nismoman63 Posted November 2, 2009 Share Posted November 2, 2009 We are working on a 95 twin turbo and the cust complains about the idle.the motor has JWT BB530 turbos,740 Nismo injectors,JWT box dual pop charger,BDE cam gears,BOVs,JWT driveabilty kit and Tomei solid lift cams 270 dur/10.25 lift.The idle is 1200 to 1300,anything under that the motor dies on decell.We have have smoke checked the engine for leaks and all is good.Anybody have any experience with this? Thanks Quote Link to comment Share on other sites More sharing options...
Jehannum Posted November 2, 2009 Share Posted November 2, 2009 What's the vacuum and fuel pressure at idle? Does the tune for the car correct for the dual MAF kit? (the K value should be the same as for a 370cc/single pop setup) Also, does the car have the air deflector still in place in front of the filters? If not, search "flower pot" at twinturbo.net. What's the tune set for injector latency? I've got almost the same setup less the fancy cams and dual pop ('cept I've got GT2560R turbos instead of the GT2554Rs/530bbs). No idle issues here - dead solid at 750RPM. Is there any chance you've missed a vacuum leak? Quote Link to comment Share on other sites More sharing options...
hoov100 Posted November 3, 2009 Share Posted November 3, 2009 Have you checked the fuel and ignition maps on decel? what is your A/F's on decel with the car in gear? is it dying when you rev up the motor, or when you are driving and push in the clutch? Quote Link to comment Share on other sites More sharing options...
Administrators BRAAP Posted November 3, 2009 Administrators Share Posted November 3, 2009 (edited) One item that causes this is if the lower splash shield is removed. The Z32 is known to have an issue with the engine dying during drop throttle in neutral/clutch pushed in while the car is moving, if the lower splash shield has been removed. Usually above 30-40 MPH, the faster the car is traveling the quicker this happens. At lower speeds, the engine RPMs will rise, fall, rise, fall... Has something to do with how the ram air enters and bounces around in the MAF due to the splash shied not being in place, MAF sends inaccurate input to the ECU. Not sure if that is this problem, but something to look at. Edited November 3, 2009 by BRAAP Quote Link to comment Share on other sites More sharing options...
Jehannum Posted November 3, 2009 Share Posted November 3, 2009 One item that causes this is if the lower splash shield is removed. The Z32 is known to have an issue with the engine dying during drop throttle in neutral/clutch pushed in while the car is moving, if the lower splash shield has been removed. Usually above 30-40 MPH, the faster the car is traveling the quicker this happens. At lower speeds, the engine RPMs will rise, fall, rise, fall... Has something to do with how the ram air enters and bounces around in the MAF due to the splash shied not being in place, MAF sends inaccurate input to the ECU. Not sure if that is this problem, but something to look at. Yeah, that's solved with the "flower pot" mod. Quote Link to comment Share on other sites More sharing options...
nismoman63 Posted November 3, 2009 Author Share Posted November 3, 2009 Thanks for the help and direction Quote Link to comment Share on other sites More sharing options...
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