Originally Posted by Dave07997S

Stacy I would say you will be in the 360rwhp range with full boost. Not much better than what I originally estimated. Also what you have going against you is that the 911 is such a hard car to dyno, especially with a blower. Intake temps are probably going through the roof because of the air being forced into the intake along with lack of cooling from the dyno itself.

Does this shop know how to properly dyno a 911 with fans for each front radiator and a huge fan in the rear?

Are you going back after the leak is fixed?

BTW, if the right input is going into the gtech meter they aren't that far off...don't ever use the mph they give you on the 1/4mile run, they can be off by as much as 5mph to the positive.

Dave

Originally Posted by 1999Porsche911

How did you hook up you bypass valve vacuum control? Very common mistake. Make sure it is off vacuum at WOT. Leakage of 2 psi+ for any other reason should be easliy audible when at WOT.

Originally Posted by justatoy

Yeah they know,
I was in touch with VF prior to dyno and they said to put a fan in the front radiators as well as one over the rear of the motor.
So you think that 2.2PSI will only net another 32 RWHP?!

I am thinking it should be more.
We will see....

Stacy

PS Now to find the boost leak!

Originally Posted by justatoy

I woke up this morning and was thinking EXACTLY that!
I was thinking it is one hell of a big leak!
I am just going through the instructions and double checking.
It is hard for someone who does not do this(installing superchargers) for a living to comprehand how much of a leak this is until you talk to VF or someone knowledgable like yourself.

Could it be a bad bypass valve?!
If so how do I test it?
What about the check valve that is part of the throttle-body vacuum adapter????




Anyway,
Knowing that..... I am NOW on the hunt,LOL!!!
Thanks again for your help 1999Porsche911,

Stacy

Originally Posted by 1999Porsche911

Unlikely the valve is bad, but the installation might be. Post a picture of the valve and connections. It may be something obvious.

Originally Posted by justatoy

Here is a pic...sorry for the bad pic.
The throttle body adapter to a T-fitting.One part of the tee goes to bypass valve and the other part goes down to the top of the motor and this one has a check valve(underneath the throttle body).

I removed the bypass vacuum line and could push air through...both in and out!

Shouldn't the check valve go between the t-fitting and the bypass valve?

Originally Posted by 1999Porsche911

Hard to see the lines. Do you have a check valve on any of them? If you want to determine quickly if its the vacuum lines, disconnect the line to the bypass valve, plug vacuum line and go out and let her rip. You'll know if the valve was open.

You can test the valve too. Without vacuum, the should be no flow.

Originally Posted by justatoy

Here is the same pic only I circled the check valve

Originally Posted by justatoy

Ok guys,

I bought a vacuum/boost gauge today!
At idle 20 in. of vacuum.....at approx at 7200 rpm,I am making 3.8 psi of boost.All this and NO audible boost leak or at least to my ears.
Even though I am not sure of the sound of leaking boost but I was told I would be able to tell.
My pulley size on the supercharger is 3.8 inches.

Could the bypass valve spring be releasing too soon(bad spring)?

My next step is to take it to the shop that did the dyno and do the "smoke" test!
I guess they smoke the intake system,add pressure and then look for small amounts of smoke escaping(leak) using an ultraviolet light.
I am positive it is going to be something simple/stupid....

Stacy