My new toy...

Originally Posted by ssmith87

A whole new perspective on what i heard and was under the impression of

Ahhhhhh, see my thoughts where

Pressure is stored up by the dump valve meaning that the air couldnt escape and was then released in one go instead of a steady flow, yet that says it helps the turbo, hmmmm

From what i remember from messing with cars years ago, originally the dump valve was installed to a, get rid of pressure b, it helps keep the compressor spinning instead of on/off,on/off due to pressure release.
So that doesnt put as much strain on the bearings etc.
Early turbo's on mainstream cars were generally unreliable, bearings were not upto the job.
Please feel free to correct me if im wrong

Originally Posted by specialone

From what i remember from messing with cars years ago, originally the dump valve was installed to a, get rid of pressure b, it helps keep the compressor spinning instead of on/off,on/off due to pressure release.
So that doesnt put as much strain on the bearings etc.
Early turbo's on mainstream cars were generally unreliable, bearings were not upto the job.
Please feel free to correct me if im wrong

Yeah spot on, fitting a dump valve prevents comp stall and reduces turb o lag too.

I had read about changing the stock recirc valve to allow it to discharge to atmosphere but i didn't want to risk knacking it in anyway, i am awaiting delivery on a forge one should be here in a day or 2 then im going to drive round where i live making loads of noise like a moron till the novelty wears off

mick

[yorkie_chris]

Originally Posted by ssmith87

I just copied that from another site.

The gt4 st205's all have dump valve's fitted as standard but instead of venting into atmosphere ( ssssccchhh noise ) vent into the airbox which goes back through the intake ( recirc dump valve ) but you can unbolt it fromn the airbox and cover the hole left, and its amazingly loud. It is a sound of much pimpness

Also, feeding hot air back into the airbox is never good, because the compression is not ideal the temperature does not drop down to original level.
Not sure how much of an effect it has in practice, but it could cause detonation.