PowerDyne - Vacuum & Air Charge Temp Sensor ???

[BigCaney]

Seems like forever ago I started putting the Powerdyne setup on my '91 SHO Plus. Well I am getting close to being done, but I am unclear about a couple of things.

Vacuum lines, do I need to plug them, install check valves or leave them as they are??? Especially the crankcase vent tube that runs from the front valve cover to the throttle body.

Air Charge Sensors that use to be mounted in the air filter box. Where should it be moved to, for the best performance and reliability.

I hope to avoid that dreaded "check engine light" if possible.

Thanks for any help. :thankyou:

 

[yamahaSHO]

The crank case vent on the top of the block (under TB) and the vent on the valve cover should be disconnected from the TB completely. You could put a check valve in, but if they fail (happens fairly often), you'll blow out seals (I've blown a rear main out before). Plug/cap both ports on the TB.

You may want to put a check valve in the line going to the charcoal canistor. Without it, you'll get a fuel smell after getting into boost and it won't clear up until you've had enough vacuum to clear it out. Disconnecting it will also give you a fuel smell. I've currently been looking at these:

http://www.034motorsport.com/hardwa...-vac-hose-check-valve-18-*******-p-20443.html

http://www.urotuning.com/shop/vacuum-check-valve-a4passat-18t-p-2489.html

I run without a check valve in the brake booster since you're generally not on the brakes when you're in boost (especially with a supercharger - no brake boosting). I have read, on other cars, where people have put check valves in the BB and they failed in the closed position giving them no vacuum assist. I just looked at my STi as I have it apart and I could not locate a separate valve, however, one could be built into the BB.

The temp sensor can be installed in your charge pipe, or really just out in the engine bay. I've been running mine in the engine bay since boosting mine, but this winter I am going to weld a nut in the charge pipe to install it for accurate readings.

 

[Sho Amo]

He pretty much summed it up. Post some pics!

 

[BigCaney]

WOW, I forgot about the big crankcase/block vent that attaches under the throttle body. I sure don't want to blow any seals out.

THANKS

 

[BigCaney]

When I disconnect both of the Crankcase Vent Tubes, that will completely shut down the Crankcase Venting system. Will that cause any problems with the internals of the engine? I guess I will need to buy a couple of those small crankcase vent filters.

- Mike

 

[turbosho]

You will want to make or purchase a catch can, they have several styles depending on how you want to set it up. typically you put a filter on one crankcase hose and run the other to the catch can. from the catch can you go to a vacuum source such as a pump, a venturi in the intake pre supercharger, or into the exhaust.

you can get away with just running both to a filter, but it will blow oil (piston rings will have some blowby) and your engine will make more horsepower without the windage of oil mist.