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  1. Replies
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    You'll get better responses in the LNF (4...

    You'll get better responses in the LNF (4 cylinder) forums than here. I've tuned a Cobalt with similar functions and was mildly successful in terms of modifying the boost.
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    5,148

    For five years now i've just had my shift speed...

    For five years now i've just had my shift speed tabled zero'd out and shift only on RPM. This is easier to fine tune and the car doesn't care if it has the 18s on or the 26" slicks.

    I burned the...
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    ^^That works on 4l60s and such but it doesn't...

    ^^That works on 4l60s and such but it doesn't work on the 4t65s. These converters are designed to slip to a degree, if they don't have a small amount of slip there will be other issues.

    Try...
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    Old thread....I know. I'd like to change my...

    Old thread....I know.

    I'd like to change my stock 2 bar map to a 3bar map to make my boost gauge (Regal) useful above 14.7psi. I think I'm around 17-18 psi right now and I don't have room for an...
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    2,196

    Thanks, i'll give it a read.

    Thanks, i'll give it a read.
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    DTC descriptions (LNF)

    I'm trying to adjust the DTCs on an TC SS cobalt. We are running a highflow cat and it's tripping the O2 codes, unlike all the LSx/L67/4.3 etc. I've tuned, the DTCs are totally different (i'm used to...
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    Cool build, you really shouldn't have to do much...

    Cool build, you really shouldn't have to do much to it from a stock tune. What program are you using Buick or Pontiac? The stock Pontiac is more aggressive than the Buick (more timing, etc.).

    The...
  8. In the TCC engagement disengagement table, spread...

    In the TCC engagement disengagement table, spread out your lock unlock speeds this will keep in engaged longer with more pedal travel before it unlocks. Example - if it engages and 33 and disengages...
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    That should work yes, however, there are other...

    That should work yes, however, there are other tables in the L67 4T65 PCM that HPT can't control. An example, I tried to disable my TC when it was failing, even after changing the tables we had (such...
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    I typically never save them. I can I guess, it's...

    I typically never save them. I can I guess, it's only the 2-3 shift, don't have a boost gauge hooked up yet but I'd guess 5 psi or so. Right around the shift service light blinks, truck falls on its...
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    Boosted 4.3 bog at wot.

    Tuning my brothers boosted Xtreme 4.3 with a Vortech, custom comp cam, headers and exhaust. I have the maf dialed in perfect, VE tuned, timing decent and it runs a clean 11.5-12.0 at WOT.

    On the...
  12. In the V6 trans tables they max and min need to...

    In the V6 trans tables they max and min need to be variable, setting the entire table to 100 or 50 like the V8 guys do is bad for the V6 TCs, they need to see slip and are designed to slip, 100%...
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    What gear ratio is in the built trans? You'll...

    What gear ratio is in the built trans? You'll need to change that, just guessing if it's from a GTP it'll have 2.93s unless they changed the ratio.
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    Put it on a WB and tune it through the MAF. I...

    Put it on a WB and tune it through the MAF. I have a few 4.3 tunes but i've yet to work on one yet so i can't tell you specifically how the injector tables work.
  15. Zero out your MPH WOT table and let it shift on...

    Zero out your MPH WOT table and let it shift on RPM only, this way if you run a different size slick at the track you don't have to deal with the headaches. I ruined a tranny years ago from rev...
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    Dial your fuel trims in using a WB, adjust lockup...

    Dial your fuel trims in using a WB, adjust lockup and unlock speeds, increase your cruise timing. I still get over 30mpg with my GS that has 3.69s, 3k stall, cam, intercooler, MPS with a 2.6 pulley,...
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    Check your fuel pressure when driving, my pump is...

    Check your fuel pressure when driving, my pump is dieing, idles fine, correct pressure, pull vacuum still ok, when i monitor it when driving it drops hard under boost. I also have a walbro, two years...
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    In the late model cars it is very involved,...

    In the late model cars it is very involved, cluster, radio etc., in his car there isn't much aside from the transmission that involves speed reference. It's as simple as trying it, if it doesn't work...
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    I was going to say it would mess up your shifts,...

    I was going to say it would mess up your shifts, but like you said, having a stick it shouldn't be an issue. Try it, do some quick division to figure out the percentage you are off and adjust by that...
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    Zero out the WOT shift speed column and let it...

    Zero out the WOT shift speed column and let it shift on RPM only, will make tuning the shifts much easier. It also helps when running a different size slick at the track, no need to adjust to...
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    You can pull 3* from the entire table, select...

    You can pull 3* from the entire table, select all, put a -3 in the box up top and hit the + sign. Or use excel

    Or you can drive and see where you are under juice and select those sells and pull...
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    If you're tuning with a wb your curve won't be...

    If you're tuning with a wb your curve won't be "smooth" per say, you'll get small dips and rises, that's ok.
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    They are unattainable speeds, meaning it won't...

    They are unattainable speeds, meaning it won't lock in those areas. Unless you are running a good aftermarket TC I wouldn't lock it under WOT.

    If you are trying to adjust shift speeds, you can't...
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    Put it on a wideband, VE, MAF, Spark, tuning...

    Put it on a wideband, VE, MAF, Spark, tuning trims is not a good idea unless you're playing with the lower side of the maf table, even then, a wideband will do much better.
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    There was just a recent update on the TechII...

    There was just a recent update on the TechII about three weeks ago that as soon as it is plugged in now it takes a picture of it and compares what should be there. From what I read in the report the...
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