Welcome Guest [Log In] [Register]
Welcome to the Dorset Japanese Old Crew. We hope you enjoy your visit.


You're currently viewing our forum as a guest. This means you are limited to certain areas of the board and there are some features you can't use. If you join our community, you'll be able to access member-only sections, and use many member-only features such as customizing your profile, sending personal messages, and voting in polls. Registration is simple, fast, and completely free.


Join our community!

If you had membership on the Original DJCC Forum then that account should still be active on this forum and you can log in below using your old username & password.

If you're already a member please log in to your account to access all of our features:

Username:   Password:
Add Reply
Hitting Fuel Cut
Topic Started: Jul 15 2008, 11:04 PM (354 Views)
LJ
Unregistered

scoobs just started playing up again <_< started hitting the fuel cut in 3rd gear boosts fine in 1st and 2nd at 1.1bar but then seems to hit 1.2-3 in third, any ideas whats causing it? :dunno: thinking if getting a dawes device to manualy limit the boost, will that work?
Quote Post Goto Top
 
LegacyTurbo
No Avatar
y0
[ *  *  *  *  * ]
sounds like boost creep, a dawes device will probs give you the same problems TBH, you can limit the boost if you restrict the vent pipe on the bottom of the boost solenoid somewhat, i did it on the leggy with an old bleed valve. basically stops the solenoid bleeding as much boost which will in effect lower boost pressure
[GK-customfield]Lewis[customfield-GK]
Starlet GT 1.3 forged engine, tdo4 turbo @ 1.25bar = 252bhp = SOLD :(

EDIT: Charade GTxx 993cc three cylinder turbo, 173bhp @ 1.4bar (should hit 200bhp with a larger throttle body, removing stupid high lift cams and a bit more boost)
Offline Profile Quote Post Goto Top
 
ScoobaJon
No Avatar
J
[ *  *  *  *  * ]
The higher the gear, the more boost the turbo will produce. If you set the EBC to your desired pressure in 5th it should never go above that in any of the lower gears.

HTH
Offline Profile Quote Post Goto Top
 
RA Jay
No Avatar
4 Have Gone But Never Forgotten.
[ *  *  *  *  * ]
^^^^^what he says....A Dawes is the cheapest and easiest way of solving the problem.
1995 WRX - 318bhp/300ftlb - SOLD - 2005
2001 WRX Bugeye - 235bhp/230ftlb - SOLD - 2007
1996 WRX Type RA - 282bhp/285ftlb - SOLD - 2008
1997 STI Type RA - 350bhp/320ftlb - SOLD - 2009
1991 Nissan Pulsar GTiR - 286bhp/280ftlb - SOLD - 2009

Offline Profile Quote Post Goto Top
 
LJ
Unregistered

is EBC electronic boost controller? if so i cant use the one i have due to the chip from Scott as on its lowest setting it hits 1.4bar so i will go for a dawes device and hopefully should fix the problem :thumbsup:
Quote Post Goto Top
 
jimbobs22
No Avatar
Here to stay
[ *  *  *  * ]
or an fcd {fuel cut defencer} my mates got one on his scoob and is running 1.5 bar boost and can adjust it to runn more pressure
Offline Profile Quote Post Goto Top
 
LJ
Unregistered

i shouldnt think it'l last long doing that! :blink:
Quote Post Goto Top
 
LegacyTurbo
No Avatar
y0
[ *  *  *  *  * ]
jimbobs22
Jul 16 2008, 04:48 PM
or an fcd {fuel cut defencer} my mates got one on his scoob and is running 1.5 bar boost and can adjust it to runn more pressure

BAD TIMES!!!!! :blink:
[GK-customfield]Lewis[customfield-GK]
Starlet GT 1.3 forged engine, tdo4 turbo @ 1.25bar = 252bhp = SOLD :(

EDIT: Charade GTxx 993cc three cylinder turbo, 173bhp @ 1.4bar (should hit 200bhp with a larger throttle body, removing stupid high lift cams and a bit more boost)
Offline Profile Quote Post Goto Top
 
LegacyTurbo
No Avatar
y0
[ *  *  *  *  * ]
dawes device is crap though, as you will never be running the correct amount of boost in lower gears.

