displaying posts 26 to 41 of 41

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Author Subject: How much difference have I made?
328isport

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Location: Brantham

Registered: 11 Oct 2016

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Post #26
To add, OP have you had tuition at Brands before? If not try to nab an instructor when on the next day, It'll be worth it alone just to have someone show you how to take paddock hill bend properly, it's one of those corners where most trackday goers will improve with instruction. I remember going to brands years ago for the first time with a friend, my friend took instruction and it turned out we were going in to paddock dropping a whole gear more than we should be! Given a slow run through paddock is further compounded by being slow up the hill, you can genuinely find a seconds from learning to nail paddock hill, might need a few brave pills though.. it's one of those corners! (to me anyway)
Posted 22nd Oct 2016 at 00:19
aaron6

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Post #27
I love that corner. I was turning in extremely fast there. A couple of times a little too fast and was well on the rumbles at the bottom. I was bullying an M3 on that bend as he wouldn't let me past. I was so close through there and a few other bends that I couldn't see his tires. LOL
He got blue flagged eventually.

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Posted 22nd Oct 2016 at 11:58
aaron6

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Post #28
328isport wrote:
aaron6 wrote:
328isport

Brands is not hard on the brakes?
I can guarantee it is. I was using the brakes there so hard I f**ked them. Heavy braking was how I bullied the bigger cars out the way. I came off track and the discs were blue. LOL
I know that with my now much bigger brakes I could leave braking even later and they'd take it for longer so a significant gain at brands could be had just with the brakes.

Did the op upgrade the wishbones bushes as I had weaving problems under heavy heavy braking initially. The partner p bushes have sorted that put though.


It really isn't in comparison to other circuits Aaron, the only thing you can guarantee me is that you're hard on the brakes ;-) Now whether the fact your working your brakes so hard shows your nailing your braking points, or that actually your using them more than you should be, I don't know! Obviously you'll say the former because lets face it we all like to think we're a bit handy on a circuit, but as per the OP's question without seeing lap data so we can see whats happening you can't quantify it.
I would say I was alright there. Lapped a s**t load of cars and only really had my mate in a new S3 and someone in a tweaked S14 that I couldn't catch. My little 6 seems to do well most places to be fair. If you come to pugfest next year feel free to jump in. You can make your own mind up then. Smile

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See the sheer power and might of the lesser known burrowing owl.



Posted 22nd Oct 2016 at 12:03
rory77

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Location: carshalton

Registered: 26 Mar 2016

Posts: 81

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Post #29
Well, that's not gone well.

I went to Bedford today instead of Brands Hatch. After fighting past an accident on the M25 and a fire on the M1 Slip road I eventually made it an hour late.

It was wet and I've never been there before so wasn't going to be the most informative day but by the end of my first lap, I knew I had problems.

I've got the most horrendous brake judder, I'm to overly surprised by this after fitting a set of used calipers, discs and pads but it was nasty. Would basically get progressively worse over the course of a couple of laps before becoming undriveable. Rather oddly, if I drove through it (didn't have a lot of choice on a 4 mile lap) it would get somewhat better again but not great.

Cold, wet day, i wonder if this can be as simple as the build up from DS2500s or if I have bigger problems. What do you reckon? New Pads, Disc Skim, Bleed fluid again, check all torque settings on Bells and Calipers and hope everything is OK otherwise it's all a bit beyond my level of expertise if it's anything other than that and whilst I know a hundred mechanics, I don't know a good one who is likely to a)know what they are doing Cool bother to do it right.

Any suggestions as to anyone I can take it to (I'm in SW London) or should I just to go through the basics first and go from there? Problem is that it only really presented itself on the track and I don't want another day like today to find out if I've sorted it or not.
Posted 14th Nov 2016 at 19:32
roland rat

Yeeeah Rat fans!

Location: Swansea

Registered: 29 Nov 2006

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Post #30
Don't cheap out and buy new brakes is my recommendation.

