Thread: DHP help 04 GTP

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  1. #21 Re: DHP help 04 GTP 
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    I don't know if it works that way with 04+. My car would drop below the 9's in AFR and no matter what I did in the MAF it would still dip really low. I finally set the PE AFR and it hasn't dropped that low. I went and set everything back and the AFR dropped below the 9's again so I set it back the PE AFR (12's) to what I had it when it wasn't so rich and it's holding. I don't know what's different but there are some things that don't work on 04+ cars for some people. Like injector Skew. It didn't do anything, but Industrial Fish says it worked fine in his car. I had to adjust the IFR to get my car to run correctly, and so did Chrism1.

    Jeff
    An engine is an engine no matter the size.... I think Dr. Seuss said that... or maybe it was Big Weld....
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  2. #22 Re: DHP help 04 GTP 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    I don't have DHP so I couldn't say why some things may seem different.

    I never had a issue setting the AFR to 11.5 and then disable all adder tables. Add vs RPM vs Time table I zero out.

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  3. #23 Re: DHP help 04 GTP 
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    Like Jeff said. 04+ ones are a little funky. Injector skew was always a hassle for me, runs a million times better once i adjusted ifr. On basically a stock table for my maf with my IFR adjusted it was almost perfect.

    But a buddy's car who I helped tune took to the injector skew like a fish to water. Why? it was a 97.

    As far as your AFR, without a wideband you don't know what it really is. So just set it to what you want it at and then get a wideband.

    If you're on 93, set it somewhere around 11.5-11.8. IF you're on E85, go lower like 11.0 or even 10.7, 10.8 range. I have my PE set to 10.8, Most WOT runs I end up in the 11.0, to 11.1 range. Close enough for me.

    Also, if it goes to a 10 something afr and you're getting knock then there is another issue. With that much fuel you should drown any KR out. Check your timing, and TCC lockup settings.
    Last edited by chrsmi1; 08-18-2016 at 03:14 PM.
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  4. #24 Re: DHP help 04 GTP 
    Killa Bee Scottydoggs's Avatar
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    export your dhp scan as a csv file, and email it to me. i cant really read that file you linked. but from what i see your lean. and you never went wot in the scan.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  5. #25 Re: DHP help 04 GTP 
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    I also need to fix when PE gets used, I am hitting boost sometimes without PE being enabled.

    Sorry, that was an excel file with formatting to highlight any events I rendered important. I just dropped in the csv version into the folder Scotty. I went to 100%TP At rows 866 and 1108, (3:19:917 & 4:14:177)


    Also chrs, I need to do some reading on how TCC lockup settings affect knock. I didn't know that was even a factor. And I have read in a few forum posts that running too rich will cause knock, especially if you're in the low 10's.

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  6. #26 Re: DHP help 04 GTP 
    Killa Bee Scottydoggs's Avatar
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    unless you have a wb hooked up there the a/f reading means nothing on your scan. its not actual.

    pe enable is a folder in PE, its likely set to 40% throttle then it enters pe. other then know when it enables, your scans not showing it it either.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  7. #27 Re: DHP help 04 GTP 
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    Quote Originally Posted by Scottydoggs View Post
    unless you have a wb hooked up there the a/f reading means nothing on your scan. its not actual.

    pe enable is a folder in PE, its likely set to 40% throttle then it enters pe. other then know when it enables, your scans not showing it it either.
    That's not entirely true though, because the PE table changes the Commanded AFR when it is enabled. I was under the impression that the PCM would use that commanded AFR to calculate how much enrichment to provide given PE mode is enabled. Am I wrong in saying that?

    Another note on over richening the mixture possibly causing knock:

    If you have a given air boost level, and you pump a lot of extra gas into the already hot cylinder, wouldn't the cylinder compression pressure spike possibly too high, thus causing knock? That's a point that someone made on the forums somewhere else.

