From the iRacing Dirt Forums, this post by Steve Reis:
Eric Violett wrote:Curious if this would be a workaround (using iRacings limitations of not having trucks/ATVs to push start us).
1. Deactivate the clutch pedal. Real cars don’t have them, we could lose them too. You hit the gas, you go.
2. If you are less than X speed (like on the grid/pits/spin), autoclutch keeps you from stalling (again, we don’t have a way to push start)
3. Any gear or neutral acts as 1st gear (eliminate Neutral, so no revving).
4. Reverse is the only gear that has to be selected and we still need it since…you guessed it….we don’t have a way for the track crew to pull our nose off of the wall.BTW – The burning fuel is more of an annoyance for me than anything. Just hate having to listen to people revving their engines for a minute waiting for the rest of the field to join.
Believe it or not, we just finished implementation of this very scheme in dev code. N was completely eliminated, the clutch pedal disabled, and the only way to shift between 1 and R is to be stopped and holding the brake pedal.
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Overall, it seems like a good pseudo direct-drive system, that allows us to work around stalling out, needing a push start, getting turned around, etc.
Was tested last week and all seems good. Should be included in next patch or build.

the sprints and modified that use a Bert xmission have neutral and 2 speeds using a 2 handle system . Put first handle into place and hold the second handle forward you have to hold it in place, that’s low gear get up to speed say green flag and simply let go of second handle and boom top gear.