Front AP kits and OZ futura

Front AP kits and OZ futura

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Discussion

red_devil

Original Poster:

31 posts

216 months

Thursday 25th December 2003
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Just try to put front AP conversion kits to my S4s, but clearance between caliper and wheel is not enough. So, have to put 2mm spacer. Does anyone know any side effect of wider front wheelbase by 4mm? Dr.Hess might know it, pls advise.

karlfranz

2,008 posts

238 months

Thursday 25th December 2003
quotequote all
You should NOT put spacers on the front wheels. Changing the front track will definitely affect the handling.

The AP calipers are "fatter" than the Brembo. They will collide with the spokes on the wheels. This is exactly why I think we need a kit that will retain the existing Brembo calipers and put bigger discs. The kit would be cheaper because you wouldn't have to buy new calipers and you can keep re-using the same pads.

Our existing Brembo calipers will allow for 330mm discs up front, and 320 mm rear. There is already a Lotus bracket for the rear calipers we just need one for the front. Then we need to get discs and hats that will retain the relative position of the existing discs.

I've been talking to several folks about the possibility of making such a kit. If I get any news, I'll update the group.

red_devil

Original Poster:

31 posts

216 months

Friday 26th December 2003
quotequote all
Thanks Karlfranz, agree with you Spacers are to be used as the last resort. I'm really curious what is the real side effect of increase the positive offset of wheel. I just remember I have a book which I bought in 1984 when I studied in the USA. This book is "HOW TO MAKE YOUR CAR HANDLE" written by Fred Puhn, 1st printed in
1976, 2nd in 1981. He said "Adding positive offset to wheels can make a car corner faster because the wider track reduces wight transfer. However, there are som side effects. On the front of the car, increased positive offset increses the distance between the steering pivots and the center of the tire. This makes the car steer harder. It also increases the loads on the steering system which increases the steering-linkage deflection, and this may require extra toe-in to compensate. All these things are undesirable, so if possible keep the front offset near stock." He also said "if necessay go ahead with small changes in offset and don't worry about bearings. It only becomes an intolerable problem with a large change in wheel offset, say more than 2 inches." He also mention if spacers have to be used special attention must be paid to the lug nuts and spacer must make full contact with wheel. So I might try positive offset for a while, let see the result. BTW if you want copy of this book, give me your address I will send a copy to you airmail from THAILAND to you at no cost. I learn a lot form your website. I read every line before I own my 1st esprit. My email is chalermsak.sugar@inet.co.th

rob.e

2,853 posts

246 months

Tuesday 30th December 2003
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Red Devil - your best bet would be to keep your AP conversion but get yourself some V8 spec wheels. All the styles fitted to the v8 (ie AWI/ Saturn/ Nova/ Magnesio etc) will fit the ap brakes no problem. A lot of UK S4s's have V8 wheels fitted as the uk climate and salted roads in the winter takes its toll on the S4s's futura split rims.

MikeyRide

267 posts

233 months

Tuesday 30th December 2003
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In theory, it will make the car understeer a little less but I think 4mm total will be in the noise.

karlfranz

2,008 posts

238 months

Tuesday 30th December 2003
quotequote all
rob.e said:
All the styles fitted to the v8 (ie AWI/ Saturn/ Nova/ Magnesio etc) will fit the ap brakes no problem."

All styles except the OZ Futura Modular, that is...

gixxer

103 posts

229 months

Tuesday 30th December 2003
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Putting a spacer behind the front wheels would increase the scrub radius. This would tend to make the car steer easier at lower speeds and steer harder when the outside tire is loaded up in a corner. The car might tend to wander more on uneven roads and have more steering "kickback". If you have power steering, at 2mm, you might not notice a thing. If you have manual steering, it could be an interesting and worthwhile experiment.
Notice I say "TEND".
2mm ain't much.
Don't look forward to any increase in cornering power with a 4mm increase in track.
If you make some quality examples up and get tired of them, feel free to sell them to me.
Brian

red_devil

Original Poster:

31 posts

216 months

Wednesday 31st December 2003
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Yes, Karlfranz, all V8 styles will fit. But it will cost me twice of AP kit. Finally I end up with spacer 5 mm from
BRABUS (Benz mod parts), made from good quality aluminium, 2 mm still too close. I will take it for a test run next week (still in garage for some engine works). If thing getting worse, my last resort is V8 wheels.
And for Brian, my 2 mm spacer is custom made from stainless steel, by my friend's machined shop, aluminium is too thin. It would be fragile. If you really want it, give me your address, I'll send it to you (send not sell). No cost, just for friend, don't worry. This is a good thing to be member in this forum.

rob.e

2,853 posts

246 months

Thursday 1st January 2004
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red_devil said:
Yes, Karlfranz, all V8 styles will fit. But it will cost me twice of AP kit. .


There were several sets of v8 wheels for sale at the club lotus show at stoneleigh in november - about 800 was average from memory for second hand AWI style.

red_devil

Original Poster:

31 posts

216 months

Friday 2nd January 2004
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Thanks Rob.e, but I live in Bangkok THAILAND. And the latest Esprit import to Thailand is S4S.