If you want to sort it correctly get an uprated actuator (I have a Forge one and its great quality) and get a good EBC.
[GK-customfield]Lewis[customfield-GK]
Starlet GT 1.3 forged engine, tdo4 turbo @ 1.25bar = 252bhp = SOLD :(

EDIT: Charade GTxx 993cc three cylinder turbo, 173bhp @ 1.4bar (should hit 200bhp with a larger throttle body, removing stupid high lift cams and a bit more boost)
Offline Profile Quote Post Goto Top
 
RA Jay
No Avatar
4 Have Gone But Never Forgotten.
[ *  *  *  *  * ]
jimbobs22
Jul 16 2008, 05:48 PM
or an fcd {fuel cut defencer} my mates got one on his scoob and is running 1.5 bar boost and can adjust it to runn more pressure

1.5bar.. :o how is he suppling the fuel to back that up?
1995 WRX - 318bhp/300ftlb - SOLD - 2005
2001 WRX Bugeye - 235bhp/230ftlb - SOLD - 2007
1996 WRX Type RA - 282bhp/285ftlb - SOLD - 2008
1997 STI Type RA - 350bhp/320ftlb - SOLD - 2009
1991 Nissan Pulsar GTiR - 286bhp/280ftlb - SOLD - 2009

Offline Profile Quote Post Goto Top
 
RA Jay
No Avatar
4 Have Gone But Never Forgotten.
[ *  *  *  *  * ]
Nothing wrong with a Dawes Device there isnt a better MBC on the market...ive had two on two different scoobs the first one took my scoob from 282bhp to 313bhp best £65 ive ever spent. It will hold boost better than standard boost control and brings it in slightly earlier.
1995 WRX - 318bhp/300ftlb - SOLD - 2005
2001 WRX Bugeye - 235bhp/230ftlb - SOLD - 2007
1996 WRX Type RA - 282bhp/285ftlb - SOLD - 2008
1997 STI Type RA - 350bhp/320ftlb - SOLD - 2009
1991 Nissan Pulsar GTiR - 286bhp/280ftlb - SOLD - 2009

Offline Profile Quote Post Goto Top
 
LJ
Unregistered

well ive got one coming tomorrow so will be a good test :D
Quote Post Goto Top
 
LegacyTurbo
No Avatar
y0
[ *  *  *  *  * ]
RA Jay
Jul 16 2008, 06:37 PM
Nothing wrong with a Dawes Device there isnt a better MBC on the market...ive had two on two different scoobs the first one took my scoob from 282bhp to 313bhp best £65 ive ever spent. It will hold boost better than standard boost control and brings it in slightly earlier.

they dont hold, admittedly they bring the boost in quicker, but they tend to spike under full throttle then drop off a touch... then in higher gears they creep.

IMO if your upping the boost on a car you should bin the stock actuator as they dont help the problem, the standard actuator spring is something like 7ish PSI which is so weak

i bet if you had tested your actuator pressure on your old wrx it would have been down to something like 4psi lol.
[GK-customfield]Lewis[customfield-GK]
Starlet GT 1.3 forged engine, tdo4 turbo @ 1.25bar = 252bhp = SOLD :(

EDIT: Charade GTxx 993cc three cylinder turbo, 173bhp @ 1.4bar (should hit 200bhp with a larger throttle body, removing stupid high lift cams and a bit more boost)
Offline Profile Quote Post Goto Top
 
RA Jay
No Avatar
4 Have Gone But Never Forgotten.
[ *  *  *  *  * ]
You right Lewis the "crack" pressure of the TD05 turbo is roughly 7psi.....The Dawes is not a bleed valve where the boost signal is always acting on the wastegate as the boost builds which in turn the wastegate is allowing gases to bypass the turbine whilst spooling up.

The Dawes on the other hand will hold the signal from the wastegate until it reaches the level thats been set.

Lets agree to disagree.... :P

anyway im in Weymouth tomorrow ill bring that CAT with me if you want to get Scott to pick it up...He should have my number, ill be in Grosvenor Road by Tescos Extra.
1995 WRX - 318bhp/300ftlb - SOLD - 2005
2001 WRX Bugeye - 235bhp/230ftlb - SOLD - 2007
1996 WRX Type RA - 282bhp/285ftlb - SOLD - 2008
1997 STI Type RA - 350bhp/320ftlb - SOLD - 2009
1991 Nissan Pulsar GTiR - 286bhp/280ftlb - SOLD - 2009

Offline Profile Quote Post Goto Top
 
LegacyTurbo
No Avatar
y0
[ *  *  *  *  * ]
ok i'll call him now cheers :P

I know what a dawes is lol. Its just a ball and spring valve.
[GK-customfield]Lewis[customfield-GK]
Starlet GT 1.3 forged engine, tdo4 turbo @ 1.25bar = 252bhp = SOLD :(

