3rdGenSS

Ok, im finally getting around to getting into the chip burning... i do have all the equipment needed as well as tunercat and winbin etc... been searching and reading and searching and reading more.. to the point where i am getting lost..lol

anyways, i have a fresh rebuilt L98 with iron heads.. .95 LT1 cam...but pretty much realativly stock engine. mated to a 95 T56 6speed. this in my 91 z28 tpi car....

would it be best to start with the stock l98 auto chip and change it to manual and tune from there, or start with maybe a 90-91 vette chip say ARFP or AXCN.. not worried about the oil temp settings as they can be turned off in the switches.. but would i have to change the spark tables or anything else in those chips to work properly to get a good starting point with my set up.
i know that since i am not running aluminum heads i dont want to have the vette spark tables so as to not damage the motor in any way.

also, if using the l98 6-speed vette chip, would this allow use of the reverse lockout on the t56 other then wiring that to the brake pedal or push button switch.. basically wondering if there is a setting somewhere i am overlooking it those bins that my control this.

any ideas, help? or am i way off at this point?

Z69

I might (might) get the MT code into AUJP this weekend.
From what I've seen so far the MT bins have addition IAC code.
Some of it safety related for when an ecm malfunctions.
As an example, it will use a default iac step value if the stored ram value for iac steps is greater than xx.
That's the main one I remember. It's rather tedious to find all the diffs when there are over 150 of them due to the offsets caused by the additional code for the iac.

I'd go with AXCN since it has the most patch support.
Then swap the spark table minimum.
Or swap all the tables for fuel and spark except for the AE stuff.
That's one of the other big MT bin diff's.

Kevin91Z

iTrader: (1)

I've always used an AXXD (305 5-speed G92) chip for MAP manual cars and AUJP (350 automatic) for automatic cars. You can change the injector constant easily and everything else. I'm sure there are things in the manual chip that we cant access yet in our tuning programs, which makes it logical to start with a manual chip, rather than try to change an automatic chip. Besides, what difference does it make where the fuel/spark tables are when you start, as you're going to change them anyway.

3rdGenSS

got a point kevin..... is there any suggestions you would give for a start point using the AXXD ? again this would be with a 350 tpi engine with only variation from stock at this point being a 95 LT1 cam .... just unsure where to start at.. and dont want to do something that my damage the engine at all when i first start. thanks for any help....

Z69

By that logic you shouldn't use AXXD either since there's stuff in that bin you "can't" access yet either. There are lot's of stuff not defined in most of the definition files currently available.
I'll know more when I finish the AXYC compare. (it's similar to AXXD)

And the reason I'm going through AXCN & AXYC is to find all the MT code and make it work in AUJP also. That way "we" only need to work with one SD bin. Not 6-7 like in the past.

Nothing is inaccessible in the bin. Just unclear as to it's function.
And most all the MT to AT diff's I've found are easy to understand using currently available hacs.
AXCN is already a 350 bin and has all the tables preset to a 350.
Just need to swap in diff spark tables. Lot less work than upgrading a 305 bin to 350 fuel and easier to understand. AXCN is richer too.

No reverse L/O that I've seen in the 8D bins.
I'll put that on the list of mods. Skip shift is there though......

3rdGenSS

ok.. so skip shift is there? hmm ill have to look into the AXCN alittle more...might be more what i am looking for.. as for the skip shift, where is that at in it and how can i set it to be used?

Z69

You'll have to get a 6spd vette wiring diagram.
Lots of people don't like skip shift and would rather not have it.
It's for gas mileage. It helps with the CAFE standards for GM.

You can look at both bins. People have ran both.
To me, I'd just rather mod a few tables that all editors have access too. But I suspect most running a 5.0 bin on a 5.7 haven't checked to see what all the differences are. It was mind numbing going thru axcn & axyc to find all the code differences. Out of 1500+ total differences. Only 3 were code sections. All have to do with the IAC. The rest are just calibration differences. AXYC has one more section than axcn.
All the differences show up because the added code causes an offset and all the addressing below it is off at least 1 character so it shows up as a difference. -Mind numbing-

Kevin91Z

iTrader: (1)

How is it so difficult to set up an AXXD for use with a 350 (or larger)? You change two things, the injector constant and the cylinder size, and you're done.

Everything else, like fuel and spark tables, idle, pump shot, etc, you would change anyway no matter what chip you're using.

Z69

91L98Z28

The same can be said of people running a 5.7 bin on a 6.3 (383), 6.6 (400), etc.

I went with AXXD for my 6spd conversion on my 91 L98. Yes, it required tuning, but I think it's as good of a starting point as any. An AUJP converted to be more like a stick cal is still going to need work because things like AE and IAC and timing are still different on a stick car, they just don't drive like a slushbox.

My vote is to use the AXXD, switch the injector constant and cyl size and that will get you up and running so you can start fine tuning.

91GTABird

I found a bin. over a fileman i have been browsing over. Its called 90L98MAN8D.bin. I looks fairly ok but im in no way an expert. Anyone know anything about it. Its might help?

Kevin91Z

iTrader: (1)

That's for a 1990 Corvette.

91L98Z28

don't know anything about it, sorry.

it really is best to start with a "known stock" BIN.

otherwise, if you have tuning problems or issues, you have NO IDEA what's been done to the BIN, what's been changed, if something has been hacked (code wise), you don't have a history/log/revision notes on whats been changed, or why things were changed if they were, etc.

91GTABird

didnt think of it that way. Thats why im called a newbie