Recirc Valve Placement Efficiency 2.0 Turbo

[lemmingzappa 75 1 Cars]

I was wondering what would be more efficient when fitting an aftermarket recirculating/diverter valve:

 

I believe the above is how the original XU10J2TE (non-XM) recirc is set up.

 

Does this 2nd option look better or worse? The air will be cooled at this point after it's travelled through the intercooler, so could be of better quality before it goes back into the turbo?

[Tom Fenton 1,542]

Dump valve should go as close to the throttle plate as possible, this stops the air you are wanting to get rid of having to change direction (think about it)

 

Not sure why you want to fit an aftermarket valve, the OE Bosch plastic one works fine and is cheap. Paul Higgs 250bhp car uses one.

[jackherer 543]

IIRC the XM turbo engine doesn't have a DV from the factory. I had a nasty aftermarket vent to atmosphere valve on your engine when I had it and I'm sure I just took off a blanking bung when I fitted it.

[lemmingzappa 75 1 Cars]

Yes you're right about the XM's not running one, I believe some of the SRi's ran the plastic type.

 

I'm using a 406 boost pipe which has a take off for a recirc but I will be bunging that one up and using a 25mm take off which is part of the Sierra Cossie intercooler. I've decided on the 710N VAG part as they are stronger than the Bosch type.

[wicked 103 3 Cars]

The XU10J2TE uses a MAP sensor an no MAF sensor, so there is no need to recirculate the air, other than reducing noise.

It might be easier to use an open type dump valve? I kind of like the sound of my open Bailey dump valve...

[lemmingzappa 75 1 Cars]

The XU10J2TE uses a MAP sensor an no MAF sensor, so there is no need to recirculate the air, other than reducing noise.

It might be easier to use an open type dump valve? I kind of like the sound of my open Bailey dump valve...

 

The reason I'm using a recirc is because I don't like the sound of most dumpvalves, I want to minimise stress on the turbo (minimal I know) and it will help reduce spool times as the pressure won't be backing up against the turbo.

[lemmingzappa 75 1 Cars]

Can anyone tell me if I am OK to take a boost source from here:

 

 

If I remember correctly the T25 doesn't have an output on the turbo housing itself so wanted to get it as close as possible using an outlet I have on the boost pipe.

Will it be ok pre-intercooler, pre-recirc valve and pre-throttle, but not directly from the turbo?