StickyMicky

i am a touch confused now, ive been led to belive the my97 wrx has a fuel cut set @ 1.2bar

my mates uk car cuts much lower then this, my car has never cut, never EVER

until today

the fuel cut on my car is 1.45 bar
do any of the STI models have a fuel cut this high? or has my car been "fiddled" with in japan, or is it just plain broken?

john banks

Check the MAP sensor doesn't have a pressure leak, this would make it under-read - your very owm unintentional fuel cut defender.

Also look for voltage clamping devices and chipped ECUs.

T-uk

does it not have to also be held for 2seconds, or something before cutting?

edit to add, if it was an electronic type gauge, the stored peaks can be very sensitive. so although it says 1.45 it could have been just over what you expected, for long enough to trip the cut.

[Edited by T-uk - 1/3/2004 3:40:22 PM]

caz1562

I was under the impression Import STis had a higher limit compared to the Import WRX's

StickyMicky

yes it was being held for a few seconds each time i tested it

all connections look fine, i removed the dump valve today and the car really seams to be flying up through the gears, but when i did my tests it was plain holding it in 3rd and give it throttle and see if it cuts, not blasting up through the gears

where should i be looking for these voltage devices?
i have previosly taken the lid off the ecu to see if it was chipped or simmiler, this was becuase it puts down 1/4 mile times which are stupidly fast for a nigh on standerd spec car (at that time it was modded very, very slighty)

should i be looking around the MAP sensor or the ecu?
could the map sensor be faulty?

StickyMicky

caz
my model year comes with a lot of the sti parts as standerd, which makes it even more confuseing

caz1562

Boost Targets & Fuel-Cut Limits
WRX/STi Saloon ECU's 2C, U8, W6, W9 - As above, 11.47psi held to redline. Fuel-cut 14.57psi

WRX (1995/96) ECU Z4 - 12.71psi, dropping to 11.78psi @ 6600rpm. Fuel-cut 15.65psi.

UK/Aus/Euro ECU's V7, 7D and 6D - 11.47psi, dropping to 9.47psi at 6600rpm. With Fuel-cut @ 14.87psi

UK Prodive ECU - 13.33psi (peaks to 13.64 @ 5600rpm, drops to 12.71psi @ 6600rpm). Fuel-Cut 15.65psi.

STi RA (1996) ECU 7K - 13.17psi (peaks to 13.64psi @ 5800rpm). Fuel-Cut 15.96psi.

WRX Wagon ECU V9 - 10.55psi dropping to 6.84psi (starts to drop @ 5000rpm). Fuel-Cut 13.79psi

Z4 and UK Prodrive map are near identicle, with the Prodrive Map running slightly more boost.

IMHO the Z4 ECU is the best stock WRX ECU you can get, as it has much tidier fuel and igntion maps. Comparing it to the earlier ECU's I'm suprised the earlier cars run at all.....

A Z4 ECU will also run fine in a UK and give near UK PPP performance.

caz1562

I know the feeling m8 cause my car's the same. Bloody Japs

StickyMicky

mine is a 97 model car

not sure what it would be on that guide above, but i normaly run 1.25 bar without a hitch but with my experiments today it ended up going a bit to high

johnfelstead

i would love to help you, but as you never helped me you can swivell. http://www.scoobynet.co.uk/bbs/threa...hreadid=286900

scoobynet comunity in full effect.

StickyMicky

pmsl

i added that as i knew it would get under peoples noses

StickyMicky

tell me john, where exactly do you want "swivel`d"

johnfelstead

cant tell you that, that would be too helpfull.

StickyMicky

lmao

ill ask them peeps on the sidc site, if they know where u want swivel`d then

Leslie

Funny how these things come home to roost Mickey!

Les

StickyMicky

ive just checked a rouge email acount and found a mail from john asking where the NF was from

no wonder he got so shirty about it
pmsl

greasemonkey

Rouge? Rogue?

johnfelstead

greasemonkey

Have you been sending him red letters again John?

johnfelstead

scary what you will do for a bit of NF.

Welloilbeefhooked

iTrader: (3)

Micky, my 97 WRX maintains boost at 1.2 bar and cuts now and again. I can only put this down to spiking and it only does it after cruising off boost and then flooring it. Seems to cut just above 1.2 bar.Its got a JAP ZeroSports ECU upgrade though.

Ps You still messing with the boost via your dawes? Do you get any waste gate creep on part throttle or boost at part throttle. I cant decide if I should get one.Hmm?

[Edited by Welloilbeefhooked - 1/4/2004 10:07:17 PM]

greasemonkey

If things are getting that bad old boy, I gather they sell it on street corners in some of the dodgier areas of Manchester. Not sure the dealers accept payment in kind though!

harvey

iTrader: (48)

If you have not got to the bottom of it yet, have another look in your ECU as it sounds like it has been chipped.
As an aside my 95 WRX Wagon was going to 1.25 bar and dropping back to around .6bar. I replaced the Dawes with a GBE and reset the waste gate tension so it now goes to 1.25 bar, dropping to 1 bar. Planning to mod the car and put on a TD05-06 20G, front mount, Link etc but it is going so well it seems a shame. Especially with last fuel consumption of 29.45mpg over 339.6 mls.

StickyMicky

i havnet got to the bottom yet, im working niteshifts this week so its not the best time to start messing about with cars when its dark outside

I did find the reason why the boost went so high in the first place, a pipe had blew off the dawse device.

regards checking a ecu to see if it has been chipped, if the ecu case is removed would there being sum sort of piggyback board or anything installed?

or would it be sumthing like, a removal of the chip and a new one solderd in place?
im not clued up when it comes to spotting non standerd chips, from memory there wasnt anykind of tuning sticker or anything on the chips (looked stock to me but that i havnet looked at that many)



[Edited by StickyMicky - 1/5/2004 5:09:23 PM]

StickyMicky

i will try and get a picture of the ecu opend up tomorow if theres enough light to work

greasemonkey

Could be a piggy-back chip in the ECU itself, could also be an external fuel cut defender/boost clamp. Before you get as far as taking the top off the ECU itself, have a good look for little gadgets spliced into the wiring loom, especially if the connections are sealed with tape, scotchblocks or some other non-OE looking method.

[Edited by greasemonkey - 1/5/2004 5:52:43 PM]

StickyMicky

if there was a fuel cut defender installed

wouldnt that remove the fuel cut compleatly?
or does it just move it further upwards?

greasemonkey

Most likely to simply be higher than it should be, but having said that, most are adjustable, and if you adjusted it high enough the net effect could be the same as complete removal.

harvey

iTrader: (48)

The FCD, depending on which one it is will allow you to run to somewhere between 1.25 and 1.5 bar but as already asked, has anything been spliced into your wiring loom, apart from the FCD and yes please send a non blurred photo of your ECU PCB. The most common way to raise performance is a simple boostlift.