Marcus01

I have a used dual mass flywheel sitting in my garage.

Yours for the courier fee or pick up for free from Cambridgeshire.

Hi Hannah,

I have recently had a new clutch fitted in my 350. I am based near Cambridge. If you are over this way I will happily give you a second opinion.

Marcus.

Count me in.

A good meet, good food, good crack.

Hope to do the next one.

Dirty car all nice and polished again.

I will be there

I'm a maybe, thought I had to go to Sheffield that day but plans are changing.

Hi Guys,

The Nippon challenge for Japanese coupes etc has a round at Snetterton on sat oct 27th. It is a 3 x 20 min race format for various categories of cars upto 300bhp.

I have clients for the Tyre shaving part of my business taking part so I will be attending, entry on the day is £13 per person.

There are other races other than the Nippon champs during the day.

Anybody fancy meeting up let me know.

I have just had a new clutch and flywheel fitted by Ross at Japex.

Very impressed by the service provided and having now run the car for a week or so have no follow up issues. It was well worth the 75 mile trip to have the work done by a Jap expert.

I will be using his services for any future work needed.

Good luck with your new business, having seen how you operated at Romford HPC I am sure you will provide an excellant service.

I'm available deffo 12 noon 1 o clock is best for me.

Hi Guys,

Having now purchased a 350z, a meet with like minded owners is of real interest. I do have some business to attend to in the morning of Oct 6th but should be available for an afternoon meet.

Keep me posted on whats happening.

Hi all,

Having now worked on a few z's now in my disc skimming business I have decided its time to have one.

I am looking for 350z with gt pack pre march 23rd 2006 preferably, either blue with black leather or grey with alezan leather.

Full Nissan service history, 45,000 miles max and minimal modifacations,

10k budget waiting for the right car.

I am watching all the usual websites for used cars and have many dealers looking as well.

Please give me a shout on anything you know of.

I cover the south east and upto the midlands(Birmingham area), anywhere around M25 etc.

With manufacturers now prepared to pay me to travel and solve major problems its always a possibility I can call on other areas on my way back to base, without a serious cost to the private car owner.

Hi Wizard,

I am not facing flywheels at the moment but it is an area I will be moving into soon.

I will update my service when the machinery is in place.

Marcus.

Hi to all,

As a new trader to this forum allow me to introduce myself and my business to you all.

I am Marcus Bailey aka tophooker on this forum and I trade as Disc Skimmers Ltd.

Specialising in ON-CAR DISC SkIMMING.

I have mated my problem/fault finding skills with my motorsport based engineering machining skills to provide a flexible specialist service solving juddering, squealing, warped etc disc brake problems for businesses and private car owners across a large area of the UK.

I am fully Nissan (Japan) approved in the UK for INFINITY CARS UK and recently I have been approved by the technical officer for Nissan UK to solve issues in the High Performance Centres in the UK regarding the GTR's.

With experience in over 125 different types of vehicles from Ferrari's to Daewoo Matiz's, I have the knowledge to help answer any questions you may have.

Checkout http://www.discskimmers.com if you would like some more information.

I have already helped solve issues for several members of the forum with longstanding problems and was encouraged to trade through the forum, hopefully my service will be well received.

Any questions just email marcus@discskimmers.com and I will get back to you asap.

Looking forward to serving everybody in the community.

Marcus Bailey.

The rear nearside disc had .005" (0.12mm) of runout on disc with the wheel torqued on.

With the wheel removed and a flat plate clamped on the runout on the disc was nearly zero.

I hand fettled the wheels mating face and torqued the wheel back on giving the same dial gauge reading as with the flat plate.

The disc did not need skimming because no DTV was evident.

I don't use the term warp, more distort under compression.

Warping is permanent and distortion is temporary, people talk of warped discs all the time when in fact it is a very rare phenomonen.

Machining the mating face will help solve the issue, I personally hand scrape the mating face flat.

There are other factors which can play a part in these issues.

Any imperfections in the mating face of the wheel, will be magnified and transfered through the disc under compression when the wheels are torqued on. This is then multiplyed by the diameter of the disc resulting in the disc not running within the manufacturers specification. Any disc not running within 0.05mm of true will run the risk of developing DTV after a period of running time. The greater the distortion the quicker the judder will re appear.

Thanks for the glowing reference Phil, So pleased the car is now good.

I never had a doubt I could solve your brake judder issue.

Enjoy that awesome car.

