flux Posted October 8, 2006 Posted October 8, 2006 Hi,I've just got a 95 (quad lamp) GT Turbo running completely standard bar a turbo timer and i was considering adding a BOV.I was just wondering if there is any technical reason for doing this as the factory fit re-circulator BOV protects the turbo and my last car had a Greddy re-circulator which i was advised to keep for performance reasons.So what i'm basically trying to ask in a roundabout kinda way is :Will an atmospheric dump valve / BOV reduce performance?Will it protect the turbo as well as the factory fitted one?Does it upset the Mass airflow sensor with the air pressure going up and down so quickly ( i read somewhere it can cause over-fuelling and petrol can be dumped into the exhaust).thanks!
flux Posted October 9, 2006 Author Posted October 9, 2006 PS..What do people think of just opening up the stock BOV so it vents into the air?
NDR008 Posted October 9, 2006 Posted October 9, 2006 ok, so in theory an atmospheric BOV (in my technical opinion, have no real evidance) should reduce performance JUST A TINY probably negligable bit.An atmospheric dump valve will propetct your turbo, and engine.And for setting the stock BOV to vent to the atmosphere, it sounds quite cool (when you think about it being vost free), I did it, try it out, got nothing to lose.
Spuddy Posted October 9, 2006 Posted October 9, 2006 I am just using the stock one opened to vent into the atmosphere, sounds good and quite loud.
flux Posted October 9, 2006 Author Posted October 9, 2006 I am just using the stock one opened to vent into the atmosphere, sounds good and quite loud.What did you use to block off the re-circulator pipe?
klyfax Posted October 9, 2006 Posted October 9, 2006 Hi,I've just got a 95 (quad lamp) GT Turbo running completely standard bar a turbo timer and i was considering adding a BOV.I was just wondering if there is any technical reason for doing this as the factory fit re-circulator BOV protects the turbo and my last car had a Greddy re-circulator which i was advised to keep for performance reasons.So what i'm basically trying to ask in a roundabout kinda way is :Will an atmospheric dump valve / BOV reduce performance? No, if your air filter is not standard (A open filter).Will it protect the turbo as well as the factory fitted one? Yes.Does it upset the Mass airflow sensor with the air pressure going up and down so quickly ( i read somewhere it can cause over-fuelling and petrol can be dumped into the exhaust). If the car where with Mass Airflow sensor, then yes. But the car is with a MAP sensor so, No it does not upset.thanks!
flux Posted October 16, 2006 Author Posted October 16, 2006 Hi,sorry to ask again, but.. whats the best thing to block the recirculator pipe off with?I've take in into a couple of garages to ask if they have anything and one said "try and get something off ebay" and the other side "you will need to get something machined"...Is there a cap you can just buy?thanks again.
scutch0 Posted October 16, 2006 Posted October 16, 2006 lma do boost pipe bungs.contact them on +44 (01234) 268213
flux Posted October 18, 2006 Author Posted October 18, 2006 Excellent, thanks. I dont suppose you know what size the GT is or will i have to take it in bits and measure the hole?Gave them a phone this morning and they werent sure.cheers.
flux Posted October 25, 2006 Author Posted October 25, 2006 IMA only do 20 and 25mm unfortunately. I don't suppose anyone else has any ideas?thanks
Toby@ToyTuning.com Posted October 25, 2006 Posted October 25, 2006 If you want a quick fix a 50p is a direct fit as well as a 2p piece if your on a budget. CheersT
flux Posted October 27, 2006 Author Posted October 27, 2006 If you want a quick fix a 50p is a direct fit as well as a 2p piece if your on a budget. CheersTI did consider this. A 2p with some silicon sealer?It would ne nice to have something a bit neater though.
flux Posted October 28, 2006 Author Posted October 28, 2006 well thats a 2p with some rubber solution fitted.Seems ok. Its quite a soft sound you get off it , especially on normal gear changes.Maybe consider putting a hose on it so it vents outside the bonnet.. anyone done this?
flux Posted October 29, 2006 Author Posted October 29, 2006 I've been running around on it for a day now and i've just put it back to recirc.It definitely is less responsive venting out so the recirc must be doing some good.Possibly a proper atmospheric BOV with a harder spring would work better......
Recommended Posts