Guest Usmann A Posted March 9, 2003 Share Posted March 9, 2003 As most of you know that they are many bov's to choose from,they are two main types ,the ATMOSPHERIC one and the RECIRCULATING one. I heard that on some cars the atmospheric one is not suitable as the boost pressure is lost and and so this fools the ECU or MAF.(as the engine has lost boost/air,) We have a HKS sqv on the supe and a recirculating one on the saab(which cannot have atmospheoc valve,as it fools the ecu), so which is better on the supra?(does the MAF/ECU get fooled or mislead on atmosph. valves on the supra?) Help appreciated! Usmann Ali Quote Link to comment Share on other sites More sharing options...
Adam W Posted March 9, 2003 Share Posted March 9, 2003 Theory says that a vent-to-atmosphere aftermarket valve could upset the air metering on the car. In practise, loads and loads of people have done it and I don't know of anyone who has had a problem. Quote Link to comment Share on other sites More sharing options...
Alex Posted March 9, 2003 Share Posted March 9, 2003 Originally posted by u_ali As most of you know that they are many bov's to choose from,they are two main types ,the ATMOSPHERIC one and the RECIRCULATING one. I heard that on some cars the atmospheric one is not suitable as the boost pressure is lost and and so this fools the ECU or MAF.(as the engine has lost boost/air,) We have a HKS sqv on the supe and a recirculating one on the saab(which cannot have atmospheoc valve,as it fools the ecu), so which is better on the supra?(does the MAF/ECU get fooled or mislead on atmosph. valves on the supra?) Help appreciated! Usmann Ali The J-spec is MAP not MAF so there is no issue with dumping to atmosphere. Quote Link to comment Share on other sites More sharing options...
Guest Usmann A Posted March 9, 2003 Share Posted March 9, 2003 Alex, what is the difference mechnically between the MAP &MAF that makes one suitable for atmosphere dumping then the other. Sorry for sounding dumb.....but cheers for the help! Quote Link to comment Share on other sites More sharing options...
Alex Posted March 9, 2003 Share Posted March 9, 2003 One measures air pressure and adjusts the fueling One measures air flow (mass) and adjusts the fueling by its readings. The MAF in the UK/US/Euro version is mounted in the Pre-turbo (or it might be post turbo?!) pipework. The MAP sensor is in the Intake manifold. The BOV AFAIK sits before the MAP sensor in the pipework. But it sits after the MAF. I think that's correct - I haven't looked at a UK spec in depth.... Quote Link to comment Share on other sites More sharing options...
GavinL Posted March 9, 2003 Share Posted March 9, 2003 Originally posted by Alex Holdroyd One measures air pressure and adjusts the fueling One measures air flow (mass) and adjusts the fueling by its readings. The MAF in the UK/US/Euro version is mounted in the Pre-turbo (or it might be post turbo?!) pipework. The MAP sensor is in the Intake manifold. The BOV AFAIK sits before the MAP sensor in the pipework. But it sits after the MAF. I think that's correct - I haven't looked at a UK spec in depth.... The MAF is just after the air filter and I think I am correct in saying has a MAP as well. Quote Link to comment Share on other sites More sharing options...
Guest Martin F Posted March 9, 2003 Share Posted March 9, 2003 Yep UK spec has MAP and MAF. Quote Link to comment Share on other sites More sharing options...
Guest Usmann A Posted March 10, 2003 Share Posted March 10, 2003 Cheers for the info guys,does that mean that uk spec cars have thier BOV mounted differently to the J-spec ones?(I think they have ,but not 100%)? Quote Link to comment Share on other sites More sharing options...
Alex Posted March 10, 2003 Share Posted March 10, 2003 Originally posted by u_ali Cheers for the info guys,does that mean that uk spec cars have thier BOV mounted differently to the J-spec ones?(I think they have ,but not 100%)? BOV is in the same place on both....its the MAF that can lead to different results from the j to uk spec cars. Bottom line. They are safe to use. The HKS SQV is IMO the best. Quote Link to comment Share on other sites More sharing options...
Guest Usmann A Posted March 10, 2003 Share Posted March 10, 2003 Thanks, Cheers alex! Quote Link to comment Share on other sites More sharing options...
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