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Type: Posts; User: dimented24x7

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  1. Replies
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    259,242

    No, since the SFI PCMs have small saturated...

    No, since the SFI PCMs have small saturated injector drivers rated for no more than about an amp. The earlier ones for the CPI had larger peak and hold injector drivers for the low-z injector. If you...
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    MAF only works well when set up properly. You...

    MAF only works well when set up properly. You will need a short ammount of enrichment during hard throttle transitions as the MAF has a transient response both due to the sensor and the method used...
  3. What are you using to tune? HP Tuners encrypts...

    What are you using to tune? HP Tuners encrypts their bins (for obvious reasons), so you cant hand edit the tables with a hex editor. I dont know if theyre defined in HP Tuners, but they should be...
  4. I finally got some time to play around with the...

    I finally got some time to play around with the car some more. I was wrong about how they fired. When I compared what I found with the function generator to the software code, it was obvious that the...
  5. Actually, I think I may have found it. Purely by...

    Actually, I think I may have found it. Purely by accident, of course. Can never find these things when you actually look for them:rolleyes:.

    There are two tables that appear to control the...
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    Trickflow has 14.5 ohm high resistance injectors...

    Trickflow has 14.5 ohm high resistance injectors up to 36 PPH. Im using them with my vortec setup. If you wanted to use the original PCM and wire harness those along with a good aftermarket EFI...
  7. Well, the blackbox is actually working pretty...

    Well, the blackbox is actually working pretty well. In MAF only fueling w/ SD on sudden transients, the AFRs track the desired within +/- 2% in open loop, which is about as good as it gets.

    Money...
  8. Actually, the blackbox PCMs dont have any true...

    Actually, the blackbox PCMs dont have any true transient fueling routines for MAP enrichment. Well, they sort of do with the transient airmass matrix, but theres no temperature compensation with...
  9. I took a look around in the code, and from what I...

    I took a look around in the code, and from what I can tell, the 98/99 black box PCMs dont support the option to control when the injectors fire (anybody know for sure?). The only code I could find...
  10. Im pretty sure it is lean. You are right in that...

    Im pretty sure it is lean. You are right in that the reported AFR isn't trustworthy at low speeds, but the engine also acts lean. It stumbles and bucks in the area where the AFRs appear to plummet....
  11. Is there a way to control when injectors fire?

    Im wondering if GM ever included a way to control when the injectors fire relative to TDC? I know in some of the old OBD 1.5 PCMs, there was a way to do it, but I have yet to find it in my 98 vortec...
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    Ok, so I was playing with some seed/key pairs...

    Ok, so I was playing with some seed/key pairs presumably posted for the '411 LS1 PCMs, and just by looking at the seed/key pairs a pattern became apparent. With some scribbling I came up with the...
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    I actually tried the RR in a blackbox. Its VERY...

    I actually tried the RR in a blackbox. Its VERY difficult to package within the case and requires modifications to the RR unit to make it fit. I did get it to work for a time, but ran into trouble...
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    Ive seen that thread (good read, BTW). The info...

    Ive seen that thread (good read, BTW). The info there is also within the PCM itself when you examine the OBD routines. But, there is still the sticky point of the seed/keys. When the PCM is socketed,...
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    Yes, I realize that you support it. But, the...

    Yes, I realize that you support it. But, the level of control that Im looking for is typically well outside of whats offered by most commercial tuning packages (no offense). I actually hacked the OBD...
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    I decided to return to this. I never really did...

    I decided to return to this. I never really did persue writing or working on any flash utilities. But, Ive been tuning with only a pocket programmer, which is the most painfully sloooooow way to...
  17. Thread: tbi swap

    by dimented24x7
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    6,275

    Sounds like it needs tuning. You can tune those...

    Sounds like it needs tuning. You can tune those with a G1 adapter + programmer from moates.net. There is also datastream and prom definition files for those for Tunerpro RT (tunerpro.net). Theyre not...
  18. Replies
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    For some info on the 98/99 PCMs, check out this...

    For some info on the 98/99 PCMs, check out this page on diy-efi.org. In the bottom, they have schematics for the PCMs with the pinouts listed in each schematic. Somewhere I have complete pinouts for...
  19. Found out what it was that was causing all the...

    Found out what it was that was causing all the backfires. It was how the injector driver sampling was set up. GM only allowed certain other drivers to sample the pulsewidth under transient conditions...
  20. Anybody ever try tuning the transient airmass stuff?

    Im using a vortec blackbox PCM on my setup. Its similar to the early LS1 PCMs in that it uses the transient air calculations along with the MAF/SD logic for deriving the cylinder airmass. I disabled...
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    I can post the pinouts tomorrow for the 98...

    I can post the pinouts tomorrow for the 98 computers. Dont know what the 97's are, though.
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    There are three firing modes in the PCM:...

    There are three firing modes in the PCM: TBI/batch/bank fire. The memcal mod is needed to tell the injector drivers when to fire. The injector drivers for MPFI are software driven using the timer...
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    Is there any bias between each cylinder bank? Or...

    Is there any bias between each cylinder bank? Or are they in good agreement with each other? Are the NBs new stock ACDelcos, original, or aftermarkets?

    The slight lean operation may also be due...
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    The easiest way to get the binary is to remove...

    The easiest way to get the binary is to remove the flash chip and place it in a reader. These can be had for < $300 (see my post on how to do it). Many tuner packages (HP tuners included) encrypt the...
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    The code itself is actually stored as machine...

    The code itself is actually stored as machine code. These are the instructions that basically 'tell' the processor what to do. Typically, the calibration (constants) is stored at the head of the...
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