Fiero Turbo - ECM tunning

[yeyo_racing]

I'm going to start this thread in order to continue pursuing a worthy solution for tuning my Turbo engine setup in my Fiero.

See this thread for past details-> http://60degreev6.com/forum/showthre...Spark-plug-gap

I have decided to go the GMPCM tuning route for now using an Ostrich 2.0 with TunerPro RT. So far I have the software, .bin file, .ads file and .xdf file. I have configured the Data log option and it's working fine. The only hardware pending for tuning is the Ostrich device, which I will be buying in a couple of weeks.

However, while I wait for that to happen I want to familiarize myself with the Tables, Constants and Flags that need to be modified in order to get it to run as it should. So far I have read two topics with a lot of good information regarding the use of TunerPro and tuning.

These are:

http://www.v6z24.com/jbodyforum/tuning-faq-t102758.html

http://www.v6z24.com/jbodyforum/how-to-tune-tgp-code-t88684,highlight,tune+tgp+code.html

Aside from the information provided in these topics, is there anything else I need to modify to have my engine work as intended? How can I scale the map table for a 2 bar map? Is it just a matter of selecting the flag?

This is for a modified 2.8 Iron Head Fiero engine. The stock ECM number is 1227170 running with bin fba1819 and mask $24 (stock ECM).

Any input will be greatly appreciated.

[Joseph Upson]

Do yourself a favor and switch to code58, or 59 if you get rid of the distributor. You would have to change the wiring to that of the Syclone/Typhoon or 89-91 Chevy Beretta using the 730 ECM but it would be worth it in the end. You would have the ability to run 8F turbo Grand Prix or 58/59 Syclone/Typhoon boosted code. More importantly, you would have the benefit of a knock sensor which you will not have without use of the proper external module necessary for knock sensor use with the 24A bin that you need for the Fiero. That's 24A not 24. 24A has a 2 bar Map table, 24 does not although it has the 2 bar switch from what I recall. The knock sensor control is built into the chip for the vehicles I mentioned. You must also make sure you have a chip (calpak) for a V6 engine.

A very fine function for Code58/59 is Autotune which will take an awful lot of guess work out of your tuning process by taking your datalogs, processing them and providing suggested corrections to your fuel table. It also has a cell follower so that you can see what cells on the table you are viewing the ECM is using to calculate fuel delivery or spark timing. This helps when you are tracking down detonation for example when reviewing a datalog.

http://www.code59.org/index.php

If you still intend to press forward with the 24 bin, I've never used Tunerpro while working with it, but I did quite a bit using Tunercat software (http://www.tunercat.com/) which I believe is better suited for it although both programs have their strengths, tcats been around longer. I actually used both programs when working with TGP 8F code because there was an error with setting the rev limit in Tunerpro and access to a different fuel injector constant in Tunercat. I'm using code59 now and am making very good progress toward a stable tune.

[Jonpro03]

Before I decided to use megasquirt, I was going to use code59. It looks very interesting, I also have a local friend who is running code59. There is a lot of information on code59's website.

[yeyo_racing]

Do yourself a favor and switch to code58, or 59 if you get rid of the distributor. You would have to change the wiring to that of the Syclone/Typhoon or 89-91 Chevy Beretta using the 730 ECM but it would be worth it in the end.

Joseph,

I wish it were that simple. Bear in mind this is a 1st gen Iron Head engine (Stock Fiero one), thus it doesn't have provisions for a crank sensor and it doesn't have the reluctor ring on the crank either. I do know there's a workaround to mount an external crank sensor, however I don't know of anyone besides the author that has done this with success. Not to mention the fact that it relies on the bond trueness of the harmonic balancer ring. That means I will need to find a 2.8/3.1 block and a 2.8 crank from an Aluminum head engine and swap the parts. Unfortunately, I don't see that happening anytime soon.

See details here. -> http://www.fiero.nl/forum/Forum2/HTML/103834.html

What I would like to do for now is tune it with the stock ECM and have it run as good as possible. Don't get me wrong, I value your advice and I will more than likely follow that path, but not now.

[Joseph Upson]

Joseph,

I wish it were that simple. Bear in mind this is a 1st gen Iron Head engine (Stock Fiero one), thus it doesn't have provisions for a crank sensor and it doesn't have the reluctor ring on the crank either. I do know there's a workaround to mount an external crank sensor, however I don't know of anyone besides the author that has done this with success. Not to mention the fact that it relies on the bond trueness of the harmonic balancer ring. That means I will need to find a 2.8/3.1 block and a 2.8 crank from an Aluminum head engine and swap the parts. Unfortunately, I don't see that happening anytime soon.

See details here. -> http://www.fiero.nl/forum/Forum2/HTML/103834.html

What I would like to do for now is tune it with the stock ECM and have it run as good as possible. Don't get me wrong, I value your advice and I will more than likely follow that path, but not now.

Code59 is a distributor based code from the syclone and typhoon 4.3L V6. The challenge was making it work with DIS successfully, so it pretty much is that simple if you have a distributor in place. It's mostly used with a distributor.

[yeyo_racing]

Ooooh, I see. So code 59 and 58 are basically the same just one is for Dist and the other for DIS?

[yeyo_racing]

Also, can I use a 7749 ECM instead of a 7730? I think I can get a good deal on one.

[Joseph Upson]

Ooooh, I see. So code 59 and 58 are basically the same just one is for Dist and the other for DIS?

Actually I believe it's code59 to signify modified 2bar 58 code to 3bar. DIS came later after the problem with why it did not work properly was figured out.

Also, can I use a 7749 ECM instead of a 7730? I think I can get a good deal on one.

The 749 as you've probably already figured out is the ECM it was developed on and both will work.

[yeyo_racing]

I have done some reading on the code 59 site and even registered myself. Interesting stuff indeed.

I will be posting in their forum with the details on my build to see which .bin file they recommend. For now I have downloaded the .XDF, .ADS and a stock SyTy 59 .bin file to look at it in TunerPro.

My question is, does anyone here knows of someone that runs this code on an 60 degree Iron Head engine? Can you forward me that contact so that I can ask him for a copy of the code?

[Joseph Upson]

Generally you would try to find the closest bin on the 59 forum to what you are starting with. Since it was designed for the 4.3L and there are very few running smaller engines, there's not likely to be anything close to what you are starting with, so you may need to choose a bin and take a percentage approach to reducing the fuel table based on the difference between the engines to get a decent start. Sixshooter is the closest I can think of with an inline iron head 2.8L Datsun. You'll have to ask him for the distributor version of his code as he is running DIS now. It's listed on the forum as distributor but I'd confirm that with him.

With his bin you'll have to switch the speed sensor (VSS) from optical for a start to calibrate your odometer depending on what trans you're using. I use the F40 so I needed the SGI-5 from Dakota Digital, there's also the DRAC module that the OE code used. In your case you'll probably be okay except for the pullup circuit you'll need by Darthfiero I believe on the Fiero forum if you're using a Fiero tranny. The VSS input should go according to the 89-90 Beretta diagram, as I tried C6 which the DRAC feeds into for the OE speed signal input for the SY/TY but nothing registered until I switched the input to that for the Beretta B10. Once calibrated I may be able to use B11(4000ppm out) with Darths' pullup circuit to feed the odometer instead of having to run a second wire from the SGI-5 as this arrangement did work without the SGI but it was so far out of calibration as a result of the 56K ppm from the F40 instead of the 4K ppm it was expecting that the odometer reacted violently to the point of dislodging the needle from the gauge.

I just need to calibrate it now and then I'll address the actual odometer as 59 uses vehicle speed for several parameters.