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Old 25-10-2017   #16
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Re: Improving cornering

I have changed my rims for my 96 uno with 15" rims & tyres with 195/50
a little bit scratching with the rear fenders which I had to wide it a little bit to fit from front it's perfect looks aggressive and handling is super


but I still have to change the suspension to grip more on corners.












Quote Originally Posted by Steve145 View Post
Ok, so now I've got my Uno 45 up and running, I'd like it to be able to take corners a bit faster.

Current tyres are the standard size 135/80R13, ditchfinder brand.

Firstly, I'm thinking that 135 is actually too narrow for the standard 4.5" rim (should really be on a 4" rim) and that I should upgrade to the "option" 155/70R13 size. Noticable difference? Should I go wider?

Second option is the set of 14" Alfa/Speedline pepperpot alloys I have lying around. Narrowest tyre I could run on these would be 165/60R14. If I fitted these, I could also fit a set of Alfa 145TD front brakes (254mm disc, non vented), not tested yet (and I would before investing in tyres), but hoping "Fiat parts bin" means the bolt spacings will be the same.

In either case, tyres will be Uniroyal RainExpert, for a good balance between price and performance, sadly they don't make the RainSport in small sizes. Unless anyone wants to suggest something else?


Strut-brace, antiroll bar are all under consideration, but it seems sensible to start with the tyres.

A full suspension refresh is also planned, not sure I want to lower it though.
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Old 31-10-2017   #17
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Re: Improving cornering

Turbo driveshafts will make no difference to the non-Turbo as the track is controlled by the wishbones & subframe, & they are the same width on all Unos, Turbo or not. If you want to increase the track, it can only be done at the wheel, either by fitting deeper offset wheels or by adding spacers.

I corner hard 80% of the time in my main Uno, its not unusual for me to be up on 3 wheels, and sometimes 2, so I think I can offer some advice!

Tyre choice is critical on any car, and 135 tyres in my experience (on Uno`s & Panda`s) are useless for serious handling no matter what brand, I've even managed to roll a 135 completely off the rim during hard cornering in a Panda 750L! If you want handling, you need a good brand 165 or 175 tyre on an Uno, and to reduce wet weather understeer (which Uno`s do suffer from), you need a tyre with a wet grip bias.

I have 14" Alfasud Sprint/33 alloys on my main Uno, & have found both Pirelli P3000`s & Goodyear Duragrip (175/65x14) suit it perfectly, both reducing wheelspin when accelerating out of corners & both makes providing good cornering limits with good feedback & a gentle, controllable breakaway on the limit.

175/65x14`s also make the speedo 99% accurate.

I wouldn't recommend 185/60x14 without fitting spacers/having deeper rims, as they foul the inner wings (rubbing approaching full lock at the front, & rubbing during hard cornering at the rear).

I run them at 32psi pressure front & rear, but you may find you prefers a different balance to suit your driving style & front/rear weights, you have to experiment to find out!

I wouldn't recommend fitting an anti-roll bar, as, although breakaway is marginally higher, its much more sudden & is often impossible to control when it does break away.

There's no point fitting a rear ARB because the Uno`s rear axle is designed to act as an ARB. Some people have boxed/welded the back axle pressing to stiffen up the rear, but, its designed to flex, & when welded up, they've been known to crack as well as spoiling the fluidity & natural balance.

It is worth fitting a front strut brace, its also worth making sure there's no significant rust in the rear arches, and, if its had any rust repairs to them, the reinforcement panels on the underside have also been replaced (& ideally, extended).

I wouldn't recommend uprated springs, they make the ride bone jarringly uncomfortable, uprated shocks are generally good though, & adjustable ones mean you can get the handling perfect, but they usually cost as much as a reasonable standard Uno! (4-500)

I've not tried polybushes, I just change my wishbones & rear shock mounts every 3-4 years, they can be had for around 40 on ebay.

I live somewhere where there are a lot of speed humps, so I don't lower my cars either.
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Currently got.. 1981 Fiat 127 Super, 89 Panda 750L, 89 Uno 70SX (1.5), 90 Uno 60S, 93 Uno 45, 99 Sei Sporting, 2000 Sei Sporting, 96 Jaguar X300 Manual, 99 Jaguar XJR V8, 01 Porsche Boxster, 1989 Escort Mk4 Ghia, 2012 electric motorbike.. The 1990 Uno is the most fun!

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Old 31-10-2017   #18
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Re: Improving cornering

Thanks, good to hear from people with experience with the car.

I've gone with the 155 tyres, on the standard rim, so we'll see how she behaves. I'm not expecting miracles, but an improvement over the standard 135 would be welcome.

