E-gas

[jrdeamicis]

Love it.

[hoveringuy]

Egas, take 4? I don't know I'm losing track...

But, it works bitchin'

Installed a normal M54 electric throttle body, my new board and the electric pedal and made a grocery run this morning. It drivers exactly like before. Hard to tell about pedal feel because I had it duct-taped over the stock one, but it feels nice and smooth.

Modulation on the highway is great, no hesitation or hicups. Accelerates briskly, shifts nicely.

On the way home I even disconnected a few wires to force "limp home" mode and I limped home. Engine idles at like 5000 rpm and it goes about 30mph on flat ground.

I'll take it back off for a few weeks so that I can make an enclosure for it and decide how to permanently mount the new gas pedal.

It's an all-or-nothing conversion and it needs to be perfect before I submit my gas to the 'trons.

[hoveringuy]

Circuit boards are back from fab; everythings fits and works.

I'm bench testing the crap out of it; randomly disconnecting and shorting wires, having the cat piss on it, running it under the blow dryer.

This will be Toyota quality.

No, strike that.

[Fusion]

Wondering if the TB is from an automatic?
My Benz's throttle position sensor knows only 3 positions - idle, neutral (auto in N), full throttle. I guess because in Drive the idle rpms have to be a tad higher to hold the load without dieing. If the TPS finds any irregularities it puts the engine into limp mode.
Not sure if this is of any help to you, just my 2c.

Edit: damn, didn't notice the second page.
Good job, sir.

[george graves]

Very cool! Looks like you found a nice h-bridge too. This is really cool because you can basically program into the gas petal a "feel." All the auto makers do it to some extent. Back in the day you'd do it with a cam shaped throttle body actuator. Very cool stuff.

I might have to PM you and pick your brain regarding power filtering.

[hoveringuy]

So you have it all completely working?

One more step towards s54 swaps everywhere?

It works well enough that I'm ordering some proper circuit boards for it. I don't want anything sketchy running my throttle if I'm driving.

This would work just fine on the S54. I have made it massively heat sinked for reliability. It would replace the need for a bellcrank conversion with standalone.

[87e30]

So you have it all completely working?

One more step towards s54 swaps everywhere?

[Voluted]

Just to comment quickly on that button at the end of the pedal path (fully pressed down):

I used to drive an e39 540i with the 5 speed auto with tiptronic. That button at the bottom, when pressed, would automatically shift the transmission to the lowest gear possible no matter what mode the transmission was in.

Eg. Transmission in 'tiptronic' or manual mode in 5th gear. When you floor it w/o hitting the button it stays in gear 5. If you press a bit more to hit that button it would override the driver's choice to be in 5th gear and switch to the lowest possible gear for the car's current speed.

This doesn't help you at all with what you are doing but i thought i should point it out lol.

Sweet projects btw; i always enjoy reading your threads.

[hoveringuy]

This has been a back-burner project, but I've made a lot of progress on it and finally completed the CAD to commit this to circuit boards.

Size is 2 3/4" x 2 3/4".

Prototype in 2 weeks?

[hoveringuy]

This is a fun project but I also would like to run the stock M54 TB. If the M54 is a 3 litre and came stock with a 70mm TB with a 3 1/2 MAF, I wonder why the S50 has a 64m TB with a 3" MAF?

[Wh33lhop]

Very cool Subscribed.

I remember the valvetronic engines typically had a throttle body in the intake path "just in case" that was normally kept at WOT... kinda defeats the purpose of valvetronic, doesn't it?

[Jean]

Dude this is cool! I normally hate how the DBW cars "feel", but like you said it's probably in programming and can be fixed?

[Tchao]

M10 DBW:

http://www.e30tech.com/forum/showpost.php?p=921489&postcount=480

[balooshinakus]

Pretty sweet Steve, I'll have to check this thing out again sometime.

[FredK]

Your work never ceases to amaze me!