Rotational Idle

[adrenalin]

Just wondering if the car has to be running a turbo setup to make use of this.

I have been told it only works with conjuction of antilag but others have said you dont need it or a turbo.

As far as i can tell it basically switches off 1 injector each cycle ( rotated order ) and the benefeits are to cool the motor + manifolds down quicker.


If it can be done i wouldnt mind setting it up on E30 for use with track.

[Joe]

You can run it on an NA car, but why?

It's designed to cool down the red-hot turbo, manifold and exhaust valves after running lots of antilag.

On an NA motor, its pointless.

[adrenalin]

Well i guess if it has no benefits it would become just wank factor.

E30 runs on Haltech E6K so its an option on it. Was wondering if its worht it or not which you have answered.

[joshg123]

Its called turbo cooldown, and yeah its only really used for rally's and motorsport when your running red hot.

However, it sounds cool.

[ben351]

not too cool at 11pm at night when your neighbour is a angry junkie ... Ask Prototype Rob ...

" TURN THAT FUCKING PIECE OF SHIT OFF "

[Ja50n]

I get it at 4pm..."Turn that fucken POS off ya little pingpingpingping"

[EYEH8HSV]

I get it at 4pm..."Turn that fucken POS off ya little pingpingpingping"

LOL

[EYEH8HSV]

how can you actually get rotational idle?? im curious...any point of getting it if you dont have antilag?

[Skitzo]

im guessing you need an ecu that has a rotational idle feature and can control it.

[Joe]

im curious...any point of getting it if you dont have antilag?

No there isn't. It's main purpose is to cool the exhaust valves and manifold after running antilag, as well as controlling the idle with huge throttle openings.

[FranZ]

There isn't? I've seen water temps fall with rotational idle. Antilag wasn't being run on the spirited hills run either.

[Joe]

Water temps do fall with rotational idle, because its cutting spark in a rotational sequence...which means less heat :)

[FranZ]

So there is some benefit to having it when not running/not able to run antilag? :)

[Joe]

Well yes, if you want to be a ricer and run it in your NA car :D

You can't have rotational idle on its own....it comes as a function of antilag, so when you ask your tuner to setup Antilag on your NA car, they'll probably laugh :)

[Brockas]

Well yes, if you want to be a ricer and run it in your NA car :D

You can't have rotational idle on its own....it comes as a function of antilag, so when you ask your tuner to setup Antilag on your NA car, they'll probably laugh :)

I'm not sure on the details, but mine was running a form of rotational to cool it down on idle when it came over.

PowerFC has no antilag, but the fuel cut/recovery option allows you to set this up AFAIK.

Did help temps after time on the track.

[Joe]

ECU's with EGT recovery run slightly differently to rotational idle...this will allow you to run a form of rotational idle to cool down EGTs, and when the EGT's fall, the idle will return to normal. Either in combination with rotational idle, or not.

On super cool ECU's such as Pectel or MoTeC, EGT Recovery mode works in conjunction with antilag i.e. it will run less aggressive antilag if the EGT's are too high, as well as implementing EGT recovery during idle mode :)

[Fryman]

powerfc has no fuel cut recovery option as above mentioned.

it has a 3 "fuel cut" per electrical load on high, air conditioning and normal electrical load which turn the injectors on at a certain rpm on decelleration so your car wont stall.

setting that rpm lower then your idle guarantees a stall every time you back off the throttle at idle as the injectors dont turn back on and car stalls.. (learnt that the hard way)

decelleration with no throttle is good for fuel eco and rotary drivers need it all.no injector fire

fancier ecus with sensors to read egt and adjust idle control are way cool.

[adrenalin]

Exactly that is what i would use it for.

Purely coming off track and leaving it in carpark idling for a while to cool it down from thrashing it. Not drive through under cover car parks with baz arm out window

[Joe]

Its also a great way to wash your bores :)

[cplagz]

Why not just do more cool-down laps before coming off the track....or do some laps of the carpark if you care that much.... or get a better cooling system? Lower temp thermostat, triple-core alloy radiator and a decent thermo fan.

[180SXTCY]

Why not just do more cool-down laps before coming off the track....or do some laps of the carpark if you care that much.... or get a better cooling system? Lower temp thermostat, triple-core alloy radiator and a decent thermo fan.

because that doesnt sound cool and doesnt let u brag "yeah its running antilag with rotational idle yo..."

/sarcasm

[joshg123]

Why not just do more cool-down laps before coming off the track....or do some laps of the carpark if you care that much.... or get a better cooling system? Lower temp thermostat, triple-core alloy radiator and a decent thermo fan.

As some antilag systems come hand in hand with rotational.

Ie our rally car doesnt have a stepper motor so the butterfly is constantly 30% open. Without rotational, this would equate to around 4500rpm idle. Not good.

You still need air to have antilag working, so on cars such as this, the butterfly just doesnt close, so on decel the throttle is still open a bit.