please will someone explain dump valves , and why they are of NO advantage to an escort rst , and why some cars do run better with them ??

inc reciculating ones

thanks

 

i think its just a personal choice on a erst, but it does cause a few running problems on a mfi rst

if i had efi, there wouldnt be any dumpvalve on my car, chatter all the way!

 

This is what i read about dumpvalves-----
Although a dump valve in itself will not increase power it reduces the effects of turbo lag between gears. When the turbo has fully spun up and is pushing its maximum boost to the engine when the throttle is closed during a gear change the turbo will start to push against a dead end. This causes the turbo impeller to loose revs and spin down. When the next gear is selected and the throttle again opened the turbo will need to spin up to its boost pressure again. By fitting a dump valve the turbo can keep spinning since the valve is releasing the built up pressure to atmosphere. This hence reduces the lag of the turbocharger and allows the power in the next gear to come in much quicker. Note: During very severe driving and higher boost pressure the dead end effect of a closed throttle can cause the turbo impeller to shatter due to the high pressure it creates.
So i would think they help in someway.

 

All the above as antony215, says.

However it is just a personal choice. and unless your running a car with 40+psi of boost, there aint much chance of the impeller shattering.

Dump valves are also supposed to prolong the life of a turbo. But again unless your running a lot of boost, dont make much difference.

At the end of the day most people fit them cus they want the phist sound.

 

MadMac,
At the end of the day most people fit them cus they want the phist sound.

Thats what i think just there to get you noticed half the time

 

thats the one.

However I'd rather convert my car to EFI and have chatter

 

MadMac,

 

also it puts extra pressure on the bearing inside the turbo,a standard bearing only operates on 180 degree of the face,this is why hybrid turbo's have a 360 degree thrust bearing to cope with the back pressure!