I think my dashpot has failed, i am going to test it, to see for sure though.
My question is if it can be removed without any real consequence. I know I would momentarily run rich on decel, but is that all
?

 

I have not had a dashpot on my car for several months because it was broken and I plan to replace it. I think the dashpot is mostly for emissions and is suppose to reduce back-firing during shifts which my car has stopped doing anyway.

I still plan on replacing mine since I don't see anyway to repair it, yet.

 

when you rev the car up and let off the pedal fast it will stall with no dash pot unless you raise the idle.

 

wats a dash pot

 

x2

 

The dashpot is a small mechanical delay that bolts to the throttle body. It's designed to prevent the throttle plates from snapping closed in the last few degrees of their travel. Makes the engine a lot harder to stall if you go from a high throttle setting to zero throttle.

Fundamentally it's not going to hurt the car if you remove it, but with the stock ECU you may have stalling problems if you let the throttle snap closed.

 

wow i need a picture cause my car does that and im sure the previous owner removed it

 

it is real easy to find. Move your throtte in and out and look on the back side of the throttle body. There is going to be a little white button sticking out of a metal device that screws into a bracket and is held in its set position by a nut. The white button should have a good deal of resistance on it so that it can slow the speed at which the throttle closes for the last little bit. The S4 and S5 dashpots look slightly different but I do not know if they are interchangeable. Mine was shot and the button pretty much just stays in all the time and has no resistance if you pull it out and push it in. They wither have some sort of pressurised gas or fluid in them and mine must have leaked out.

 

http://www.1300cc.com/howto/how2/dashpot.htm

 

I've been running without one for a few years with the stock ECU, and I've never had stalling problems. At least the way I drive, whenever I'm letting off the gas all the way to shift, I'm above 1500 RPM, so I'm hitting the closed throttle fuel cut anyway.

-=Russ=-

 

I disassembled my dash pot by bending the metal on the back side up with a pair of small vice-grips. I was able to analyze the parts and determine that the dashpot operates with pressurized air, 2 rubber diaphragms, a spring, and a cast zinc housing with a one way valve and a small return port hole in it.

The dashpot's components are all still in good shape and it seems that the outer metal house which is clamped around the components was not able to hold the seal.

So far I have siliconed the front diaphragm to the zinc body and I plan to expand the diaphragms as much as possible, put the parts in the freezer, and then siicone the rear diaphragm to the zinc housing. The purpose of the freezer is so I will have a higher air pressure in the dashpot once it comes to room temperature.

I do not know what kind of pressure should be in the dashpot so I am just guessing at this. There is a small ball in the side of the dashpot that was used originally to seal the port where the compressed gas was originally inserted then sealed off. The dashpot also needs to operate at a range of pressures go below freezing to hot engine on a hot summer day temperature. It is also possible a special gas was used but again I do not know this and air will work fine.

 

the dash pot helps your car not jerk when you get off the gas in gear and when you get back on the gas in gear.

 

I assembled the dashpot last night and it feels more like a spring in both directions rather than a one way resistance dashpot. I need to install it and see how it works. I think the rubber oneway valve may not be sealing well. It is hard to tell these things when I don't have an operational one to compare it to.

 

Im pretty sure a good tps and good drivetrain mounts help that.

 

The dash pot does not contain air rather it contains some type of liquid. Air is too compressible and the throttle pretty much slammed shut. I assumed it was air based on the size of the holes but it definetely is not. I am not sure what type of liquid to use. Water is OK but is going to be one of the fastest flowing it could also near boiling and would definetely freeze in the winter. Using a coolant or an oil would be better but may damage the rubber diaphragm.

Is there anybody or anywhere I could get some technical assistance on this?

 

Check the third gen section faq.. i remember there being a thread on dashpot replacement and repair. i might be wrong.

C

 

think of the dashpot as the thingie you put on a door to keep it from slamming closed--it will close quickly and then it will slow down for the last couple inches to keep it from slamming shut

 

https://www.rx7club.com/showthread.p...hlight=dashpot

I found this thread. It has a bit of experience to share but not much detail or insight. I disassemble my dashpot so I have the advantage of acquiring a better seal. The rubber diapragms are sealed by the crimping of the metal and I think this is where the leaking came from. Mine was bone dry when I took it apart.