wastegate question

ok, thats what someone else told me but my car doesn't think the same thing. before i noticed it wasn't connected it would boost to 12-14 psi on the stock boost gauge.
is there something wrong with the flapper or the actuator if it builds that much boost without being connected?

stock gauge is not reliable at all, you might be able to spool 8-10 PSI with the flapper blowing open, if that much, you need to re-connect it. Shouldn't be too hard to do.

ok, it is reconnected already and now it averages 10psi(on the stock gauge). i'll find out what it's really at when i get my boost gauge in later this week.
thanks for the help guys

The stock gauge isn't actually a measurement of manifold pressure. It is just a guestimate by the ecu. For real the car was probably lucky to build 2 psi.

the butt dyno felt like a hell of a lot more then 2 psi

If the actuator arm is not connected to the flapper door, the flapper will remain open at all times. That will allow the exhaust gas to bypass the turbine wheel and create no boost. The only way to create boost is if and when it boost creeps. Other than that, you will be at 0 psi or in vac.

As stated above, the stock boost gauge is not accurate at all. Go ahead and reconnect that arm to the flapper and enjoy boosting.

there is no way the car wasn't boosting. it pulled way to hard to not be. i'm gonna do some experimenting with it connected and without, when i get a real boost gauge

boostinsidewayz said:

there is no way the car wasn't boosting. it pulled way to hard to not be. i'm gonna do some experimenting with it connected and without, when i get a real boost gauge

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Well, then it's creeping..... What RPM does boost feel like it's coming on? Around 4.5-5K?

Does the car have exhaust modifications (ei. 3" turboback)??

the rod is hooked back up now, so i'm not sure. but i think it was around that. what rpm should a stock car be a full boost(according to a stock gauge)? no mods, but it does have an exhaust leak at the flex pipe.

With the rod hooked up, you should be seeing (feeling) boost around 3K.

Sound like you were creeping before, but I don't know how you were doing that with a stock exhaust......

I am having the exact same situation with mine right not the rod was completely disconnected inside the actuator, I do have a "real" gauge and is is showing sub 14 Psi. I think with the manifold "arm" in the down position it is actually closed. When it is to the side it is open. I am basing this on a slightly lower rpm spped in the down position. I feel like I am getting a decent boost at 25-30 mph (pretty high up there though). But, it is a craptastic automatic. I did not look at my rpm to see when it spools real well. So where should it be kicking in?

99gst_racer said:

With the rod hooked up, you should be seeing (feeling) boost around 3K.

Sound like you were creeping before, but I don't know how you were doing that with a stock exhaust......

Click to expand...

my car rocks!
crap this means something is wrong doesn't it? great...

boostinsidewayz said:

my car rocks!
crap this means something is wrong doesn't it? great...

Click to expand...

Hook that rod back up and secure it so it can't become disconnected again. Then go and purchase a real boost gauge and see if you're creeping.