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If you haven't got it already, get "How to make your car handle" by Fred Puhn, An interesting and 'old school' book on all aspects of suspension design including tyre choice etc. I reckon it would give you enough information to allow you to make an informed decision. Yep, got that one, Cheers. A proper retro read, the photos are great. No relevant info on tyre width choices though. Wouldn't it be more interesting to investigate the steering rack and its geometry? Since your main problems are heavy steering (ratio to direct?) and a hint of bumpsteer. Yes, will be doing that also. I am changing the wheels to reduce the rolling diameter primarily, so just wanted to get the widths right as part of that change. |
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That one does look pretty. It's a Phase 2, so more practical than mine in that it has a bootlid - oooh, the luxury! A plan is hatched, it involves a guy in Essex that is known to a lot of you and a welder ;D ;D Making your own version of the Dunlops using the Bini steels as a base? ;D  The car is still miles away in Fareham which is a shame, because I have loads of things to check, measure, and get on with. The clock is ticking and progress is halted at the mo.... |
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Saw this at the Crystal Palace motorsport event last summer. Stunning!
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Was the suspension custom built to suit the wheels? The scrub radius will always stay the same, and aslong as you use wheels of the same offset the KPi will stay the same too. Matt Offset affects both scrub radius and KPI because they're the same thing aren't they? |
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I'm sure I can hear the engine through the pic. Pure muscle. |
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My car is 50 this year and the RRG is the genuine goal for not just being on the road, but hopefully being an OOOFF trigger. Near the beginning -  Then  Then  Now A hole where an engine that doesn't eat itself should be....  |
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Lots of seven replicas (weighhing ~600-700kg) use 185 at the front and 205 at the rear. Seems to be a sensible choice. Bear in mind that tramlining will also be affected by (IIRC) wheel offset, extreme camber, toe (more toe out = better turn in but worse straight-line stability), and perhaps caster. Is the bump-steer actual bump-steer, or is it just too-firm suspension causing the wheels to part company with the tarmac over bumps? If actual bump-steer, it probably won't be easy to fix. Feedback is probably a good thing. Thanks The more I read into suspension and steering set up, the more interesting it is, but the more I get confused by it all. Mind you - if it wasn't complicated, it probably wouldn't be very interesting. All I know is, I like this knowledge building stuff - feels like I am becoming less of a spectator in this car world. The other one I am trying to battle is if I reduce the width of the front wheel, but actually reduce the offset by more than the width, what will this mean to my KPI angle/scrub radius??  |
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Big question .. but with all the car related questions . Is the car for race, road ,style, drift ,fast road etc etc .. let's face it most cars we build are a compromise used for road Which is it for you ? I guess I would say fast road..... What does it corner like as it is? Understeer/oversteer/bit of both? How easy is it to provoke oversteer? The current tyres do seem pretty wide for the weight/power Difficult to say really, I've done too few miles driving it in anger - mostly because of the previously poor brakes. It will be coaxed into oversteer fairly easily around a roundabout at fairly low speeds There is a lot of feedback through the steering wheel over road undulations and bumps. It tends to get thrown off course by bumps, it feels like bump steer, but that is also related to the steering geometry....another variable. My gut feel so far is to go with 185 width on the front, 205 on the rear..... The car is front/mid engined, rear wheel drive and less than 800kgs. Maybe I should try and think of a car similar to use a reference. |
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Hey Guys, This isn't a question about what width tyres fit what width of wheel - there is a mountain of info about this. My question is, how do you know which width will give your car the best balance of grip, steering feeling, avoiding bump steer and tramlining. If we assume that there is no limit caused by the suspension on the inside of the wheel, and the bodywork on the outside of the wheel - because it keeps the question simpler. Maybe this question is less relevant to a production car, because there are others who have tried and tested different options. In my case, my car is completely bespoke in it's suspension and weight. I will be getting wheels re banded to fit the right width of tyre, I just don't know for sure what width to go for. I currently have 205's on the front, and 225's on the rear. I get some tramlining, and I feel the steering is heavier than it should be, so I am thinking of going narrowerer. So, how do I know if a 175 or a 195 width tyre is best on the front for example, and then, what would be best on the rear? I presume it is directly related to the weight of the car, weight distribution, spring rates etc. I just can't seem to find what I am looking for - a kind of tyre picker calculator. How do I know without expensive trial and error?       |
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Why do we keep discussing this???
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Feb 28, 2012 15:23:03 GMT
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I was just reading the old edition of Retro Cars that had these featured.
Both stunning, although the Stiletto for me is the absolute winner. I just love the design of them, would love one some day. Great that yours has been in the family so long too.
We want more pics!
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right. plans for the thing. probably wont be to many peoples taste but its going to be low and with wide steels. Where did you get that idea, I don't think you could be more wrong Lovely car, looks in great nick and the wheels look perfect. |
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Feb 27, 2012 10:35:31 GMT
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Out curse word both of them and out retro them too with an Allegro!
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Feb 26, 2012 21:46:00 GMT
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Having been to Race Retro yesterday, I could suggest pretty much all the cars on the Rally stage.
A couple that stuck out to me though were the orange 911, which seems to be pretty active on the scene, and the totally mental Chevy powered Firenza. OMG it is loud.
Not sure how the Bugatti Owners Club would feel about the likely damage to the grass that this could cause though....
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Feb 26, 2012 21:32:51 GMT
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Yesterday, I went to the Race Retro show (great event, took baby, but not camera, sorry!). The rally stage was absolutely brilliant - and someone else made a nice video, so here we go. Sideways  Image wheels had a stand. I had a chat with the Director. I stared at the Billet 46 wheel.....For quite a long time........ I saw a number of old Racing Jags wearing old Dunlops......I then went back and stared at the Billet 46 some more......The Director gave me his card and said he could do a deal - probably to move me off the stand. .....and still, I'm not going to buy them. The cost is crazy, I just can't justify it. They're also not a light wheel because there is so much metal in the centre. Had they been ultra light, I'd have found it even more difficult to say no. So, this doesn't mean I'm sticking with the current wheels though. A plan is hatched, it involves a guy in Essex that is known to a lot of you and a welder ;D ;D |
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Feb 26, 2012 21:04:49 GMT
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Talking dash?
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Feb 25, 2012 23:45:32 GMT
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Got a few things to say about this thread.... First, the car is a demonstration of the owner wanting to do something for himself. For that, it's exactly what RR is all about. I'm sure he is aware that he could have got performance from a 1.8T conversion, but clearly he didn't want to. Good for him, the world needs people following their own path. Nutter! Second, the pictures are a bit marmite, I think it's that double exposure thing? Oh well. The only reason it annoys me is it makes it tricky to see the colour scheme properly. Grey and red. Yummy. Oh, and Dan. You post A LOT on here. Not everyone will like everything. Because you drop a lot of cars in here, I'd try not to take it personally if there are mixed comments. Bear in mind, it's not your car, or your photos, and anything that provokes a reaction is worth its space on here anyway. You still have a better hit rate than Berry Gordy so I wouldn't worry. If you are asking why you bother, maybe put yourself under less pressure. I sometimes wonder if you are posting so much as some form of commitment. You would still be giving everyone enough to keep entertained with 10% of your picture threads  |
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Feb 25, 2012 21:29:54 GMT
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I saw a silver 911 Speedster a few months ago in Brighton. Looked.....well, it looked a little awkward in proportions actually, albeit headturning. Didn't realise they were so rare though!
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