Dear All,

I have Uno 45, i will fit a Turbo engine.
Expected 170-200hp

maximum speed desired , 200 - 240 K/h

What i need to change in suspension to handle this performance and not to loose ride quality??

1) Springs / Absorbers?
2) anti-roll bar.
3) Alloys / Tires.

Thanks for help.

Mostafa

Hello there and welcome....

If you want to put the turbo running gear into your 45s, then you will need to change every thing if you want to stop,and corner it...

Brakes will need to be changed, put the turbo rear disc's on the back
Suspension front and rear with the roll bars
The turbo has a quicker steering rack
And also all the engine wiring loom and mounts,gearbox. etc etc

The best bet is to maybe buy a doggy turbo and swap all the parts one for one untill you have built a turbo. The 45s is the same shell and all the holes will be in the right place you just got to swap every thing over to make a good job, after all you want to be able to stop the car and go round corners..

Unless you have alot of time and money its better to just buy a turbo....
Post some pics up of your car please...

I have full front half of a Punto GT3.
What is interchangable with my Uno45 from brakes and suspension??

I am also concedering -60 suspension kit, but i have doubts about what best Alloy/tire size to use with them. and if it better to get -40/60 instead.

I also asking , if i could do 240k/h saftly with such suspension??
Thank for your help.

The only thing that will go into a Uno as far as I know from a Punto GT is the engine, and even then you need the mounts and exhausts from a non FIRE ohc Uno (1116cc, 1299/ 1301cc/ 1398cc). The FIRE engine is totally different.

The same applies to the suspension. The Punto is a totally different car, and about the only things that will swap are the wheels. Not sure about the brakes, I think they can be adapted but only the fronts.

You'd be far better off looking for a rusted out turbo and swapping over EVERYTHING that is specific to the turbo models as Rob said. Just fitting the engine alone will be lethal :dead:

Regards to coping with 240kph, the turbo boys running uprated engines and suspension will have to answer that as I only have a lowly 45S!

Ive done a 60S to Turbo conversion

Suspension
The only uprated suspension upgrade are lowing kits (Springs and dampers) but AVO do a front only coilover kit for them

The Turbos and SX models use a front anti-roll bar, youll need the crossmember "clamping" brackets to mount the anti-roll bar

240Km/h = 149 mph

A member of Turbo Collecitve (In google search) has a very fast MK1 UT and told me he hit 150mph (241 km/h) on a 60mm lowing kit with standard Anti-roll bar

I am pretty sure the front end of the MK1 Punto is the same as an uno

Biz said:

The Turbos and SX models use a front anti-roll bar, youll need the crossmember "clamping" brackets to mount the anti-roll bar

Click to expand...

Only mk2 SX's had an anti-roll bar fitted as standard. The mk1 doesn't, as I tried to find one for my 45S and can confirm that a mk1 70SX does not come with one fitted. Only the mk1 turbos had a standard anti-roll bar.

I was hoping I'd get one when my and Jai broke up a 1988 70SX, but it didn't have one

Biz is right that you need the turbo or mk2 SX suspension arm clamp plates to fit the roll bar. I found this out from bitter experience, as it is not possible to fit the roll bar otherwise.

I can also safely say that fitting the roll bar transformed the handling of my 45S! No longer did it pitch and roll in corners, but stayed nice and flat. My car is running standard suspension, so I also get an excellent ride quality.

Be warned that after fitting an anti-roll bar you'll be able to push your Uno into corners MUCH harder, and the next upgrade has to be better tyres...

ra_XOr said:

maximum speed desired , 200 - 240 K/h

What i need to change in suspension to handle this performance and not to loose ride quality??

Click to expand...

Chas, Biz, Rob all make equally good points.

I have a bigger concern with your target - it's unrealistic You WILL lose ride quality in some way. The best ride quality to be had in an Uno is probably in an original 70S (the kind with the sagging seats and the worn-out shock absorbers). Technically, it is because along with soft springing, you need a high sprung/unsprung weight ratio. If you don't know what that is, I suggest you are not well-placed to make modifications in the interests of ride quality

If you want good ride quality and 200-240km/h, best value and best ride quality would be to buy an Alfa Romeo 164 (bargain prices these days), or perhaps a Stilo Abarth like mine (about ten times more expensive) Early 90s BMW 7-series or Toyota Soarer (Lexus V8 coupe) would also be good choices for performance with ride quality.

Incidentally a bare-shell rebuild Dunc-style probably costs more than a Stilo Abarth. Maybe Dunc would like to comment on ride quality?

So, going for performance, you require reduced body roll and therefore less weight transfer in braking and cornering. You get this with a lowered centre of gravity (at least 40mm drop still looks 'normal' to most people) and the fitting of an anti-roll bar. The rear beam can be stiffened up for an anti-roll effect. You should probably then use 13" or 14" wheels - no larger - since the larger wheels don't add any extra grip, but they do add unsprung weight (oops, almost returned to your unrealistic target there )

Generally, the less compliance you have, the better will be your grip on a smooth surface - but the loss of grip at the limits will be more sudden and harder to control - and on any rough surfaces you will be worse off than with standard suspension.

Also, more recent cars achieve some of their stability through 'strange' suspension geometry (lots of caster, negative offset) which would give rise to awkward, heavy steering. This of course is remedied by variable-assistance from hydraulic or electric power-assisted steering. The Uno does not have power-assisted steering at all, so its steering is always going to be more lively - and you are going to need nerves of steel at 240km/h on a less than perfect road.

You must uprate the brakes to Turbo spec, otherwise you may find yourself in a dreadful fade situation: brakes literally stop working when they are overloaded. Remember that kinetic energy increases as a square of the velocity.

You probably wanted a more direct answer, so here it is: adjustable coilovers are the way to go. Talk to Dunc You have to keep your spring rates matched to your shock absorbers: too little damping and the stiff springs will bounce, too much damping and there won't be any compliance at all (jarring). Also you must match the rates front-to-rear, otherwise there will be pitching/rocking during braking and acceleration.


Cheers,
-Alex