I've already posted this on Zcar, but I thought I'd also pass it by here. I'm wondering if other people have experienced these pressure levels from their stock zxt.
I recently installed an aftermarket boost gauge (Autometer)and an electronic boost controller (Greddy) on my 81 280zxt. Since I like to walk before I run, I installed the boost gauge first and watched it carefully for several days to understand what the stock boost level was and how the wastegate operated. To my surprise the stock boost was 7 pounds!! My understanding based on following this forum was that stock boost should be more in the 5.5 - 6 pound range.
I then finished the installation of the Greddy boost controller and carefully started increasing the boost. As expected, the popoff valve vented, but at 9 PSI not the 7 PSI I had read on the forum.
Is it possible that my boost gauge is not correctly calibrated? When the car is not running the gauge needle is slightly off center (to the right side of the box which marks zero for those with an Autometer boost gauge).
I was hoping to get more bang for the buck by increasing the boost 4 or so pounds from the stock 5.5 PSI. If my stock numbers are correct, I'll only able to add two or so pounds to my setup.
What have you guys experienced when you started messing with the stock boost?
Phil
1981 280zxt
5-speed conversion, Eibach springs, Tokico struts, Dynomax Superturbo, Falken tires, K&N CAI, AutoMeter A/F and Boost Gauges, Cusco Strut Bar, Greddy B Spec II boost control