Post #379
Suppose i'd best do a little update on this.
I've had some AP 4-pots lying round for months which i've been intending to fit for a while, after the last trackday last year when i used the last of my pad material i decided it was one of this winters projects to properly sort the brakes out.
I've looked over other big brake threads in the past and always get put off by usually having to go to bigger wheels, i'm a tight northerner so having to buy other sets of wheels and more expensive tyres didnt appeal to me.
Fortunately a few others have squeezed decent size discs under 15's, which inspired me to have a crack at it. Enough waffling on, i'll let the pics to the talking.
First off i needed some 28mm thick discs to suit the calipers, using info from other threads i knew i wanted a minimum of 300mm and the maximum would probably be around 315mm for getting inside the pro race 1.2's, so i bit the bullet and ordered some 310mm discs from hi-spec.
I went for the ap racing copy version with a 46mm swept area, meaning the eye diameter would be slightly larger so i could offset the disc further back and have part of the balljoint inside it, meaning the wheel wouldnt need to be spaced out quite so much.
Once i had the discs i got some scrap steel and did some PCD drilling so i could see how far i could offset the disc before clearance would become an issue.
IMG_2091 by
Steve Count, on Flickr
I have a spare 16mm hub with the balljoint still in it in the garage, so i used that to keep offsetting the disc then give the balljoint a good wiggle to see if it would touch the disc, i think i managed to get the offset to 15mm before things got tight.
Luckily i then decided it would be worth the time and effort of taking the setup out to the car and double checking, it was as on there with the 18mm balljoint the disc was hitting the ball cup.
I moved the disc until clearance was fine and ended up settling for 12mm offset.
I don't know if its the size of the balljoint that affects the clearance, or if its just different balljoint manufacturers that make the cup part to different sizes.
Either way, i'm glad i checked before i went ahead and made the bells.
IMG_2098 by
Steve Count, on Flickr
IMG_2102 by
Steve Count, on Flickr
Once happy with the offset i could work out the dimensions for the caliper brackets.
I knocked up a temporary bracket out of an offcut of ally angle to check i'd got it right. I had.
IMG_2118 by
Steve Count, on Flickr
I had to buy another set of wheels since i'm pretty sure the xantia steelies i've been using for the roads wont clear the new setup, fortunately some 1.2's came up for sale on here, 15x7" et16 just like my current set so i snapped them up.
I then used these to check the clearance before i went ahead and made the brackets and bells.
IMG_2149 by
Steve Count, on Flickr
IMG_2149 by
Steve Count, on Flickr
IMG_2151 by
Steve Count, on Flickr
The wheels wouldn't fit if i kept the bell 8mm thick, so i had to space the wheel out slightly. I just kept shimming it out until it would rotate freely, once i knew how much i'd shimmed it out i added a few mm for extra clearance and set about making the drawings.
I was going to incorporate the spacer into the bells but decided in the end to make the spacers separately.
Next step was to order in the material and get it machined.
IMG_2157 by
Steve Count, on Flickr
IMG_2160 by
Steve Count, on Flickr
IMG_2163 by
Steve Count, on Flickr
IMG_2176 by
Steve Count, on Flickr
IMG_2177 by
Steve Count, on Flickr
IMG_2162 by
Steve Count, on Flickr
IMG_2168 by
Steve Count, on Flickr
IMG_2175 by
Steve Count, on Flickr
I gave the calipers a good clean.
IMG_2184 by
Steve Count, on Flickr
They are now at the powdercoaters.
I want all the aluminium hard anodising, so to make the most of the minimum order i stripped pretty much anything aluminium from the car ready to take to the anodisers.
I also thought ahead on how the tyre seems to have rubbed on the wing with the standard spacing and thought about the wheels having a slightly wider track and decided that adjustable topmounts were the solution. They are now on order.
I haven't seen the top mounts yet but i know that due to KW being awkward using 60mm springs, 2.25" spring cups wouldn't fit so i'd have to make my own. Cue more aluminium turning.
IMG_2187 by
Steve Count, on Flickr
They're pretty heavy, but i'd rather them be like that than too weak and fail on me.
I also took the time to remove excess material from my poorly thought out droplinks, they now look suprisingly like someone elses.
IMG_2167 by
Steve Count, on Flickr
I also made a couple of other bits for when i get the topmounts.
IMG_2190 by
Steve Count, on Flickr
I'm pretty sure there wouldnt be enough thread after the spherical bearing to make use of a nyloc, so i made my own and i'll just use a drop of loctite on it.
I took all the ally parts to the anodisers today, should be ready next weekend all being well.
I've got new caliper pistons, seals, bell mounting bolts, pads and a few other things on order, all being well they will be delivered next week so i can make a start on building it up, conveniently i've got most of the week after booked off as i had to use my leave up at work.
I should at this point say thanks to Phill for being helpful whenever i've had any queries.
I think that's about it for now, it's taken an insane amount of time, effort and money getting to this point, hopefully now i can ease up on the spending for a while.
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Goldie the track car.