EDIT: Charade GTxx 993cc three cylinder turbo, 173bhp @ 1.4bar (should hit 200bhp with a larger throttle body, removing stupid high lift cams and a bit more boost)
Offline Profile Quote Post Goto Top
 
rob73
No Avatar
hello
[ *  *  *  *  * ]
could it be a split in one of the boost pipes as mine was over boosting once upon a time and thats what it was...a teeny weeny split in the crappy silicon boost pipe i had on. Although it did pop and misfire as well but just a thought Luke.
1995 wrx wagon the cleanest around!!!
Offline Profile Quote Post Goto Top
 
LJ
Unregistered

dont think so, just had fmic fitted today and still doing it, gona fit dawes device tomorrow which should enable me to restrict it below the fuel cut ;)
Quote Post Goto Top
 
LegacyTurbo
No Avatar
y0
[ *  *  *  *  * ]
bet it feels faster now luke??? hows it sound? did bob fit it wonky?? lol :lol:
[GK-customfield]Lewis[customfield-GK]
Starlet GT 1.3 forged engine, tdo4 turbo @ 1.25bar = 252bhp = SOLD :(

EDIT: Charade GTxx 993cc three cylinder turbo, 173bhp @ 1.4bar (should hit 200bhp with a larger throttle body, removing stupid high lift cams and a bit more boost)
Offline Profile Quote Post Goto Top
 
rob73
No Avatar
hello
[ *  *  *  *  * ]
still dont cure the problem tho luke just gonna bypass it by fitting a dawes,from the experiences ive had with boost playing up it was the pipes every time i went back to the original subaru boost pipes as they are specific items and dont swell under boost or draw in under vacumn. you fit fmic yourself?
1995 wrx wagon the cleanest around!!!
Offline Profile Quote Post Goto Top
 
LJ
Unregistered

LegacyTurbo
Jul 17 2008, 11:04 PM
bet it feels faster now luke??? hows it sound? did bob fit it wonky?? lol :lol:

cant really tell due to hitting fuel cut atm, sound is lush! think il be leavin th DV off for a while :lol: and no its not wonky, they let Bob lose on the cutting of me bumper but he made a pretty good job of it tbh even though it looks like someone with parkinsons did it :lol: :P

















only kiddin Bob, good job :thumbsup:
Quote Post Goto Top
 
LegacyTurbo
No Avatar
y0
[ *  *  *  *  * ]
LOL! bloody fuel cut!!! dont hit it too much you'll knacker your piston ring lands!!! :(
[GK-customfield]Lewis[customfield-GK]
Starlet GT 1.3 forged engine, tdo4 turbo @ 1.25bar = 252bhp = SOLD :(

EDIT: Charade GTxx 993cc three cylinder turbo, 173bhp @ 1.4bar (should hit 200bhp with a larger throttle body, removing stupid high lift cams and a bit more boost)
Offline Profile Quote Post Goto Top
 
LJ
Unregistered

yea, is it 1.2 bar when it hits the fuel cut?
Quote Post Goto Top
 
LegacyTurbo
No Avatar
y0
[ *  *  *  *  * ]
not sure mate, i know my fuel cut is raised to 20psi on my leggy, but that has an australian VOS chip as its a legacy. i've never hit it since i binned the stock boost control
[GK-customfield]Lewis[customfield-GK]
Starlet GT 1.3 forged engine, tdo4 turbo @ 1.25bar = 252bhp = SOLD :(

EDIT: Charade GTxx 993cc three cylinder turbo, 173bhp @ 1.4bar (should hit 200bhp with a larger throttle body, removing stupid high lift cams and a bit more boost)
Offline Profile Quote Post Goto Top
 
LJ
Unregistered

fitted my dawes device today and have now sorted the over boosting problem :yay: :rock: gona get it on the rollers now :drive:
Quote Post Goto Top
 
LegacyTurbo
No Avatar
y0
[ *  *  *  *  * ]
tried ragging it flat out in 5th?
[GK-customfield]Lewis[customfield-GK]
Starlet GT 1.3 forged engine, tdo4 turbo @ 1.25bar = 252bhp = SOLD :(

EDIT: Charade GTxx 993cc three cylinder turbo, 173bhp @ 1.4bar (should hit 200bhp with a larger throttle body, removing stupid high lift cams and a bit more boost)
Offline Profile Quote Post Goto Top
 
1 user reading this topic (1 Guest and 0 Anonymous)
Go to Next Page
« Previous Topic · Subaru: Technical Questions & Info · Next Topic »
Add Reply

Free Domain Name Registration