So, I was just on the RX-8 Forum, and got an explanation for the Mazda instructions on using the car.

What Mazda has told owners of the new car is if they move the car, to rev it up to 3-4k and then turn it off.
I thought "this is nuts, why???".

The explanation is the engine will be turning over fairly fast when you turn off the key and injectors. The engine will continue to turn over after the injectors are off, thus clearing out the unburned fuel injected into a cold engine for the "choke" effect. Makes sense to me. Why didn't we figure this out years ago?

Kudos to Mazda for this - another benefit to the older RX-7 crowd from the new technology of the RX-8 and continuing development of the rotory and "human interface".

 

Makes some sense, but if the engine is cold, I'm not revving it til 4k anyways. I just go take my car for a ride if I ever need to move it. It's another excuse to drive it

 

Please correct me, if I'm wrong. But I thought the 7's accelerated warmup function -- it rev the engine to 3000rpm on startup -- do the same thing? I've had flooded engines even turning hte car off right after the warmup. Maybe 3k rpm isn't high enough?

I find the best solution for me is to leave the car running for a few minutes, least until the temperature gauge moves to the center.

 

That warmup function is not your friend...
You dont want cold internals spining fast- thats bad.

 

Yes this is what your suppose to do, it will dry out the combustion chamber so next time there wont be unburned fuel in there possibly

 

 

couldn't you do the same thing by just flooring the car while turning it over? move the car, shut it off, then restart it while flooring it to clear any fuel.

In my FD at least, flooring it on start-up cuts the fuel off, just for clearing a flooded engine.

 

Holding the accelerator to the floor cuts off the injectors on RX-7s since 1989 (second second gen ;-), 3rd gen., and now on the RX-8). If you've ever flooded your engine and try to clear it this way, you'll understand why you want to -PREVENT- flooding. It takes forever, and is very hard on the battery and starter.

As for those worried about reving it cold, this is no load, and as you've just moved the car, the internals will be marginally warm. 3-4k isn't reving it much. It's different than the AWS because that system revs. it right from start, when the engine oil pressure is 0.

On further consideration, I could entertain comments about what this procedure does to the cat. (pre-cat actually). It probably puts a bit of raw fuel in it. Doubt it would hurt, but is certainly something to consider. I doubt the fuel would reach the main cat even if you didn't have a pre-cat.

 

I dunno if this is bad or not, but sometimes for ***** n giggles during a cold start up, I will very slowly rev the needle to 3krpms for a split second and then quickly let go, thus causing a loud pop.

Bad or no?

 

Ive been doing this unconscienly for a while, since my dad does it on all his classic carburated cars as well. Weird =P didnt know.

 

i started to do it when my new streetport and single went in. not only does it clean out the engine, it cleans out your primary injectors, making them happier in the long run. this unfortunately makes my turbo timer useless. if i do need to move my car, i wait til my car is fully warmed up before i shut it off. i've flooded it before and its a pain to fix, i went through all the steps they tell you, and nothing worked, so i ended up doing the pull start to get it going again. so now with my new motor i'm doing everything the right way.
just my .02