mnem1c

iTrader: (4)

Evening all, i have a 94 WRX JDM Classic with a Z4 ecu which is boosting 1 bar. I know Z4s boost 0.9 bar standard and wondering if my full de-cat is making the car over-boost by 0.1. ?

When i get the funds i will go for a mappable ecu, Simtec or daughter board. i dont 100% trust chips, even tho i have researched Polar chips and other performance chips.

Your opinions will be greatful. Cheers

scoobybry!

iTrader: (2)

the z4 does increase boost matey to 1 bar standard boost is 0.9 bar.

ukscoobies.com

kie

How accurate is your boost gauge? when i had a z4 in my 1995 jdm wrx my boost gauge was showing 0.8 bar which i put down to the inaccuracy of the boost gauge

Northern Nick

iTrader: (1)

A decat and a slightly inaccurate boost gauge would probably do that.

Is the gauge electric or mechanical?

Where does the boost gauge needle sit with the engine switched off. I had one that sat at .2 bar vacuum and the was a £40 mechanical smiths gauge.

dj219957

standard boost for a z4 is about 0.88 bar and as above yes a decat will cause some creap and yes the gauge might be slightly over reading.

mnem1c

iTrader: (4)

Its a mechanical boost gauge and when the engine is off its bang on centre, smooth movment too. Had other turbo cars where the needle flickers, but this one is good.

Can you fit Polar chips to Z4's? Not that im going to do this, just wondering.

scoobybry!

iTrader: (2)

as long as it has the free spot for the chip then yes no probs

WildPikey

Yes you can fit that chip to the z4 and why not? It's a vey good map and is definately worthwhile

Jimbob

iTrader: (13)

Borrowed from a b13bat post elsewhere.

Z4 ECU 1995/1996 WRX
12.7PSI (0.9BAR), DROPPING TO 11.7PSI (0.8BAR) @ 6600RPM.
FUEL CUT 15.65PSI (1.08BAR).
260PS (256 BHP) @ 7250RPM.

Mine is over boosting and is fine off boost, but as soon as you touch accelerator on boost it pops bangs and you go through the windscreen, and the COF light flashes.

Will be unwinding my actuator tomorrow.

R1CH D

iTrader: (8)

James haven't you got sti engine in yours now??? sti cams won't run on a wrx ecu, there is a fair difference in cam profile.

dan83590

Impreza 1993-1996
Impreza 1993-1996 UK/GT/Aus WRX
ECU Code 7D or V7 : 11.47psi (UK Spec/Aus WRX)
ECU Code 6D : 11.47psi (GT/Euro model)

Impreza 1993-1996 UK Prodrive upgrade
ECU Code 7D or V7 : 13.64psi (actually the STi 2 6K map)

Impreza WRX 1993-1994
ECU Code W6, U8 or 2C : 11.47psi

Impreza WRX RA 1993-1994
ECU Code W9 : 11.47psi

Impreza STi 1 1993-1994
ECU Code SA : 14.87psi

Impreza STi RA 1993-1994
ECU Code SB : 14.87psi dropping to 13.64psi (very lean fuelling )

Impreza WRX 1994-1996
ECU Code Z4 : 12.7psi

Impreza WRX RA 1994-1996
ECU Code Z5 : 12.7psi

Impreza STi 2 1994-1996 (inc 555 Sp.Ed)
ECU Code 6K : 13.64psi

Impreza STi 2 RA 1994-1996
ECU Code 7K : 13.64psi

Impreza WRX Wagon 1993-1996
ECU Code 1C, 3B, V9 : 10.5spi (peak) dropping to 6.8psi

Impreza WRX Wagon/Saloon Auto 1993-1996
ECU Code B4, V5 : 10.5spi (peak) dropping to 6.8psi

Impreza STi Wagon 1994-1996
ECU Code SC : 12.7psi (actually the Z4 Map from saloon, as has TD05)

Impreza 1997-1998



Impreza 1999-2000
Impreza Turbo 2000 UK
ECU Code AE800, AE801, AE802 : 13.64psi

Impreza Turbo 2000 UK Prodrive PPP
ECU Code (Sti labelled ECU) : 15.65psi (peak) dropping to 13psi.

Impreza STI Type 5/6
ECU Code AF040 or AF041: 15.65psi (peak) dropping to 14.5psi

Impreza Prodrive P1 1999/2000

ECU Code AG340 : 15.65psi (peak) dropping to 14.5psi

Impreza WRX/STi 2001-2002
Impreza WRX 2001-2002
ECU Code AF530 : 13.61psi
ECU Code AF531 : 13.61psi

Impreza STi 2002
ECU Code AG820 : 16.4psi (peak)

Impreza WRX/STi 2003-2004

Impreza WRX 2003-2004
ECU Code AH751 : 13.61psi
ECU Code AH750 : 13.61psi

Impreza STi 2003-2004
ECU Code AH992 : 16.4psi (peak)
ECU Code AH990 : 16.4psi (peak)

Impreza WRX/STi 2005

Impreza WRX 2005
ECU Code AJ830 : 13.61psi

Impreza STi 2005
ECU Code AJ840 : 16.4psi (peak)

Impreza WRX/STi 2006

Impreza WRX 2006
ECU Code A8DH200Y : 11.60psi

Impreza STi 2006
ECU Code A8DH200Z : 14.99psi (peak)

Impreza WRX/STi 2007

Impreza STi 2007
ECU Code A8DK100Z : 14.99psi (peak)

Feel free to feel in the blanks