I'll keep the Alfa rims (mine are the later 145 rims with a slightly different offset), maybe try them another year, though a 200 investment in tyres is an awful lot for just trying.

Will lookout for a strut brace. My shell is sound, no rust.
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Old 31-10-2017   #19
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Re: Improving cornering

Fair enough, although a 155 will be an improvement, especially if you go for a highy rated tyre, I`d still say go for a 165 or 175. Auto Express have some good older tyre tests online which`ll give you an idea.

My Alfa rims are 5 1/2x14 et 39 if it helps.
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Currently got.. 1981 Fiat 127 Super, 89 Panda 750L, 89 Uno 70SX (1.5), 90 Uno 60S, 93 Uno 45, 99 Sei Sporting, 2000 Sei Sporting, 96 Jaguar X300 Manual, 99 Jaguar XJR V8, 01 Porsche Boxster, 1989 Escort Mk4 Ghia, 2012 electric motorbike.. The 1990 Uno is the most fun!

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Old 01-11-2017   #20
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Re: Improving cornering

Quote Originally Posted by a73uk View Post
I wouldn't recommend 185/60x14 without fitting spacers/having deeper rims, as they foul the inner wings (rubbing approaching full lock at the front, & rubbing during hard cornering at the rear).
Pirelli P6 185/60 R13 80H were absolutely fine. 185/60x14 you mention would be completely wrong as in going to 14 inch from 13 inch would require a profile drop. Not researched but 185/50 or 185/55 on a 14 inch rim would be more appropriate.
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Old 01-11-2017   #21
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Re: Improving cornering

Quote Originally Posted by s130 View Post
Pirelli P6 185/60 R13 80H were absolutely fine. 185/60x14 you mention would be completely wrong as in going to 14 inch from 13 inch would require a profile drop. Not researched but 185/50 or 185/55 on a 14 inch rim would be more appropriate.
For what reason would it need a profile drop? Gearing? I`ve not had a problem (I was initially on 185/60 14`s, the difference in acceleration wasnt noticeable, the rubbing was however).

I`ve not tried 185/60 13`s so cant comment, the widest I`ve gone on standard steels was 175/60 13`s.
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Old 02-11-2017   #22
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Re: Improving cornering

Based on a standard 135/80 R13 (1714mm) the 185/60 R14 (1815mm) will read 6% lower in MPH. 185/60 R13 (1733mm) will read 1% lower in MPH. I also used 185/55 R13 (1677) reading 2% high. However these tyres were (back then) much more expensive and harder to come by. Bearing in mind the number of tyres I got through 185/60 R13s were the overall best choice over a number of factors.

Besides speedo readings the problem/challenge with the Uno (non turbo) is torque and acceleration. Going 6% longer on rolling distance is a hard pull for the engine. Shorter is much better. The Uno engine is a good little revving engine so higher overall RPM/over revving is not an issue.
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Old 02-11-2017   #23
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Re: Improving cornering

Quote Originally Posted by s130 View Post
Based on a standard 135/80 R13 (1714mm) the 185/60 R14 (1815mm) will read 6% lower in MPH. 185/60 R13 (1733mm) will read 1% lower in MPH. I also used 185/55 R13 (1677) reading 2% high. However these tyres were (back then) much more expensive and harder to come by. Bearing in mind the number of tyres I got through 185/60 R13s were the overall best choice over a number of factors.

Besides speedo readings the problem/challenge with the Uno (non turbo) is torque and acceleration. Going 6% longer on rolling distance is a hard pull for the engine. Shorter is much better. The Uno engine is a good little revving engine so higher overall RPM/over revving is not an issue.
As I said, 175/65 14`s (1778mm) give a virtually perfect speedo reading (as checked with GPS), under reading by 2mph @ 70, which is pretty much bob-on, & as I said, I have no problems with gearing or a noticeable loss of acceleration.

I do have a set of 13" Uno Turbo Mk2 alloys waiting for me to referb them, I might try 185/60 13`s on them when I do, just to see.
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Old 02-11-2017   #24
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Re: Improving cornering

175/65 R14 rolling is 1831mm which is 6.8% long. My Uno speedo was reading a little over 8% high against GPS. Also Fiat speedos of that era read high. As you have found the 175/65 R14s have brought your speedo from reading high to around the true value. For my Uno they would have brought mine down from 8% high to about 1% high.

The Unos in the Fiat Racing Racing & Italian Intermarque Challenge racing series used to run 45 or less profiles on 13 inch rims to give them better pick-up and acceleration PLUS an overall lower centre of gravity. The Uno is naturally a narrow track top heavy car with all those large windows so a lot of effort and experimenting was done to improve this.


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