Over boosting... need advice!!

[Jono FD3]

Guys, my wench has developed an addiction to boost!!!
Most of you know the work I have done to the car (my project bits!!) well on the way back from RS4 I ran with the boost controler turned off which set the boost back to stock 0.7 bar (this was solid for the 250 mile jurney home!), but for some strainge reason yesterday it waved it\'s middle finger at me and started to boost to 1.04 - 1.09 bar:eek: still with the controler off!!

What you recon has gone peeps?? what you recon I should look at first???

Cheers
Jono

[Hayward North]

Turn the boost controler back on ?
If you have an open exhorst and induction the fd has a tendency to spike or creap, this is kept in check with a boost controler or a remap by carl

[chrno]

Colder weather?

[Jono FD3]

Boost controller on & set to minimum on low setting it was hitting 1.09 bar!!!
It seams to work correctly when it wants to!!!

J

[Hayward North]

Boost controller on & set to minimum on low setting it was hitting 1.09 bar!!!
It seams to work correctly when it wants to!!!

J

Sounds like its not set up correctly.
You prolly need to look up the instructions online and get it to start limiting boost or it may be bad for the motor.
What setup are you running, including motor, turbos, fueling, ecu, and controlers (ie. boost controler).
Also are you sure your boost gauge is correct, can you feel the extra boost.

When mine was spiking to 1.2 it was like all hell broke loose compaired to 10psi.

The above info will help people diagnose whats wrong.

[Jono FD3]

You worked on mine at RS4 mate!! Mine was the only rotor to have a cr@p compression result !!

The thing is, when I first set up the controller, it was peaking at 0.85 bar all the time.... then the next time I drove it it was hitting fuel cut at 1.09 bar... searched for a loose pipe, found one & fixed it & boost was back to .86, then the next time I turned the key it was back to fuel cut!! turned the controller off & it was a solid 0.7, and yet again next time I drove it... you guessed it = fuel cut at 1.04bar!!!!!!!!!!!!

The car has std fueling, power fc, full exhaust (turbos back) air pump removal, secondry throttle removed, monster V mount, induction kit, ProfecB boost controler (occasionaly) set up as per website.

Jono

[Hayward North]

Think your compresion results could have been better, will pm you about them.
Do you think your ProfecB boost controler is set up correctly.
Nice car btw

[m4drx]

pipes on front of turbo pack from the top of each actuator, check those as they contain boost pills. otherwise check all of your check vavles (thats probaby why there are called check valves :rollin ) if all ok check for vacuum leaks all around plenul and LIM and rats nest.

good luck mate & let me know if you need any help,
tharek

[Jono FD3]

Got no pills there on mine fella.... never have?? it\'s just anoying as it\'s so random!!! think I\'m going to check the wastgate to see if it\'s stuck or something stupid!!!

Cheers for the offer Tharek
J

[Bobfish]

If you have no pills then theyve been left out or you have 99 spec turbos.

Check all of the wastegate lines. If there are any leaks this can cause a problem.  Could be a hairline crack or similar explaining why it works when it wants to (e.g when car heats up crack lets more air out and problem is worsened)

have you had your rats nest re-done?

[Hayward North]

Am i correct in thinking You dont need pills when you have a boost controler .
When i installed My Apexi Avcr it did away with them.
My avcr acts like pils it limits the vac in those lines.

[88GT-R]

The boost controller can not limit boost. Check what your air temps are when the boost creeps. It may be as simple as you are having a nice case of over efficiency and boost creep.

John

[Hayward North]

The boost controller can not limit boost. Check what your air temps are when the boost creeps. It may be as simple as you are having a nice case of over efficiency and boost creep.

John

I hear so manny people echo this.
No disrespect but, Please exsplain as i find it hard to belive as i have been told otherwise by somebody who is renound for his knowledge in these matters, he even advised me to get one, and even talked me through its importaces in rotary applications.

No attitude intended here just learning curve.

[Jono FD3]

Inlet temps very seldom cross 25c (27 was max traveling back from RS4 on the suny sunday!) so the engine is getting a very dence charge!! but how is it it works OK sometimes??? could it be a sticky wastgate??

J

[m4drx]

more likely to be what is controlling things such as wastegate than the item istelf mate