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Thread: [HP Tuners] pro tuner needed

  1. #1
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    [HP Tuners] pro tuner needed

    Hello Guys,

    I do live in Italy and i do have a 2014 Corvette C7 Z51. Recently i've installed Texas Speed Long Tube Headers (1 7/8 Catless X-Pipe) and had my Car remotely tuned by a Tuner in USA trough HP tuners (i do have HP Tuners suite with MPVi2).
    The car is running fine with the mail-tune, but i've asked to this Tuner my wish to have some over-run to the tune (pops and crackles in decel), he refuse because he said it was not safe in his opinion, but i do have this type of tune on other cars (R8 v10 plus, 488 GTB and R35 GT-R) with zero issues, if it is done inisde the safe parameters.
    Someone that could help me out with it? I have attached my Tune file.

    Thanks a lot,
    Alessio
    Attached Files Attached Files

  2. #2
    Senior Tuner Ben Charles's Avatar
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    Pop and cracks on decel is mainly lower spark in that region... simple

    Email Tunes, PM me for more info
    96 TA Blown/Stroked, 4L80E/Fab 9
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  3. #3
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    Easy way to get the pops and cracks on decel is to lower the Minimum Base and Long Term spark in the decel areas. This will allow Torque Management Advance to pull more timing. Lowering the High Octane Base table will not get you what you want because Minimum Spark tables will override it.

    By the way, if you have cats on the car this will shorten their life quite a bit.
    I've tuned a few things...

  4. #4
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    Quote Originally Posted by TriPinTaZ View Post
    Easy way to get the pops and cracks on decel is to lower the Minimum Base and Long Term spark in the decel areas. This will allow Torque Management Advance to pull more timing. Lowering the High Octane Base table will not get you what you want because Minimum Spark tables will override it.

    By the way, if you have cats on the car this will shorten their life quite a bit.
    Hello
    im running without cats, so no problem..
    can you try modifying the tune and send it back?
    thanks

  5. #5
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    Someone that can help? i will pay for the service

  6. #6
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    Quote Originally Posted by Ben Charles View Post
    Pop and cracks on decel is mainly lower spark in that region... simple
    Can you help me out with the calibration to achieve that crackles in release?
    if you give me an email i will send you the Tune.
    thanks

  7. #7
    Email it to me I will do it for free.
    ahmedabri97@gmail.com

  8. #8
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    hello
    i've just sent you an email.
    thanks

  9. #9
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    I just heard your video over on Corvette Forum. Sounds great.


    ahmedabri97, how bad do you think that would be for OEM cats? lol
    I've tuned a few things...

  10. #10
    Usually it does not effect factory cats but will not sound that nice with cats.
    We do it all the time in the Middle East. 😂😂
    It seems to reduce spark plugs life by 25% maximum.
    No effect on the engine durability.

  11. #11
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    Quote Originally Posted by ahmedabri97 View Post
    Usually it does not effect factory cats but will not sound that nice with cats.
    We do it all the time in the Middle East. ����
    It seems to reduce spark plugs life by 25% maximum.
    No effect on the engine durability.

    I miss the sound on my Z51 Vette. I tuned it the same way to have a lot of crackles but I had headers and hi flow cats. Sounded crazy loud and good. Figured its a waste to try in on the OEM cats on my Z06. Maybe if I add headers later I will do it. The ceramic based OEM cats can't stand up to the punishment like aftermarket cats can. And as you mentioned they will kill some of the sound.
    I've tuned a few things...

  12. #12
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    For those interested in the final result:
    https://youtu.be/W3k2z0wvSa8

  13. #13
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    Sounds good! So how much adjustments were made to achieve the level of pop and crackle?

  14. #14
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    Quote Originally Posted by Fu03steveC63 View Post
    Sounds good! So how much adjustments were made to achieve the level of pop and crackle?
    You have to go down to single digit timing values to get crackles like that. I'd say its likely set to 2-5 degrees.
    I've tuned a few things...

  15. #15
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    Only around the range where downshifts occur, correct? And the similar adjustments are made in both minimum base and long term spark?

  16. #16
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    Quote Originally Posted by Fu03steveC63 View Post
    Only around the range where downshifts occur, correct? And the similar adjustments are made in both minimum base and long term spark?
    You don't have to change the high octane table at all. It's best if you leave that table alone. The Minimum Base/Long tables are the minimum allowed spark after Torque Management Advance removes timing to bring the requested torque down along with closing throttle etc etc. Since DFCO and decel is now also driven by Torque Management this is the only area to address.

    In your Minimum Base/Long timing tables drop the spark advance value to 5 degrees in the decel areas that you want crackles. For LT4 cars you want the do the .08 and .12 rows for the correlating RPM, you can do the .16 row too but don't mess with any RPM range below 1600 so that it doesn't affect DFCO and idle. When your in moderate to hard decel in the LT4's your typically at .12 or lower airmass. For LT1's you can lower the .16, .12, and .08 rows because they seem to mostly be in the .16 range on decel rather than .12 like the LT4's.


