Frank Kelly - HOW TO Set Limited Slip Diff Preload
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- Опубликовано: 4 мар 2021
- Today I'm going to show you how to take apart an Atlas LSD and change your preload settings.
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Not only are you a really good driver but also a very knowledgeable technical person.... Fantastic content Frank
Now that´s the best use for a wok I´ve seen in ages!!!!!
rosemary wont be too happy
I learnt a lot from this video, best of all was a new word GULGE, I'm going to introduce gulge into the Ards Peninsula lingo. Great video Frank, thank you.
Excellent, excellent video. Thanks for taking the time to make it, and being generous in sharing your settings :-)
Clear, concise and very informative a pleasure to watch 👍
Spot on vid, frank, I should of got a takeaway to watch this,, friday night in viewing...best programme going..
Wheres my oil pan..wok oil pan👍
Thank you Mr Kelly, it's always a blast watching you work on Baby Blue!
Keep these videos coming, love the detail! Top job Frank
NICE Realy nice to see the gutts n nuts that go into been a proper Rally car .
Two types of drivers
1, The type that is just born to drive comonly MAD but that can do things that just scare YOU ( but brake the car)
2nd. The type that do the work on the car , are maticulosly and gain a confidence of been one with the CAR.
dont beat your self up it's a game of constant learning if you can still adapt and learn, to acquire knowledge is good.
PS LOVE THE CHANEL LOVE THE DRIVING KEEP YOUR CHIN UP ...........
Thank you Mr Kelly,fantastic content👍
Loving these Frank - keepem coming!!!!!
Another good infomative vid keep up the excellent work 👍👍
Well explained video, great watch fella 👍
Another brilliant "how to" video, Thanks
I could listen to frank all day 😄😄 Keep um lit son !!!!
Great video Frank. That diff gets a good old pizzling in your hands!
Very good video, good editing, basic simple explanation on the work you done 👍
Awesome video
Thank you 😊
Very interesting vid....thanks....
the best mechanic
Hi, greeting from Goulburn NSW Australia. Just started watching your videos Great stuff, thinking of buying a Mk2 Escort myself.But while we have a great little track here, ( Wakefield) I mosty like driving on the Road/ 4x4. ( have a series 80 Landcruiser and a JK Wrangler) I have never seen anyone explain Rally car Mechanicals as well as you. I love Motorsports. Those Millington motors are the Cats Meow ! THANKS FOR THE VIDEOS !
Thanks Glen. Mk2 will be miles and miles of fun.
Hope to get back to Australia soon 🤞
frank yor best driver
Why can i smell diff oil through my phone screen? (Great video!)
Great video
Great video 👌new to this channel, looking forward to more of 😁
Great video frank, it's good to see how things work from inside 👍
Shame can't afford one like this but I'm trying and you my inspiration 👍
2:10 I hope the missus didn't see you heading to the workshop with her wok!
But seriously, thanks for these technical videos, mate. It's good to see what makes it all happen, along with the actual driving. Cheers, mate. :-)
Saving the oil for your next stir fry. 🥘
Great to see what's inside and get an understanding of how it works...
Just a little mystified on your method to increase pressure. Firstly will say I have zero knowledge of this and through the speeding up of video I may not of fully followed what you did, but here goes, slap me down if needed!
I was understanding it's like two clutches, presumably one for each half shaft? Was I following properly! You then after the first testing of pressure seemed to only increase plate thickness in one clutch, then seemed to repeat this till you got 75...
My question if my understanding was correct is: Does increasing one side not just increase one half shaft... or is it irrespective and the whole unit balances across both clutches....
Hope your keeping well Frank, looking forward to the rallies coming back and seeing you out there.... All the best to the whole team 👍👍
Argh just noticed someone commented the same... will save you an answer...
PB!
Brilliant Video thanks Frank. I'm new to your channel and glad i found you. i do have a question.. the diff appeared to fit very easily into the axle case? Is there very little preload on the carrier bearings?
Thanks Nigel. The bearing preload is minimal. I would describe it as a ‘snug fit’.
If you have to force the diff in then the bearings are under to much pressure and start to whine.
I like the whistle there of you're intro music at 2:20.
Whistle while you work 😂
Frank - you ever thought about a complete redesign of the rear into IRS or are you totally happy with the live axle setup?? Would such a thing be allowed in the classes you enter?
