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Thread: single injection tune

  1. #1
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    single injection tune

    Can someone share a decent single injection tune I can look off. I'm having trouble with correcting the timing with no pilot.

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    Will need to advance timing to get it running smoother once pilot has been pulled

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    Hey Jim

    Would the timing calculator work for him with a single event tune?
    2011 Camaro 2SS Convertible L99 Bone Stock for now
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    Quote Originally Posted by Jim P View Post
    Will need to advance timing to get it running smoother once pilot has been pulled
    If I just zero the pilot pw will that just turn it off or do I need to shut off the pilot fuel quantity

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    Like with post, only need to zero out quantity to turn off the pilot. Fueling will want to bump up slightly and timing turned up till it starts running smoother. I wouldn?t really worry about a timing calculator.

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    So I did a little research and looked at some logs for idle with a single injection tune and at idle at 13mm3 it is about 6-7* with a slight decrease in rp but I dont know what timing/rp to run while driving. Do I just advance it even more or more fuel? Does anybody have a single injection tune they have messed with or know about one?

  7. #7
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    So I wrote the tune and everything is well except for the start up is lacking a little. I understand it would be a little slow due to not having pilot but it seems to have a little bit of a hickup right after it starts, it will crank, struggle a little bit then it spikes (thats the 1000rpm) and then it goes to normal idle. The first log is advanced timing to 30mm3 and the second is 50mm3. I did this because I thought that since it reaches 50mm3 during cranking it would be better but I think I actually made it worse by giving it less time to advance the timing from -3* to 5*.
    single_injection_3_startup.hpl
    single_injection_3_startup_2.hpl
    My tune if anyone was wondering
    single_inj_3.hpt

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    Different tables are used during cranking

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    Quote Originally Posted by Jim P View Post
    Different tables are used during cranking
    Yeah my crank timing matches what I'm seeing and as soon as it goes to running it advancing a lot but I dont want to mess with crank timing. Do you think that running rough condition could be from just the rapid increase in timing?

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    If it smoothies out after releasing from cranking mode and everything settles out, possibly a portion of it, is it smoother during a hot start versus a cold start?

  11. #11
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    Quote Originally Posted by Jim P View Post
    If it smoothies out after releasing from cranking mode and everything settles out, possibly a portion of it, is it smoother during a hot start versus a cold start?
    when I had the tune on it was basically a hot engine because I loaded it and messed around a little after I got home from work but the next morning I started it cold and I did not hear the single injection tune, a few minutes later while I was inside I heard it idling quite odd almost like a lope and it was just billowing out white smoke, a lot of it. I quickly shut it off and tried to put it back to stock and of course it would not want to load and was giving me a controller init failed error. I left it and drove another car and after I got home I started it and moved it around back it ran fine with no single injection sound and then I got around the block i started to hear it and a little bit louder. I parked it and it started to smoke a little bit more than it was when I drove it around. I shut it off and then tried a couple things to try and get it to flash but no cigar. Finally when I was about to do a pcm reflash with my J2534 I got it read with hptuners and set it back to stock. I have no idea why it ran that way and I couldnt log it because it wouldnt connect to the mpvi. I previously wrote a single injection tune and it did the same thing (also tried running it in cold conditions) my guess is that maybe it had a timing or fuel correction that threw off my original tune.