Thread: E85 Conversion... Now I have KR?

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  1. #1 E85 Conversion... Now I have KR? 
    SE Level Member blackgtp95's Avatar
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    I just converted to E85 this week and I now have 1-3 degrees of knock on my 3.4 pulley when I used to have 0 on my 3.2 pulley

    Doesn't seem to make sense to me

    Here is my tune

    https://dl.dropboxusercontent.com/u/...E85%20Tune.hpt

    and here is my 40 min scan (WOT towards the last 10 mins)

    https://dl.dropboxusercontent.com/u/...040%20mins.hpl

    I am fairly new to tuning but I though everything I did was correct

    I scaled my 60# injectors to 42 and that is it, I had the commanded AFR at 11.7 but when I saw 8 degrees of know I moved it back to 11.0

    I should note Histogram 10 is my Wideband

    Any help would be appreciated as I though E85 was a super knock suppressing fuel.....
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  2. #2 Re: E85 Conversion... Now I have KR? 
    Moderator dsmuts's Avatar
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    Stock pump?
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  3. #3 Re: E85 Conversion... Now I have KR? 
    GXP Level Member coolone's Avatar
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    Quote Originally Posted by dsmuts View Post
    Stock pump?
    or at least a fuel pump Rewire... : )

    (just thought to add that, hehe)
    Overkill BBC Cam, YT 1.8 RR's, Rhodes Lifters, STGII Heads, GenV, Pacesetters, 3" Exh to Tips, TEP Trans. N*, ID 75# injectors/E85 coming soon
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  4. #4 Re: E85 Conversion... Now I have KR? 
    SE Level Member blackgtp95's Avatar
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    Quote Originally Posted by dsmuts View Post
    Stock pump?
    No it is a walbro pump

    The strangest part of this is my LTFT are locked at 0.0 all the time and I am not commanding Open Loop
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  5. #5 Re: E85 Conversion... Now I have KR? 
    SE Level Member blackgtp95's Avatar
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    no one has anything for me ? not even a hint?
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  6. #6 Re: E85 Conversion... Now I have KR? 
    GT Level Member
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    Change back to gasoline?! :-/
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  7. #7 Re: E85 Conversion... Now I have KR? 
    GXP Level Member darkhorizon's Avatar
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    what was your commanded timing during and before the KR?
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  8. #8 Re: E85 Conversion... Now I have KR? 
    SE Level Member blackgtp95's Avatar
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    Apparently my tune file was somehow corrupted.... Not really sure went back to an old tune from a few years ago and did "Write Entire" instead of just calibrating and I now have LTFT again and only 1 degree of KR

    I will update after I dial in my LTFT's after I do some logging as they are pegged at 16.4 and after cruising for 20 mins they are going to 10.4 which is terrible and they are not locking at 0.0 when WOT

    Thanks
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  9. #9 Re: E85 Conversion... Now I have KR? 
    SE Level Member Casper00693's Avatar
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    What I did was take the 42.5 inj tables and i added 30% fuel to the IFR table, i adjusted my commanded AFR to 12.2 and i never touched the MAF either but also considered doing some PE adjustments, im not sure why you are knocking on a 3.4 on e85 if u did not knock on a 3.2 i want to say you should review your fuel tables and see where you may have missed something. I was actually able to up my timing quite a bit. And im top swapped on a 3.4mps . view signature. I am running 19* timing WOT w/0*KR I have room for more. When I first messed with E85 i **** myself cause i blew a head gasket! Lets just say i didn't know wtf i was doing when i first messed with E85, so i did some more studying while i switched back to 93 octane again. And now I love it and i love my mpg im getting as well.

    I couldn't begin to give you advice on the hpt tuning as I use DHP. But I have a feeling you need to really just take the #60 tables and ADD 30% to the IFR tables. Good luck.
    L67 bottom end-3.29's-3.3mps-42.5's-E85-SD headers-DHP Tune my own-Gen V-18* timing-AL 104s.
    Soon: Stage 3 p&p heads, 1.9s and #90s.. All sitting for no reason just need installed.
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