Had to replumb N75 valve as the car would not make the boost we wanted, it now holds 1.6 bar and what a difference, has anyone else re-plumbed the N75, we now have boost ref going into the back of the valve (the port that normally goes to the diverters) and the front port open to air.

 

do you have a pic?
Also, with all your mods, why don't you use an EBC?

 

I will take a pic when I get back from London later, heres what the mapper sent me when we could not make required boost

Have a little play with what you've got - I think it's the pierburg valve blowing open that's causing the boost issue.

If you want to re-plumb your valve then I'll need to change a couple of things in the tune, I'm happy to send you a few files to try if you feel that you're able to load them confidently enough? Try them one at a time and see which one doesn't boost cut, then let me TeamViewer to look at logs etc and we can then look at winding some proper boost into it!

Using the photo attached as a reference - your car should currently have:

Common port [top]: Wastegates
Normally Open Port [metal]: Inlet manifold

If you want to re-plumb it then change to:

Common port [top]: Wastegates
Normally Closed Port [end/plastic]: Inlet manifold

The car WILL boost cut unless the .cal gets changed though


I dont run an EBC because the Syvecs controls that, I have 10 diff maps with various boost/TC settings I can also have gear dependant boost.

 

Interesting. In theory, that will work as effectively you have reversed the duty cycle. The tune would have to be changed to support it as now the base map would be reversed. Just to check, your not running external wastegates?

Your only issue is if you have a problem with the solenoid. If something happens your boost won't be controlled. Sounds like your running syvcs so it may be able to handle this case.

THIS won't work on a stock ecu, stock internal wastegate.

 

Interesting have never seen this done lQQk answered some of my questions lol.

 

Ebc is great but not for everyone... most have issues withe the vacuum lines to and from it... and some n75s do fail...

 

Im still on internal wastegates and we did need to change the tune to keep the boost where we wanted it, the Syvecs is set for trips on many things inc over boost so too much boost it will go into limp mode. Car pulls real hard now even with timing pulled to be gentle on the rods.

 

 

It sounds like you should find a mechanic.

 

Doubt he'll respond in an almost 5-year old thread.

 

Are these posts from bots?

 

yes, post count gives it away