A friend of mine just got an old wrx in which he is breaking,and it had some little switch on the dash which altered the idle ?,
when we inspected the cu it is a z4 with extra wires comin out the other side going to this switch?,is this some kind of antilag or somethin?,also says japspeed on the ecu.

 

Have you opened the ecu?
As there may be an extra chip in there

 

no not opened it.

 

its just a switch to run a chipped map or flick it the other way back to standard they are a cheap ebay remap

 

Open it up and see what has been done


this is a piccy of the standard early ecu bottom rhs is where the extra chip can be fiited and normally the J1 resistor is cut to enable the ecu to run the chip.
But as ,ste sti, said most probably instead of cutting the resistor they've put a switch in instead (not sure how though)

 

ok cheers matey,it will be for sale anyway,whats something like this worth £?

 

There not always a 'cheap ebay' item. If the chips done correctly,you can get some good gains. It's a damn site cheaper than a new ecu. As stated, the switch will probably solder to the cut resistor in the ecu to allow switching between maps. I can't see the point really,as the new chip should be mapped for UK fuel,so using the old map could cause problems.Chipping also removes the 112mph limit.
Cost wise,i'd expect £130 ish for the ecu and chip together. Just my opinion mind,im sure i'll be corrected soon!!

Mit

 

unfortunately most probably not ,imo,a lot unless you can determine if the chip (if there is one in there) is remappable or what the map is like (e.g. fuelling,boost etc)

 

got my z4 for 50quid delivered