Thanks!
Brilliant video, I've got a Question ; How come when you did"'nt have enough NM, that you changed only the One Side and not Both Sides? I had an Limited Slip Diff in My Rallycar an Opel Manta 2.0 Gsi so thats why I am asking. Thanks for your answer Akko
So long as the plates across the diff are all in good condition then working on one side like this is fine. Sometimes you’ll need to work on both sides if you haven’t alternative plates of the desired thickness to get the result you want.
Love watching these vids, how does preload affect the handling?
Not enough preload and your LSD doesn’t react as effectively as it should.
To much preload and your car tends to push the nose (understeer)
Everyone likes different things so it’s really what works for you.
I could go much higher on preload but I want it to turn in nice so this is my compromise.
Good stuff frank. What overall diameter is the atlas crown wheel?
Ģreat vid as usually thanks Frank. Can I ask what exhaust system you use please thanks
Simpson single box stainless steel
How're ya Frank
You're not a bad hand wi the oul mk2 👍
I've seen a few of your garage view youtubes and they're all bang on
Thank you sur
This one minds me on an oul pal o mine davy "dog" Murphy
Before the days of wifi mobile phones and even touch tone phones I'd land at davys and if it was him driving that night I'd park in the fairhill and dander down to his.
I mind wan night turning up fresh as daisy hair combed good shirt on and davys under the mk1.....
Yes lad what's crackin?
Give me that 11/16 ring spanner I'm just changing the gearbox he says
Sez i is it broke?
Sez he naw i want to try the twin cam box it has a longer 3rd (1.40:1 instead of 1.43:1)
Dog Murphy 😂
Good man David. Great story. Keep them coming...🤣👍👍
отлично! у тебя только на разгон блокируется или на торможение тоже?
Great video, what ramp angles do you recommend for gravel? Something like 30/45 or 35/50?
I prefer the original ZF motorsport set up with 30/30 ramp angles. Since making this video I’ve moved away from gripper lsd and found great improvements.
@@FrankKellyRallying thanks a lot, that explains the impressive agressive driving style!
Nice wok
Total novice question. Can all the thicknesses of clutch plates not be added together to achieve desired thickness instead of trial and error?, Thinking more of a mathematical solution than mechanical. I have zero knowledge of this but thoroughly enjoying your mechanical videos
I get your thinking but it really comes down to trial and error. If your doing it often you soon get a feel for what’s needed.
What lsd is that? I’m having issues with my metal plate lsd from mfactory in my bmw 130i. The gring, hops, and noise in tight and medium corners is driving me crazy. Set the lock to 40%, but now I’m thinking maybe I should get the preload down a little bit? In my case its controlled by little springs in the inside, and you can change it by adding or removing them. thanks in advance, and great video! Following now.
Plate style diffs tend to be noisy for road use. Backing off the preload should help.
very nice work! how do you set a cw&P up? i need to do one myself for my bmw, but everyone says its hard??? it cant be!
thanks for the vid!
Same answer as to Dave Bartrams question.
Once you understand the concept and have the correct tools it’s not that difficult. Problem is if you get it wrong you chew up your cwp 🙈
@@FrankKellyRallying yes that is the thing.. Is there a chance of a second question? What did you think of the Lada and the VFTS when you saw them? Im english and they are the legens for all time!
??
@@FrankKellyRallying when you did the rally legends, there was a lot of Ladas there. there will be an amazing lada out in ireland soon too! the Russan car.
@@Avtovaz21057 ahh now I understand. Yes many beautiful Ladas with crazy drivers. Fantastic 👏👏.
I have 2 friends both building Ladas. One in Ireland and one in Russia 😜
Frank I want to ask the dumbo question... 😬😬
What does the lsd do, is it locking the half shafts together and the clutches release or in my thinking... keeping them free, but ultimately then locking them together...
I'm just struggling to work out in my head is pressure for the lsd to work or for it to release...
I get that in a normal diff, will let only one side drive and the lsd is to get both sides driving, just cant work out what's going on at 1,000 rpm on a straight road and what's happening at 5,000 rpm coming out of a corner drifting....
Furthermore what's the increase/decrease doing or not then doing. I saw in an answer with increased pressure( I presume that's further binding each half shaft to the other) you get push on and understeer. Which you don't want when trying to get through a stage fast.... but I presume in a playful way... it allows good drifting skills...
