. #11
    Registered User
    Name: Allen

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    Did you delete the boost dump solenoid or the boost bypass actuator? I suspect the "placeabo effect" is the reason you see any difference. In terms of genuine performance gains don't expect much (if any) improvement if you unplugged the boost dump solenoid, its not a wastegate or BOV.

    If you deleted the boost bypass actuator you can expect cavitation, excessive charge temps, and in the long run you can anticipate premature SC wear/failure due to the excessive heat.

    The tune and the lack of time to dial in your set up are likely the two largest conteibuting factors to your lack-luster ETs. As I mentioned in my previous reply, "flashing" the converter may improve your 60' which ultimately improves the ET.

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