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Thread: Started 'tuning' my 4.2L I6

  1. #1

    Started 'tuning' my 4.2L I6

    Made my 1st changes today.
    I attacked the torque management tables.

    Engine torque management:
    Under Torque Reduction: Normal, completely zeroed out this table.

    Transmission torque management:
    Under Torque Reduction: Normal, completely zeroed out this table.

    Download went well, took 2 long minutes to 'write' ??
    My Z28 'writes' in 20 seconds.

    Will check out these changes on the drive to/from school tommorrow & report back.

    Next change will be WOT AFR.
    Since this product is new, there really isn't a lot of parameters to change yet.
    There's enough to get in trouble with, & enough to make some BIG changes with...

    Dave
    2009 HHR SS automatic--- 350 HP - 450' LBS TORQUE,http://www.youtube.com/watch?v=mDZgoSN8Gk0
    Mostly stock - K&N air intake, TTech engine mount, 2nd cat 'cored', E47.5 tune, Lighter - wheels/tires/rotors.
    13.0's @ 110MPH, street tires, 12.28 @ 112.67 best on slicks, 1.7s 60' ETs

  2. #2
    HP Tuners Support
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    Bill@HPTuners's Avatar
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    hmmm...did you do a rewrite entire or just a write calibration? the I6's I've read were just 512kb meaning time should be the same as ls1's
    It doesn't have to be perfect, it just needs to be done in two weeks...

    A wise man once said "google it"

  3. #3
    the write times are slower for the I6 due to the file layout and the half-a$$ed way GM has done recovery capabilities. Bottom line is for recovery to work we have to erase and write more of the PCM than the LS1. Same for most of the L4 cars and the I5/6 trucks (except the later model ones that use the newer PCM).

    We'd prefer recovery works than faster write times on the older PCM hardware.

    Chris...
    I count sheep in hex...

  4. #4
    No need for 'write entire'...

    My file is 442 KB ?
    Or is it, when I chose 'properties' size of file is 452,208
    on my 1998 Z28 file size is 460,036
    Is this ok ?
    No problem when doing 'write calibration'
    Last edited by 2000Firehawk; 05-10-2006 at 09:18 PM.
    2009 HHR SS automatic--- 350 HP - 450' LBS TORQUE,http://www.youtube.com/watch?v=mDZgoSN8Gk0
    Mostly stock - K&N air intake, TTech engine mount, 2nd cat 'cored', E47.5 tune, Lighter - wheels/tires/rotors.
    13.0's @ 110MPH, street tires, 12.28 @ 112.67 best on slicks, 1.7s 60' ETs

  5. #5
    HP Tuners Support
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    Quote Originally Posted by Chris@HPTuners
    We'd prefer recovery works than faster write times on the older PCM hardware.
    is that some new form of austrailian gibberish?
    It doesn't have to be perfect, it just needs to be done in two weeks...

    A wise man once said "google it"

  6. #6
    ha ha

    Maybe i meant to say "I prefer slower write times than frying PCM's"
    I count sheep in hex...

  7. #7
    Ok, I started looking at some other files & changed alot of stuff last night.
    Replaced low-octane table with stock high-octane table.
    Added +3 to all values on the high-octane side.
    Leaned out all WOT values by 1.0 AFR.
    Replaced all part throttle shift points with the same values that I have in my Z28. With a small increase in throttle, trans downshifts into the next lower gear so your always in the torque zone. A well known programmer 'Steve Cole' developed this, & I just made some small adjustments to it. It works very well. Below are the table values. Try it on any 4L60E. It will be easier if I emailed you my file as the HPTuner file site isn't setup for these new engines yet.

    1 > 2 shift
    8.00000 9.00000 10.00000 11.00391 12.03125 13.21094 14.87500 17.44531 20.92578 24.65625 27.94531 30.54688 32.65625 34.55859 36.39063 38.19922 40.00000

    2 >3 shift
    16.00000 20.01953 24.03516 28.04297 32.04297 36.03906 40.01953 43.99219 47.94531 51.87109 55.76172 59.60547 63.39063 67.11328 70.78125 74.40234 78.00000

    3 > 4 shift
    23.08984 28.69922 34.33203 40.00000 45.72656 51.50000 57.33203 63.20703 69.12500 75.07031 81.03516 87.01172 93.00391 99.00000 105.00000 111.00000 117.00000

    2 > 1 shift
    6.00000 7.00000 8.00000 9.00000 10.01172 11.10156 12.51563 14.68359 17.71875 21.03125 23.96484 26.31641 28.26563 30.03125 31.71875 33.36719 35.00000

    3 > 2 shift
    12.00000 15.53516 19.04688 22.51172 25.91016 29.23828 32.48047 35.64063 38.71094 41.69922 44.59375 47.39844 50.10547 52.73047 55.28125 57.77344 60.23438

    4 > 3 shift
    20.07813 24.78906 29.51172 34.25781 39.02734 43.83203 48.66797 53.53906 58.43750 63.35938 68.30078 73.25000 78.20703 83.16406 88.11719 93.06250 98.00000

    My 4.2L is real happy with all the changes, & is running very well.
    Below is the 'history' of all the parameters that I changed.