To the untrained eye the light/dark patches all look the same. It is nothing to do with any corrosion. I have studied your pictures of your powder coated wheel carefully and I can clearly see the problem areas. It is very difficult for me to explain with words, if I could point my finger to what I can see it would be easier you to comprehend.

You can measure DTV with a disc brake micrometer, these look like a normal micrometer but have a large u shape neck so as you can measure right into the centre of the disc. You will not get accurate enough readings with a vernier caliper.

You will need to measure in a multiple number of places from centre to outer edge of the disc and the full circumference. The DTV will only be in the region of 0.05 in height and will appear as a narrow band from outer edge to centre.

When you place the micrometer light finger tight on the disc, rotate the disc slowly so as the micrometer will slide nicely around when it suddenly goes tight and will not slide this will locate the raised area of DTV. Precision is the key and a nice soft touch with the micrometer.

After market wheels generally do not cause problems but any alloy wheel that is powder coated or refurbished can and very frequently does cause problems.

As I have informed you previously I am a small business that is solving many such issues for some very high profile companys in the uk. Companys no they have a problem but are unable solve them. I have a background from Motorsport based prototype machining where compressed distortion was a constant problem when machining alloy or magnesium components.

You are right about the lack of complaints etc, this is because very few people know whats happening. The dealerships/manufacturers will usually keep throwing discs and hubs on cars under warranty in the hope the problem will go away. I have already solved problems for Infiniti cars uk, Audi main dealers and Porsche main dealers as well as a similair problem on the magnesium wheels from a Nissan GTR.

I always admire a man who wants understand a problem before solving it. Good luck with your measuring and if you require more info just post and I will get back to you.

The pictures showing the mating face on the wheel and the dark/light contact patches on the area of compressed contact with the disc clearly show an uneven surface. This compressed distortion will transfer through the disc and after a period of time (700 miles in your case) will manifest itself as brake judder due to DTV as described by Mark@Abbey Motorsport.

It will not matter which wheels you run with now, as the DTV which is now present in your discs will always give brake judder which will become more severe as the mileage increases.

You have 2 options to cure the problem.

Option 1.

Replace front discs and pads and run non powder coated wheels. You will need to scource someone to re machine the mating face of the powder coated wheels before running otherwise they will potentialy destroy another set of discs. Make sure when fitting the wheels they are torqued on in the correct manner.

Option 2.

It is possible to machine brake disc on the car with a cnc brake lathe to re align discs to within 0.05 mm of true to the axle whilst at the same time removing the DTV. It is also possible to to solve the un even mating face with hand tools by a skilled engineer (cheaper than getting wheels machined). This option is my area of expertise.

Good luck with the re bedding attempt, ultimately I think it will be invane.

Note for Mark@Abbey Motorsport

There are many reasons for the DTV problem and yes the problem only gets worse if left un attended. I have built up a good working knowledge of reasons why this problem developes. I provide my service to specialist car businesses in your area would it be ok for me to contact you, regarding my service.

Nice to see there is good information being posted in this forum, other than some of the bilge I have read in other forums regarding these type of issues.

If you swap the wheels to the non powder coated type the problem will still exist as the discs will have worn unevenly during the 900 miles they have run with the powder coated wheels,

It initially will not feel as severe but as more miles are put on the disc or repeated heavy braking the problem will be felt.

Bent rims or balancing issues would be evident when driving the car at speed and not just when braking generally speaking.

I am not surprised you do not understand my angle, as I said I do specialise solving this type of issue and I have yet to meet any mechanic/technician who understands or has any idea what I am talking about.

The powder coated wheels can be sorted.

The proof in the pudding is when the problem is solved.

I would like to state I run a small business that specialises in solving the type of disc brake issue you have posted.

I am not touting for business, just trying to offer a informed piece of information, If you or the forum would rather I didnt contribute to this post again I won't

I am quite sure your problem is wheel related,

I recently proved to an Infiniti cars main dealer the effects of powder coating wheels can have on disc brakes and solved 3 problem cars for them. They have now changed there policy on offering powder coating wheels as an optional extra.

Nissan and Infiniti alloy wheels are constructed almost identically, when you remove the wheels take a picture of the hub mating face and post it here, it will speak a thousand words to me,

I will read your posted results tomorrow.

How many miles approx have you driven since fitting the newly powder coated wheels.

My guess would be 1500 - 2000 miles and then the judder started.

If fitting the originall wheels does not eliminate your problem (I don't think it will).

Jack the front wheels off the ground and spin slowly by hand to see if there is an area where the disc has a noticeable resistance when the wheel is rotated.

Check both wheels/discs and post the results.