Dash Pot question.

[busdriver]

I have been told on here that instead of a wastegate that I have a dash pot. What is a dash pot? And what does it do with the accumulated boost? I'm new to the turbo thing and am having some wierd symptoms with my turbo on my 87 GL10. There is a definate lag amidst mid spool on the turbo. It will power up, hit about 3500 r's and it feels like someone shut off the key. Keeping the gas pedal depressed, it sputters and then hits hard and takes off. Wierd. I'm thinking of having a turbo friendly friend over to help me swap out some vacuum lines and such...and he didn't understand the dash pot as well. Thank you for any help.

[Cougar]

It's a poteniometer, or variable resistor, that changes resistance value with the air pressure it is supposed to monitor.

[NorthWet]

Your 87 GL-10 has a wastegate unless someone removed it.

 

A dashpot is a diaphram in a housing that has a linkage rod, usually to the throttle linkage, and a metered orifice, usually vented to the atmosphere. Its purpose is to hold the throttle open for a specified period of time after you close the throttle. I have heard that the EA82ts use a dashpot to keep the throttle from being slammed shut during overrun so as to keep the turbo somewhat spooled. I have heard this in the context of instead of a blow-off valve (BOV) or recirculation valve we have a dashpot. (Not much of a substitute :-\ . )

 

So it may be that you heard that your 87 doesn't have a BOV but has a dashpot.

[TheSubaruJunkie]

Yeah, your car has both... a wastegate and a dashpot.

 

-Brian

[MilesFox]

maybe your hesitation is throttle position sensor related, as its common and also present in my buddy's rx motor in the gl-10 TRASHWAGON6. the tps is pretty much a fariable resistor with an idle switch and a WOT switch on eaither end of it

[NorthWet]

The hesitation could also have a less exotic cause, like sparkplugs/wires. Before digging in to the TPS or other sensors, make sure that your normal tune-up stuff is in order. My 87 t-wagon ran like a dog (fast, slow, nap, fast:grin: ) when its plugs and wires went bad on me.

 

Oddly enough they failed shortly after I put injector cleaner into the fuel tank. I figure something during the cleaning process (mixture leaning due to minor clogging or actually getting clean so they didn't run rich) overstressed the sparkplugs, and everything went downhill from there.