ok, been doing a lot of searching trying to learn about connecting to the ALDL and have a few questions:

1. So what is the difference between 160 and 8192 baud?
2. I have seen different diagrams for building ALDL cables. Is one design better than another? How do I know which one I need or should use?
3. Can you actually buy an ALDL plastic connector somewhere to put on the end of your cable so you don't have to plug the individual wires into the ALDL?? (Just plug the connector into your ALDL)

thanks.

 

1) Speed. The baud rate is the rate of data transfer. 160 baud is VERY slow.

2) The kind of computer in the car will determine what you use.

3) I don't know about that one.

 

So does the slow transfer mean that when reading the info from th port to a laptop that it will not gather data efficiently?? Also, does this mean that the computer actually processes slower (ie. slower to react to changes from sensors etc?)?

I have an 85 2.8. Do you know which one comes in that car??

 

The data rate of the ALDL doesnt determine how fast the ecm handles operations, jsut how fast the data is sent out. The 160 baud means that youll be sending a max of 20 bytes per second where as teh newer ecms with different hardware and 8192 baud can send a max of 1024 bytes per second. Big difference in how fast youll get data. Matters alot if your using it for tuning. The faster datarate is really a must from that standpoint if your using an FI system. AFAIK the carb ecms xmit at 160 baud so youll only need a single transister cable like whats shown with winALDL.

 

The 870 ECM for the 85 TPI cars is 160 Baud as well. I have an 89 computer (8192 Baud) and a couple of No Vats chips (one stock, one not). I need to double check the wiring of the adapter harness I have because a guy with a scanner said my 'A/C was showing to be running when it was off. That's why I'm running the 85 computer again. I've fried too many A/C units since I switched to the 89 computer. I really haven't run the custom chip that much so I need to get my software/hardware act together so I can check this stuff for myself......

 

The 160 baud is like looking at a calendar to tell you what time it is. At one update per second, most events have already been there and gone. ie a throttle blip might be entirely missed.

The 2 transistor version work fine.

 

Will it still log the information in the raw data even though you don't see it occur in the program? Or you just miss the info all together??

Do you have a link to the cable style you are speaking of?

 

I believe this is the cable youll want to build.

 

Each byte transmitted by the ALDL is a snapshot of whatever that memory address has stored in it at that immidiate time. If something is occuring at the same time the byte was origionally stored and later loaded for transmission, youll see it. If it occures between successive loadings youll miss it entirely.

 

Here's a good place to look for stuff if you don't want to build it yourself....

http://www.moates.net/gmecm/hworder.html

 

is there a wiring diagram of the 8162 baud aldl connector needed for datalogging? i have the newer computer and i have yet to find a diagram of how to build this connector.