Boost problems?

[Pyro]

Did you look through the link I posted?

 

[rk696]

Did you put the N75 J valve in the right way round? They go the opposite way to the standard F version. It would make sense, as when it's the wrong way round, the ECU tries to close the wastegate with the n75, but because the n75 is backwards, it opens it instead, causing the turbo to cut its own boost.

However, that would normally make the turbo produce limp mode pressure which is around 600 mBar (9 PSI) iirc.

 

[Pyro]

6.6 psi well 6-8 normaly from the logs im 99.9% sure hes got the N75 the right way round unless there logs before he changed it

 

[rk696]

lol, nearly right.

He had the new valve when I logged it. It's strange how the boost is so consistent and doesn't vary with RPM. The turbo did sound really quiet when he gave it the beans, compared to my octy.

 

[Pyro]

could be silenced Ko3's and not on the octy

 

[rk696]

He has a K04. I didn't think they were silenced.

 

[Pyro]

lol there not i thought it was LC alan has a Ko4 that is alot quieter then my Ko3s you cant here his with the road noise

 

[JONNYVT]

Gonna have a boost leak check and fit a gauge. Which pipe does the t-piece sender attach to?

 

[LEE69]

The FPR gauge on the fuel rail.

 

[JONNYVT]

sorry to be thick but not sure what the PFR is! I wanna fit a boost gauge (not sure which type) an need to know to which pipe i should insert the t -piece. cheers

 

[JONNYVT]

The N75 J was installed in exactly the same position / orientation as the F valve i took out! is that wrong. Just did a few runs with the revo re-map turned off, the car is definately quicker with the map on so must be getting mre boost lower down the rev range. the new J valve def makes the turbo pick up faster but that could be downt he old one being knackered.

 

[LEE69]

sorry to be thick but not sure what the PFR is! I wanna fit a boost gauge (not sure which type) an need to know to which pipe i should insert the t -piece. cheers

 

[JONNYVT]

Many thanks, do u have an electonic or a mechanical gauge, which is best?

 

[LEE69]

I like mechanical simple hose to conect although my liquid gauge reads it from the obd port.