burbling1

iTrader: (1)

Hi. Just fitted td05 and z4 ecu to 94 wagon now its boosting to 15-18 psi and hitting fuel cut any ideas why.
Thanks

powerwrx

iTrader: (11)

you require a remap my friend

burbling1

iTrader: (1)

why? should the ecu not just let it run at standard boost

powerwrx

iTrader: (11)

if you have changed turbos,then i guess youve gone for a better one?, if so then your turbo will be generating more boost to start with, but your ecu will be set up for your origional turbo,therefore it will require remapping to allow for the changes you have made.

burbling1

iTrader: (1)

both the turbo and the ecu are off a 95 wrx saloon

powerwrx

iTrader: (11)

the saloon i think was a td04 where as the wagon was a td05 (i think) are you sure you have fitted a td05 if its come off a saloon

pre 96 uk wagons were fitted with td05
pre 96 import wagons were fitted with td04

burbling1

iTrader: (1)

wagon had td04 smaller one saloon had td05 thats why they have 260 bhp were as wagon only has 220

powerwrx

iTrader: (11)

well as ive stated,you have fitted a bigger turbo then therefore producing more boost which your ecu cant cope with ide say bud

not all wagons had the td04 i dont think

pre 96 uk wagons were fitted with td05
pre 96 import wagons were fitted with td04

burbling1

iTrader: (1)

[QUOTE=powerwrx;8017524]well as ive stated,you have fitted a bigger turbo then therefore producing more boost which your ecu cant cope with ide say bud

but the ecu is off a wrx which has a td05

GazJenno

lol... powerwrx, he has fitted the turbo and ecu from the saloon to the wagon so yes burbling1 it should work.

you may have put some of the vacuum pipes on wrong or removed the restrictor in the bottom pipe from the boost solenoid? Look also for split hoses and lose pipe... just starting with the basics.

you could adjust the actuator arm if its an adjustable which it is on some TD05s.

Gaz

burbling1

iTrader: (1)

thanks i will check over the pipes again. i have adjusted the actuator arm for now but feel as though thats just masking over the problem. were will i find the "restrictor" exactly

GazJenno

restrictor is found in the bottom pipe on the 3 port boost control solenoid which is over on the drivers side front suspension turret.... it looks like a small cylinder with three pipes coming from it. The bottom pipe is the one with the restrictor and this pipe connects into the black resonator box on the intake trackt (although it can vent to atmos if resonator box has been removed for the like of an induction kit) Ive never found it easy to tell if theres a restrictor in there but if its the standard pipe it should still be in there (as opposed to being changed for silicon hosing) but if you remove it you can blow through it and should be able to tell that its not letting it flow as much as should, therefore restricted

Decat exhaust and induction kit could cause the overboost when running the standard un-mapped/chipped ecu, although as fas as i know the Z4 is more accepting of thoes mods.

might of got more response if posted in the general technical section for future reference

Gaz

zedy

fit a fuel cut defencer for gaaawds sake, my97 does it at high revs on the motorway, i cant map it i need an apexi commander thingy but as mentioned before the fuel cut defencer will do

GazJenno

fuel cut is there to protect your engine from overboosting... too high boost can have a bad effect on your engine. too much air for the standard fuel system to cope with will make it run lean, too high boost for the turbo will give just hot air, high pressure is too much for standard interals to cope with ect... fuel cut defender is removing the saftey feature its there for a reason

your just avoiding the fact your setup is not correct if you just mask your problems this way.

Gaz

+Doc+

You might have air leaking somewhere, common thing to overboost if so.

burbling1

iTrader: (1)

Just had a look for restrictor. Not found it but did find that were the pipe goes into "resenator" box its a very poor fit would this give it more boost