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Message: <blockquote data-quote="EFN" data-source="post: 645671" data-attributes="member: 1416">There is two way to tune A-FPR, First, simply adjust it while the vacuum hose is connected at idle - you will be tuning the start point. Secondly, which is much more accurate is to disconnect the vacuum hose first, you will be tuning Full Throttle setup, which is generally higher than the Idle start point.Standard WAJA uses 43.5 PSI at Idle with Vacuum hose connected - this means that Full throttle pressure is at around 53 - 54PSI. The majority of my WAJA http://zerotohundred.com/newforums/showthread.php?t=6332 A-FPR customers run 47 to 50PSI at Idle and Full Throttle at 57 to 60PSI - and most of them are running Stock Standard setup with minor mods - and the results are good, very good in fact. But some WAJA does run very well with lower pressure, even as low as 32PSI Idle/42PSI WOT - I don't know how to explain this but I suspect that it has to do a lot with engine condition and driving style.So when you say that your mech tune to 43PSI with the vacuum hose disconnected, he is actually tuning WOT at 43PSI, so when the Vacuum hose is reconnected the Idle pressure would be at around 33PSI in fact - way too low for heavily modified WAJA like yours.* On the other hand, Any Fuel Injected cars can always benefit from A-FPR tuning (standard or modified), not necessarily to increase pressure, but in reality most of them used it to reduce Fuel Pressure to achieve optimal fuel feed.</blockquote>

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Japan GT 2012

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