Are there any flash-based 4 cylinder ecms available in the US market? I am looking at things similar to the P66 V6 ecm and the $EE LT1 units, but I need to run a N/A 4 cylinder of 2.3l. I was thinking Quad-4 stuff, but flash-based is a requirement-chip burning is just not gonna happen.
Yes, and no. There is an EEPROM based ecm used in the 93 and some 94 Cavaliers with 2.2 and manual. Code is simple and not part of the EEPROM. There is also an OBDII flash ecm used in Daewoo cars (it's a Delco that mounts inside the car) but I don't know if its been cracked yet. There's also the 97+ Cavalier / Sunfire 2.4 pcm family which (I believe) is supported by HPTuners.
I'm looking for OBD-1/OBD1.5 ECUs that are programmed over the ALDL cable. OBD2 ECU's are simply too expensive to recommend to customers for EFI conversions, and chip burning is an extra cost beyond the initial ECU swap.
I'm also looking into Nissan and Toyota products, to see if any of those are suitable.
Four cylinders didn't get a lot of advancement until they were forced to go OBDII. They were "economy" engines and cost saving strategy seemed to include not upgrading the controller unless necessary.
The 93 EEPROM ecm is programmed through the ALDL. Another EEPROM version was used in the Geo Storm.
Some of the OBDII ecm's I listed above seem to be selling inexpensively.
http://www.ebay.com/sch/i.html?_odkw...m&_sacat=33596
http://www.ebay.com/sch/Daewoo-Nubir...1362181/i.html
The issue isn't the cost of the ECM, it's the cost of the tuning solution. *Nobody* wants the initial investment, and for 90% of the conversions OBDII is just not needed.
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