LBSZ28BLOWN

I just received the Latest ver. of 8D tdf for tunercat, Lots of new stuff.
Question:
Are these the only settings that need to be changed to Enable HMSA.
Constants:
Min coolant temp for HMSA.
Min rpm for HMSA.
Max map for HMSA.
Max rpm counts for HMSA. -- (What is this)
Highway spark advance delay timer.

Tables:
HMSA vs. Map

Switches:
? What are these Switches and what do they do:
TCC locked HMS enable check.
4th gear HMS check.
Thanks
Louis

------------------
Louis
Convertable
92 Z28 305tpi Auto
1/4 at 12.99 @ 109.07mph w/Paxton 10psi, Ram air mod,Water methanol inj.,52mm T/B,ASM Large tube runners, ported upper & lower intakes,AFPR,23# injectors,1.6 roller rockers,slp tri-y headers,3in. cat,3in. gale banks cat back system,3.42 gears,17x9 camaro SS wheels, 285x40x17 tires,and much more.
http://www.lbsz28blown.cz28.com

[This message has been edited by LBSZ28BLOWN (edited November 01, 2001).]

Grim Reaper

Try turning off the 4th Gear HMSA switch check. When I initially tried to make the code work, I found that the actual machine instructions did not work an I ended up rewriting all the instructions for testing the conditions to invoke Highway Mode.

After later review, I saw that there is a switch somewhere in the eprom that caused the routine to not work (over and beyond the settings). Since my eprom had all the instructions altered, I could not go back and retest it to find the exact instruction that was causing it to not work, but somehow I recall it being something about the 4th Gear Test.

Give it a try and see if it does. If it does not, then I will post the Hex Codes you will need to alter the programming so you can invoke it. You will need to use a Hex Editor to alter the instructions. I used the "Edit" function of the Pocket Programmer "Burning program" and then just opened, and re-saved the BIN with TunerCat so it would alter the "CheckSum" properly so I wouldn't get an SES light.

Grim Reaper

Here are the following Hex Codes I substituted to make Highway Mode Spark Advance work. You will need a Hex Editor (Edit function of Windows Version of Pocket Programmer works fine too, if you read the file with TunerCat to get the Check Sum right).

The following changes to the hex address in the eprom will: 1) Change the Gear Test (which is the test that doesn't work properly IIRC) and changes it so Highway Mode Spark Advance now tests to see if you are travelling > 40 mph (and you meet the MAP Load and Coolant Temp tests). 2) It will change the RPM test from a "Minimum" to a "Maximum". This will avoid having Highway Mode being invoked while you are in PE (which is possible with the stock routine).

If you wish to alter the speed from 40 mph to something else, just change:
x'Addr 3987 from x'28 (d40 for 40 mph) to whatever speed you want (converted into hex, like 50 mph = x'32.

x'Addr x'old/d'old x'new/d'new
------ --------- ------------
x'3984 x'B6/d'182 x'96/d'150
x'3985 x'01/d'001 x'81/d'129
x'3986 x'40/d'064 x'81/d'129
x'3987 x'B1/d'177 x'28/d'040 <---(MPH limit)
x'3988 x'82/d'130 x'22/d'034
x'3989 x'FE/d'254 x'02/d'002
x'398A x'22/d'034 x'20/d'032
+
x'399F x'25/d'037 x'22/d'034
+
x'39A6 x'22/d'034 x'20/d'032

The stock GM routine does not work and even if it did, it works poorly. The above changes to the instructions will make it work better.

PS: The RPM calc is incorrect. It does not follow the conventional RPM calculation. I found using the "coventional calc" for 2,400 rpm yielded a cut-off of 3,000 rpm. I much prefer the RPM being a max constraint than a minimum constraint. I think it's a dumb idea to allow the HMSA to work at very high rpms.

[This message has been edited by Glenn91L98GTA (edited November 02, 2001).]

hectorsn

Glenn, you are such an asset to this list. When I grow up I wanna be just like you!

Grim Reaper

Hector, when I was trying to get Highway Mode Spark Advance to work properly I realized the true power of the eprom was not just in getting good settings in the tables and constants, but also in actually being able to control the way the instructions actually worked.

That is when I started to dive into the actual machine code and then started to get into Assembly Language Programming. There are a lot of funny "hard-wired" things in the code.

hectorsn

I fully understand what you are talking about. I will start learning the language, just not right now. I see how easy it would be to load more things into the prom, like say a second bar map or IAT correction for spark. Maybe something for nitrous even. Did I say easy.... well, maybe not easy but very doable. In time...