Question about the A Series Transmissions...

[Kai]

Hmm, i started a new thread in this section, said it was awaiting moderator approval...i figure you'd be able to see it being an admin n'all

 

[IJ.]

Would have been more polite for you to post a link instead of me going looking

 

[Kai]

I can't see any thread - hence why there's no link

I'm just a mere mod, and not for this section

 

[IJ.]

Everytime I see your avatar I am thankful for long shorts

 

[Kai]

Jealous of the legs Ian?

BTW - this PCS file = TEH AWESOMES! Thank you for that man, now i know *EXACTLY* what to program into the MCU!

Whatchoo reckon to the inputs? Adequate, or overkill?

 

[IJ.]

My legs are bettererrr
(well except for the huge bruise where a branch nailed me the other day)

Inputs or outputs?

Outputs are good as you can run other things with them

 

[Kai]

I'm an athlete from the waist down

Both inputs and outputs, was just going to concentrate on the three PWM solenoids for the moment and leave a spare channel - but because the MCU is configurable in software, in theory i could have upto 8 PWM channels AND upto 16 regular I/O channels (configurable) if i so choose.

 

[IJ.]

Can PWM the fans and fuel pumps

 

[Kai]

If you want i could build a PWM controller for those separately - integrating it into the transmission ECU would be a little silly

 

[IJ.]

Why would it be "silly"?

 

[Kai]

I have a 'thing' about separate units for separate functions, would rather have one thing to control the engine, one to control the transmission, one to control other functions etc - so if one thing fails, it doesn't take everything out with it

 

[IJ.]

In modern cars if one thing fails the car is usually undrivable anyway, I'd rather one box that does many functions.

 

[A. Jay]

I made a table like the others posted containing the ratios of the A340E, A650E, and R154:
_____ _ 1st ____ 2nd __ 3rd ___ 4th ___ 5th
A340E _ 2.804 _ 1.531 _ 1.0 ___ 0.705 _ --
A650E _ 3.357 _ 2.180 _ 1.424 _ 1.0 ___ 0.753
R154 __ 3.250 _ 1.955 _ 1.3 ___ 1.0 ___ 0.753

(...)
Looking at that table, the A650E looks like it's a close match for the R154 in terms of gearing - so surely the 3.73:1 diff would be okay to use?

With an auto you want a bit deeper gearing to make full use of the torque multiplication from the converter, you'd also be raising the cruising RPM so economy will suffer, the 650 with it's low 1st can give you the best of both worlds if you use the right diff ratio.

If not may as well stay with the 340 as it will be far cheaper in the long run.

... and then I went on to find a diff ratio that would make the most of the A650E. I figured I would try to match the overdrive in both autos, by doing this:

.705 * 3.73 = .753x, x = 3.492

Using the above, I came up with a formula that'll figure out how the ratios in the A650E would compare to the A340E with the 3.492 diff:

(ratio of A650E on butt-dyno) = (new diff ratio) * (A650E gear ratio) / (old diff ratio)

I substituted 3.492 for "new diff ratio", 3.73 for "old diff ratio", and evaluated the equation for each ratio (I didn't round off to the end). I made the table again, but with the "new ratios" for the A650E:

_____ _ 1st ____ 2nd __ 3rd ___ 4th ___ 5th
A340E _ 2.804 _ 1.531 _ 1.0 ___ 0.705 _ --
A650E _ 3.143 _ 2.041 _ 1.333 _ 0.936 _ 0.705
R154 __ 3.250 _ 1.955 _ 1.3 ___ 1.0 ___ 0.753

Aaah, right, i think i know what you're getting at - sorry for asking so many questions, but trying to learn something here

With the ratio's tabled above, would there be any benefit to an A350E over an A340?

If you had a little engine yeah but for a torquey 7M nope it's a WOTM.

So I'd like to ask Kai's question again, would the A650E be worth it?

I have the R154 right now because I settled and, although it's really fun sometimes, I miss having an auto. But the only way that I'll have no regrets is if I swap a 5-speed in. According to the staged modification list that I found once my car has ~280bhp, and I'd like to raise the boost to 11psi once I get an aftermarket boost and coolant gauge. Is that little enough? Lol

 

[A. Jay]

Is it worth it for me that is? If it doesn't fit without modification to the transmission tunnel then it isn't lol.


- from my Archos 5 IT

 

[Kai]

Yes, this thread is getting bumped....but, for adding info for you all. From Toymods, i present the following snippet:

The A350E is (basically) a A340E that enables the overdrive gearset in 1st for a new 2nd gear. 2.8 x 0.7 = 1.978. It splits the gears between the the normal 1st and 2nd.

Problem is controlling it (for now ). The A350E uses SIX solenoids, the A340E uses 3, and the A341E uses 4 - i presume it could be as easy as swapping the valve bodies out, but no real way of knowing, as A350E's don't exactly grow on trees...if anyone has one, or info about one, post it up