2020 Supra dealership|throttle body & mass airflow cleaning & evaporator core system service?($379.9!)

[kaiv]

The B58 regulates inlet air via Valvetronic. The throttle body is there as a failsafe. This is complete BS.

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[zrk]

The B58 regulates inlet air via Valvetronic. The throttle body is there as a failsafe. This is complete BS.

I'm sorry what the fuck.

Yes, this is completely BS, but are you talking about VANOS/Cam Timing? The throttle body is absolutely not a fail-safe. I think you need to get your service manual back out.

 

[Michael-Dallas]

I'm sorry what the fuck.

Yes, this is completely BS, but are you talking about VANOS/Cam Timing? The throttle body is absolutely not a fail-safe. I think you need to get your service manual back out.

Valvetronic-equipped engines rely on the amount of valve lift for load control, rather than a butterfly valve in the intake tract. In other words, in normal driving, the “gas pedal” controls the Valvetronic hardware rather than the throttle plate.

https://www.bmwblog.com/2016/07/25/valvetronic-bmws-innovative-throttle-system/

Is the throttle body a fail safe? It does seem redundant.

 

[zrk]

Valvetronic-equipped engines rely on the amount of valve lift for load control, rather than a butterfly valve in the intake tract. In other words, in normal driving, the “gas pedal” controls the Valvetronic hardware rather than the throttle plate.

https://www.bmwblog.com/2016/07/25/valvetronic-bmws-innovative-throttle-system/

Is the throttle body a fail safe? It does seem redundant.

Take the throttle blade out and get back to me.

 

[Michael-Dallas]

Take the throttle blade out and get back to me.

Don’t need to and have no desire to spend the time & effort jacking with my mkv when the linked article explains what Valvetronic is and how it works. The video even reiterates the throttle body is a fail safe and the blade is open.

What’s your source that proves otherwise?

 

[zrk]

Don’t need to and have no desire to spend the time & effort jacking with my mkv when the linked article explains what Valvetronic is and how it works. The video even reiterates the throttle body is a fail safe and the blade is open.

What’s your source that proves otherwise?

Well, TFA for one, and the fact the throttle blade is used heavily to regulate boost as a second.

In other words, in normal driving, the “gas pedal” controls the Valvetronic hardware rather than the throttle plate.

"Normal Driving" refers to driving a car to work and back, not under boost, where the B58 uses the throttle blade to regulate boost heavily. We rely heavily on the throttle body, and it's a key parameter for tuning. (Yes, the VANOS and Valve stuff is also in the logs; I don't log it because it's completely unnecessary, at least until cams aren't back ordered any more).

Also, "Valvetronic" controls like that don't respond quick enough for things like aggressive changes in load (launch) or WOT conditions.

 

[Michael-Dallas]

Well, TFA for one, and the fact the throttle blade is used heavily to regulate boost as a second.


"Normal Driving" refers to driving a car to work and back, not under boost, where the B58 uses the throttle blade to regulate boost heavily. We rely heavily on the throttle body, and it's a key parameter for tuning. (Yes, the VANOS and Valve stuff is also in the logs; I don't log it because it's completely unnecessary, at least until cams aren't back ordered any more).

Also, "Valvetronic" controls like that don't respond quick enough for things like aggressive changes in load (launch) or WOT conditions.

That is interesting to know and TIL. I would have thought boost would be regulated with turbo wastegate. Thanks for the info.

 

[zrk]

That is interesting to know and TIL. I would have thought boost would be regulated with turbo wastegate. Thanks for the info.

It is! But in overboost conditions, the throttle body/blade once again operates as a fail-safe.

The thing about the throttle body/blade as a fail-safe, is "fail-safe" is used pretty often. It's not entirely redundant, despite what the phrase makes it sound like (emergency only).

 

[Mason]

Back on topic…

Did you get the biannual undercarriage waxing service?

 

[m010110]

Back on topic…

Did you get the biannual undercarriage waxing service?

Lol no but I bet it’s pretty bad under there

 

[kaiv]

I'm sorry what the fuck.

Yes, this is completely BS, but are you talking about VANOS/Cam Timing? The throttle body is absolutely not a fail-safe. I think you need to get your service manual back out.

Talking about Valvetronic! BMW's infinitly variable intake valve lift. It's really cool stuff. Engineering Explained has a video on it IIRC. My point was that the B58 uses a throttle-free load control like Michael said above. So the old "gotta clean the MAF and clean the TB" really doesn't apply here.

I just took a peek at the B58 PDF and it's true the TB is not just a fail safe:

With this system, a throttle valve is only used to stabilize the engine operation at critical operating points and to ensure a slight vacuum for the engine ventilation.

Take the throttle blade out and get back to me.

Of course it's all integrated and you can't just do that.

Also, "Valvetronic" controls like that don't respond quick enough for things like aggressive changes in load (launch) or WOT conditions.

FWIW every documentation I've seen says the opposite, quicker response.

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