Do we have such thing as "Fly By Wire" Throttle Control ?

Motec is asking me if I have this on my VIII ? I answered No

Where and how can you locate this fly by wire thing ? is this some kinda kickdown thing which is found in most of BMW cars ?

 

I believe they are talking about having an electronic throttle rather than a mechanical throttle cable. And no we don't have one.

 

I actaully think it is the STI that has something like that

 

Thanks God too. Our E46 M3 has one and sometimes it really pisses me off.

 

The Evo doesn't have it. The sti has it.

 

my understanding of fly by wire is that it is a mechanism used to control throttle. instead of your foot directly controlling the throttle body when you step on the acceleration pedal, a sensor detects how much you press the acceleration pedal and opens the throttle accordingly...the reasons why fly by wire exists is for economy and emissions reasons..

 

IF am not wrong, I think the fly by wire thingy is on Evo 9 ?

Because they even asked if I had "Variable Cam Timing" which I believe is "Mivec"

 

looking at all the EVO 9 motor pics i've seen, i don't see the normal "throttle cable" looping around the top of the valve cover. it is possible that the evo 9 is "drive by wire" which will really suck as far as modding goes. the 350Z, all BMW M series, all benzes, & STI's run that method. that would explain their reason to go with variable valve timing. Kansai Service already has a shop car so i look forward to seeing what they can do with it.

 

The madness already has begun with the 9

JUN Evo 9 GT demo car. Car features the MIVEC variable valve timing system which, as some in these circles say, is proving to be a weak point of the usually bullet-proof 4G63

 

basically, as bobaab said, you replace the cable mechanical linkage with a wire and sensor that tells a motor how much to move. sensor on/near the pedal, motor on the throttle body or what have you.

Planes used to use cables back in the biplane era (and some modern light aircraft still do). With huge jumbo jets, a pilot cannot move control surfaces with his puny arms and legs. So they use hydraulics and the pilots' controls tell motors how much to move the ailerons, etc.

advantages: you can move large heavy objects more easily. Can possibly put logic in between to smooth out motions. (e.g. Stealth fighter flies because computers keep the plane stable, on top of the pilot's inputs).

disadvantages: more points of possible failure. more weight. lose any kind of direct tactical feel. cost.

Sometimes I think I would love to just get a super 7. about as simple as you can get. But then no 4 doors or trunk and God forbid anyone hits you.

 

most of the evo 9 motor pics are jdm and dont need to loop the cable

 

Throttle by wire typically gives the car a "laggy" feel. Personally I hate it. It was one my IS300 and its in the wife's Mazda6. It can make the car feel very smooth on acceleration, but doesn't typically provide the sensitivity I would like.

Like in heel-toe downshifting. Those TBW systems usually need more throttle input (pedal travel) than the mechanical linkage to get the same response. Thankfully, the 8 doesn't have it.

Alot of the current systems still have an actual throttle cable as the input and as a safety backup.

 

Evo 9 is using a non-linear potentiometer for the TPS.

And MIVEC is indeed variable cam timing on the intake side. It's nothing new as Subaru has had AVCS on the STIs for some time already.

 

now, here's an interesting thing, my 05 RA might have throttle-by-wire, but if it does, it's the strangest way to do it i've ever seen.

the throttle cable comes through the firewall, across the motor, to the passenger fender. there it attaches to a cam and spring (very similar to the typical throttle linkage at the TB). this has a sensor on it and the wires run somewhere that i can't readily discern (still learning my way around the engine bay)

a closer look at the TB reveals a plug very similar to the plug at the end of the throttle cable, and another sensor/motor.

once i get a buddy around (sometime tomorrow) i'll have someone watch the bay while i work the pedal...

strange

JJ

 

Throttle By Wire (TBW) isn't that big a deal. The EVO is already an Electronic Fuel Injection (EFI) car, meaning the computer determines how much fuel to inject based on driver input (gas pedal), and a couple of other sensors (rpm, load, boost, etc.). So with TBE the amount of air to "inject" (opening of the throttle body) is also determined by the ECU, again based on driver input (gas pedal position), and the other usual sensors. The concept can make the engine a lot more responsive in theory, because it can produce a linear accelerator response - the power output of the car increases / decreases the same amount for each small amount you push on / lift off the accelerator. In practice, manufacturers proram the ECU more with gas milage and emissions in mind instead of performance, but a TBW systems gives you the potential to tune your thottle response *a lot* just by tweaking software - just like a tune for AF usng software which only works becaue of EFI instead of having a carburator. The 7th gen Celica had a mechanical throttle through 02, and then switched to a TBW for the years after that. I've driven both and didn't notice any difference at all. Bottom line - it is a good thing because you get another parameter you can tweak for tuning via software, and it is bad because you have to fight the stock programming on one more thing for very basic bolt ons. Since getting some sort of flash / piggyback / replacement is pretty much unavoidable for any power upgrade already, it doesn't really change the picture in a bad way.