AAN ECU eprom for the boost?

**jevrem** · 31 March 2009, 16:01

Originally posted by porkkis

AAN 551A is equipped with different type boost chips. Extremely rare 87c64 versus just rare 87c257.

So i can't use the MRC chips over this ecu because the boost stock chip is difrent from MRC.
What can i do? Is there some solution for my problem?

**spink** · 31 March 2009, 16:45

For the record,i have never had any problems running 87c257 chips in an AAN S4 ecu,same part number as you have there.

**porkkis** · 31 March 2009, 18:42

For the record you're wrong.

jevrem, contact mrc for possible exchange to 87c64. You can try to run mrc fuel with std boost and see - wow - it runs.

**spink** · 31 March 2009, 18:47

I must be hallucinating then

**porkkis** · 31 March 2009, 18:54

You might just have an AAN ECU with swapped cover.
B57764 = 87c64 and the chips are the right way in the first pic.

**spink** · 31 March 2009, 19:04

A mate has the same age S4 with the same numbered ecu(all identical to mine) which had never been opened prior to being chipped and it is using a 87c257 and it runs very well on them also.So who knows

**jevrem** · 31 March 2009, 20:49

I send the mail to MRC about exchange of boost chips. Now i have to wait the response.
If I put the MRC fuel chip and leave a stock boost chip, is there any chance to damage the motor?

AAN ECU eprom for the boost?

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