Andy, do you have the slow rev patch installed on your JTW setup?

 

I thought it was jut for keeping the idle smooth, but I think I have now experienced the problem it causes. ;)

 

Have you installed the patch or did you find another way round it?

Hiya m8!

 

I don't run it no, but then I don't have a MAS at all to worry about ;):D

 

Basically the problem is caused by the idle valve taking all its air from one side of the intake. Depending on which bank you mount the MAS on when you go twin pop, it will either measure double the idle air it should, or none of it at all...

 

An easier (IMO) way to sove this is to take a second air supply from the turbo outlet hose on the drivers side. If you look how the stock system is, you'll see it takes its feed from the passenger side outlet, just before it joins into the boost hose to go to the IC. If you duplicate this on the drivers side, then Tee it in to the idle supply (both banks now feed the idle valve) this should solve your problem :)

 

May not make much sense but its difficult to describe...