Tuning dump valve part 2!

Currently reading:
Tuning dump valve part 2!

smoo

New member
Joined
Jul 22, 2005
Messages
93
Points
33
Location
Salford Quays (Manchester)
have had a chat to one of the guys at L & M regarding what is the best dump valve for a 20VT, he says that the best is a recirculating one as opposed to a atmospheric one as the later brings muck in to the engine through the intake? Is the views from you guys the same as the views from L & M??

Thanks

Chris:confused:
 
I think that realistically there's no difference. However, the MAF sensor measures the amount of air entering the system, and sets various ignition properties based on that. If you are dumping some of that already measured air on each gearchange, then for a brief moment, the calculations will be wrong. So I prefer a recirculating dump valve on the Coupe. That and the fact it's more subtle. I have a Bailey DV30, which seems OK.
H
 
what noise is the dump valve supposed to make?? just fitted a baileys to my coop, and it makes more of a spinning noise than a wooshing noise?? is it a faulty one???
 
smoo said:
have had a chat to one of the guys at L & M regarding what is the best dump valve for a 20VT, he says that the best is a recirculating one as opposed to a atmospheric one as the later brings muck in to the engine through the intake? Is the views from you guys the same as the views from L & M??

Thanks

Chris:confused:

Under vacuum a non recirculating dump valve will be open, so it will draw unfiltered air in.

If the dump valve is after the mass air flow meter, this will cause you bother.
 
Not heard that one. I've heard that K+N intakes can block the air sensor as the filtering oil is drawn in over time. If you like the whap-tisch, get a atmos, if you are a little more conservative, go for the recirc. Apparently the atmos DV causes the coupe to overfuel for a fraction of a second on the overrun as the engine is expecting the dumped air back into the system. If you run a de-cat this can mean flames every gearchange :cool:
 
dont know what sort it is, but after taking the fiat dump valve from the engine, i have had to block of one of the pipes with a bit of a broom stick, which i am assured is the right thing to do?? you can hear it, fairly well, when changing gear, and when you ease off the accelerator, but its a spinning sound, not a single woosh, sounds the nuts though!!!
 
Back
Top