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  1. #21
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    Quote Originally Posted by GMPX View Post
    You already did a 15.2 1/4 mile right Brian? I wonder if this improvement might just get you in the 14's?
    My Cruze is currently running on 72% E85, oddly enough still getting some knock retard above 8 degrees at WOT, however, exhaust cam position greatly affects this too.
    Are you still using the stock knock balancing rate values in table B1940 and is the knock only above 5200rpm? If so I think there is some false knock occurring based on my test results. I ran out my tank of 93 octane (your 98 RON and filled up with 89 (your 92 RON) and I actually saw slightly higher final timing on the same amount of meth/water injected.

    14s should definitely be possible- I was running the stock transmission calibration when I ran the 15.2 at 21psi boost, but had the ported TB and ported intake manifold installed and I still need to put those parts back on the car. I see ~7% higher MAF readings at the same boost pressure with the ported TB and intake manifold

  2. #22
    Lifetime Member Boost's Avatar
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    Agreed, none of my knock is above 5200 RPM @ WOT. Brian, do you recommend altering B1940 if one is using better than 93 octane or m/w injection?
    - Roland
    GM dealer tech since 2005
    '01 Z28 LS1/T56
    t-tops :usa:
    stock 241 heads, stock cam,
    stock muffler, factory wheels

    8.2 @ 86
    (1/8th mile with 255 Toyo Proxes)
    I am learning...

  3. #23
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    Quote Originally Posted by Boost View Post
    Agreed, none of my knock is above 5200 RPM @ WOT. Brian, do you recommend altering B1940 if one is using better than 93 octane or m/w injection?
    I did not alter this table until after I was injecting meth/water as that gave me the confidence that it was probably not real. I would not hesitate to remove it with E85 either.

  4. #24
    Forum tyhee Site Admin GMPX's Avatar
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    I agree, I think it's false knock, I can run between 5 or 10 degrees around 5,000RPM and it always pulls a few degrees due to knock around here, this is on 73% E85 at the moment too.
    Also, I hit 21 PSI of boost tonight @ 5800 RPM, the car felt pretty good too so I did a 0 to 60 run for the fun of it, UNTIL the stupid ESP kicks in just after the 1-2 shift where the wheels slip a little on the change, it only managed a 7.3 second run to 60 but, the throttle was at 50% all through 2nd gear
    I don't get it, traction control is off, so let the wheels slip a little please.

    I did discover one thing, the temp gauge is the dumbest thing I've ever seen. Just for fun, watch the gauge and have the driver display show coolant temp. No joke, between 88 degC and 108degC there is no movement in the needle, none!!
    Need official EFILive help, please go here.
    For tuning support please post your questions on this forum (or other auto forums).
    Sorry if I don't respond to your PM, don't take it personal.


  5. #25
    Forum tyhee Site Admin GMPX's Avatar
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    Also, I was talking to a tuner of Mitsubishi's EVO's today and he said running E85 they are at about 11 degrees at 5,000 RPM, 15 at 6,500 and up to 18 at 8,000RPM.
    When I get time I am going to experiment by dropping the boost down to maybe 15 or 16 PSI and play around with the timing some more. Because our car is 100% stock (apart from the FlexFuel stuff) there seems no point working the turbo any harder than what it is doing now. I've noticed on high E85 percentages boost is slower to come on too, but the factory FlexFuel spark maps are weird alright, they pull timing down low, that doesn't make sense to me with a slow burn fuel.
    Need official EFILive help, please go here.
    For tuning support please post your questions on this forum (or other auto forums).
    Sorry if I don't respond to your PM, don't take it personal.


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