Question for anyone else out there reading this (first off, I just joined this forum today so I am still learning how to navigate on here so I apologize if it's already on here somewhere

...the sales guy at the dealership told me to rev the engine to 5 rpms before turning it off each and every time to avoid flooding the engine as I'm sure ya'll know, what I'm curious about though is in the manual it says to rev it to 3 rpms...any suggestions here? I don't know if it makes a difference at all really aside from using a few drops of gas more, but let's face it, with gas prices these days every drop counts...so yah, 3 or 5 rpms? and every time it get's shut off for the duration of it's life?

(p.s. the look you get from people before shut down from the rev, priceless!)

Thanks everyone! Looking forward to spending some time in this forum!

 

I rev to 3,000 I would believe the manual vs what some sales guy tells me. Just do what the manual says and you will be fine.

 

I've heard 3000 or 4000 rpm. I've never heard 5000.

I used to use the 4000 rpm procedure: rev to 4000, hold it there for 10 seconds and turn off the key while doing 4000. Once the temperature recall came out I stopped doing that. I do plenty of short moves and decided I'm just going to treat it like any other car in this regard, at least when at home. Maybe it'll flood one day and I'll change my tune. In the meantime I have stopped worrying or caring about short moves at home -- I can deal with a flood if it happens at home. On the road I am more inclined to make sure the engine is warm before shutting down; but it's usually not an issue as the engine is normally warmed up anyway when I get somewhere.

 

i rev it anyway before i shutoff (for cheap thrills). If im not mistaken the new flashes fixed that problem. Most of the time i don't rev before i shut off.

 

I didn't know about the revving. Never rev'd before shutdown and never got a flooded engine. strange hey!!!! I drive below 4000 rpm most times. I have the AT.

 

Just another example of a dealer sales rep not knowing anything but unable to resist the urge to fill all silence with gibberish. First of all, it is only for short runs when the engine isn't at operating temp. Second, the manual says 3k.

Personally, I don't like revving the cold engine to 3k let alone 4 or 5.

 

It's not required with the latest PCM flash, but it doesn't hurt to do it.

 

Never revved it before I shut it off. like it has been mentioned above, the new flashes have corrected this problem. oh yeah, welcome to the cult.

 

I always rev to 3000rpms and shut it down, never flooded

 

^^^

plus it sounds cool

 

I never do it unless I'm just moving the car out of the garage for washing. Two years, zero floods.

 

personally,I shut down my high output stroker mail box long before the bills start to come due.... tends to wary off the junk mail...

 

I rev before shutting down because of what I have seen in my Canscan logs. You see at idle, gas is pumped in so that my engine idles at 14.7 - 15 AFR. By revving it a bit and let go of the gas pedal, AFR goes 20. This means very little or no gas at all is pumped in until it stops at 1000 rpms and then proceeds back to idle again (with gas pumped in).

So now, why do I rev it before shutting it down? It just feels comfortable for me knowing that no gas is being pumped in before I totally shut off the ignition :D

 

Socal ... the other fellows are correct about not having to rev EVERYTIME you shutdown. This procedure was mainly to prevent flooding for people who move their car very short distances and/or for us folk that experience sub-zero temperature. For us winter people, it's especially important that our engine temperature is up before turning off. Sometimes I could be driving for 5-10 minutes in the winter and not see the temperature gauge at half yet ... so for us, revving before shutdown ensures that there is little fuel left in the rotors (as xyntax described).

Personally, I don't think that the actual RPM matters .. just as long as the rotors are spinning out the excess fuel when you shutdown, it's all good!

 

Not necessary to rev before shut down. The new Flash took care of the flooding problem.

 

I don't bother ever since I went from the L to M, then N and now R flash. I believe that was an old PCM issue.

 

I think as a precaution, we should still keep this in mind for short moves or subzero temperatures where the engine is not warmed up complete (despite the new flashes).

 

I'm so use to reving before I shut down, anything else I drive I rev it . I'm in the habit , hard not to do it now. I don't think it hurts anything, thats why I still do it .

 

I never really developed this habit because I wasn't sure if I should rev it, let it return to normal rpms and then turn off or turn off while I still have my foot on the gas and the car at the higher rpms.

Instead I just never turn the car off if it isn't warmed up past the "C". Today I had to go back in the house after I had just started the car. I sat there and waited for the car to warm up before I turned it off to go back in the house. It takes a few minutes but it's worth the added insurance against a flood.

 

My father (who knows if he makes sense or not) always reved his muscle cars up and turned off the ignition...says something about blowing out the carbon. I figure it works the same with a rotory...but I honestly don't know.

Besides with a sound like that who can resist, and why stop at 3-4k?! :D I usually drive like a grandma--not always, but usually--so would one high rpm rev before shutoff be good/bad/or null? (oh, and I always let it warm up on it's own before shutting it off; that isn't an issue for me)

 

Hey everyone! Thanks for all of your responces! Lot's of help! Any of ya'll out there female like myself or am I in man land? (Which I wouldn't mind hah! Yes, I'm a girl, and heck yes! I have an RX8!

 

I never rev my 8, even when washing it in the driveway then moving it into the garage. Have 18K miles on it and last problem was 16 months ago before my first flash.

The guys that use to rev old muscle cars were just washing the insides with raw fuel and probably causing more carbon than cleaning. The older carburators do not know that the ignition was turned off, so would still dump fuel into the engine during the slow down time. The newer carbs have a shut off valve and EFI systems shut the injectors off so they both shut the fuel off when the key is turned off, so not much problem.

 

^ It depends on when you shut off. Here's what happens IMO:
- Rev to 3K and shut off: Fuel is pumped in and ignition advance is added. Shutting power off immediately will cause unburned fuel to be left inside the chambers.
- Rev to 3K, release throttle, let it rev down and shut off: Fuel is pumped in and ignition advance is added. As soon as rev starts dropping, throttle body is opened slightly (almost closed), fuel is off, ignition advance is at -5, AFR is at top lean. If you don't turn off your engine, a second or two after rpm reaches 1000, ECU changes ignition behavior for idle setting, pumps appropriate fuel and ignition advance.
- Turning off after idle (no rev): fuel off, ignition off, AFR at stoich, engine quits spinning. To my understanding, stoich AFR only happens when air and fuel are present at the proper amounts (not lean or rich). If your engine stops right where a rotor is at its compression phase and before combustion phase, doesn't that mean fuel is trapped between the rotor and spark plugs? :D

...you figure out which you'd prefer from the above choices.

 

Figure out which I'd prefer? I can't even figure out what you're TALKING about! Could you translate this to English (or Klingon) for those of us who don't speak car? Thanks!

Krankor
05 Shinka 6MT

 

^ ok then...

Refer to the smilies:
= You shut off the engine with so much fuel left inside the chambers
= You shut off the engine without fuel inside the chambers
:D = You shut off the engine with little fuel left inside the chambers.

Is that simple enough?