1227165 ecu with custom code much better than stock ecu. (Page 12/26)
Poz FEB 20, 10:26 PM
The ecm is 1227165 out of 91 s-10 2.5 vin e. I have ecm wiring saved and tried to attach. Can't ad link because it is a paid for site All Data
I could e mail the diagrams or if you have another idea ?
So you have not used nvram on this ecm?
chetw77cruiser FEB 20, 11:49 PM
The nvram does work with this ecu, the difference is in the code. There shouldn't be much difference in the wiring department as the ecu hardware determines what goes where.

Send me a PM for my email address.
Poz FEB 21, 08:23 PM
What memcal is necessary for this system? Also do you have a program for tuning through the aldl?
Doober FEB 22, 02:28 AM
How much fine tuning did you have to do to achieve that mileage? What is your final drive ratio? I'm wondering what my mileage would be driving the car in 4th ('87 5-speed)...
I don't have the funds now, but I want to get an EBL for mine (been running one on a TBI-fed, Vortec-headed 383 with a cam, headers, etc. for over a year now) and get some fine tuning done. I already have a WB02 but it's currently simulating NB in the truck... whenever I get the EBL I'll probably move the WB over for tuning.

------------------
-Darren
'87 GT 5-speed
'78 Malibu frame-off project (Vortec'd 350/4-speed)
'92 Sierra rcsb (TBI+Vortec 383/4L60)

chetw77cruiser FEB 22, 01:09 PM
The test mule is an 86 SE with stock 4 speed(3.65 final) and stock size tires, snow tires to be exact.

I had to do relatively little tuning to get this code to match the engine, especially using the self tuning function. Using this to coarse tune the code and then by hand for the fine tuning, things were good. Here is where the increase came from. I advanced timing a few degrees and leaned out the mixture using the lean burn section of the code. With this enabled, I was able to gain 5 mpg over the base tuning. The base tune was 4mpg better than the stock computer.

The test mule is now in Kansas City so I haven't been able to do much with this project lately, hopefully the current owner will speak up about how well this setup is running.

The great thing about this setup is that I can tune form across great distances using nothing but a few data logs. I then send a file to the owner who has a laptop. He then attaches to the aldl port and flashes the new code into the the ecu, taking no more than about 30 seconds. No chips to burn, nothing to take apart, etc.
Doober FEB 22, 01:13 PM
That's what I like about the EBL, it simply hooks up via serial or USB depending on version.
jdv FEB 23, 09:31 PM

Time to fire up the welder.
chetw77cruiser FEB 23, 10:52 PM
Cool. Want to make up a set for the 3.4 TDC that is going into one of my cars?
jdv FEB 24, 07:56 PM
That is 2.25 " to run the stock 3500 manifolds. I will work on headers next.
armos APR 30, 01:45 AM
Like many 2.8 owners, I'm fighting an idle problem that I haven't been able to figure out, and I'm increasingly concerned it's an ECM problem. This 7165 conversion is in the back of my mind as something I might be interested in doing "some day" to fix this thing for good.

I'm in California, so it's important to be able to easily swap back to the factory ECM for emissions testing. I don't know if the inspector would notice the ECM swap when he hooks up to it, but if he did, I'm sure it would be an automatic fail. The draconian laws here don't allow any modifications from what was stock in 1986, regardless of the tailpipe results.

That said, my hope is that the 7165 would not be noticed, and I could get the car tested with it in place. In fact emissions are one of the reasons I'm interested in the swap. Obviously he won't see the ECM visually, but I have no idea what the inspector sees on his screen when he hooks up to the ALDL port. I also wonder if it will behave as expected if he shorts A&B.
All sensors would need to stay in their original locations, just like the emissions sticker shows them. From what I understand, the 7165 will work with the 7170's sensors so that shouldn't be a problem. If the upgrade can be invisible it just might be a good option for residents of this irrational state. And it might even improve emissions and make it easier to pass.


Question:
Has anybody with this swap done an emissions test with it yet? Did your tailpipe results get better or worse compared to the stock 7170? It sounds like it's been tuned pretty well for performance and fuel mileage, but I'm concerned that nobody really has the means to tune for emissions so this is a question mark. The test limits here are pretty ridiculous, way tighter than they were even in the 90s.. for an 80s car that we're not allowed to modify. :eyeroll: