95blackWRX

what is the best ecu to get for my 95 wrx importI i want to run same power as i have the now which is a peak of 1.2 settleing down to 1.1. I have a zero sports ecu that is causing car to overboost so need a new one.

johnscooby

hi wot is over boost i have just got my first scooby and i hear a lot about over boost thanks

Gutmann pug

fair question ......

95blackWRX

all i can do is describe what happens to my car. if i am going along at say 40 to 50 in 5th gear sometimes 4th as i accelerate the boost rises then dies down and wont go above 0.5 was told this was overboost causing the car to shut down

Roojai

get a z4, its what is supposed to be in your car and is considered the best jap ecu for british fuel.

Delboy2

The reason that you are seeing 'overboost' is that the map sensor 'tops out' at 17.2psig and you are currently boosting to 1.2bar(17.4psig) - The Zero sports ECU is likely to have an additional chip fitted with a JDM performance chip which will have fuel/Ignition/boost maps to suit running on 100RON fuel so running on UK fuel without additives is likely to cause detonation.
The best ECU's to run (plug & play) are the Z4 & Z5 which have maps very similar to the PPP map so are safe on optimax & Tesco SUL (99RON).
The reason the ECU is only allowing 0.5bar once it has seen 1.2bar is that it has seen overboost thus defaulted to the limp home mode

Cheers

95blackWRX

not sure ur right there is no det with the car

dj219957

how are you sure there is no det? Have you listened with det cans or a via a knocklink? Not all det is audible to the naked ear.

Bubba po

Shh, you'll bring Lewis on to the thread.

johnscooby

hi how can i tell if i have a z4 or a z5 ecu thanks

pslewis

I have no problem with different ECUs

Pete

Delboy2

If you look under the passenger footwell carpet - remove the metal plate you will find the ECU - On the cover of the ECU there will be a code which will disinguish what type it is

Totally agree with dj219957 - The JDM 'chips' invariably run very agressive ignition maps as they are designed to run with higher octane fuel. When running our inferior fuel detonation is likely and as mentioned above if you haven't listened to the engine with DET ' CANS or have a KL fitted how can you be sure as it is not always audible from inside the car?

Cheers