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  1. Replies
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    Is their a different repository that I don't know...

    Is their a different repository that I don't know about? The last few years all I've seen in the hptuners repository are all stock tunes.
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    That would make the pcm and tcm show different...

    That would make the pcm and tcm show different speeds than each other even though they are reading the same speed sensor? I would think adjusting the gear ratios and tire size would make at least one...
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    Its in a C3 corvette so no offroad tires here....

    Its in a C3 corvette so no offroad tires here. The main thing I'm chasing is why the pcm and tcm are not showing the same speed. I'm not worried about pcm speed vs actual gps speed that part is easy....
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    redoing the gear calc made them closer but still...

    redoing the gear calc made them closer but still not the same. Before 10mph was 24 now 10 mph is 13
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    Ok I did that and also doing another write entire...

    Ok I did that and also doing another write entire on the pcm and tcm incase it missed something. It missed the vin one time it jar came out as all "eeEEEeeeeeEe"
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    What do you mean running the speedo calibration...

    What do you mean running the speedo calibration tab?
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    The gauge is something different the problem I'm...

    The gauge is something different the problem I'm asking about is all internal to the pcm/tcm. This is what I'm trying to fix now. The faster you go the further off it is.
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    e38/t42 not showing the same speed

    Any ideas as to why my PCM and TCM are showing different speeds in the log? My speedo also bounces from 0 to 250mph as soon as the car starts moving.
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    Any idea why the pcm and tcm speed is not reading...

    Any idea why the pcm and tcm speed is not reading the same?
  10. Replies
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    That is what I'm asking at one point I had the...

    That is what I'm asking at one point I had the laptop speed within 1-2 mph of gps but neither of them match gps now. I haven't changed anything in the speedo since the file where you changed the...
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    Any idea about fixing the difference in speed...

    Any idea about fixing the difference in speed readings between the tcm and pcm?
  12. Replies
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    2,641

    I might look into picking one up at some point...

    I might look into picking one up at some point for the hell of it. I'm talking about the big clunky tech2 scanner that almost looks like its from the 80s lol.

    So I did get in a short drive between...
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    already did the deed. I can't really do anything...

    already did the deed. I can't really do anything more with it today the car doesn't have any wipers on it and it's about to storm here.

    I've thought about buying one of those knockoff tech2 before...
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    I already have that file downloaded either spend...

    I already have that file downloaded either spend the money to license that file or spend the money for a different tcm either way it's money that has to be spent I guess. Hopefully this will fix the...
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    Can hp tuners change the os on the TCM? if not...

    Can hp tuners change the os on the TCM? if not what do I need the tcm out of to get the correct one?
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    So that 24255281 tcm is not the ticket. shifted...

    So that 24255281 tcm is not the ticket. shifted like crap and has 5 tcm codes. That injector flow change made it super lean everywhere now. I guess if its right now though I should retune the VVE for...
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    This also has a 4" intake tube with a slot maf so...

    This also has a 4" intake tube with a slot maf so that's another thing I've been fighting. I built the motor and sold it to another shop that did the install. The sell price of the motor included a...
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    Not sure. The tag on the pcm from a junkyard just...

    Not sure. The tag on the pcm from a junkyard just says 2009 silverado 4.8 so I'm sure it was a t42 truck
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    I understand flow delta and the "flow multi vs...

    I understand flow delta and the "flow multi vs map" should take care of that right? My question is how does the pcm know that the fuel pressure is changing without a sensor? How does it know witch...
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    So of the 3 TCMs i have here 2 are the 24235341...

    So of the 3 TCMs i have here 2 are the 24235341 and 1 is 24255281 would that last one work with my pcm? I plugged it in and both speed signals read 0 so at least that part looks better but I haven't...
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    Yes it is my wideband is in that bung.

    Yes it is my wideband is in that bung.
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    I set the fuel injector data flat because I'm...

    I set the fuel injector data flat because I'm running a fixed 58psi fuel pressure with no fuel pressure sensor to the pcm. So fixed pressure should be a fixed flow rate right? Their is an offset for...
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    I do have another tcm that I can try. I have no...

    I do have another tcm that I can try. I have no idea what the tcms are out of until I try them. Is their a list somewhere of what os is for what years?

    I'm not really an E38 guy I usually tune...
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    What's wrong with my injector data? Their ls2...

    What's wrong with my injector data? Their ls2 injectors and so far seem to be working decent. As far as I can tell. The wideband readings are not dead on command but seem decent. What tables do I...
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    I might have stumbled upon something If I read...

    I might have stumbled upon something If I read speed from the tcm in the scanner it reads correct if i read speed from the pcm it stays at 158mph. so that might have something to do with it.
    ...
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