michael harbour
Member +
anybody any ideas . when i gun my 96 glanza it starts to spluter and hold back and it puts engine management light on??????
glanza
- Thread starter michael harbour
- Start date
michael harbour
Member +
you got a link to it mate?
Aidan@EP-styling
Trader
michael harbour
Member +
aye think just below a bar. it has got decat, hks actuator, front mounted intercooler. full exhaust, hks filter. any body any ideas???????
michael harbour
Member +
what is a rrfpr??
Spoonz
Member +
ok mate.
A fuel cut removes the factory restriction of boosting above 0.9bar if u get one you can boost to anything u want (not a good idea but u get the point) the problem with this is the fcd has been known to lean the fueling out so you can do serious damage to a piston or ring
A rrfpr (Rising Rate Fuel Pressure Regulator) Raises the fuel goin into the engine on acceleration so giving a rich top end mixture BUT you will run rich all throw the rev range hence why some people say its a crude way of doing it but has been proven very sucessful in the past and now.
you can also use bigger injectors to stop the lean mixture but the best cure for the problem is to buy a piggy back ecu or standalone and get it mapped
NOTE: Im not advising you to do this has i dont know your full mods ie a mianifold which you dont list the standard one is restricted and is known to cause damage so with out a full spec list i can't reall say what to do.
BEST THING TO DO IS TURN DOWN THE HKS ACTUTOR TO RESOLVE THE PROBLEM
A fuel cut removes the factory restriction of boosting above 0.9bar if u get one you can boost to anything u want (not a good idea but u get the point) the problem with this is the fcd has been known to lean the fueling out so you can do serious damage to a piston or ring
A rrfpr (Rising Rate Fuel Pressure Regulator) Raises the fuel goin into the engine on acceleration so giving a rich top end mixture BUT you will run rich all throw the rev range hence why some people say its a crude way of doing it but has been proven very sucessful in the past and now.
you can also use bigger injectors to stop the lean mixture but the best cure for the problem is to buy a piggy back ecu or standalone and get it mapped
NOTE: Im not advising you to do this has i dont know your full mods ie a mianifold which you dont list the standard one is restricted and is known to cause damage so with out a full spec list i can't reall say what to do.
BEST THING TO DO IS TURN DOWN THE HKS ACTUTOR TO RESOLVE THE PROBLEM
TurboDave
Member +
Edit: Beaten to it .
Right, As standard the starlets air intake system and exhaust are very restrictive. When you remove the cat and fit a decat some restriction is removed and even more of the restriction is removed when you fit a better flowing exhaust as you have.
When you remove the standard air box and fit an open filter again more restriction is removed.
All of this restriction being lost will leave the engine take in air easier and throw it out of the cylinders through the exhaust easier. This also means that it will cause your turbo to produce more boost than standard due to the less restrictive setup. This extra boost is now triggering a pre-set safe limit which, is programmed into the ECU and is called fuel cut or boost cut. When you create more than roughly 0.85bar the ecu will cut the fuel going to the engine and cause your spluttering.
The remedy is to fit a FCD which wires into the ECU and fools the ECU into thinking it is getting less boost than it realy is and thus eliminated the boost cut. There is still a problem though because if you simply fit a FCD the extra boost you are running over fuel cut say 1 bar will not be fueled for by the ECU and you could end up running lean and get fried pistons. This is why you need a RRFPR (rising rate fuel pressure regulator) preferably a full Sard kit which costs roughly £135. The RRFPR is adjustable so you can set the base fuel pressure higher than the standard 2.3 bar of pressure. Not only do you get an increased base pressure but the regulator is connected to the inlet manifold with some vacuum piping and when your car creates boost some boost pressure travels down the pipe and increases the fuel pressure further as the boost increases and provides the extra now needed fuel.
To sum up;
If it is fuel cut you are experiencing (more information needed on exactly what happens when the light comes on and it splutters) you need to buy a FCD and a RRFPR and then run 1 bar of boost, or adjust the actuator down and hope that it cures your problem but this may not stop the fuel cut because you may be experiencing boost creep which is common after fitting a free flowing exhaust and decat.
Hope this helps
Dave
.Right, As standard the starlets air intake system and exhaust are very restrictive. When you remove the cat and fit a decat some restriction is removed and even more of the restriction is removed when you fit a better flowing exhaust as you have.
When you remove the standard air box and fit an open filter again more restriction is removed.
All of this restriction being lost will leave the engine take in air easier and throw it out of the cylinders through the exhaust easier. This also means that it will cause your turbo to produce more boost than standard due to the less restrictive setup. This extra boost is now triggering a pre-set safe limit which, is programmed into the ECU and is called fuel cut or boost cut. When you create more than roughly 0.85bar the ecu will cut the fuel going to the engine and cause your spluttering.
The remedy is to fit a FCD which wires into the ECU and fools the ECU into thinking it is getting less boost than it realy is and thus eliminated the boost cut. There is still a problem though because if you simply fit a FCD the extra boost you are running over fuel cut say 1 bar will not be fueled for by the ECU and you could end up running lean and get fried pistons. This is why you need a RRFPR (rising rate fuel pressure regulator) preferably a full Sard kit which costs roughly £135. The RRFPR is adjustable so you can set the base fuel pressure higher than the standard 2.3 bar of pressure. Not only do you get an increased base pressure but the regulator is connected to the inlet manifold with some vacuum piping and when your car creates boost some boost pressure travels down the pipe and increases the fuel pressure further as the boost increases and provides the extra now needed fuel.
To sum up;
If it is fuel cut you are experiencing (more information needed on exactly what happens when the light comes on and it splutters) you need to buy a FCD and a RRFPR and then run 1 bar of boost, or adjust the actuator down and hope that it cures your problem but this may not stop the fuel cut because you may be experiencing boost creep which is common after fitting a free flowing exhaust and decat.
Hope this helps
Dave
Last edited:
michael harbour
Member +
its a standard cat with cuts took out. aye got fpr and fcd and zep de cat today still to fit do you think these will cure the prob?? it has also has 1st and 2nd derestricted..
michael harbour
Member +
cheers aye will let use no how aye get on ..