Cable driven throttle body on 2007 1NZ?

[Leonard_Church]

I did an oil change on a scion with the 1NZ the other day and they had an analog throttle body on it and was wondering if anyone had thought of converting their yaris to the same layout and, if so were there any codes being thrown about it? I'm not a fan of ETB's and much rather the old style throttle bodies.

[CTScott]

To do so requires standalone engine management, in place of the ECM, as the drive by wire throttle is a key input (via a dual circuit) to the ECM and without it being present the ECM will not feed the injectors. On Garm's turbo Yaris he had done the cable throttle, but he was running standalone management.

With the stock ECM the only way to make it work would be to feed the ECM a pair of fake accelerator pedal sensor signals relative to the throttle position sensor on the throttle body. This is doable, but would require some development to do.

[cali yaris]

+1 - won't work without changing using a standalone ECU.

[Leonard_Church]

Thanks for the response guys. Guess I'll stick to the fly by wire system then.

[Flipper_1938]

I've thought about making my yaris think it is a toyota echo.....convert to throttle cable and non-abs brakes.

What all does the ecm control? ...what would you loose if you ran a yaris with the echo ecm?

[CTScott]

Originally Posted by Flipper_1938

I've thought about making my yaris think it is a toyota echo.....convert to throttle cable and non-abs brakes.

What all does the ecm control? ...what would you loose if you ran a yaris with the echo ecm?

The Echo is not CAN based, so you would have issues with the power steering, body ECU (door locks if equipped, door open status, etc.), and instrument cluster if you switched to a Echo ECM.

If there is enough interest and a commitment to the interest, I would be willing to develop the interface necessary to allow a cable throttle to work with the stock Yaris ECM.

[CrankyOldMan]

Originally Posted by CTScott

If there is enough interest and a commitment to the interest, I would be willing to develop the interface necessary to allow a cable throttle to work with the stock Yaris ECM.

I thought that there had been some development along these lines, but the TPS conversion was found to be unfeasible. Perhaps I'm mixing up something else?

At the moment, the only benefit of drive-by-wire that I can see is automatic idle adjustment to prevent stalling when creeping/cruising at low speeds without having to ride the clutch. Granted, I'm OK with lots of clutch action to regulate it myself, but a more aggressive spring plate may be in my near future and that could become a nuisance. I suspect that the DFCO jerk would also become much more pronounced when slamming the butterfly closed, no?

Either way, I'd love to participate in developing/prototyping this system.

[bronsin]

Originally Posted by CTScott

If there is enough interest and a commitment to the interest, I would be willing to develop the interface necessary to allow a cable throttle to work with the stock Yaris ECM.

That would be a blessing. I cannot BELIEVE manufacturers have gone to the wire actuated system given its obvious problems. It does not give positive throttle control. In tight manuvering situations this could cause an accident.
I can think of traffic situations where it could cause an accident.

That the government, with all its "safety" laws like airbags, ABS etc hasnt made the manufacturers stop making an obviously defective feature is hard to understand.

No wait I do understand it. The government is an IDIOT!

[Flipper_1938]

I'm pretty sure it all has to do with stability control. The car has to have the ability to over-ride driver inputs.

[tk-421]

How different is a cable-driven throttle to a DBW with a throttle controller? I think the latter is better because I get to tweak the sensitivity depending on traffic conditions...

[bronsin]

Originally Posted by tk-421

How different is a cable-driven throttle to a DBW with a throttle controller? I think the latter is better because I get to tweak the sensitivity depending on traffic conditions...

All I can say is drive an ECHO. It doesnt need tweaking.

[bronsin]

Originally Posted by Flipper_1938

I'm pretty sure it all has to do with stability control. The car has to have the ability to over-ride driver inputs.

Hmm interesting.

That takes us into a whole another thing.

We are being convinced we dont know how to drive!

And of course once the powers that be convince us of that, they get a big payday!

Yeah!

Hey give my my $100,000 I dserve and I'll go along with it.

Seriously rear view cameras do anything for safety? I mean shouldnt you look behind you and proceed cautiously?

Also it if frequently the front wheels that run over kids with the car backing up. They will run around spastically like kids do out of the picture of the camera.

[Flipper_1938]

Originally Posted by bronsin

All I can say is drive an ECHO. It doesnt need tweaking.

I liked my Echo much more than I like my Yaris.

[tooter]

Originally Posted by bronsin

All I can say is drive an ECHO. It doesnt need tweaking.

Man, I totally understand...

I went from a cable operated throttle body on my 1996 Tacoma (just like the Echo) to the drive by wire on my 2012 Tacoma and the difference is night and day. I really miss the immediate positive linearity of the old cable system. And it was immediate in both directions on and off the pedal.


Greg

[tk-421]

Originally Posted by bronsin

All I can say is drive an ECHO. It doesnt need tweaking.

That doesn't really answer my question, though... Have you tried a throttle controller on your Yaris yet?

[tk-421]

Originally Posted by tooter

And it was immediate in both directions on and off the pedal.

My throttle controller really minimized the lag to the point that it's basically imperceptible... Plus I get to increase said lag to help with fuel economy when the tank's almost empty.

Don't get me wrong, I'm all for trying out new things... But is it really better not to have the option to adjust throttle response based on different conditions?

[bronsin]

Originally Posted by tk-421

That doesn't really answer my question, though... Have you tried a throttle controller on your Yaris yet?

Oh no I havnt.

Im strictly a stock owner.

No springs, mags, turbos or sway bars for me!

[tooter]

Originally Posted by tk-421

My throttle controller really minimized the lag to the point that it's basically imperceptible...

Does it also minimize the lag when you let off the throttle? Do the revs drop off quickly? I might go for one if it did that.


Greg