Right, quick Q

I have one of these on order, but was wondering what parameters are changed with the scoobyECU? Is it all the open loop stuff?

As in, I know the Z4 ECU is much better than the one in the MY94 WRX, but what about the closed loop stuff?

Would fitting a Z4 to a 94WRX then adding a ScoobyECU be any more beneficial than adding a ScoobyECU to a 94WRX ECU (assuming I wouldn't switch between OE and ScoobyECU maps)

Thanks

Justin

 

Wouldn't make any difference as cutting J1 makes the ECU read the external ROM's (Scoobyecu)

Cheers

 

Well quite! but when does it read the External ROMs? all the time? or is it just the look up table for rpm, boost target, TPS, fuel cut, advance and everything else needed for when in open loop?

What I'm getting at is if the ScoobECU is based on a Z4 map (or any map better than MY94) but with changed parameters, do I get the fueling benefit of the Z4 at all times, open or closed loop?

 

IF you put a chip into the MY94 ECU like yours then the car will run exactly the same as if you had put the chip into a Z4 ECU, at ALL times.

There is no point in getting a better ECU like the Z4 if you are going to put a scoobyecu in it.

 

As has been said it reads all the map from the scoobyecu once J1 has been cut.. there is no other part of the map elsewhere.. open and closed loop use the map off the scoobyecu.

 

The chip not only contains the 'performance' map 'look-up-tables' but the entire running code for the ECU (which is in assember language). The code that the ScoobyECU runs can differ from that on the base board depending on the year of the ECU.

Later ECU's ran better, less buggy, code aswell as better maps. Therefore 'in my case' later code and maps are loaded as the base and then the 'performance maps' are overlaid onto this.

In most cases switching between ECU and ScoobyECU is OK but on the v.early ECU the knock-correction maps were in a different location hence code and maps can get mixed up and it may throw up a CEL.

 

Many thanks to all

 

Sorry for not replying to your pm!

Will check it out.

Paul

 

Thanks Paul

<cough>ScoobyECU</cough>