Eprom burning for 1989

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Apr 7, 2009 | 01:57 PM

TJM

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Drifting

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From: Suwanee,Ga

Eprom burning for 1989

I have inherited a AutoProm APU1/APS1 Eprom bruener / emulatro/ect. ect Gizmo.

Looks pretty cute if it works.

After about ten minutes worth of reading, it looks like I can finally tune my '89. Or am I really wrong?

Anyone have advice before I begin this learning curve?

I have down loaded Tuner Pro RT from Mark Mansur and think I am at the starting point?

TJM

Apr 8, 2009 | 03:44 AM

rodj

Le Mans Master

Joined: Aug 2000

Posts: 8,838

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From: Australia

Quote:

Originally Posted by TJM

Anyone have advice before I begin this learning curve?

Lots of reading

Start here
http://www.thirdgen.org/techboard/di...uide-book.html
This is for LT1's but basic tuning theory the same
http://para.noid.org/~lj/PCM%20Tutorial/PCMtutorial.htm
http://para.noid.org/~lj/PCM%20Tutorial/Definitions.htm

3rd Gen Prom site
http://www.thirdgen.org/techboard/diy-prom/
has the most activity and you will get answers so long that you have read the link above and not ask something already covered there.

Basically you datalog your engine to see what it is doing and then do small changes and datalog the effects.
Somethings are obvious and don't need to be logged like fan ON/OFF temps , injector size , idle speed ,etc.

Then you get into the heavy stuff; can change spark advance , amount of fuel

Apr 8, 2009 | 07:10 AM

TJM

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Drifting

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From: Suwanee,Ga

Quote:

Originally Posted by rodj

Lots of reading

Start here

Basically you datalog your engine to see what it is doing and then do small changes and datalog the effects.
Somethings are obvious and don't need to be logged like fan ON/OFF temps , injector size , idle speed ,etc.

Then you get into the heavy stuff; can change spark advance , amount of fuel

Thanks, my Camaro buddy gave me the same info so I will get a "Nay -Nay" from him. But since it's his stuff and he can't figure it out, I won't feel to much pain.

Sounds as if the Equipment is OK and Moates is a knowledgeable guy.

Maybe I am expecting to much from this, but I expect to be able to optimize spark and fuel : throttle issues. Tuning was half the battle pre 1982... ?

It absolutely amazes me how little traffic I see on tweaking the computer after modifications?

I hear endless talk in the TECH section about the minutia of detail about stuff I forgot in 1972? Cams, Hp, Rockers, HP, pistons.Hp . and nobody seems to tune the cars, expecting the computer to just "Do IT"

You guys let me know if I am off base, but you modify the older C4 motor, you pretty much need to Re tune the Chip?

Yes?

TJM

Apr 8, 2009 | 05:04 PM

RWDsmoke

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Joined: Jan 2005

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From: San Antonio Tx

Modifying the timing curve can really wake up the part throttle response. I like to keep a few extra chips onhand. It is possible to fry a chip if you have the programmer on the wrong setting.

I learned to read the instructions before burning. Have fun!!

Apr 8, 2009 | 09:11 PM

rodj

Le Mans Master

Joined: Aug 2000

Posts: 8,838

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From: Australia

Quote:

Originally Posted by TJM

It absolutely amazes me how little traffic I see on tweaking the computer after modifications? and nobody seems to tune the cars, expecting the computer to just "Do IT"
You guys let me know if I am off base, but you modify the older C4 motor, you pretty much need to Re tune the Chip?

MAF is very forgiving ; if you do mods to increase airflow into engine then the airflow meter will register change and adjust tune accordingly up to a certain point where retune becomes necessary.
However by datalogging you can see areas where you can "tweak" to optimise perf or economy
There are some seriously heavy tuners / hackers on GM ECM's over on 3rd Gen.
Remember none of this is from the factory.People have got in and dis-assembled the factory code and written programs to tune
Most C4 guys don't seem to get in that deep ; just send out to one of the proven tuners for a tune. Understandable when you see what you can get into with home tune; steep learning curve.

As a note ;I installed a ZZ4 cam in my '89 with ported intake.Ran excellent on stock tune.
However once I got into dataloging ,I found the spark advance WOT mid range was too much , minor knock counts and the ECM was momentary taking spark out to prevent knock.
You could not feel this SOTP , but you could see it in the logs

Last edited by rodj; Apr 8, 2009 at 09:17 PM.

Apr 9, 2009 | 05:44 PM

TJM

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Drifting

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From: Suwanee,Ga

Quote:

Originally Posted by rodj

........................

However once I got into dataloging ,I found the spark advance WOT mid range was too much , minor knock counts and the ECM was momentary taking spark out to prevent knock.
You could not feel this SOTP , but you could see it in the logs

Well I am sliding down that curve. Day three into the reading.

Time to break something!! Going to try and copy my stock Binary programing fair test run?

I have bumped into a theory that a wide range O2 sensor will help improve Air/fuel ratio. Actually it is pretty much essential if you wish to do so. At least that's how I read it.

$70 dollar part?? I'll have to give it some thought, unless someone actually knows?

TJM

Apr 9, 2009 | 08:43 PM

rodj

Le Mans Master

Joined: Aug 2000

Posts: 8,838

Likes: 31

From: Australia

Can get the stock 165 $6E codes here.
http://www.moates.net/fileman/index....B%206E%2094/6E
If using Tunerpro need 6E xdf from here
http://www.moates.net/fileman/index....neral%20Motors

Need to log in
matesuser
moatespassword

Interesting to compare auto v manual calibrations

I believe for $70 all you will get is a heated O2 sensor.
Ulimately need a standalone WB like the Innovate LC-1 orLM-1
http://www.innovatemotorsports.com/products/lc1.php
http://www.innovatemotorsports.com/products/lm1.php

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