    Engine
    Fuel Control
    Power Enrich
    Power Enrichment
    Power Enrich Enable TPS vs. RPM
    Power Enrich Fuel Base vs. ECT

    Spark Control
    Spark Advance
    Main Spark Advance
    Main Spark vs. MAP vs. RPM, High Octane
    Main Spark vs. MAP vs. RPM, Low Octane

    Torque Management
    General
    Spark Retard
    Retard vs. RPM vs. % Torque Reduction

    Transmission
    Auto Shift Speed
    Part Throttle Shift
    Shift Speed vs. TPS vs. Shift - Normal
    Shift Speed vs. TPS vs. Shift - Performance
    Shift Speed vs. TPS vs. Shift - Cruise
    Shift Speed vs. TPS vs. Shift - Hot
    Wide Open Throttle Shift
    WOT Shift Speed vs. Shift - Normal
    WOT Shift Speed vs. Shift - Hot
    WOT Shift RPM vs. Shift - Normal
    WOT Shift RPM vs. Shift - Hot

    Torque Management
    Torque Reduction
    Torque Reduction vs. Torque vs. Shift - Normal

    Engine
    Torque Management
    General
    Spark Retard
    Retard vs. RPM vs. % Torque Reduction

    Transmission
    Torque Management
    Abuse Mode
    Trans Abuse Mode Torque Reduction vs. RPM
    Torque Reduction
    Torque Reduction vs. Torque vs. Shift - Normal
    2009 HHR SS automatic--- 350 HP - 450' LBS TORQUE,http://www.youtube.com/watch?v=mDZgoSN8Gk0
    Mostly stock - K&N air intake, TTech engine mount, 2nd cat 'cored', E47.5 tune, Lighter - wheels/tires/rotors.
    13.0's @ 110MPH, street tires, 12.28 @ 112.67 best on slicks, 1.7s 60' ETs

  8. #8
    Glad to hear you are having success!

    Ken's 2002 Trailblazer I6 has also received a large wake-up call
    I count sheep in hex...

  9. #9
    Senior Tuner Mep_q8's Avatar
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    nice to hear! I can't wait to get my Refund from Westers and try this out! I'm over on the Trailvoy.com forums as well so I've been looking at ur posts too...Do u think you will be taking any dynos of the tunes yet?

    Plus, I was also thinking about maybe using an LS1s transmission settings as it is the same transmission! But I was worried that I'd blow it up, please fill us in on how it shifts and drives...

    How much TM did u remove?? I think once I get mine, im only gonna keep 25% from 1000rpm up toll 3000rpm, then move it down to 10% and gradually get lower.. would you think this is a good idea??

  10. #10
    It will never see a dyno.
    Just a family SUV, I spent the $100 to maybe get some better gas mileage, also to make it shift/run the way it should, & maybe learn some more 'tricks' with this 'tuning', that might help me with my Z28.

    It shifts & drives really well with the sdame shift points that I ues on my Z28.
    I did take all of the torque management out, & compined with my part throttle shift program, I don't see any problems occurring.
    2009 HHR SS automatic--- 350 HP - 450' LBS TORQUE,http://www.youtube.com/watch?v=mDZgoSN8Gk0
    Mostly stock - K&N air intake, TTech engine mount, 2nd cat 'cored', E47.5 tune, Lighter - wheels/tires/rotors.
    13.0's @ 110MPH, street tires, 12.28 @ 112.67 best on slicks, 1.7s 60' ETs

  11. #11
    Senior Tuner Mep_q8's Avatar
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    hey firehawk, just wondering if you've done anything else to your tune??

    I was researching over some of the posts in this forum and found that by leaning out the VE tables at higher rpms actually give's you an extra "umph" in acceleration...

    Should be getting my refund anyday now, so hoepfully once I order HPTs it won't take longer then 2 weeks to arrive here...

    could u post up some info on what u did to the spark retard? I heard that by adding to much current through this option can actually damage the engine coils... As you can tell, Im a big time newb in need of some help!!
    Last edited by Mep_q8; 05-14-2006 at 08:23 PM.