    How this works in a nutshell: Say you're in second gear and you speed up with your RPM's to 4500. Then you stay in 2nd gear and let off the gas. The Airmass drops to less than .16(LT1)/.12(LT4) and the ECU starts pulling timing via Torque Management Advance. A positive value of TMA is actually the amount of timing being pulled out of the High Octane base table(plus adders). Anyhow, the Minimum Base/Long tables tell the ECU what the lowest timing value can be after Torque Management Advance pull timing. If you lower these values, TMA can pull timing down as low as you have that table set and it will do just that on moderate to hard decel. So once you set those areas to 5 degrees, test it out and see if its too much crackle. You can add timing in the areas that have too much crackle. In fact 5 degrees might be a bit too low at higher RPMs like 4000+. It might get extremely loud at that value. When I built my crackle tune I had it set to 5 degrees from 1600-2800, then ramped up to 12 degrees by 5000 RPM. This made the car crackle really nicely on command. You just have to play with the values to get it to your liking.

    Note: DO NOT interpolate or smooth between the .16 and higher rows. Leave them stock. You ONLY want to change the values in the cells where you are on moderate to hard decel. If you change them in cruise or light decel airmass rows, you will get significant cruise oscillation in throttle and if you're a manual it can really mess with you on gear changes and cause stalling. My advice here is to datalog the car with its current tune and replicate the scenarios where you want the crackles. Then go into your tune and only modify those areas in the Minimum Spark tables. No other changes are needed to any other tables to make the crackles.
    I've tuned a few things...

  17. #17
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    Quote Originally Posted by TriPinTaZ View Post
    You don't have to change the high octane table at all. It's best if you leave that table alone. The Minimum Base/Long tables are the minimum allowed spark after Torque Management Advance removes timing to bring the requested torque down along with closing throttle etc etc. Since DFCO and decel is now also driven by Torque Management this is the only area to address.

    In your Minimum Base/Long timing tables drop the spark advance value to 5 degrees in the decel areas that you want crackles. For LT4 cars you want the do the .08 and .12 rows for the correlating RPM, you can do the .16 row too but don't mess with any RPM range below 1600 so that it doesn't affect DFCO and idle. When your in moderate to hard decel in the LT4's your typically at .12 or lower airmass. For LT1's you can lower the .16, .12, and .08 rows because they seem to mostly be in the .16 range on decel rather than .12 like the LT4's.


    How this works in a nutshell: Say you're in second gear and you speed up with your RPM's to 4500. Then you stay in 2nd gear and let off the gas. The Airmass drops to less than .16(LT1)/.12(LT4) and the ECU starts pulling timing via Torque Management Advance. A positive value of TMA is actually the amount of timing being pulled out of the High Octane base table(plus adders). Anyhow, the Minimum Base/Long tables tell the ECU what the lowest timing value can be after Torque Management Advance pull timing. If you lower these values, TMA can pull timing down as low as you have that table set and it will do just that on moderate to hard decel. So once you set those areas to 5 degrees, test it out and see if its too much crackle. You can add timing in the areas that have too much crackle. In fact 5 degrees might be a bit too low at higher RPMs like 4000+. It might get extremely loud at that value. When I built my crackle tune I had it set to 5 degrees from 1600-2800, then ramped up to 12 degrees by 5000 RPM. This made the car crackle really nicely on command. You just have to play with the values to get it to your liking.

    Note: DO NOT interpolate or smooth between the .16 and higher rows. Leave them stock. You ONLY want to change the values in the cells where you are on moderate to hard decel. If you change them in cruise or light decel airmass rows, you will get significant cruise oscillation in throttle and if you're a manual it can really mess with you on gear changes and cause stalling. My advice here is to datalog the car with its current tune and replicate the scenarios where you want the crackles. Then go into your tune and only modify those areas in the Minimum Spark tables. No other changes are needed to any other tables to make the crackles.
    Wow! Thank you very much for the detailed explanation! I will try it out then reach out if I have any more questions.

  18. #18
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    Quote Originally Posted by Fu03steveC63 View Post
    Wow! Thank you very much for the detailed explanation! I will try it out then reach out if I have any more questions.
    Quick correction, I think I had the Airmass values backwards. Meaning the LT1 has .08, .12 and .16 rows to change and the LT4 only has .12 and .16 rows that need changing. Either way, the logic still holds true in everything I said.
    I've tuned a few things...

  19. #19
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    Quote Originally Posted by TriPinTaZ View Post
    Quick correction, I think I had the Airmass values backwards. Meaning the LT1 has .08, .12 and .16 rows to change and the LT4 only has .12 and .16 rows that need changing. Either way, the logic still holds true in everything I said.
    I was playing with it a bit but was not able to get a decent loud pop. Is it because I don?t have long tune header? I can hear small muffle pops but not aggressive nor loud pops. I set minimum / long spark of 0.08, 0.12, 0.16 to 5 degrees from 16-48K RPM; nothing! Are there other tables where I have to make adjustments as well?

  20. #20
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    Quote Originally Posted by Fu03steveC63 View Post
    I was playing with it a bit but was not able to get a decent loud pop. Is it because I don?t have long tune header? I can hear small muffle pops but not aggressive nor loud pops. I set minimum / long spark of 0.08, 0.12, 0.16 to 5 degrees from 16-48K RPM; nothing! Are there other tables where I have to make adjustments as well?

    Are you changing both of the minimum spark tables? Minimum Base and Long Term.

    If you have factory exhaust and primary cats it will never sound like the car in this video. In facts as mentioned, it is bad for OEM cats if they are ceramic based.