nAst1: Progress and Concepts Thread

[robertisaar]

pragmatic? LOLWAT?

everyone switching won't help, however, the work i put into this should make the A1 mask more attractive to even more applications, and if i know what will help do that, i can throw it into the pot of Things To Do.

if i can eliminate the need for an external VVT driver, the VVT 3500/3900s can be used to it's fullest extent for minimal cost and maximum adaptability. if i can manage to get a good pressure control solenoid scheme going, a TCI trans controller would be unnecessary for 4L60E, 4L80, 4T65E, 4T80, etc, and those things aren't cheap, not to mention a lot of GM ECMs actually have better control schemes anyway, something i've been considering just porting from something like the 94-95 4L80E code...

that cover it?

at the moment though, just incredibly precise fuel and spark control.

[Superdave]

i have an 8 bit RPM X 50 variable setup from a 16 bit filtered RPM X 1 value, so i should be able to read up to 12,750RPM, however i really don't feel like running a LHO over even 5400, it just wheezes.

but for a little explanation:

the low VE and spark table uses a RPM X 12.5 variable for increased resolution, the mid tables use RPM X 25 since it offers the most resolution while being able to go up to 5200 RPM, and the high tables use the RPM X 50 variable.

I run a square wave generator to my '7730 test bench to simulate RPM and i can easially change what load the ECM sees.. if you want i could test that bin and see what it actually does.

If your expanded VE and spark tables work as designed and the standard TCC functionality is there with the manual flag turned off i may ditch the DOHC code and run yours. I need to be able to tune the VE and spark up to at least 7200 RPM to get the most out of this setup. The guesswork of a 6400 RPM limit is just too much of a risk.

[robertisaar]

i assume it won't matter that my BIN is based off of BFBD(91 W 4T60 federal emissions), right?

i'm still trying to learn the S19 patch files... should be easy enough to copy it in hex to another BIN as a temporary fix though...

and the TCC works the same as it used to in the wife's car.

i've done some byte swapping the ALDL stream as well, i have the 3D VE calculation in place of CCP duty cycle, normalized MAP in place of A/D MAP, and instead of the BLM cell 0 timer, i have the calculated result of the RPM X 50 variable...

[Superdave]

Have you looked at other masks like $A8 at all for ideas?

as long as a '7730 has enough ram to run the file it should be fine.

[robertisaar]

i've grabbed ideas from a few masks... hell, the lower VE table came from the $DA masks more or less directly.

if the 7727/30 were capable of SFI, i would have ported the N* coolant low/overtemp injector cutting stuff...

i'll have to upload the BIN and the ADX that matches in the morning.

[robertisaar]

ok, here's a quick release with only the VE tables enabled for simplicity of checking the high RPM stuff. the unnecessary EGR related stuff is also gone...

i don't recommend running the BINs in an actual vehicle(well, the BFBD one should be OK, the BFUZ i just literally threw together in a few minutes), this is just essentially to test the code for the high RPM tables.

dave, you should probably adjust the rev limiters, IIRC, they're set to ~6000-6200 ATM, i wasn't sure if you wanted to see if it cut correctly or not at higher RPM(it should, since i didn't mess with that algorithm). i included an auto(BFBD) and manual(BFUZ) BIN so you shouldn't have to do any changing to however your sim is setup ATM.

also included in the ZIP is a matching ADX and XDF.

assuming all goes well, i'll be deleting the file after dave can confirm it's working as intended, so as to not have people running around on old, potentially buggy code.



EDIT: FILES REMOVED DUE TO UPDATES! CHECK PAGE 4!

[pocket-rocket]

You are making waiting for spring much harder... If you need a car that will run over your 6,400 RPM limit, let me know. I'm hopefully going to be able to run up a bit higher in RPM this year (7,150 RPM limit at the moment, and I tend to shift at ~7,100 at the strip), so I wouldn't mind testing this if once it's stable for vehicle use. I've got a set of the 96 DOHC heads and UIM/LIM already, and a 75mm N* TB and CAI in the mail. I've also got plans of getting an Ostrich and wideband this spring.

[robertisaar]

it wouldn't be very hard to basically copy the $DF tables for a LQ1 into the nAst1 mask...

and i've run the wife's car on it for at least a month now with no issues... however, it's a low RPM turd, so i'd rather just wait until dave can run it through his sim rather than risk an engine.

[pocket-rocket]

Hence my "I wouldn't mind testing this if once it's stable for vehicle use" comment

[Superdave]

I left my sine/square wave generator in the shop at work, we were working on a pain field generator a few weeks ago.. haha


i'll bring it home Sunday and mess around with the bins and try to post results that night.

[robertisaar]

i'm confident it will work correctly, however, i can wait.

[Superdave]

Sorry for the delay, i had something happen at work that needed my total attention over the week. i'll do my best to test it this weekend though.

[robertisaar]

no problem for me....

i ran the GP up into the high table the other day, worked great except for two samples of the ALDL, it seemed off to me... only happened at ~5200 RPM though. you may want to check into that when you play with it.

[Superdave]

Well, i finally got around to it.. I wasn't able to get it to log past 6375. I adjusted the limiters as well as the ADX display limits.

attached is the log...


Did you seriously map everything in the disassembly? holy crap man.. haha

[robertisaar]

can you post the XDL dave?

i'm assuming you were only watching the RPM X 25 variable? i have a RPM X 50 inserted in place of another byte in the ALDL stream. when the ECM detects RPM above 5200 RPM, it uses that variable for the table lookups.