  12. #12
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    Ive done alot of tuning on my I6 so far and got about a plus 2 miles a gallon with just the TM change and some added spark at crusie. Adjusting the VE will not do anything for fuel millage as i have tested it alot. Im going to try and adjust the Inj. Vs RPM table to see if that will help me to gain a 15+ afr at highway cruise. Any other ideas would be appr. from the HPT gang.

  13. #13
    HP Tuners Support
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    unless your running closed loop I would assume the computer would always aim for 14.7:1 no matter what values you pop into your injector, maf or ve tables...the maf & o2's will always try their best to get back to 14.7:1
    It doesn't have to be perfect, it just needs to be done in two weeks...

    A wise man once said "google it"

  14. #14
    Senior Tuner Mep_q8's Avatar
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    Well I'm based in Kuwait, so mileage is not a porblem for me at all.. Im want to squeeze as much performance out the I-6 as possible and safely do it!

  15. #15
    Quote Originally Posted by Trailblazin'
    hey firehawk, just wondering if you've done anything else to your tune??
    Nope, not yet. I just got some Ground Force 2" lowering springs for the rear I've got to install.

    Quote Originally Posted by Trailblazin'
    could u post up some info on what u did to the spark retard? I heard that by adding to much current through this option can actually damage the engine coils... As you can tell, Im a big time newb in need of some help!!
    I didn't touch the spark retard yet...
    Last edited by 2000Firehawk; 05-15-2006 at 03:49 PM.
    2009 HHR SS automatic--- 350 HP - 450' LBS TORQUE,http://www.youtube.com/watch?v=mDZgoSN8Gk0
    Mostly stock - K&N air intake, TTech engine mount, 2nd cat 'cored', E47.5 tune, Lighter - wheels/tires/rotors.
    13.0's @ 110MPH, street tires, 12.28 @ 112.67 best on slicks, 1.7s 60' ETs

  16. #16
    Quote Originally Posted by LSR
    Ive done alot of tuning on my I6 so far and got about a plus 2 miles a gallon with just the TM change and some added spark at crusie. Adjusting the VE will not do anything for fuel millage as i have tested it alot. Im going to try and adjust the Inj. Vs RPM table to see if that will help me to gain a 15+ afr at highway cruise. Any other ideas would be appr. from the HPT gang.
    Hay LSR,
    Could you send me your "tuned" file so that I can compare with mine?
    I've send mine to you to check out.
    I think that we're the only ones that have this program so far...

    Thanks,
    Dave
    2009 HHR SS automatic--- 350 HP - 450' LBS TORQUE,http://www.youtube.com/watch?v=mDZgoSN8Gk0
    Mostly stock - K&N air intake, TTech engine mount, 2nd cat 'cored', E47.5 tune, Lighter - wheels/tires/rotors.
    13.0's @ 110MPH, street tires, 12.28 @ 112.67 best on slicks, 1.7s 60' ETs

  17. #17
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    Ill try and send it over tonight. It picked up some pretty good power and the shifts are alot stronger than before. Im still working on the fuel thing but it still seems to be around a +2 gain at this point.

  18. #18
    Senior Tuner Mep_q8's Avatar
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    BTW, what model TBs/Envoys y'all running??? mine's a 2002 and i know i don't have a MAF, i've got the ITS (intake temperature sensor). Does this mean I'm held back from doing some stuff, or is this actually better???

    Plus I have custom headers coupled with no CATs, its alll magnaflow straight though mufflers....When i switch the car on, i can smell "petrol"... could this mean im running to lean or rich already without any tuning?? and could this be a problem easily fixed????

  19. #19
    2004 Isuzu Ascender 4x4 , 7 pass model...
    2009 HHR SS automatic--- 350 HP - 450' LBS TORQUE,http://www.youtube.com/watch?v=mDZgoSN8Gk0
    Mostly stock - K&N air intake, TTech engine mount, 2nd cat 'cored', E47.5 tune, Lighter - wheels/tires/rotors.
    13.0's @ 110MPH, street tires, 12.28 @ 112.67 best on slicks, 1.7s 60' ETs

  20. #20
    Tuner in Training
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    2003 GMC ENVOY SLT, FULLY LOADED. The tune really helped alot. Im sure you could use a tune to fix your fuel smell. Are you using HPT yet? The I6 file is pretty much complete with all the features you could need. I hope they add a few more like O2 Switch Point so that i can get the MPG a little better yet. How long is it taking for the cal to program in your trucks? Its taking mine about 7 min so far. Im not sure what the deal is.