I have been looking for some thing different to get the drive out of my budget Bug build up .
This a early 911 sporta matic trans axel ( semi auto )
The gear box is manual shift , you dont have a foot clutch as you move the shifter the valve in the gear box triggers the vacuum actuator to pull the clutch in .By the you have shifted into the next gear
What I am doing :
I am in the throws of reading about the internals of the gear box & the ratios .Finding Infomation regarding this is not that easy to date .I will work the ratios out when I pull the gear box down .
The fluid for the gear box is the same for the motor ( shares the oil pressure ) via a port on the side of the trans .
The gear box has a dry clutch as well , then a wet converter .
My idea tis to make the gear box a full manual , buy modifing the internals & fitting a LSD diff from a WRX R160 rear diff .
Here is the gear box on a early motor
Looking for that special lady : PM me for coffee & cake
The WRX diff ( center ) is just a LSD drive section , remove the crown wheel , machine a adapter to take the porsche crown wheel , machine some adapters so the bearing carriers fit back up , machine some drive flange out put shaftsfor it are your away , nothing to hard for me
what happened neil..from all out to budget build!!!
i forsee problems.
"what kinda creator would make a race of people
and make em act a certain way or else He deems 'em evil?
HOW can You give a living being the freedom to breathe
and then lead em into a sea of decievers who greet em, see!"
fair enough, no arguments here. i just thought by budget build he would be cutting some corners in order to save coin.
which is all good but down the track may cause dilemmas.
just gotta wonder why these traans are so cheap?
"what kinda creator would make a race of people
and make em act a certain way or else He deems 'em evil?
HOW can You give a living being the freedom to breathe
and then lead em into a sea of decievers who greet em, see!"
1916 wrote:just gotta wonder why these traans are so cheap?
maybe because they're crap? No one wants sporto 911's so they all get wrecked for body parts etc.
Never did get to drive one myself and I worked at a porsche specialist for a year. I think i saw one all year and that was coming in for a pre purchase from dodgy car yard, It wasnt even drivable due to issues with the sporto.
They've mostly been converted or scrapped.
On a similar note apparently al lot of the BMW M3 SMG's got conversions back to manual as well.
Now if you want a nice box the late 993's auto was very impressive to drive, but this was largely due to the electronics and the 7 (i think) shifting modes. As you pushed it harder the shift points move up, the shift pressures increase etc. But for day to day driving it was a nice soft auto. The top shift mode was virtually impossible to get into except in a race track!
I have a mate who used to own a 911 sporto. One of his mates said, "oh they're crap". "Right", said my mate, "I'll show you how crap it is". Took the guy out for a spin in the local industrial area. Pulled into a culdesac, revved it up to 6k and dump it, drove the car sideways round every corner with the tyres smoking. When he mate got his breath back he managed to say something along the lines of, "ok, I was wrong". It's not about the gearbox, it's about the driver. 😉
Like semi auto beetles, they are fine once you get used to them.
I have worked out that I can make the gear box a full manual with mods to the bell housing .I will be removing the vacuum clutch set up fully & fitting a quality pull cylinder to the clutch fork .
I have two ways I can do this
1) get the stock clutch tested to find out the claping force .Then machine a plain fly wheel the same weight as the WRX fly wheel .I will have to part off the ring gear from a 200mm vw fly wheel & fit it to the custom fly wheel . In the center there will be a female spline to locate the gear box drive shaft , this is 20mm od .
I found out my adapter plate to vw / Subaru is the same
2) just leve it as is & see how it goes
Looking for that special lady : PM me for coffee & cake
Is there no way a subaru box can have the ring and pinion flipped so that it can be used in a rear engine setting? That would do away with the adaptor and then you would have a wider choice of boxes with better and cheaper spares avail? Also the subaru drag crowd have good luck with the subaru autos I believe?
Just a thought, but im sure someone has tried already!
I have not fliped the ring & pinion .I have removed it & used the Center LSD .
Subaru autos cost up to 6K to build , they snap the main shaft as there is oil holes in them .They do last longer that the manual boxes
Up date #
I have done away with the oem clutch & now going to make the main shaft come right through to the converter side of the box .I found the spline is the same as a vw clutch , so the Kep 2100 lbs 200mm unt is on the converter side now .
I just need to machine & female spline to couple the cut down 2ltr kombi shaft ,fit the clutch fork to the converter side & if I am correct the Seagull subaru to vw fly wheel will line up spot on
full manual box :bounce
Looking for that special lady : PM me for coffee & cake
All those people who doubt........ you forget that Gull is a VW auto gearbox wizzkid...... have a search about the forum and see where he has posted all the bits and pieces you can do to the T3 and kombi autos to make them a good reliable, tough box option.
Would be good to see some piccies Neil - what do the guts of the box look like ? are they built bigger / stronger than the vw stuff or what ?
seagull wrote:I just need to machine & female spline to couple the cut down 2ltr kombi shaft ,fit the clutch fork to the converter side & if I am correct the Seagull subaru to vw fly wheel will line up spot on
full manual box :bounce
Why don't you use a slave like an albins or ford mondeo. they sit on the input shaft and run the lines out the top of the bellhousing. no need for clutch folks and would make it much easier and cheaper......
Thanks Chris .I droped in to see Brian to day & got some ideas just chating to him .
I then whent to my mates wrecking yard , only to find the mondeo on the bottom of the stack !
bummer have to pull the car body out with some thing stronger than my Jeep .
Thanks for the Tip , I think it will work .
Looking for that special lady : PM me for coffee & cake
