Hi all for sometime now i have had boost problems ive recently fitted a boost gauge to c exactly how much it was.

In 1st and 2nd gear it seems to be fine then into 3rd it boosts upto 1.5 bar then drops almost straight away back to 1 bar then it will start to pick back up a little.

Alot of members on here say to check the pipework so i was wondering as i have no idea about these cars if any1 had pics they could post on here to show me exactly what i am looking for.Any help would be great with the pipework and if they r ok then i will buy a n75 valve as that is the only other thing i have not done yet everything else is new to alot of expense thanks again.

Hi all for sometime now i have had boost problems ive recently fitted a boost gauge to c exactly how much it was.

In 1st and 2nd gear it seems to be fine then into 3rd it boosts upto 1.5 bar then drops almost straight away back to 1 bar then it will start to pick back up a little.

Alot of members on here say to check the pipework so i was wondering as i have no idea about these cars if any1 had pics they could post on here to show me exactly what i am looking for.Any help would be great with the pipework and if they r ok then i will buy a n75 valve as that is the only other thing i have not done yet everything else is new to alot of expense thanks again.

PM Rob Clubley He Knows EVERYTHING about M ones ,you might catch him before he goes to bed,New Zealand

Hopefully someones got some engine bay pictures they can post up with arrows but I'll try to explain the main places you need to check:

1. Check all the small diameter hoses going into and out of the N75 valve, this is the little blocky thing in the large pipe between the airbox and the turbo, you'll need to remove the engine cover to see it properly as the back right hand corner of the engine cover covers it up.

2. Check the hose from the metal turbo boost pipe at the back of the engine to the divertor/dump valve is not split and is secured tightly both ends.

3. Check the Y shaped pipe under the engine cover toward the top left front of the engine, and the stiffer plastic pipe underneath it

4. There are also two pipes nearby that are held together with black tape, take the tape off and see if it's hiding any splits and replace the tape

5. Unscrew the metal plate in front of the intake manifold and slide it off (be careful not to damage the dipstick), look under the manifold and check the pipes under there for any splits or leaks

6. Jack car up and remove drivers side roadwheel. Check the large diameter boost hoses from the turbo to the metal pipe in the wheel arch and the hose from the metal pipe to the bottom of the intercooler (which is behind the arch liner)

7. finally check the large diameter hose from the top of the intercooler to the throttle (behind the drivers side headlight)

Is your car fitted with a KO3s turbo and std OEM smic ????

1.5 bar boost from a KO3s will create very high AIT's..... too much for an smic to deal with when the summer ambient temp is high.

Bill.

Is your car fitted with a KO3s turbo and std OEM smic ????

1.5 bar boost from a KO3s will create very high AIT's..... too much for an smic to deal with when the summer ambient temp is high.

Bill.

Hi bill i really have no idea all i know is that the car has been remapped other than that i have no idea sorry.

Hi bill i really have no idea all i know is that the car has been remapped other than that i have no idea sorry.

Hi briso

If you dont know of any upgrades then chances are the turbo and IC are indeed std.

The fact that your car boosts to 1.5 bar in the first place goes some way towards indicating that the boost pipes, smic, TB and inlet maniflold are leak free.

A faulty DV or N75 valve could easily cause the symptoms you describe, as could running the car on poor quality/grade fuel.

But as I already said over boosting to 1.5 bar peak, with a KO3s and a std smic when ambient air temps are high, can also cause boost problems due to AIT's getting too high.

Bill.

Hi briso

If you dont know of any upgrades then chances are the turbo and IC are indeed std.

The fact that your car boosts to 1.5 bar in the first place goes some way towards indicating that the boost pipes, smic, TB and inlet maniflold are leak free.

A faulty DV or N75 valve could easily cause the symptoms you describe, as could running the car on poor quality/grade fuel.

But as I already said over boosting to 1.5 bar peak, with a KO3s and a std smic when ambient air temps are high, can also cause boost problems due to AIT's getting too high.

Bill.

Thankyou bill sorry to sound so stupid on the subject but i really do not have any idea on the car i have replaced the plugs coil packs m.a.f dump valve fuel filter pancake pipe and cleaned throttle body temperature sensor so i guess i will now try the m.a.f thanks again for your reply.

chances are you still have the standard side mounted intercooler, unless you can see a ruddy great big metal radiator like thing in front of the actual radiator

Hi Briso

The Side mount intercooler (SMIC) is the standard one that sits behind the front bumper grill on the drivers side. Looks like this when bumper removed

Front mount intercooler (FMIC) will be mounted in front of the radiator. something like this one. Which is really needed when running high boost to keep temps down.

PM Rob Clubley He Knows EVERYTHING about M ones ,you might catch him before he goes to bed,New Zealand

I don't know much

Hi Briso

The Side mount intercooler (SMIC) is the standard one that sits behind the front bumper grill on the drivers side. Looks like this when bumper removed

Front mount intercooler (FMIC) will be mounted in front of the radiator. something like this one. Which is really needed when running high boost to keep temps down.

Thanks alot for the pics will be taking it apart to look for splits tomorrow .

i thought that a ko3s will peak at 10/11 psi and settle at 8 psi standard?  my stage 1 peaks at 18 psi settles at 15/16 psi i live with this as i thought it was what ko3s did?

I don't know much http://ww1.briskoda.net/forums/public/style_emoticons/#EMO_DIR#/emoticon-0100-smile.gif

But I know I love you!!!!!!!!

C'mon we all know that song...... This ain't a bromance thing people:)

But I know I love you!!!!!!!!

 

Hmmmm, I'll take the cue....

 

That may be all WE need to know...

3 year old thread lol