Bump. Does anyone know the answer to whether this tune helps with rev hang on a manual IS250? @RRRacing I would hope it would do seeing as it modifies the throttle position?

@eddysoares I'd be particularly interested to get your view if you don't mind. You said you have a manual IS250. Has this RR tune fixed the rev hang at all? I find the car to be very horrible to drive during the 1st->2nd shift due to this terrible rev hang.
(Double clutching does help, but it's still not perfectly smooth unless you wait for the revs to drop)

 

Can't speak for the tune, but your time spent fixing that issue might start with how the clutch is being operated. Ping @Ultra4 He is just a step away from deleting the nonsense between the pedal and the pressure plate making it "normal" for a lack of better words.

What are you willing to invest to fix this issue?

 

It's honestly not so much the clutch - it's the throttle response. Even if I am just sitting in neutral with clutch pedal up, and I tap the accelerator, it will immediately jolt the revs upwards, but then the revs decline slowly.

It's difficult to explain the problem with words - this website explains it much better with the two videos:
http://www.revhang.altervista.org/index-Yaris.html

When I take my foot off the accelerator, I expect the throttle plate to close and the gas to stop being injected into the cylinders. However, sadly the way Toyota designed the ECU, it keeps pumping fuel in for a short duration after you've already lifted your foot off the gas pedal. It's some BS to do with emissions apparently.