Great vid as always mate,
So I buy a LSD from a company already set up ramp angles ect bolt my CW and pinion on. Ew bearings and just bolt it in , check the backlash and as long as it within tolerance I’m ready to go ? What if back lash is out how do you get it within ?
Rarely will the backlash be anywhere near what you want when you first bolt it together Dave.
Pinion and diff are both shimmed. Original ford pinion shim is always around 40” so that’s relatively easy. The tricky part is the shimming of the diff side bearings. Firstly you need to fit enough shims behind the bearing so it’s a nice snug fit in the axle. Then you need to swap shims from side to side until you get the backlash correct. This moves the diff from left to right or right to left. Can take 1 hour or 4 hours sometimes 🙈
@@FrankKellyRallying You know what this means Frank??? Another HOW TO is required 👍🏼🤣😎
@@Farlig69 you might be right 🤣👍
@@FrankKellyRallying thanks mate , il look into it in next couple of months 👍
What suspension are you running?
Out of interest, what make of halfshafts do you use? I notice some big price differences between blue-chip makes, and I'm wondering if the performance difference is like the price difference!
I’ve been through many different makes of halfshafts over the years. Recently I’ve been using Tractive items.
Change them every 8 events.
my ford 1968 xt falcon grace restorations 302
BACKLASH YEEEHAAA
👌
Cheers for the video. Why is it call an atlas axle?
It’s a Ford axle from things like the 3ltr Capri and P100 pick up to name a few. Always known as the Atlas 🤷🏻♂️
@@FrankKellyRallying cheers
What make of diff and half shafts are you running Frank ?
Currently a gripper diff but I’m replacing it soon.
Tractive halfshafts at the minute.
I like you frank
so how many years repairing fords
Is this a Clutch type LSD? if so why'd you use Clutch type over a Locker or Torsen Diff?
Yes it’s referred to as a “plated diff”
Much more consistent than a Torsen diff and not as aggressive as a locker. Takes more maintenance but it’s worth it.
How on earth is she so spotless underneath?
I was expecting a boot floor of gravel rash etc.
She’s like new under there !
Amazing 😮😀😎👌🏻👍🏻👍🏻👍🏻
What oil do you use Frank? B373 or something synthetic?
Millers CRX LS 75w140NT
@@FrankKellyRallying
Thanks!
Last question, how often do you change the diff oil?
@@debarra136 diff is pulled out every 200/250 stage miles for a check over and oil changed then.
Frank what are the canisters on the axel for 🇬🇧
Those are the remote canisters for the rear shocks.
@@FrankKellyRallying thanks Frank . Keep on the black stuff 👍🇬🇧
Are not shims made to adjust preload?
Yes but they tend to break up so I avoid if possible
My question to Frank is how do you pass noise test?
Most of the rallies I do are outside the uk. Ireland and elsewhere aren’t so uptight about noise.
They realise noise is both fantastic to hear and safer for spectators to hear you approach.
What Ratio do you run Frank? And does it change at all. Forest or Tarmac
Running a 4.6 cwp on both surfaces at the moment.
Change drop gears in the Samsonas gearbox to accommodate different surfaces.
@@FrankKellyRallying that seams higher than most
@@BespokeBaits it’s all in an effort to limit the wheel spin that the Millington brings.
@@FrankKellyRallying got you
@@FrankKellyRallying so a less horse power engine (fast road)you would recommend a lower ratio 5.1 or 4.9
Little bit goes a long way then
Shouldve explained what pre load is first
As this is a rally oriented channel I’m assuming our viewers have a basic knowledge of the machinery involved but feel free to check out the countless videos on the subject elsewhere 👍
@@FrankKellyRallying while not an incorrect assumption to make, it is a bad one cause a lot of people like cars but dont know how they work. What im saying is the same way you broke down what makes blue go, explain some things. Education is not a bad thing and you seem to know a lot thats all
I understand. It’s always hard to know we’re to start KM.
like “ this is a wheel and it goes around in circles”
You know what I mean and I tend to get stuck in but point taken 👍
The music junked another video 👎💩
😂😂😂
LSD? a state of constant failures.
A spool is the only way to go. And check axles after ever event.
Not for Irish tarmac my friend.