bypassing hi and low boost

scott_glanzav

scott_glanzav

Member +
bypassing the high and low boost solinoid. was just woundering is this definetly safe as iam just after getting a full rebuild there and it wasnt cheap lol and the mechanic takes a very dim few on bypassing it he said its giving the car an uncontroled amount of boost and could reck the turbo charger or even the engine ?
 
97'GlanzaVTurbo

97'GlanzaVTurbo

Member +
Well I have it done to mine and seems fine. The way I see it is the car is made to take 10PSI of boost as standard, the only thing bypassing the solenoid does is allow it to boost full on 1st and 2nd with slight imporvements through all gears. So I think it would be fine but each car is different :p
Christy
 
gv1.3

gv1.3

Admin
scott_glanzav said:
bypassing the high and low boost solinoid. was just woundering is this definetly safe as iam just after getting a full rebuild there and it wasnt cheap lol and the mechanic takes a very dim few on bypassing it he said its giving the car an uncontroled amount of boost and could reck the turbo charger or even the engine ?
Click to expand...

hes talking shite. It can only boost to whatever the actuator will allow it boost to.
 
gv1.3

gv1.3

Admin
or you could get boost spikes if you have breathing mods etc and the boost turned up. You havent mentioned any other modifications carried out so I am assuming you are stock...

You should probably elaborate if you are not stock.
 
MJA

MJA

Member +
having an FCD and RRFPR on standard boost is completely pointless anyway! standard boost is .45 low and .65 high. The FCD removes fuel cut which is triggered at .85
 
A

Adam_Glanza

Member +
no wonder you blew the last engine up then!

if you spiking past fuel cut and have a fcd its just gonna take away the fuel cut.

so your probably running very lean and thats why your blowing up your engines!

get that fpr on straight away before you think about anything else.
 
ChrisGT

ChrisGT

Member +
Same engine (pretty much) in a GT, and that has no boost restrictions in 1st and 2nd, and they come like that from factory. So I'd assume a V would be fine with it bypassed.
 
Jay

Jay

Admin
It's important to get your fuelling checked after adding modifications. A bad choice could damage your engine.

I would blame FCD's as the cause of many blown pistons through the years.
 
NDR008

NDR008

Fresh Recruit
So many points where raised here.

a) EP91: 1st and 2nd gear are boost limited to Lo. EP82: Did not have this enforced limit.

b) Removing the Hi/Lo switch does absolutely no damage to the car (and similarly, leaving it there makes no difference either). Find a new mechanic. (He talks nonesense and is dumb if he told you to fit the FCD). There have been a few reports that without the Hi/Lo solenoid, the boost went up by 1psi. Don't know how true, and it is not a really big different either.

c) FCDs are an ECU/Engine's worse enemy. FCDs are used by people that want to run higer boost, but this really mucks up the way the engine works.
The ECU relies on the boost reading to know what fuel to put in. The FCD tricks the ECU into thinking their is less boost (so that it does not cut out). As a consequence, the ECU is constantly tricked and throws in less fuel then that is really needed. Some tuners, to make up for the lack of fuel, add an adjustable fuel pressure regulator. This itself is also bad, because it is a very crude way of adding more fuel, and in time you will damage the injectors, because the injectors are still operated at the wrong duty cycle, more fuel is made to pass through them due to the higher pressure.

If you want more boost, get a proper piggy back or standalone.
 
G

gorganl2000

Lifer
NDR008 said:
have been a few reports that without the Hi/Lo solenoid, the boost went up by 1psi. Don't know how true, and it is not a really big different either.

FCDs are an ECU/Engine's worse enemy. ---i can agree here to some extent,,,,although i would not run one...the jam/greddy/etc units which operate as clamps are not that bad as the other types which affect the whole range........and i beleive,,,and anyone can correct me on this,,,,but i think the greddy ultimate, etc operate ad clamp type fcds when u run boost above 1 bar (i think u have to set them at 4.1 or 4.2 volts)


If you want more boost, get a proper piggy back or standalone.----correct,,,saves a lot of trouble in the long run
Click to expand...

i once tried it for a day...and i only experienced 1 psi increase in boost level, which with the oem actuator quickly went back to lower llevels in the higher rpms
 
97'GlanzaVTurbo

97'GlanzaVTurbo

Member +
I bypassed my boost solenoid and there is far more pull off the car now. The car boosts at least 10PSI throughout all gears now:p
However I dont know if it was bypassing the solenoid that caused this problem but its the only thing I changed on the car. After a week of having it bypassed the car is now making a whistlin noise when driving, it sounds like really bad spool up, so I wouldnt recomend it to be honest but it could be something else that caused my problem, I wont know til I get the car checked out.
Christy
 
A

Adam_Glanza

Member +
its one of the easiest / best mods to do to a standard ep91 i would say.

makes a big difference and it wont damage the car at all!
 
Jay

Jay

Admin
Adam_Glanza said:
its one of the easiest / best mods to do to a standard ep91 i would say.

makes a big difference and it wont damage the car at all!
Click to expand...


Agree with the first point.

However some Glanza's will hit fuelcut with only the solenoid bypassed. If this happens the engine is at risk of piston/ringland damage.
 
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