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| What do I need to access the stock ECU and modify it ? (Page 1/1) |
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LeoLeChat
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APR 13, 09:56 AM
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Hello Everyone,
I ain't a mechanic nor an electronic engineer but I do have a burning passion for my Fiero.
Here in France, Octane 95/98 cost 2.10€/L or + while E85 is around 0.70€/L.
I'm planing to tune my 88 GT 2.8 V6 to accept E85, I'm going to change every hose, fuel pump and most important, the ECU.
Since no french garage want to help me on that because my Fiero was never sold in Europe, well ..
So, what do I need to :
1/ Connect to the ECU
2/ Modify ECU values
As always, thanks in advance ! 
Best Regards,
Leo[This message has been edited by LeoLeChat (edited 04-13-2022).]
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fierofool
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APR 13, 07:52 PM
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I don't know if it will do what you want, but the 1227730 ECU is very tuneable. You might contact Sinister Performance, GMTuners, and ask Ryan. He's the guru at tuning for our conversions.
But a question. Why are you running 95/98 octane The car was designed to run on 87 octane.
http://www.gmtuners.com/
http://www.gmtuners.com/eprom/
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pmbrunelle
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APR 13, 09:47 PM
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| quote | Originally posted by fierofool:
But a question. Why are you running 95/98 octane The car was designed to run on 87 octane.
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OP is in France, which means that he's talking about Research Octane Number.
Pumps in North American display the average of Research Octane Number and Motor Octane Number. This is called the Anti-Knock Index.
AKI = (R+M)/2
95 RON in France is like 91 AKI in North America.
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Il faut noter que le carburant E85 possède un ratio stoechiométrique (de 9.8:1) inférieur à celui de l'essence (14.7:1).
Donc, pour équilibrer le mélange air-carburant, il faut injecter plus de E85. Des injecteurs à plus grand débit doivent être installés.
Par le fait de toujours injecter plus de E85, la consommation de carburant du véhicule augmente, mais pas assez pour annuler les épargnes provenant du prix par litre (selon tes prix du post initial).
Tu verras une diminution de l'autonomie de la voiture à partir d'un réservoir plein.
L'ECU de Fiero comprend deux parties importantes:
1. Le microcontrôleur qui exécute le code.
2. La mémoire dans laquelle les données de calibrage sont stockées, le PROM. Programmable Read-Only Memory.
Pour modifier les données de calibrage, on ouvre l'ECU, et on retire physiquement le PROM de la carte imprimée.
Ensuite, on met un autre PROM à sa place.
Un tuner habitué aux vieux GM peut te préparer un PROM modifié pour ton auto. Ryan tel que mentionné est bien connu dans le monde des Fieros.
Informe-toi si le E85 dans ton coin contient réellement toujours 85% d'alcool.
Quand le taux d'alcool varie de beaucoup, les véhicules sont munis de capteur flex fuel, ce qui permet à l'ECU d'ajuster ses paramètres en fonction du taux d'alcool mesuré.
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fierofool
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APR 14, 08:43 PM
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| quote | Originally posted by pmbrunelle:
OP is in France, which means that he's talking about Research Octane Number.
Pumps in North American display the average of Research Octane Number and Motor Octane Number. This is called the Anti-Knock Index.
AKI = (R+M)/2
95 RON in France is like 91 AKI in North America.
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Didn't know that. When I talk with Proff in AU, we've discussed octane using the US ratings. Just kinda thought it was standard.
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Dennis LaGrua
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APR 14, 10:07 PM
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The Fiero ECM like other GM ECM's of the time use a 32K eprom (2732 P/N) that contains the program. To tune that program you will need an extra chip, a program editor (we use Tunercat) , the tuning file for that specific program, an eprom reader/chip programmer and an eprom eraser.
You remove the factory chip from the ECM, carefully separate it from the carrier, read it then, open the program with your editor, make the changes then plug the new chip back into the ECM. Its a complicated process but with a few tries it becomes easy BUT you must first scan your ECM see where the changes need to be made before reprogramming. There is information about the process on You Tube------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "
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