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    • Porsche 991.2 Turbo S picks up ~8 mph of 1/4 mile trap speed with BMS JB4 only and runs 166+ 1/2 mile

      This is very impressive performance and frankly the dollar to horsepower ratio in the Porsche tuning world can not be beat. A BMS custom picked up almost 8 miles per hour of trap speed in the 1/4 mile with just a JB4 tune.


      That's right. Here is the data from @Payam@BMS:

      Hey guys, had a customer send in some data and runs they got with JB4 only on 98RON Map 4.
      Barely peaking 24 psi.

      Here's stock VS JB4 Map4 numbers:

      10.9s @129 stock
      10.2s @137 with JB4
      Stock:


      JB4:




      The owner can get more with higher octane and a more aggressive map so this is hardly tapped out but the result compared to stock is night and day as is.

      This article was originally published in forum thread: 991.2 Turbo S JB4 Dragy Times started by Payam@BMS View original post
      Comments 15 Comments
      1. Sticky's Avatar
        Sticky -
        8 mph gain JB4 only?
      1. Payam@BMS's Avatar
        Payam@BMS -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        8 mph gain JB4 only?
        Correct! With 98RON fuel on map 4 only.

        With higher octane like Ms109/Racegas using map 5 or 7 will probably yield the 140mph traps in the 1/4 mile JB4 only.
      1. Sticky's Avatar
        Sticky -
        Whose car is this? Can I get a pic of it?
      1. Payam@BMS's Avatar
        Payam@BMS -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Whose car is this? Can I get a pic of it?
        I'll ask the customer to post here Click here to enlarge
      1. onfire's Avatar
        onfire -
        Stout gains !

        With JB4 boost control, why the drop in boost as the rpm increases ? PDK shift safety ?
      1. Payam@BMS's Avatar
        Payam@BMS -
        Click here to enlarge Originally Posted by onfire Click here to enlarge
        Stout gains !

        With JB4 boost control, why the drop in boost as the rpm increases ? PDK shift safety ?
        Correct, we have it taper down a bit because of that. You can see ECU psi is requesting that curve as well, so we follow it.
      1. Sticky's Avatar
        Sticky -
        Interesting it is only 128 stock for the 991.2 Turbo S though.

        I had a guy claiming his runs 134 stock... hard to buy that.
      1. Sticky's Avatar
        Sticky -
        Anyway, going to front page this @Payam@BMS just need a pic of the car to go with it! Click here to enlarge
      1. onfire's Avatar
        onfire -
        Well done ! Do you have the IAT trace for that 1/2 mile ?
      1. Sticky's Avatar
        Sticky -
        This is very impressive performance and frankly the dollar to horsepower ratio in the Porsche tuning world can not be beat. A BMS custom picked up almost 8 miles per hour of trap speed in the 1/4 mile with just a JB4 tune.

        Click here to enlarge

        That's right. Here is the data from @Payam@BMS:

        Hey guys, had a customer send in some data and runs they got with JB4 only on 98RON Map 4.
        Barely peaking 24 psi.

        Here's stock VS JB4 Map4 numbers:

        10.9s @129 stock
        10.2s @137 with JB4
        Stock:

        Click here to enlarge

        JB4:

        Click here to enlarge

        Click here to enlarge

        The owner can get more with higher octane and a more aggressive map so this is hardly tapped out but the result compared to stock is night and day as is.
      1. Payam@BMS's Avatar
        Payam@BMS -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Interesting it is only 128 stock for the 991.2 Turbo S though.

        I had a guy claiming his runs 134 stock... hard to buy that.
        Sounds about right, my TTS did 126mph stock IIRC. The guys that are running 134 are usually 2019 and some factory freaks.

        We tested a brand new 2019 TTS Cab, and it did 128 stock as well.



        Click here to enlarge Originally Posted by onfire Click here to enlarge
        Well done ! Do you have the IAT trace for that 1/2 mile ?
        Of course Click here to enlarge

        Attachment 60388
      1. Blown6's Avatar
        Blown6 -
        I dont know but 25psi seems high to run everyday on a stock motor....
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Payam@BMS Click here to enlarge
        We tested a brand new 2019 TTS Cab, and it did 128 stock as well.
        GPS?
      1. onfire's Avatar
        onfire -
        Click here to enlarge Originally Posted by Payam@BMS Click here to enlarge
        Sounds about right, my TTS did 126mph stock IIRC. The guys that are running 134 are usually 2019 and some factory freaks.

        We tested a brand new 2019 TTS Cab, and it did 128 stock as well.

        145F at the end of the 1/2 is pretty good. Didn’t really drop the timing either. Well done !



        Of course Click here to enlarge

        Attachment 60388
      1. Payam@BMS's Avatar
        Payam@BMS -
        Click here to enlarge Originally Posted by Blown6 Click here to enlarge
        I dont know but 25psi seems high to run everyday on a stock motor....
        VTG guys run 28psi no problems and they make more power than this. Plus, it's barely hitting 25 psi at 165mph+ lol. Average is about 22 psi, which is fine.

        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        GPS?
        Of course. This is stock vs map 3 with e30 blend, can't seem to find the log though Click here to enlarge

        2019 TTS CAB:
        Attachment 60389

        91 Octane Stock
        Attachment 60390

        JB4 Only Map 3 E30 blend
        Attachment 60391