Have been driving the car just about once a week.
Back on the R6 as well for some light street riding, which is a huge win all things considered. I recently installed a blue tail section from eBay and further modified the exhaust system.
The E30 has a vibration in the front end around 100km/h (60mph). Worse under braking, but still present when driving normally at that speed.
I have a new set of four tires on-hand (205/55R15 Yokohama Advan Fleva V701) which will be my first step towards resolving the issue. May not happen this season, so tires are tucked away in the basement until I am able.
I have reassembled the trunk which was apart for additional sound deadening installation.
I installed a manual boost controller (Turbosmart Boost Tee TS-0101-1102).
A little fine dremel work and it's tucked nicely between the intake runners. I'll flip that mounting nut/bolt over next time I have the intake manifold apart.
I went for one test run on the weekend. Due to the ball-and-spring design, the MBC alters the boost curve a bit. I have it turned all the way down to start.
So far I can hear it keeping the gates closed longer, which results in the occasional overshoot to 7psi (when getting into the throttle quickly while the engine is spinning above the boost threshold).
The rest of the curve averages 5-6psi, tapering off towards the top end. I'll get some screenshots next weekend.
I do have a MAC valve on-hand for more sophisticated boost control in the future.
It would be nice to tailor the boost curve for the whole rev range, could get a pretty flat torque curve by feeding in more boost above the normal torque peak. Could also do boost-by-gear.
That said, there is something about turning a mechanical knob to control boost that I enjoy. From a psychological standpoint, this requires a physical deliberate action to make changes (more tangible then keys on a laptop).
Hopefully that is a deterrent to "turning it up" too much and risking the engine in the future.




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