All Things Mk5 > Mk5 General Area
Forge question
Boothy:
http://www.forgemotorsport.co.uk/content.asp?inc=product&cat=0006&product=FMFSITA
Could somebody who knows about Dump/Recirc valves have a look at this and tell me if thats the only bit I'd need or does it need something else as well? It reads like its part for a part if that makes sense?
:confused:
Boothy:
I forgot to ask this bit............
.......is it a REALLY bad thing to have the valve dump it atmospherically rather then recirculate it? It seems to be a bit of a mixed bag?
iainalpine:
Boothmeister, I remember from the days of tuning the impreza's that we used to get a sharp lean condition taking place with lift off after full boost being achieved (also known as overrun). this caused a very high flash heat in the engine and could cause engine fatigue.
I have tended to stay away from vent to atmosphere valves due to this.
Iain
Jaywoo-GTI:
I run a fixed type on mine without any problems at all, The only thin i find is it goes off a little to often with it bein controlled electronically. Does anyone have any experience with these after a remap?
Mark_GTIV:
--- Quote from: iainalpine on May 14, 2009, 09:45:20 am --- Boothmeister, I remember from the days of tuning the impreza's that we used to get a sharp lean condition taking place with lift off after full boost being achieved (also known as overrun). this caused a very high flash heat in the engine and could cause engine fatigue.
I have tended to stay away from vent to atmosphere valves due to this.
Iain
--- End quote ---
Hi there, surely it would be the other way around? You would get a temporary rich mixture condition because the car would have vented to atmosphere pre-metered air that wasn't returned to the intake, so the fuel load requested would be higher than it needed to be at the moment of gear change/lift off.
Any hoo... I run a Forge instead of the Bosch diaphragm unit without the atmospheric spacer and the 'yellow' spring on my GTI. I ran it on stage 1 software and now on stage 2 software and it works flawlessly. Certainly better than worrying about a split diaphragm all the time.
For a normal GTI 2.0 TFSI - this is all you need : http://www.forgemotorsport.co.uk/content.asp?inc=product&cat=260303&product=FMFSITV - it comes with everything (the valve, two springs, the actuator, the vacuum lines and clamps and the remote bracket.)
If you have an ED 30 - then this is the kit you need : http://www.forgemotorsport.co.uk/content.asp?inc=product&cat=260303&product=FMFSITVR
The part you have highlighted is to space your existing Bosch unit to vent it to atmosphere - and assuming you have a normal GTI 2.0 TFSI and that is what you want to do - then that is the correct part.
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