nAst1: Progress and Concepts Thread

[robertisaar]

that's right..... they essentially flash portions the NVRAM instead of the entire block(except for the initial burn in a programmer), essentially like what is done with OBD2 in case of a bad flash, so it doesn't kill the OS.

they're still running with a 32KB BIN as well... i do need to see what all fat i can trim out of the stock cals.... factory test never gets used, neither does any of the HUD stuff, it just sits there and takes up space and processing cycles to bypass it.

[brian89gp]

That would be cool if it indeed works that way.

It is an aussy setup. They take the possibilities of using a NVSRAM module in place of an EEPROM/Flash chip to new levels.

[robertisaar]

that's the idea. i assume the CS circuit would be what determines which external device is read for any given address.

12p? sounds like an aussy setup(possibly non-factory)? i know some of those guys are wizards with code.

[brian89gp]

well, here is 1.06.
i need my damn MEMCAL back to test the ability to use 64KB BINs(i'm not sure how well my G3 adapter is reacting to it) after some internal modifications to the PCM. GM, for whatever reason, connected 5V to the highest address pin on the MEMCAL connector(essentially only allowing 8000-FFFF to be usable on the PROM, instead of the potential 0000-FFFF range not counting the adresses taken up by the RAM and registers), so i did a quick mod to remove the 5V applied and have it switch as necessary, but i haven't been able to test it yet. this is pretty much a requirement to move much further forward, since PROM space has quickly run out.

Theoretically, would any addresses not in use for IO, SRAM (9396), etc then address #0000-#7FFF on the PROM? How would it handle overlap, eg address #00C6 in RAM and not #00C6 in PROM?

Been dissasembling on 12p yet? Some good idea's there.

[robertisaar]

yes, 7727 and 9396 use the same connectors. if you pop them open and compare them, you'll see that they're identical except for i think 1 IC, that's the 2K of SRAM mapped from 1800-1FFF.

no non-weatherproof version was made.

[caffeine]

Sorry if this is a dumb question, but is the 9396 interchangeable with the 7727 when it comes to the pinouts? And there is no interior version of the 9396?

[robertisaar]

........ wouldn't know, OBD2 is not my area of expertise.

[ga2001532]

Is their a manual bin I can modify to put on my 2001 grand am pcm to make the light work

[robertisaar]

assuming you start off with a manual BIN, it should already be enabled. if it's not coming on, either you have a bad bulb, it isn't wired in or the calibration for the light needs corrected.

[ga2001532]

How can we enable the shift light?

[caffeine]

I've been running 1.05 in my daily driven fiero for about 4 months now but I never did get the idle right (idles rich). Not sure if it has to do with the injectors I'm using though (stock 3500).

[robertisaar]

i've been running various versions before i ever started this thread, if that's any indication.

[Mars]

Is this stuff ready to use ? Can I try it on my setup or are you guys still in the testing phases ? Sorry don't feel like reading 40 pages...

[robertisaar]

All of them control a variable cam actuator on the exhaust side but I'm sure it could be programmed differently for the cam in block VCT actuator.

wouldn't know, about the only thing i can state about the OBD2 PCMs is that i have a general idea of what the hardware inside the PCM is, but as far as writing custom code for them, i'm lost, they use a Motorola 6833x variant, which is WAY different in operation than a 6811 that's used in the later OBD1 PCMs. i'm sure following the program flow via a higher level language would be easy to do, but looking at in at assembly level is challenging, to say the least.




so does everyone else agree the stock manual trans shift light stuff is pretty much pointless?

and that a much better scheme would be to just determine gear via N/V ratio and only have the shift light come on at specific MPHs(or RPMs) in whatever gear?

be much better for performance usage, since you can just plug things into a calculator and choose shift points that way and not have the stupid light coming on all the time telling you to shift at speeds that encourage lugging the hell out of the engine. great for economy, i guess, but not much else.

the new scheme i'm thinking up could also be used for economy, just that's not my primary goal with it.

[caffeine]

This is a little off topic, but I was just thinking the other day about an OBDII pcm that supports a variable cam actuator and I believe also has the same reluctor ring as the LX9+newer 60*v6s. I'm talking about the Vortec 4200 PCM and I believe it's well supported by HPTuners. IIRC the 08/09 engines use the 56-2 or something like that reluctor ring. Also, the earlier PCMs have a 7x reluctor ring. All of them control a variable cam actuator on the exhaust side but I'm sure it could be programmed differently for the cam in block VCT actuator. I just remember this because for a bit I was considering swapping a 4200.