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  8. #28 Re: DHP help 04 GTP 
    Killa Bee Scottydoggs's Avatar
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    you wont see it entering pe on the scan tho. you only know its in pe mode when you know your tp% it enables.

    if you dont have a wb installed, your a/f scan means nothing really, thats all commanded and not actual.

    if you tune via the ltft, thats the best your gonna do at this point woth out a wideband.

    dont adjust your injectors, they are stock. you can only tune the maf at this point to control the trims and a/f.

    and id put the pe rpm vs time folder back to the file you snagged from the db bin.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  9. #29 Re: DHP help 04 GTP 
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    Hey guys,

    Im 99% sure I bricked my PCM. It froze up at 86% on a flash and then the car rebooted like it was finished, but DHP said that there was a connection error. Then no start. Nothings easy for me these days lol. I'm about to run to the junkyard and grab a PCM but I need to know if there will be any issues ahead of time. I'm sure this answer is somewhere, but can I just grab any 04+ grand prix PCM?

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    Last edited by nickolaughagus; 10-01-2016 at 02:52 PM.
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  10. #30 Re: DHP help 04 GTP 
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    06+ were wonky, probably won't work with DHP.

    04-05 are the only ones you can really use, and while you're there grab the stuff to make an off board. Obd2 plug from inside the car and the PCM plug, blue one on the left IIRC. Just grab them all to be safe.

    Then a +12vDC power supply from almost anywhere and build yourself an off board. Stop bricking PCMs lol

    04 GP GT2: Handling upgrades, go-slow parts, and an attitude. Totaled.
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  11. #31 Re: DHP help 04 GTP 
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    Lol thanks man. I will definitely be making an offboard today too

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  12. #32 Re: DHP help 04 GTP 
    Killa Bee Scottydoggs's Avatar
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    if you have a cold air intake the pcm is in the open and easy to get to. you could run two alligator clips for the power to the off board and clip them to your battery for power.

    the key to not bricking the pcm is to never turn the key off if it failed for any reason. leave the key to on, and try to load another known good bin file. never turn the key off unless DHP says programming complete.

    if you had a lit cel, that can also make it act up. always clear codes if any are active. then flash or read.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  13. #33 Re: DHP help 04 GTP 
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    I saw that DH knows how to unbrick a PCM apparently. Is there a method to the madness? I see many people ask the same question but there's usually never a clear answer. Also, I have tried to make an offboard but it doesn't seem to communicate with the PCM properly.

    I set it up according to the following diagram, minus the CAN connections.



    Also, I may have gotten an incompatible PCM from the yard. It was from an NA 05 GP. I was able to read it but not write.

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  14. #34 Re: DHP help 04 GTP 
    Killa Bee Scottydoggs's Avatar
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    http://www.grandprixforums.net/threa...ness-99-and-04 this thread has the how to i followed, i listed what one i used from the list in the thread, its been tested good on a 04 gp pcm. read and wrote to it no problem.

    na-sc pcm dont matter, as long as its a 04/05 pcm you should be ok.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  15. #35 Re: DHP help 04 GTP 
    Killa Bee Scottydoggs's Avatar
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    the obd2 port also needs the wires moved around, they are numbered on the back side of the plug of most.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  16. #36 Re: DHP help 04 GTP 
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    04+ Offboard harness:
    You only need the blue connector and it's pin 7 for the ground.

    Blue PCM connector

    Blue connector 7 = ground
    Blue connector 20 = 12V Unswitched
    Blue connector 18 = 12V switched
    Blue connector 19 = 12V switched
    Blue connector 1 = CAN+ (if you want to support CAN flash)
    Blue connector 2 = CAN -
    Blue connector 15 = VPW Serial Data

    OBD II Connector

    OBD II Connector 4&5 = Ground
    OBD II Connector 16 = 12V unswitched
    OBD II Connector 6 = CAN +
    OBD II Connector 14 = CAN -
    OBD II Connector 2 = VPW Serial Data
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  17. #37 Re: DHP help 04 GTP 
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    Yeah then mine is wired up correctly. I just plugged the new PCM into the car and now it doesn't even read. I guess it's back to the junkyard then

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  18. #38 Re: DHP help 04 GTP 
    Killa Bee Scottydoggs's Avatar
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    i did unplug the battery on the 04 first, took only the blue plug off, then used the off board.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  19. #39 Re: DHP help 04 GTP 
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    I thought i bricked my impala's pcm. Swapped to my spare for a week then put the "bricked" one back in and it worked no problem. It was weird.
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  20. #40 Re: DHP help 04 GTP 
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    I got 2 more 'airboxes' from 2 different 04 Grand prix's last night. Both of them flashed immediately with the offboard. So we're good to go! Now it's back to searching for a wideband



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