overboost issue

[scooby doo]

Guys, having this slight over boost issue.
Can see its going up to 1.3bar
and hit fuel cut twice now so not spanking it around,
car is the old 94 wrx.
MODS
running stock 3 port.
3 inch Grd System,
Td05
pump,
Green Cotton panel filter
Arc I/C
stock air box, stock dump valve.
with the z4 car hits 1bar then tails back to .9 but in 5th under load will creep up.
now on chipped uk map car is meant to boost to 1.1 but hiting 1.3bar and fuel cutting

any ideas what can i do. really want the stock 3port to work, any suggestions please

[Scott.T]

Is the restrictor pill still in the bottom hose of the 3 port or has it had samco hoses fitted and the restrictor thrown in the bin.
The other normal one is no hose at all on the bottom port when sn induction kit is fitted.

[scooby doo]

pill still there, and venting to atmosphere, could it be the decats

[Scott.T]

What chip is it.
Does it overboost all the time.
What does it do if put your foot to the floor in 4th from around 3, 000 rpm and just let it pull through the revs.

[EXEVO3]

Originally Posted by SilverSurfer

What chip is it.
Does it overboost all the time.
What does it do if put your foot to the floor in 4th from around 3, 000 rpm and just let it pull through the revs.

sorry to hijack...just reading with interest...the bottom hose on my 3 port has been cut short...does nothing?? what would this do or not do???

[scooby doo]

Scott,
Took the car out of town this afternoon, loaded it up in 4th, from 3k foot to the floor.
The boost went up as normal up to 1.3bar then tailed of to 1.2, still to high.
As Fuel cut is 1.3. it drove fine, no coughs,fuel cut or misfire during that test.
it is over boosting every time to this 1.2/3bar but only hitting fuel cut in higher gears not 1st/2nd .

Chip is a major sarcism one, (so i was told of the owner)

[scooby doo]

EXEVO3

Here's a diagram to explain, the hose can sit there doing nothing as long as the pill is still inside, or your using a different way to control your boost example a greedy profic b or Avcr etc?
http://i59.photobucket.com/albums/g2...st_Control.jpg

[Scott.T]

Originally Posted by scooby doo

pill still there, and venting to atmosphere, could it be the decats

I can't really speak for the Major Sarcasm chip, but they have sold a few and the guy 'Dave' from the Isle Of Wight, that supplies Major Sarcasm (which is just a scoobynet users name) him does know his stuff.

The boost control on the Pre96 cars is quite good and robust and from the sounds of it is more a boost spike issue then a target issue.
It may have too much boost duty but it may be that your actuator is slightly too tight.

The restrictor pill is there to prevent boost spikes, and if it's still there then that's not the problem.
I would check the actuator pre-tension as a previous owner may of put a few extra turns on it to get it to hold a little more boost.

[Scott.T]

Fuel cut is not set to 1.3, but can be anywhere between 1.2 and 1.3
The MAP sensor at the top of it's range is quite un-linear therefore the fuel-cut level is not very reliable and can vary from car to car.

Hence why I only mapped to 1.11bar (max)

[EXEVO3]

Originally Posted by scooby doo

EXEVO3

Here's a diagram to explain, the hose can sit there doing nothing as long as the pill is still inside, or your using a different way to control your boost example a greedy profic b or Avcr etc?
http://i59.photobucket.com/albums/g2...st_Control.jpg

oh ok...so if i take that pipe off and look inside the pill as you call it should be in the pipe?? i want to check this as the spec of your car is what i will be doing...

[scooby doo]

Scott i tighten the actuator to show half the pin when resting above, this was to cure a lazyness i was having, this cured it, but could be the reason of over boost, so do you think i should wind it open a turn and try again??

[scooby doo]

Originally Posted by EXEVO3

oh ok...so if i take that pipe off and look inside the pill as you call it should be in the pipe?? i want to check this as the spec of your car is what i will be doing...

yes you should see or feel it in the pipe, if your getting the right boost the pill is most likely in there as with out this you will get crazy boost

[Scott.T]

Originally Posted by scooby doo

Scott i tighten the actuator to show half the pin when resting above, this was to cure a lazyness i was having, this cured it, but could be the reason of over boost, so do you think i should wind it open a turn and try again??

could be worth a try

[scooby doo]

Will try again tomorrow and report back

[scooby doo]

Wound out actuator two turns, bang on 1.1bar

[EXEVO3]

glad you sorted it mate.

[Scott.T]

Originally Posted by scooby doo

Wound out actuator two turns, bang on 1.1bar

Good news its sorted