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.
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.
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!!
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!
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
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 😃
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?
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.
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!
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 😉👍🏻
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…. 😂😂😂
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
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
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.
