bobehud Posted November 12, 2009 Report Share Posted November 12, 2009 also it has a GM MAS again,the reason..?Im in the industry i run shops and i am about to take a plung on highly modded 87 and am just curious as to the purpose of the ecu upgrade,i am fairly i understand the whole GM MAS issue. Thanks Bob Link to comment Share on other sites More sharing options...
Robert_n_family Posted November 12, 2009 Report Share Posted November 12, 2009 An 89 ecu helps the car run better basically. I'm willing to bet the ingnition control module (Labled "KNOCK SENSOR") mounted on the drivers wheel side of the engine compartment is from an 88-89 also (Metal box instead of black plastic). These are more reliable from what I've been told. I'm sure a more experienced member will chirp in exactly why, but thats my 2.6 cents! Robert Link to comment Share on other sites More sharing options...
TexasQuest Posted November 12, 2009 Report Share Posted November 12, 2009 The GM mass air is used as an upgrade. It also probably has a MAF Translator. Do you see a little box with dials on it that says MAF Translator on it in pink? Link to comment Share on other sites More sharing options...
dstar88 Posted November 12, 2009 Report Share Posted November 12, 2009 it might already have the 88-89 ecu in the car. did you ask the owner if it does? im not sure if it has better fuel curves in it, but the reason why people swap it out is mostly because, the 88-89 ecu's do not have fuel cut in them. you can boost, what ever you would like with that ecu and it will just throw nothing but fuel at the engine. you will end up out running the stock or 1g mass before the computer. which is why most people put in the maf-t to over come that part, also for the reason of it being tunable. you can swap the internals quite easy aswell, since the 88-89 ecu's bolt up differently then the 87's. Its quite simple to just pop the ecu's open and swap internals out, which leaves for a practically direct plug and play up grade. Daniel Link to comment Share on other sites More sharing options...
DzNutz Posted November 12, 2009 Report Share Posted November 12, 2009 No fuel cut and a lot better fuel map. 89 is the bes but 88 is okay. The 87 would cut early. 86 and earlier is a completely different fuel system. Link to comment Share on other sites More sharing options...
bobehud Posted November 13, 2009 Author Report Share Posted November 13, 2009 well it has both the GM MAF sensor and the 89 ecu.. Link to comment Share on other sites More sharing options...
DzNutz Posted November 13, 2009 Report Share Posted November 13, 2009 Upgrading the ECU lets you run mods like bigger injectors and high flow fuel pumps for more fuel and boost without having to go to a stand alone system. Link to comment Share on other sites More sharing options...
JustPaus_88TSi Posted November 13, 2009 Report Share Posted November 13, 2009 I swear.. You guys and that damn "fuel cut". It doesn't exist(maybe for 86's). The ECU is being fed garbage MAS signals(airflow too fast/much), and has no idea what fuel "plot" to use, so it goes "Durrrrrrr" until you back off the throttle. This is why the 1G MAS is an upgrade of sorts, it doesn't freak out when the airflow speeds up from higher boost, or the volume passing through it increases from a larger turbo. Same thing with the TPS and its "dead/flat" spots, funky TPS voltage makes the ECU think something else is going on, like "throttle plate is closed" when in reality you have your foot through the floor. The ECU fuel maps were continuously worked on over the years. OEM ECU's don't allow larger injectors at all, piggybacks(MAF-T, SAFC, AEM FI/C, Greddy Emanage) do that by altering the only thing our ECU understands, MAS airflow signals. Link to comment Share on other sites More sharing options...
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