Which dump valve for LET
Does anyone know the reason why piston-type dump valves are needed on the LET?
Something about the type of air mass meter used or whatever.
But what I donīt understand is why a piston-type dumpvalve would be better, considering itīs usually atmospheric as well. For that whooosh sound you all know
A diaphragm based dumpvalve is quite cheap and I just got one very very cheaply. So can I use it?
The 'old' type dump valves just opened when there as manifold vacume.
So the valve was open on idle and lets air in, so this sends an AMM car tits up. The AMM doesn't register air going in and so doesn't fuel correctly.
The dual piston bailey ones etc only open when the turbo -> throttle pressure is greater than atmospheric and there is manifold vacume as far as i know. This stops them 'leaking' on idle.
I can tell it would be unwise to bolt in my el-cheapo dump valve?
Good thing it was so cheap I can probably sell it off without problems, then.
You can try it...
But it proberbly likely that it will cause stalling when dipping the clutch at junctions etc.