LS1 Boost OS - Development

For discussion and distribution of custom code and hacks
Boostedforlife
Posts: 60
Joined: Sat May 22, 2021 4:39 am

Re: LS1 Boost OS - Development

Post by Boostedforlife »

Okay finally got my fuel pump installed and flows good. I have a bin that seems to be okay but I have to have the ve table passed 150 for it to even start and ideal. 6.0 2156 os. Decapped injectors and gt45 turbo.

Got it started and seems to be okay but I have to jockey the throttle to get it to rev. If I just punch the throttle it will start to rev but afr will flat-line high at above 93-95 kpa. If I jockey it passed that I will boosted 7-10 psi easy.

Any thoughts/advice?
bubba2533
Posts: 498
Joined: Wed Apr 11, 2018 8:50 am
cars: 03 Chevy S10 Turbo V6

Re: LS1 Boost OS - Development

Post by bubba2533 »

It sounds like the tune is really far off, but it's hard to say.

I would post this up in the tuning section as I doubt it has anything to do with the custom OS.

My recommendation would be to take it back to as close to stock as possible to make sure it's running good mechanically. So put the stock injectors, map sensor, and stock os/tune and make sure it runs well.
LS1 Boost OS V3 Here. For feature suggestions post in here Development Thread. Support future development ->Patreon.
bubba2533
Posts: 498
Joined: Wed Apr 11, 2018 8:50 am
cars: 03 Chevy S10 Turbo V6

Re: LS1 Boost OS - Development

Post by bubba2533 »

Well, I'm going to work on the next big version of the Boost OS and I'm trying to nail down the features that I want to add.

I would like to add a change that will allow a leaner AFR for the Ethanol Open Loop EQ Ratio vs Gasoline EQ Ratio. I found out that this wasn't possible when I had my truck on the dyno.

I want to add a basic open loop boost control. I'm thinking the easiest way is to do a 3D lookup table of duty cycle with one axis being RPM and the other MAP. On top of that I would add a minimum TPS and minimum MAP to activate the boost control solenoid. It would be set to 0% duty cycle otherwise, which I think is similar to how most standalone controllers would do. Also some sort of an overboost cut although I'm not sure what kind.

I've also been thinking about adding wideband closed loop fuel correction. This would also allow for a boost control AFR safety cut.
LS1 Boost OS V3 Here. For feature suggestions post in here Development Thread. Support future development ->Patreon.
bubba2533
Posts: 498
Joined: Wed Apr 11, 2018 8:50 am
cars: 03 Chevy S10 Turbo V6

Re: LS1 Boost OS - Development

Post by bubba2533 »

Another thing I wanted to do was modify the MAP PID to log 0-255 kpa
LS1 Boost OS V3 Here. For feature suggestions post in here Development Thread. Support future development ->Patreon.
kojab
Posts: 440
Joined: Sun Mar 22, 2009 11:52 am
cars: VT V6 supercharged in a corolla
Location: Sydney
Contact:

Re: LS1 Boost OS - Development

Post by kojab »

I changed location 80814 in OS 7603 bin from 14 FF 63 08 36 3C 14 FF
To 53 FC 63 08 36 3C 53 FC


Also changed EFILive setting C6301 Map Sensor Scaler to hex 3C 00 at Bin Location 195B8

Our RTLS1 uses formula: Operation:= DIV
Factor: = 508.0
Offset: =-1.6

Hope it helps

Original poster: tkelly2784 viewtopic.php?f=26&t=6734&hilit=Reverse ... 603#p99919
8SecSleeper
Posts: 6
Joined: Sun Mar 12, 2017 3:57 pm

Re: LS1 Boost OS - Development

Post by 8SecSleeper »

delete
Last edited by 8SecSleeper on Tue Nov 09, 2021 1:55 pm, edited 1 time in total.
bubba2533
Posts: 498
Joined: Wed Apr 11, 2018 8:50 am
cars: 03 Chevy S10 Turbo V6

Re: LS1 Boost OS - Development

Post by bubba2533 »

8SecSleeper wrote:So, bug report, tested on a 2000 SS camaro, Clutch pedal check worked fine off the line. But once it's launched and the rpm hits the FFS limit, the ign cut activates. Even when no pedal besides the clutch pedal is pressed.

I looked at the code and can't see why thats happening. Maybe clutch pressed value is stored elsewhere in memory once your moving?

Also I think theres an issue with this math. Correct me if I'm wrong.


move.w ($FFFFB544).w,d0 ; main cycle count?
sub.w ($FFFFA24A).w,d0 ; Looks cycle count since launch
mulu.w #$10,d0 ;Multiply by 16, likely the cpu is 16 mhz
cmpi.w #$2800,d0 ; Assuming this number should represent 4000 ms for 4 seconds, but 0x2800 isn't 4000 ms, instead it's 10240ms
bcc.s loc_2DBB2
tbls.w (launchRetardTimeTbl).l,d0
add.w d0,d1

My research shows a 16 mhz processor does 16 million loops a second or one loop every .0000625 ms. So 100 ms would be 1.6 million cycles.

I'm just trying to make sense of the math, mainly because the launch retard timer didn't seem to be accurate.

Also seems the b544 counter is a purely a second counter, So that should mean the resolution is missed as it goes up, it's only updated once per second.
I’ve bench test and verified on my vehicle that everything works for the 7603 OS except for the clutch switch because I have an automatic (so Manual LC and FFS) because I don’t have a stick shift car.

Please list what base OS you are referring to. Also do you have a tune and log that shows it not working correctly?
LS1 Boost OS V3 Here. For feature suggestions post in here Development Thread. Support future development ->Patreon.
8SecSleeper
Posts: 6
Joined: Sun Mar 12, 2017 3:57 pm

Re: LS1 Boost OS - Development

Post by 8SecSleeper »

delete
Last edited by 8SecSleeper on Tue Nov 09, 2021 1:56 pm, edited 2 times in total.
bubba2533
Posts: 498
Joined: Wed Apr 11, 2018 8:50 am
cars: 03 Chevy S10 Turbo V6

Re: LS1 Boost OS - Development

Post by bubba2533 »

I don’t have a P01 pcm to do any testing on or I would try to replicate your issue on the bench.

You have the stock wiring for the clutch pedal? If you could log the clutch pedal switch that would verify the address.

Log this address (0xFF9F28) and press and release the clutch. Start the log with your foot off of the clutch.

It's possible I have the logic inverted because I had no vehicle to test on.
LS1 Boost OS V3 Here. For feature suggestions post in here Development Thread. Support future development ->Patreon.
8SecSleeper
Posts: 6
Joined: Sun Mar 12, 2017 3:57 pm

Re: LS1 Boost OS - Development

Post by 8SecSleeper »

delete
Last edited by 8SecSleeper on Tue Nov 09, 2021 1:56 pm, edited 1 time in total.
Post Reply