Porsche 911UK Forum

Welcome to the @Porsche911UK website. Register a free account today to become a member! Sign up is quick and easy, then you can view, participate in topics and posts across the site that covers all things Porsche.

Already registered and looking to recovery your account, select 'login in' and then the 'forget your password' option.

CLR Project Leichtbau: adding lightness to the tune of 250kg

I have a 1998 C2 manual with the 220 diff. You can feel it working even on the road under acceleration, but on the track it was obvious it had nothing left to give under deceleration. The back end was very loose under braking and clearly a fresh clutch pack in the diff would have made a difference. I'm not so sure I would get to appreciate it on the road though, I simply don't drive that close to the edge when not on a track.

When I put my spare gearbox in I will be swapping the LSD over and I'll be getting it freshened up as well, as I'm keen to see if I can make use of the stability it provides under braking.
 
I'm assuming the weight saving target escalated as much as it did to compensate for the size of your balls....?!!! :eek:
- impressive (if as crazy) as ever - easily my "go to" thread on the forum whenever I sign in after a few days.......
 
Sorry guys, it's been crazy the last few weeks. I was under a lot of pressure to get the box overhauled with the new diff going in at the same time, it is also quite a tricky process to set the diff up. I then needed to bed in and test on the way to the UK as I had no other chance. It wasn't quite plain sailing and I had no room for manoeuvre. In the UK the car underwent it's first independent test with a motoring journalist and even the Editor of the magazine was in attendance, to get a feel for the project. I believe it will be in the next issue of the magazine so I look forward to hearing their thoughts.


Jamesx19 said:
Nice one ELA.

As usual, no messing about with half measures!

Is the diff a GT Guard item or something sourced in Das Vaterland? Judging by the signs in the backround of the pics, the gearbox was built locally as well?

Look forward to your feedback of the on road characteristics. I'm thinking of a GT Guard rebuild kit for my standard GKN LSD, ($1800 plus postage and taxes) or go with the Wavetrac Torque sensing type. The advantage of the proper LSD is that it works during braking. But is that what you need or want for road use......??

Very interested to hear your thoughts,

The diff is basically a custom plated type diff which was developed in conjunction with a Motorsport company in Germany.
The Auto Torque Biasing diffs are a bit of a compromise and not something you would ever see fitted in a competitive environment. I decided to go for a full fat diff but went easy on the settings. To my mind this meant I should meet the objectives of Fast road rather than full attack but safe in the knowledge that I have the real McCoy fitted. So 40/60 dual ramp angles were chosen with only a 25lbft pre-load, which after full shake down should settle somewhere in the 20lbft region.
At first I thought there was a serious issue when I fitted it. It was seriously noisy and a very unfamiliar driving experience. It also took much longer than quoted to settle down; around 600miles rather than 60. But it is now far better than when first fitted. There was a little issue with a leak, I think from the L/H diff output flange but I have dropped the car off at the gearbox specialist to look into this yesterday. Still waiting to hear back from them.

First impression (once settled) is it has massively transformed the character of the car; probably more than any other change I have made. It is a serious bit of kit and probably on the edge in terms of what most would want in a out and out road car. I live in area where I have some wonderful driving roads on my door step and this car is for those special times when I want to have the ultimate driving experience, so for me this diff is magical and the slight slow speed/tight turn issue I can live with. The stability under braking and acceleration is phenomenal. Transitions are pretty smooth so long as you drive understanding what the diff is designed to do. I will however give a better review of the diff once I get a few more miles under my belt.

demon said:
I'm assuming the weight saving target escalated as much as it did to compensate for the size of your balls....?!!! :eek:
- impressive (if as crazy) as ever - easily my "go to" thread on the forum whenever I sign in after a few days.......

Very funny demon :grin:
I've not been able to do many updates of late, but at this stage now it is all about the testing/set-up... so no big component changes anymore. I still have the Brakes and Re-map to do but other than that, the TUV Approval process is all that remains. There are however going to be some independent testers trying the car over the coming months (also the one last week in the UK), so hopefully you'll be able to get a better feel about what this car is like from those that know how to write and their opinion will be completely unbiased, which I feel is probably a better way to go about it that me babbling on.

Many thanks for all the other comments and words of encouragement guys :thumb:
 
Please do keep the updates coming. You may not think some of it is very interesting, but trust me, we really are hanging on your every post. Perhaps you could do a video of some of the remap process/rolling road, or tell us more about the brake set up and other fine tuning.

Sorry I couldn't get to Beaulieu, like a tit I had left the master switch on in the plane and had to go back on sunday morning and pull the cowlings off and jump start it from a car for a fellow owner. I had been hoping to fly down to Goodwood and see another car mate, then fly back and take the 911 to see you. In the event I achieved neither.

Do you have any plans for another visit to England any time soon?
 
Martin really sorry to hear of the troubles with your A/C and the knock-on effects. I currently have no plans for another trip to the UK just yet, but I see T8 is planning a little Spa trip in September which I may pop along for ;)

I am honored that you have taken an interest in this project and will try my best to keep you up to speed with developments.
So latest news upon return from the UK; I took the car directly back to where the Gearbox had been overhauled with the new custom diff fitted due to a leak. Well they have stripped down the diff again and found a few technical issues which I don't want to discuss on a public forum and aim to sort ASAP. The diff is now being sent to an engineer for analysis and hopefully I'll get a report back early next week. The trouble is the company where the car is, after today will be closed until the last week of June. I have arranged for a serious motoring journalist (read as the best ;) ) to review the car later in June, with the aim of producing a video. I have not informed him yet of this latest development as I am hoping by some miracle to get this problem resolved, like yesterday. I also planned on sorting out a few fine details like noises... but am now stuck with the car a 5 hour train ride away. Disaster to put in mildly :sad:

As alluded to above though, I have now had it confirmed by the author that the review/article will be published next months magazine which should be released around 1st July, if I'm not mistaken.

