Brilliant! I have a LSD for the 928 gearbox (G13) and have been intimidated to attempt the measurement, shimming and backlash measurement/adjustment. Different gearboxes but the concepts are the same. Tusen Tack!!

Awesome, I've been looking forward to the next installment in the 964 series. There's always so much to learn from you, thank you, mate! edit: TIL I learned how an LSD works. I also love your engineering approach and the clever use of 3D printing to prototype in your workflow.

@islandworks

6 ай бұрын

It’s a great way of combining engineering and practice by using 3D printing in this way! Thanks!

Great video, as I'm placing a 930 transaxle in my 912 (as well as much more HP, rear suspension mods).

Nice video. Most Porsche's factory limited slip is 40% locking. My 1979 928 has the factory m220 locking differential and I did the break away test and the minimum was around 22 Nm. My 82 911 SC doesn't have one and to be honest, a limited slip on street used classic air cooled 911 with anything under 300 hp is pretty much useless. The engine location obviously adds the advantage of traction. A front engine rear drive like the 928 can somewhat benefit from a locking differential. I always assumed the 930 came factory equipped with one and they didn't. It was an option. To my suprise, many 930's have open diffs. Many 911 experts actually say it can cause adverse oversteer in street use.

Great video Jonas - as always 👍🏻 Considering installing LSD on my 964 also, so really good to see what type of job this is. Look forward to the next video sir 😃

@islandworks

5 ай бұрын

It’s a fun job! Good luck with it!

Nice work Jonas, and always so nice tools you make!

@islandworks

6 ай бұрын

Try them your next time around that area of the car!

These videos are brilliant, think I’ve watched everyone of them

@islandworks

6 ай бұрын

It’s fun making them as well!

Jonas, please please please when your using your press, put some safety glasses on, when bearings go they can fly everywhere, we have one at work that's actually in a cage for that reason.....A good idea too when setting bearing clearances is to flap out the ID of your old bearing so it can be removed easily then use your new bearing right at the end, saves pulling a bearing on and off with your press and the pullers.... Top quality video as always mate 😉👍🏻

@islandworks

6 ай бұрын

That’s really good advice! It’s so easy to take the quick way at home when doing it properly only takes a few seconds more!

To help put things in perspective, I race a Mazda MX-5 in the State, when I ran a clutch pack LSD, I would set the break-away to 80 ft lbs (~108 nm). Your 100nm is ~74 ft lbs. Therefore, your break-away should be very nice and manageable. Also, it is desirable to have lower break-away in braking, especially when trail braking into a turn. Otherwise will cause excessive understeer. Keep up the good work!

@islandworks

6 ай бұрын

That’s a great reference thanks!

Your method for measuring the preload is genius! Might have to do the same on my 915 gearbox.

@islandworks

6 ай бұрын

It worked really well! Get a printer and use the tools from my webpage next time :-)

My friend, you probably should work for Koenigsegg 😅 Great episode once again!

@islandworks

6 ай бұрын

If only they built Porsches!

I'm always amazed André, love the engineering and at the same time discovering as an hobby mechanic.

@islandworks

6 ай бұрын

It's my passion! Thanks for being a long time follower!

Nice one, enjoyed that

@islandworks

6 ай бұрын

I enjoyed making it!

Always look forward to your videos! Thanks for the update

I have an E92 M3 with a drexler in it and it has 86nm of preload.

Always great to see progress on this.

@islandworks

6 ай бұрын

Great to make some more progress!

Very detailed! 👍Thanks for sharing!

@islandworks

6 ай бұрын

Thanks for watching!

Amazing work, I love how you just make your own tooling to do these jobs!!

@islandworks

6 ай бұрын

It’s great satisfaction seeing it work!

Did you get the distance from the centre of the drive shaft hub to the printed pointer and dial gauge holder from Porsche…. This is critical as any deviation from the distance from centre means the measurement of backlash is meaningless

@islandworks

6 ай бұрын

Yes, it’s in the workshop manual and is 80mm

I had a truetrac diff on a front-engined V8 (LS1) sedan and it was wonderful to drive. I assume this diff, coming from a cup car probably has more lock under decel than accel, which a truetrac style diff cannot provide. I believe this is common for stability under braking for mid and rear-engined applications? Nice work either way, great use of custom tools to make your job easier!

@islandworks

6 ай бұрын

Lots a great alternatives out there! Im looking forward getting to test this one!

great video!!! i wonder, does anyone make a Torsen diff for G50s? i never had much succes with clutch type diff and love the torsen on my lotus!

@islandworks

6 ай бұрын

I think there is one that fits, but not sure. I got a good deal on this one!

Are there LSD with infinitely variable preload? Like with a ring on a threaded shaft that would preload a spring a bit more or a bit less?

@islandworks

2 ай бұрын

Believe it or not by the 964 C4 has a progressive diff like that actuated by a lever and a hydraulic cylinder. An amazing gear box but also a very heavy option

@anidiotinaracingcar4874

2 ай бұрын

@@islandworks Thank you for this answer!

I like to put paint on the pinon shaft to see where it runs on the crown wheel just to be sure

@islandworks

6 ай бұрын

I had blue marking the gear in the plan as well but time got the best of me!

Another great video. Surprised you didn’t opt for lightweight aluminum side covers.

@islandworks

6 ай бұрын

The switch out the LSD casing you mean? Is that an option?

@rushbrady4120

6 ай бұрын

My reply was deleted. Patrick Motorsports makes aluminum side covers.

Thank you very much for this video.. Just a few questions, why not choosing an Wavetrack differential (seems to be very popular for the 964)? is it possible to share where to find all the bearing and shim kit we need? Im plan to install a wavetrack on mine G50. Thank you

@islandworks

6 ай бұрын

I found this one from a friend that was selling it. The 996 cup diff has a very good reputation for track applications but there are many other good alternatives. I got the shims from Rosepassion in France. Look under the 996 GT3, they are less costly than the ones under 964 and should be the same thing.

Like how you just tear into everything! Question, on the C4 transmission, I know about the center differential clutch pack, but does the C4 have a limited slip standard in the 64 type tranny?

@islandworks

6 ай бұрын

The G64 is a marvel of engineering and one of the best I’ve ever seen (if you need AWD). It has two controlled and actuated LSD and one open diff for the two front wheels. So yes it has the same diff between the rear wheels.

Is it too much to ask for some sand blasting or ice blasting for the aluminium case? It’s aesthetics but would help my OCD and remove a few 100 grams of grime…. 😂😂😂

@islandworks

5 ай бұрын

I would love to get it done too! It would be much more pleasant to work with for sure!