Paddleshifter?, Transmission linkage Options

[stugray]

How about:
1 - we add an electric oil pump (high pressure) for cooling to the trans

2 - we take all the shifter forks off the shift rods and attach hydraulic rams to the ends in a bolt on endcap/tail cone.

3 - Hydraulic pressure from the pump drives the cylinders.

Actuate cylinders with a custom valve manifold or a microcontroller.
If you put a hydraulic actuator on the clutch lever, you could automate that too.

[bandjoey]

With of course the proper accessories

[Dr Evil]

(IMG:style_emoticons/default/av-943.gif) Excellent!

[Dunc]

IMHO, a sequential mechanical shifter would be a nice change for all around use, but paddle is not worth it. More of a novelty.

Some day when I get time I will develop a sequential setup.... (IMG:style_emoticons/default/rolleyes.gif)

How are you going to do a barrel in the 901? It would be much easier to pick a sequential from Hewland and do a new bell housing.

Why does it have to be IN the 901. All you need is a mechanism to put the shift shaft in the right place. No need for internal nothing.

Guys,

Your comment about putting the shift shaft in the right place is exactly how the Master Shift (or is it Shift Master) system works. As I understand their system, it uses an externally mounted mechanism to move the shift shaft. The mechanism uses electric motors. The system has a computer that takes a signal from the paddle that in turn transmits the gear selection to the mechanism. It seems to me that using solenoids would be better than motors.....but with all that said, $2900 seems like a lot of $$ for such a setup.

[Dunc]

Easier would be two solenoids and to program them to be at a certain coordinate with a certain number of shifter inputs. Easier in the long run with far less machining and expensive work.

Yeah...I like solenoids too. I visualize a system of 4 solenoids (ignoring reverse for a moment) The solenoids are mounted on the case at the shifter fork. The solenoids mount such that each solenoid pulls the fork into a certain gear. The solenoids are activated by a floor shifter in the cockpit. The shifter activates each solenoid indivdually via a switch mounted at each location in the "H" pattern. Upside: a lot of fun to set up. Downside: a ton of time to do it.

[Dunc]

Easier would be two solenoids and to program them to be at a certain coordinate with a certain number of shifter inputs. Easier in the long run with far less machining and expensive work.

How about one that moves the side shift console selector for and aft, and one that moves it up and down?

Then a shift lever with a rotating disk with electrical contacts to engage the correct solenoids at the correct time.

My idea used 4 solenoids.....yours is better I think. The shifter could have electric switches mounted at each position in the "H". So far as I know, solenoids only pull one direction; but maybe there are two way solenoid. If not, then each solenoid must have a spring to pull the shifter the other way....

[Mike Bellis]

The action of a solenoid is too fast for the clumsy 901.. Something would break... (IMG:style_emoticons/default/driving.gif)

[Dunc]

The action of a solenoid is too fast for the clumsy 901.. Something would break... (IMG:style_emoticons/default/driving.gif)

I suppose that is why the Master Shift system uses electric motors. Are any other xmssns less clumsy?

[CrashDown]

A full stock rebuild done with dealer sourced parts could easily reach that figure, done in a retail setting. Would you want a $6K/7K tranny (with installation labor) in your $4K/5K daily driver?

The Cap'n

#becauseracecar

[stugray]

I actually thought about this some more and came up with this:

Take a tail cone similar to a tail shift.
Install a cam through it horizontal & perpendicular to the shift rods.
Each shift rod has one rockerarm/follower and one camlobe on the camshaft.
Each camlobe has three heights: In, Middle (neutral) and Out.
The cam would have 6 positions each one 60 degrees from the last. (neutral is 1/2 way between rev & 1st)

If you turn the cam from the first position:
rev -> lobe1 = Out, lobe2 = Mid, lobe3 = mid
neut -> lobe1 = Mid, lobe2= mid, lobe3= mid
1st -> lobe1 = In, lobe2 = Mid, lobe3 = mid
2nd -> lobe1 = Mid, lobe2 = Out, lobe3 = mid
etc
etc.
Then your shifter is just a cog turning mechanism that can bump the cam one up or one down (CW or CCW)

[CrashDown]

I actually thought about this some more and came up with this:

Take a tail cone similar to a tail shift.
Install a cam through it horizontal & perpendicular to the shift rods.
Each shift rod has one rockerarm/follower and one camlobe on the camshaft.
Each camlobe has three heights: In, Middle (neutral) and Out.
The cam would have 6 positions each one 60 degrees from the last. (neutral is 1/2 way between rev & 1st)

If you turn the cam from the first position:
rev -> lobe1 = Out, lobe2 = Mid, lobe3 = mid
neut -> lobe1 = Mid, lobe2= mid, lobe3= mid
1st -> lobe1 = In, lobe2 = Mid, lobe3 = mid
2nd -> lobe1 = Mid, lobe2 = Out, lobe3 = mid
etc
etc.
Then your shifter is just a cog turning mechanism that can bump the cam one up or one down (CW or CCW)

This made my head hurt....

[Steve]

Instead of adding AC, power windows, power mirrors, paddle shifters and power steering, why not just buy a Boxster and be done with it? I have seen one or two of the above turn out ok, but most of been hack jobs that end up for sale.

[wndsrfr]

Has anyone installed a paddleshift system on the 901 transmission? I would be interested to hear about the experience....i.e. installation difficulties, cost, vendor, etc.

OK...I just gotta ask....could a PDK tranny be mounted in a teener??