Trebor69

Hello All

I am running a MY93 WRX with following mods

HKS Air intake system
HKS 3" exhuast system, with full decat etc
Dawes Device 1.1bar
HKS FMIC
HKS SSQV Dump Valve
HKS FCD Unit
HKS Boost Gauge
Uprated Fuel pump (new) Warbro
VF34 Turbo - Brand New
Uni-Chip recently mapped at Powerstation

At the moment I have a 7D ECU in this car, and have been offered a Z4 ECU which I know is of the 260 BHP 94-96 WRX model.

I was wondering what the EXACT difference between ECU's ?

Does the Z4 just increase boost a little or has it got better maps etc etc Better Spool up?

Considering I have a Uni-chip installed, running 280 BHP with 240Lb torque at 1.1 bar, would I have to have this remapped if I fitted the Z4 ecu.

I have to make a decision on this ECU pretty quick so please post any helpful info soonio

?? Does anyone know if a 7D ECU is the origional fitted to a MY93 WRX, if not what is it from?

Cheers
Rob White

CustomScoobyIOM

Not worth it as you have the unichip in there and it will screw up your map on there.

Junk the unichip otherwise and get a custom map on your existing ECU from Pavlo.

Trebor69

This is what I thought, I can actucally bridge out the two 'broken' wires to temp disable uni-chip and get it back to standard to say.

This way I could fit the Z4 ECU and get it mapped later.

I was considering going the Scooby ECU route, but due to none being avaiable and my car not fueling correctly, I went the Uni-chip route, also I live 5 miles from powerstation and they do Uni-Chip mapping so was the easy option for me. Any more mods i can just pop in to have it done....

I may still consider the Scooby ECU/pavlo route in future, hence thinking about getting the Z4 ECU for now.

What I want to know is what is fundamental difference between my 7d and Z4 ECu, is it just more boost to get the 260PS or is it more aggressive maps?

If more aggressive/better maps, I would consider doing this and getting uni-chip mapped. I.E does the Z4 provide better fueling down low, better spooling etc etc

I know the Uni-chip reads MAP sensor and piggybacks Crank angle sensor (timing) and MAF sensor (fueling). So would there be any benifit from having a Z4 and Uni-Chip map, compared to 7D with uni-chip map?

Cheers all

Rob

muly

The Z4 ecu has a much better map to it than the 240bhp one, think scott said ,it was they same map used in the prodrive map, had 1 on mine now for about 6 month, and its much better

bainsy

Might find this useful... But couldn't find the 7D???

http://bbs.scoobynet.co.uk/showthread.php?t=317400

Trebor69

Cheers Mate

Yeh No 7D on there, When I brought this car and inquired on here, Somebody seemed to think it was of a 96 UK spec car the 7D ECU....

Anyone on here can confirm this for me?

Pavlo, Bob anyone????

Rob

Delboy2

Yep, 7D is from a UK MY96

Cheers

Trebor69

Cheers Delboy2

So how does the Z4 comapre to my 7D then?

Wasn't the 96 Uk spec the 208 BHP one?

keep replies coming chaps

Rob

fizzled

sorry to hijack the thread mate , im after a z4 ecu if anyone can point me in the right direction, been told it is the one to put in a my93. regards.

bainsy

There is one on ebay mate... Good Luck..

http://cgi.ebay.co.uk/ws/eBayISAPI.d...category=10424

kev 1

hi guys ,ive also orderd a z4 ,but the guy suppling needs the numbers on the yellow part were the plugs go as its just the board iam getting can anyboby sort me out please.cheers

Trebor69

Hello all

Has anyone on here got an idea of quality of map on a Z4 compared to other ECU's?

Will a Z4 work with 1.1bar Boost?

Cheers
Rob

Scott.T

iTrader: (2)

Z4 will have a better map then the UK 7D
It runs 12.7psi as opposed to 11.47psi and has a slighty better fuel/timing maps (but much bettert then an early WRX map)

As mentioned above it was the Z4 map in the Pre96 Prodrive ECU with a few minor tweaks (Prodrive ran 13.64psi)

You may find general round town driving is alot better with the Z4 map.

Fuel cut is about 15.8psi IIRC

You may be able to 1.1BAR with a Z4 and a fuel-cut defender. But please don't try without a Knocklink

Trebor69

Hello Scott

I am currently running 1.1 bar pressure with FMIC using Dawes. I have a HKS fuel cut defender which is set at 1.4 bar. I have no knocklink yet but that is next on my list. What I was thinking was to fit the Z4 with Uni-chip allready and then get it RR and mapped accordingly (obviously checking for knock at same time).

My thinking was this, knowing that the Z4 has a much better map than the 7D I was going to bridge out Uni-chip connections so it is disabled, fit the Z4 and see how car runs. Then Take it to be RR and mapped with Uni-chip enabled.

I know the Uni-chip does alter timing/fueling by offsetting sensor readings.

My thinking again was would it be better to have a Uni-chip tuned Z4 rather than a uni-chip tuned 7D......

Let me know if I am wrong or right here!!!

Cheers
Rob

Scott.T

iTrader: (2)

I'm not really that familiar with how uni-chip works but I guess it's like the majority of piggy back systems and allows you to adjust the base map by a percentage of say 10% either side. i.e advance/retard by 10% and increase/decrease the AFR by 10%.

if it is mapped well, the percentage of adjustment is good enough and the points along the Rpm scale are sufficent then the same results could be achieved using either the Z4 or the 7D.

However, as the Z4 is better fuel/timed then this would obviously be a better starting point

red wrex

I have a MY94 jdm, and i think this has a Z4 ecu

It boosts at 14 psi max with no other mods, is this right??

Its a 260 bhp model