CA18DET SS1 Sprint Car

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Re: DET SS1 Sprint Car Project

Post by td99 » Sat Jul 21, 2012 6:48 pm

"Boss reduction" I like the sound of that :D :D :D


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Re: DET SS1 Sprint Car Project

Post by tony.idle » Sat Jul 21, 2012 6:56 pm

I've made a few bosses over the past couple of years. The obvious way is to start with a billet (around £30) then turn most of it into swarf - expensive & time-consuming. What I generally do is machine an old boss (can be aftermarket or cut out of an OEM wheel) to suit a sleeve that incorporates the wheel mounting. The two are made a close fit then epoxy-bonded (&, if a short overlap, pinned) before final machining to size. The only tricky part would be cutting the splines: most of the time I can avoid it as above & if not I use a broach made from an old column. Yours looks a likely candidate for cutting into upper & lower sections, machining to fit one inside the other, bonding, then finally machining. The SS-series wheel is odd in that the fixing nut ends up as close to the top of the boss as possible whilst still leaving room to fit the cover trim. I've done two of them in the past: one for my SST with Momo wheel & one for Alan Wells' SST.


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Re: DET SS1 Sprint Car Project

Post by tony.idle » Sat Jul 21, 2012 7:04 pm

Like this:

Boss5small.jpg
Boss5small.jpg (220.7 KiB) Viewed 560 times


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Re: DET SS1 Sprint Car Project

Post by Corky » Sat Jul 21, 2012 7:13 pm

Wow, that looks nice...

Pretty sure mine's a mountney boss, but I'd have to check. I'll send you a couple of photos when I get a spare 5 mins so you would have an idea of what work was involved.


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Re: DET SS1 Sprint Car Project

Post by Corky » Tue Jul 31, 2012 8:21 pm

Door lock now sorted with a bit of adjustment to the rod positions :D

With regard to a possible rear wheel swap. I'm currently looking at 8" wheels with an offset of ET0. The standard offset seems to be IRO of 25mm, so I'm thinking that with a zero offset with 8" wheels and 225 tyres, it should easily clear the inner arches and trailing arms. There'll also be an increase in track of around 30-40mm if I've done my sums right (measured across inner faces of tyres). Modifications to the outer arches are given, but I'll worry about that later.

For the front end, I'm thinking of the same wheels in 7" with an offset of ET15 and 195 tyres. This will increase the track by 20mm over the current set up and may also require some shaving of the arches.

It's all theory at the moment, and I won't be doing anything until after Curbs. Can anyone see any major flaws in the plan so far ?

I've already been told I should be looking at 8.5" or 9" for the 225's, but I can't find any wheels within budget at the moment.

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Re: DET SS1 Sprint Car Project

Post by CNHSS1 » Tue Jul 31, 2012 9:02 pm

Competitive .ML1590 rears 15x9 minilite replicas, with 15x8 fronts


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Re: DET SS1 Sprint Car Project

Post by Corky » Tue Jul 31, 2012 9:07 pm

I thought the 8's up front may be too big, but I'm all ears. I was thinking 195 up front, but with 8" what size would you go for ?

And those 1590's are almost £200 each... Gulp..


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Re: DET SS1 Sprint Car Project

Post by CNHSS1 » Tue Jul 31, 2012 9:49 pm

Dependant on the tyres you buy, 195 or 205 on 8s would be my preference. The stretch gives the carcass extra stiffness and makes the tyre react quicker, giving a crisper feel to the steering. A195 on a 7" rim is "correct" but initial turn in will see the sidewalls move like a parallelgram allowing the cars weight to shift laterally. The slightly inclined sidewalls of a type on a wider rim, stops the tread area being able to move laterally. Once the cars mass states to move laterally and unchecked, it takes some stopping, usually promoting a slide.
Allows a lower pressure in the tyre which is a benefit to an ultra software as it will speed up heating and benefit traction too.


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Re: DET SS1 Sprint Car Project

Post by reliant-reviver » Tue Jul 31, 2012 9:53 pm

Am i right in thinking your buying the wheels to fit the tyres Steve, seems the wrong way of doing it surely?

Cheapest option would be to find some 7j alloys for the front. And get a set of steels banded out to the right width at the rear. Presuming they are legal in sprint / hill climbs?


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Re: DET SS1 Sprint Car Project

Post by reliant-reviver » Tue Jul 31, 2012 9:54 pm

OK not the lightest option, but certainly the cheapest!

http://www.ebay.co.uk/itm/4x100-BANDED- ... 3f1a725484


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Re: DET SS1 Sprint Car Project

Post by Corky » Tue Jul 31, 2012 10:02 pm

Thanks Craig, that makes sense.

Phil, noooooo I hate banded wheels. I'm looking to get the perfect set up. Wheel + tyres will be decided upon as a package and neither in isolation. Obviously there may be some compromise based upon cost. I don't have an unlimited budget......

If 8's and 9's are the way to go, then that's what I'll try and find ( but budget may dictate 8's sll round or 7's and 8's) we'll see. It's on 7" all round at the moment, and the tart in me will want all four wheels to be the same style.


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Re: DET SS1 Sprint Car Project

Post by CNHSS1 » Tue Jul 31, 2012 10:05 pm

The best tyre is the key. That means (for sprint's and hills) the softest, fastest to heat up compound with the stiffest carcass. To be fair they're pretty thin on the ground, most manufactures make say 10 sizes in 15", but only 2 or 3 may be the soft version.
Once you have the tyre, get he best wheel size, and ideally as strong and light as poss.
Banded steals are legal for sprint's hills, not light though, which compromises sprung weight.
To be honest, the best tyre, in the perfect width, is priority over weight though if youbhave to make the choice.
I've decided to go to 13" wheels simllyvto increase, albeit slightly, the range of tyres. Causes host of other issues though


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Re: DET SS1 Sprint Car Project

Post by Corky » Tue Jul 31, 2012 10:15 pm

Thanks Craig. I'm stuck between R888's soft and Kumho V70's super soft or soft.

At the moment the Kumho has it on wet weather performance (this is only based on my research) . But I have an offer of some R888's at good price.

Decisions decisions. I thought deciding on colour or leather seat designs was taxing :lol:


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Re: DET SS1 Sprint Car Project

Post by philhoward » Wed Aug 01, 2012 5:50 am

Surely split rims is the way forward; mix and match centres and rims to achieve what you want? I know there's possibly (!) a price issue to look at but might be a handy way to achieve it. As you need two different wheels, its always easier to pick up pairs (or 3's) in good nick s/h after someone else has stuffed a rim or two....


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Re: DET SS1 Sprint Car Project

Post by CNHSS1 » Wed Aug 01, 2012 7:01 am

The Batmobile wheels are sat doing nothing, but need a couple or 3 outer rims .ro make usable again.

As Phil says, splitties are the best, but Steve's struggling to justify 200 for rear minilites so 400 a wheel might frighten him lol

Speak to Alan Furness he bought Revolution split replicas from abroad cheaply

As for decisions, they are pretty simple, will the car be quicker, yes or no. Gotta get out of your polishers mindset Steve ;-)


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