mk1spyder

If I made a custom intake manifold to run 2x stock TB's on my s65amg with the wires spliced so the computer thinks it is only controlling one, 2x would simply draw more amperage.

auburn2

It would be possible but it is not just a splice.

There is a feedback sensor on the throttle to recognize blade position. I believe it uses a potentiometer with a voltage reference. At a minimum you would need diodes to prevent cross feed through from one to the other. It could probably be a simple discreet circuit but I would need to look at the schematics to be certain.

mk1spyder

Why not just use one feedback reading from one TB but control feed to both. Since they are the same TB the feedback should be the same.
​

ItalianJoe1

Problem with that is the ECU still sees the current draw from the TB, so if you run two and it requires twice as much power to open them, at full throttle it will exceed what the max should be. It may cause a limp mode type issue or a panic closing of the throttle.

There's always a way around it though, if you get creative enough. There are stand alone options now which would be able to handle it, but they are not cheap.

What are you trying to setup with the dual throttles?

mk1spyder

Because the stock intake manifold and TB are garbage for an engine easily capable of 1000hp, it is setup like a chevy vortec truck engine that is about 40% efficient. Look at the M137 V12 or the M120 intake manifolds.

StarvingArtist

If your configuration allowed them to be close together, you could remove the spring from one and physically link them together.

mk1spyder

I like where your head is at, putting them close together would not be an issue.

Welwynnick

Try fitting the M137 throttle body gasket for starters - it won't stick out into the air flow like stock.


Nick

auburn2

You could do that. As long as you did not have a failure and the two throttle bodies were well matched in terms of position/voltage it would be fine. If they were not well matched you would have an imbalance but the O2 sensors would probably take care of that difference.

The problem comes when the drive motor on the throttle which is not referenced starts to fail - then you are essentially running it open loop with an improper transfer function (do not confuse with fuel/spark open loop, not the same thing).

auburn2

Does it sense a current draw or a reference voltage? I think it is the latter but I could be wrong. Either way for what the computer "sees" it is doable but not with a simple splice.

ItalianJoe1

I assume, as most ECUs do, it looks at voltage drop across the motor circuit, which has a known resistance, and calculates amp draw using Ohm's law. The only actual current measuring i've seen is done on battery/alternator systems with actual ammeter rings around the cables or in the battery control modules.

mk1spyder

New idea, why not use the BBK 90mm TB that the E55 guys use? Should be the same for the most part since they use our TB as plug and play upgrades.

Welwynnick

https://mbworld.org/forums/w211-amg/...-kit-55-a.html


Interesting idea, but I think it would require modification of the manifold and Y-tube.