Manual Boost Controller Setup question
 

Hi all,

Running a manual boost controller and wanted to know the setup people are running for the line to the controller. Do you drill and tap the turbo housing with a NPT fitting or is your source from the upper manifold??

Mixed reviews out there on which way is "best". Wanted to know your thoughts.

Cheers

Are you on twins or single?

IMHO the best place is to use the nipple on the compressor housing. That gives the highest boost amount. If you pull from the upper intake manifold you don't get as much boost pressure to work with due to the pressure drop across the IC, piping, etc.

Dale

Thanks Dale. Appreciate it. I will have to drill and tap the compressor housing and use that.

Cheers

If you can get to it with a drill in the car you can do it in the car. Just stuff a rag down into the compressor while drilling and you can use wheel bearing grease on the tap to get 99% of the shavings.

To be clear for others, the more boost you can give the boost controller the sooner the waste gate opens and the lower your start point of boost will be. You can never go lower than that point. So, if you, for example, have a line from the compressor nipple to the waste gate with no boost controller, go drive, and you get 7psi of boost, that's your minimum boost. If that same example was on the upper intake manifold you may get 8 or 10 psi instead. Some setups also need to start bleeding off pressure as soon as you can to get a steady boost, if you have it going to the intake manifold you could be a bit "late" on your boost control which can mean spikes or going past what boost you want to hit.

It's also weird to think this but if you measure boost at the reference nipple it's typically a few psi higher than the intake manifold. You lose some boost pressure due to pressure drop. It's not unusual to see 1-3psi of pressure drop. For a boost controller you want the most pressure possible to work with, boost controllers can bleed pressure off (that's how they do it) but they can't add pressure so you want to start with as much input as you can, you can always lower it.

Dale

I should be able to do it in the car. Thanks for the tips Dale, appreciated as always.

Thanks for the additional info as well.

Cheers