Also make sure the mounting surface of the hubs are super clean when fitting new stuff and make sure sliders are free on calipers
Posted 14th Nov 2016 at 19:40
aaron6

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Post #31
When I fitted my 310mm brembo's I had horrific judder. We changed the hub when fitting the brakes and only when checking on ramp why it juddered so badly did we notice the hub flange was not flat. More worryingly than that we noticed that the P bush on the driver side was cracked where it bolted to the sub frame. Changes them for Berlingo p bushes which are much stiffer and put the old hub back on and that was problem solved.

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See the sheer power and might of the lesser known burrowing owl.



Posted 14th Nov 2016 at 19:40
rory77

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Post #32
Yeah, I actually wondered if it was bush/suspension related but it seems to vary quite a lot depending on the heat in the brakes (though maybe more heat=more braking force=more movement).
Posted 14th Nov 2016 at 22:00
aaron6

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Post #33
Get her up on a ramp and have a good look and bar about. Wink

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See the sheer power and might of the lesser known burrowing owl.



Posted 15th Nov 2016 at 07:05
Chr1sch

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Location: Worcester

Registered: 02 Aug 2014

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Post #34
For what it is worth Bedford is very hard on brakes too so if you were ever going to highlight the issue it would be there...

From recent similar issues on a friends Audi, it came down to poor surfaces between disc & hub.

I ran DS2500's for 4 TD's at Bedford and they can get a little hot n bothered but i've never had significant build up. For what its worth, i'd thoroughly recommend DS3500's if you are going to be giving it death on track
Posted 15th Nov 2016 at 09:10
demondriverdan

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Location: Londinium

Registered: 29 Nov 2010

Posts: 2,665

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Post #35
I had a similar problem with brake judder before, think I fixed it by changing a load of suspension parts (wishbones bushes, etc.) so might be worth looking at that as Aaron suggested?

RE laptimes, a 55 second lap around the Indy is bloody fast. We've got the race car down to that and I think Carl does it in about 54s in his race car so that might be a bit optimistic. On a standard engine we could do 56s.

Don't be too concerned at laptimes. I know that's easy to say but when you get down to mid-50s you spend your entire life bottled up behind slower cars!

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Posted 15th Nov 2016 at 11:32
rory77

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Registered: 26 Mar 2016

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Post #36
Didn't take much finding...play in lower ball joints. Time to take everything apart and go through it I think.
Posted 15th Nov 2016 at 17:15
rory77

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Location: carshalton

Registered: 26 Mar 2016

Posts: 81

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Post #37
roland rat wrote:
Don't cheap out and buy new brakes is my recommendation.

Also make sure the mounting surface of the hubs are super clean when fitting new stuff and make sure sliders are free on calipers


you're probably right but I decided to get the best brakes I could get in the budget rather than the shiniest ones. At least now I know that whatever else I do or don't do, i won't be looking at the brakes thinking I should have bought better ones.
Posted 15th Nov 2016 at 17:40
aaron6

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Post #38
rory77 wrote:
Didn't take much finding...play in lower ball joints. Time to take everything apart and go through it I think.
Cool. I thought it'd be suspension related. So have you driven it since changing the ball joints?

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Posted 15th Nov 2016 at 18:56
rory77

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Location: carshalton

Registered: 26 Mar 2016

Posts: 81

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Post #39
Just put it up on the ramp quickly this morning, found the play in the ball joints and knew I didn't have time to do anything with it so left the whole lot for another day. Will get it up again early next week and go through it all properly.

While I'm at it, will change the P bushes, might as well use berlingo ones. Don't suppose anybody happens to have the part numbers?
Posted 16th Nov 2016 at 00:12
aaron6

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Location: On the sofa in maidstone

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Post #40
Message armzsc6 he'll get ya what you need.

________________________________________

See the sheer power and might of the lesser known burrowing owl.



Posted 17th Nov 2016 at 00:17
rory77

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Location: carshalton

Registered: 26 Mar 2016

Posts: 81

Status: Offline

Post #41
Thanks, went with the vibratech ones in the end. Genuine Pug front bushes, TRW ball joints, Lemforder anti-roll Bar bushes and vibratech lower engine Mount bush. Did I forget anything?
Posted 17th Nov 2016 at 23:50

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