Savage XL conv. problem with Reverse module

Hi all,

I finally got to do the first little road test of my XL conversion project.

The Savage XL it pretty standard: the 3 speed tranny, stock brakes, 52T spur, 15T pinion, own designed motor mount, HPI reverse module and mixer.

Everything seems to work smooth on the bench. But on the road I have problems with the reverse module. After giving full throttle forward, the reverse module decides to go into reverse!!! ugghh nasty sound!

I followed the mixer setup program several times. I tried to use either the ESC signal or brake servo signal as input CH2 on the mixer. It stills pops out of forward. The servo actually change position, it's not just some mechanics being pushed. I use a Graupner C577 servo for the reverse module.

I dont get it - how is it possible? I only run on a 7.2V NiMH pack, so the car runs real slow (I dont want to break anything at this stage!).

Anyone having experience with the reverse module and mixer?

Thanks for any tip, hint or comment!

- Lars