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  1. #1
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    Some more G4 dyno runs

    Hey guys,

    Spent the morning getting the CPE catback on our 135i and decided to do a little tuning to see how its working. Overall very impressed with the catback quality and the sound is very nice.

    Few notes:

    1) All runs done on ARCO brand 91 octane. The cheap stuff. Click here to enlarge
    2) Catback gains looked to be around 8rw over the stock catback @ the same boost/octane levels. And a little lighter too. Can't complain there.
    3) The bypass map boost is very close to stock boost levels now. Maybe 1/2psi higher or so. I would expect a baseline of around 295rw fully bolted so between the extra 1/2psi and the dyno conditions we're around 15rw high on the baseline. So the rest of the numbers may be 5-10rw higher than normal.
    4) After testing I'm saddened to report the factory EGT monitoring system is not accurate enough to be used as a tuning tool. It reports ~1400 degrees F at the end of a 1/4 mile run @ 8psi and similar temps @ ~15psi. Bummer. Click here to enlarge
    5) Overall happy with the 13 and 14.5psi maps. The G4 will eventually provide fluid movement from 11-16psi based on autotuning feedback but we have a little more work to do there on the algorithms. Will head back in a week to do some various dyno runs at different octane levels to show autotuning in action.
    6) For kicks I fired up the meth system w/ 600ml 50/50 mix. My flow sensor was misbehaving so had to disable the progressive meth input and lock it in a map for dyno testing. Will get that sorted out soon.
    7) The G4 alpha has 18ohm load resistors in it and a different algorithm so the 18ohms now are similar to 24ohms on the G3 in terms of allowable duty cycle. On the high boost meth mapping it's under targeting 1.5psi on the dyno. e.g. target is 18psi and boost is only getting to ~16.5psi before PWM sits at 100%. Overall, 16.5-17psi max for a default board is about what we want to provide so we're close there. For the race guys you just plug in a resistor pack in to the DB9 to raise the duty cycle limit if you want.
    8) Timing looks good for the heavy water mix and overall I'm happy with the power curve.
    Attached Images Attached Images    

  2. #2
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    Woot!
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    Click here to enlarge

  3. #3
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    ooooohhh.. $#@!s getting real in here!

  4. #4
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    427 with meth on 91 right, nice, very nice.
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    Yes, @ only 16.5psi to boot! CPE catback FTW! Click here to enlarge

  6. #6
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    Wow I may have time to put my cp-e exhaust on by the end of the week... Can't wait to see what 93+meth and 17.5 psi will get Click here to enlarge

  7. #7
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    Looking sweet T!
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    and if no meth?

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    The 14.5psi graph looks awesome.

  10. #10
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    Click here to enlarge Originally Posted by moon999 Click here to enlarge
    and if no meth?
    The first two dynos are no meth on 91 octane.

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    gran trabajo terry Click here to enlargeClick here to enlargeClick here to enlarge
    [SIGPIC][/SIGPIC]

  12. #12
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    Click here to enlarge Originally Posted by SlicktopTTZ Click here to enlarge
    The first two dynos are no meth on 91 octane.
    +1!

  13. #13
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    Click here to enlarge Originally Posted by George Smooth Click here to enlarge
    The 14.5psi graph looks awesome.
    Thanks! Still playing with the air/fuel ratios. I've tried a wide range but keep gravitating back to 13:1 in the mid 11.9:1 up top at the "street" boost levels. On the race gas maps without meth timing is a little more stable @ 12.5:1 in the mid 11.5:1 up top. But once you throw meth on there it's hard to find a difference between 11:1 and 13:1 during short single gear pulls. Will have to get on a load dyno soon.

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    stock turbos right? that is very sweet. the numbers are damn. look at the area under the curve of the torque. its always there, just pulling and pulling.
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  15. #15
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    Yes stock turbos! Full bolt on mods now.

  16. #16
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    Go Terry Go!!!!!!!!
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    nice what hp and nm it is because whp is in usa not in eu?

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    1 out of 1 members liked this post. Reputation: Yes | No
    Click here to enlarge Originally Posted by moon999 Click here to enlarge
    nice what hp and nm it is because whp is in usa not in eu?
    WHP is wheel horsepower. HP would be just horsepower, which is counted at the flywheel, before drive-train loss (for RWD manual, around 15%). NM is a measurement of torque. You can convert those peak torque values to NM if you want. (ft-lbs to nm)

    On meth he made 597nm peak. On 91 he made 537nm peak. Remember, this is WHEEL torque, not flywheel.

  19. #19
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    Click here to enlarge Originally Posted by SlicktopTTZ Click here to enlarge
    WHP is wheel horsepower. HP would be just horsepower, which is counted at the flywheel, before drive-train loss (for RWD manual, around 15%). NM is a measurement of torque. You can convert those peak torque values to NM if you want. (ft-lbs to nm)

    On meth he made 597nm peak. On 91 he made 537nm peak. Remember, this is WHEEL torque, not flywheel.
    Exactly and there you go, all the figures can be converted.
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    so maybe u can convert? thanks

  21. #21
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    Click here to enlarge Originally Posted by moon999 Click here to enlarge
    so maybe u can convert? thanks
    Uh... he converted them for you.
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  22. #22
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    Click here to enlarge Originally Posted by moon999 Click here to enlarge
    so maybe u can convert? thanks
    Please read my entire post. Also, I assume that since you figured out how to sign up and post on this forum, you should be able to find an online conversion program on the internet.

    Google is your friend! Click here to enlarge

  23. #23
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    1 out of 1 members liked this post. Reputation: Yes | No
    Damn that dyno looks so sexy... I keep coming back here just to look at it.
    Some people live long, meaningful lives.

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  24. #24
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    wow thats awesome.
    Click here to enlarge

  25. #25
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    Terry, any chance you could get a race gas only and a race gas + meth dyno? Preferably something like MS109.

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