Below are a couple of pics I was sent of the diff this week.




 
Martin996RSR said:
Sorry I couldn't get to Beaulieu, like a tit I had left the master switch on in the plane and had to go back on sunday morning and pull the cowlings off and jump start it from a car for a fellow owner. I had been hoping to fly down to Goodwood and see another car mate, then fly back and take the 911 to see you. In the event I achieved neither.


Ha, you weren't the first and won't be the last.
I remember the chief pilot, back in the the day when I was on turbo-props, having to explain to David Bowie why he couldn't fly the band to the next leg of their tour for the same reason, he couldn't jump start it from his car either!
 
ELA said:
Mirrors finally ready and have been shipped out today :D

Any more details re. these...? (meant to ask before getting side-tracked by gearboxes and diffs)

I started fantasising about RUF RGT mirrors recently as well as staring hard at pictures of 996.1 Cup cars.....
- your mirrors look very much the same vein (although I'm ultimately staying in the body-coloured rather than cleared carbon route)
 
demon said:
ELA said:
Mirrors finally ready and have been shipped out today :D

Any more details re. these...? (meant to ask before getting side-tracked by gearboxes and diffs)

I started fantasising about RUF RGT mirrors recently as well as staring hard at pictures of 996.1 Cup cars.....
- your mirrors look very much the same vein (although I'm ultimately staying in the body-coloured rather than cleared carbon route)

Sorry Demon, I actually answered your question sometime back but it appears something must have happened. It also looks like all the pictures have gone from this thread???

Anyway in answer to your question, I basically took original RUF mirrors: these ones on page 10 here then had them made in Carbon fibre. They use all original ruf electrics and mirrors (which are actually BMW), bolts... They come with RUF instruction manuals. They are identical but just made out of polished Carbon instead.
 
ELA said:
It also looks like all the pictures have gone from this thread???

You need to check the photo bucket thread. Apparently you need to give them $399 or find a new image host :nooo:
 
Just read your article in 911 & Porsche World - car is awsome 👍 Great work and a great read..........nearly as impressive as your updates on here!

Reading it as it happened makes me feel I'm involved in the build - thanks for the experience 👍
 
Colin and all the rest of the 911uk members. Probably best if I say a few words.
Although my car is currently in pieces, (have found a slight design flaw in the trick LSD recently fitted; not to worry though as in the process of redesign as we speak), I feel I owe a massive thank you to all those that have participated in this thread and offered your words of encouragement, brilliant ideas or simply pushed me on to get the bloody thing finished (still not managed this yet :grin: ).

Getting to this point has involved all the emotions including some I wasn't aware I had. But I am happy to be in the final throws of this project now, with a car that truly and fundamentally is all I could ever wish for and more. I am very lucky to have had the support from everyone here and there have been some real hero's. Even had a very kind IT whizz from here knock up the logo for me completely out of the blue. Our very own Alex Yates was able to come in at the final hour to help out with a few issues (namely sending me over some emergency rations of Warburtons Crumpets)...

A special mention has to be said for SlippyDiff. We have spent many an hour on the phone together, with me sending designs or scribbles/silly ideas and he has always been there with his words of wisdom. He even came up with the name 'CLR'. Absolutely instrumental it getting this car to where it is today. Thank you Henry :worship:

Steve Rance of PH has also been a true gent in offering his support and ideas and many others. Come to think of it EGTE even offered to send me back the wheels I had sold to him, just to enable me move the project forward :worship: Things like this make all the effort worth it. There are so many other examples like this, so once again a massive thank you to you all :)

Now Colin mentions he has read the article; I really hope it delivers the true character and feel for the car. I don't have a copy yet so I wait in nervous excitement. If anyone else has read/seen the article I'd appreciate your honest thoughts :thumb: Whether they be critical or not, I consider all opinion as part of the process to create new ideas and improve the design.

This is by no means the end. The testing phase and fine tuning is a massive part of the development. I then have the approval stage and still have a few other bits and pieces I'm still considering.

Where this leads going forward I really don't know just now. I would first like some time to enjoy the car and try and learn how to drive it. It is now so far detached from where it all started, it is almost like learning to walk again. Hopefully, in the not to distant future, there will be one or to other independent reviews which, if anything, will give me some feedback and ideas on how to improve the design/set-up if required.


Dicso, thanks for the info about the pics ;) Looks like I'll have to find an alternative way to upload pictures :sad:
 
Richie - photobucket had ruined this thread by hiding your pictures unless you pay for storage :( you're no doubt still seeing them in cache but they're gone for me.

Stupid PB :(
 
Arry I'm the same mate, can't see anything and I'm not going to pretend to know what you mean by cache. I'm certainly not interested in the idea of having to stump up $400 a year to add a few pics though. Trouble is getting them all linked here and knowing which ones they were, is now almost impossible. I'm open to any suggestions in how to overcome this problem though from one of the clever computer guys on here ;)
 
Host them on facebook
 
Richard,
Have just read Jeremy's article and you have nothing to fear; he rates your car very highly indeed.

As do we :thumb: . Keep on inspiring!
 

New Threads

Forum statistics

Threads
124,357
Messages
1,439,465
Members
48,716
Latest member
993gtnut
Back
Top