Dump Valve?

[sikersh]

Hi all,

Just wondered if anyone knew if this is a dump valve?



I'm planning on changing the dump valve on my Abarth 500 and this was the only thing I could find that looked like a DV...

Ta,

Simon

[roscozs]

Is that not a MAP sensor? Its hard to tell. Does it have a somewhere for the gasses to vent?

[sikersh]

roscozs said:

Is that not a MAP sensor? Its hard to tell. Does it have a somewhere for the gasses to vent?

Thats what I was thinking. It doesn't look as though it has anywhere for the gasses to vent...

[Marf]

sikersh said:

roscozs said:

Is that not a MAP sensor? Its hard to tell. Does it have a somewhere for the gasses to vent?

Thats what I was thinking. It doesn't look as though it has anywhere for the gasses to vent...

Two things:-

1. An OEM dump valve will generally dump back into the intake, it wont vent to atmosphere.

2. I've never seen a dump valve connected to the loom.

I don't think thats a dump valve.

[sikersh]

Marf said:

sikersh said:

roscozs said:

Is that not a MAP sensor? Its hard to tell. Does it have a somewhere for the gasses to vent?

Thats what I was thinking. It doesn't look as though it has anywhere for the gasses to vent...

Two things:-

1. An OEM dump valve will generally dump back into the intake, it wont vent to atmosphere.

2. I've never seen a dump valve connected to the loom.

I don't think thats a dump valve.

Thanks for that

[DaveL485]

A dump valve looks like this-


A recirculating one looks like this-


That is NOT a Dump valve.

[stevieturbo]

The pic is crap, but its neither a dump valve or a map sensor.


But the pic is crap. Without any other reference as to where it is, its impossible to tell.

[sikersh]

Cheers

Yep the pic is a bit crap, it was freezing/snowing so I just wanted to get a quick one.

I had a recirc on my old Punto GT, but the Abarth's engine bay is quite crammed, so quite hard to get around! I'll have another look for it tomorrow.

[sikersh]

Right, looked closely into this and the pic I posted IS the Dump Valve.

It can be heard/seen here in the bottom right with the BMC Filter: http://www.youtube.com/watch?v=ly8-zoq0mMg

[stevieturbo]

cant see anything at all in that video.

[TheEnd]

I can hear a stupid noise of accurately measured air being vented into the atmosphere resulting in overfuel conditions as the air vanishes from the ecu's point of view, but at least the sound of a kitten's sneeze and petrol fumes will turn a few heads on the highstreet.

[eliot]

TheEnd said:

I can hear a stupid noise of accurately measured air being vented into the atmosphere resulting in overfuel conditions as the air vanishes from the ecu's point of view, but at least the sound of a kitten's sneeze and petrol fumes will turn a few heads on the highstreet.

aye

[stevieturbo]

TheEnd said:

I can hear a stupid noise of accurately measured air being vented into the atmosphere resulting in overfuel conditions as the air vanishes from the ecu's point of view, but at least the sound of a kitten's sneeze and petrol fumes will turn a few heads on the highstreet.

DUH

Modern engines dump so much fuel in on the overrun, dont they ? Oh...when does a DV operate ? On the overrun. So it really doesnt matter what air goes through the MAF even if it doesnt sound a bit gay.

[sikersh]

TheEnd said:

I can hear a stupid noise of accurately measured air being vented into the atmosphere resulting in overfuel conditions as the air vanishes from the ecu's point of view, but at least the sound of a kitten's sneeze and petrol fumes will turn a few heads on the highstreet.

I was thinking more of a mouses sneeze! I don't want it stupidly loud anyway, don't want it to sound 'too' chavvy, just think it will add a bit more character to an already awesome car and also give a few extra horses

[TheEnd]

They also mess about with the air at idle, hence most DV manufacturers recommend recirc for MAF cars rather than atmospheric, and Forge made that Split-R one, a recirc that keeps the ecu happy but still makes the noise by venting a little outside.

[eliot]

sikersh said:

and also give a few extra horses

How many horses will the dump valve provide?

[TheEnd]

eliot's right, you won't gain power.
A decent DV on a big custom car might be needed to keep the turbo from stalling itself, and it'll keep spinning fast, and help with response, but your original system will have that under control anyway. You might get a touch more response, but not extra power.

Anyway, it's your car, and you are free to add sneezing mice if you wish.

Have you got any more pics of the engine and pipework? any other little black boxes which could be the DV?

[sikersh]

eliot said:

sikersh said:

and also give a few extra horses

How many horses will the dump valve provide?

Sorry, I meant from the OTA BMC Induction Kit as in the video above. The kit includes a 'pop-off' (thats how the Italians describe it! lol) filter, which is attached to the hose above the DV.

I've looked into it on the Fiat/Abarth forums and the pic I originally posted is the the DV. It's made by FPT (Fiat Powertrain) unlike my old Punto GT which was Bosch.

[stevieturbo]

TheEnd said:

They also mess about with the air at idle, hence most DV manufacturers recommend recirc for MAF cars rather than atmospheric, and Forge made that Split-R one, a recirc that keeps the ecu happy but still makes the noise by venting a little outside.

They only affect the idle if you install the wrong type or have it adjusted wrong.

[bales]

stevieturbo said:

TheEnd said:

They also mess about with the air at idle, hence most DV manufacturers recommend recirc for MAF cars rather than atmospheric, and Forge made that Split-R one, a recirc that keeps the ecu happy but still makes the noise by venting a little outside.

They only affect the idle if you install the wrong type or have it adjusted wrong.

Also it doesn't make any difference what type you use if your car is a speed/density type management, its only silly MAF type that get messed up with standard piston dump valves, but imo MAF type is crap for forced induction anyway.