Purely out of interest, what's the widest wheel anyone's running on an Escort Cosworth on here?

And what are the pros and cons of going super-wide?

 

Would think it would be 9" on the front and 10" on the back, pros would be grip.

 

Guido managed to fit 10" front and rear on his.

 

cons would be them not fitting i assume?

 

But did he use tyres of the correct fitment or did he stretch them?

 

I would have to look, as I can't remember what size he was running .

 

245/35x18s all round, so as you expected Martin, the "Euro" look .

 

Cool, cheers!

Would 10" fronts not have an adverse effect on steering though?

 

Martoon, dosn't your 10" rear conversion use 275's? I am quite tempted by a nice big set of comps .... or have you got to pull the arches for them to fit, and I am I right in thinking the fronts are 9" ? ...

Good topic, I was only thinking about this earlier

 

I looked at a blue one years ago before I got mine, it had 10x18" all round. Dont remember the tyre size though.

 

iirc martin used 8 1/2 on front of his i think one reason being the brake clearance issue ???

and i think you need the arches pulling too !

 

you will reduce turning circle with wider fronts, id expect a bit more tramlining too

 

With 8's on the front and 10's on the rear what size tyres do you need to run?

 

What would people recommend on a highly-tuned Escort Cosworth or similarly-powered 4wd car then?

Assuming fitment isn't a problem, I would assume everyone would say go with 10's at the rear? But as for the front, what's best? 8's? 9's? 10's?

 

Depends what you consider to be high power? I run 500bhp and 8˝s all round (no wheel arch mods required) with 245/35x18s. Job done.

Martin runs big fat tyres on the back of his, as he has 700bhp and the ability to channel 100% of the power to the rear tyres. I personally don't think you need tyres as wide as this, unless you plan the same.

 

Wider tyres on the rear sound like wheel diamater issue to me as well as good way to promote understeer.

Other cars of similar performance work nicely with 245 18's, you would need massive power to need to go even wider I think. Our Subaru race car runs 24/64/18 slicks and it doesn't have any traction issues with 530bhp@1070kg (it overheats R888's very quickly though when street legal tyre is required).

 

I'm talking IRO 600BHP with a split of upto 70/30 in favour of the rear. I think I have more arch space to play with than an Escort Cosworth though.

Any pics/spec lists of said Subaru?

 

Very few cars have the ability to adjust the split, so what car are you thinking of ?

 

i don't want to mess up the thread. It's the Autosportif endurace racing car, we bought it couple of weeks ago and brought to Poland.

The engine is massively complicated thing, altough it runs very simple turbo.

As it looks now: http://portal.4turbo.pl/image.php/4611/s_full

 

Was this the ex-Tein Time Attack car?

 

Yes they used it for Time Attack, although they had some problems with making it peform on R888's, it run with allthe endurance racing stuff in it including the 120litre tank. I wrote you about testing it at Brunters couple of weeks ago.

 

I thought certain Imprezas (not sure which models, but I was thinking of at least one of the 2 door models, Type-R/RA/22B) was biased quite a bit to the rear.

Nice looking Subaru there too

 

the DCCD equipped models have 35/65 or 41/59 torque split, but they do have mechanical centre differential and electromagnetically adjustable pre-load on clutch type LSD. So there is no way to adjust split itself, only the LSD action is adjustable. It may seem to the driver that more power is fed to the rear, but it is only less locking action if the switch is moved towards "open".

Adjustable split is on cars without mechanical centre diff that have RWD (or FWD) drive train with other axle conncted through some kind of multiplate cluctch which can be adjusted. this is the case with the GT-R's, 996+ Porsche turbo and C4, and some VAG transfverse engine/haldex equipped cars (if you fit aftermarket controller).

In fact it is common missconception that active centre differentials of Subaru, Mitsubishi or the world rally cars let you adjust torque split which is plainly not the case.

 

Nice summary, thanks for that

 

I am always happy to help with Subaru or Mitsubishi as I need a lot of help with Ford things myself

 

How are you on Fords with Subaru engines and running gear?

 

I am on managment of company that does everything Mitsubishi Evo and Subaru from building rallycars, through mapping them to simple servicing of road cars. So I know a bit or I know who to ask. Ford Cosworth stuff though is extremely exotic here in Poland so I have trouble with just about everything that seems common knowledge in the UK even for people who normally don't deal with Fords.
If you need to know something avout Subaru running gear or other mechanical componentsa I should be able to help. I know some of the best people who work on those cars in the UK as well

 

PM on its way then, lol, so this doesn't go any further off topic!

 

the down side, if you were to run 9" comps on the front is the brake clearances, kind of why some go for 8.5 fronts, ive recently found this issue and its taken Martoon a hell of a lot of work to be able to make brakes of a decent size to fit.

i run 9" all round on R888 245/40/18's.

Mad Yum has 10" rears and never had big issues with clearances, but has now had the lower rear lips flared to make them slightly more accomodating - and hes running 8.5's up front.


another pic of Guido's, the tyres are stretched, and i never realised they were 10" as Mike has said.



and mine with the 9's.

 

All these cars must catch on wings on full compression though, don't they?

 

Azrael, Just a quick question please mate, Can u run say 10's on the rear and 8 or 8.5 on the front of a subaru impreza? its the classic shape, i was told that you carnt because of the 4 wheel drive???


Thanks mate


Sunny

 

Well, if you can run them on a 4wd Escort Cosworth, I don't see what the diffrence is going to be?! (In mechanical terms)

 

1. you would need it widebodied....a lot As 7,5 is a problem really on standard car. In fact I sitll have nightmares concerning finding wheel/tyre combination that would fit our show-car and not catch somewhere

2. You need to have identical overal wheel diameter front and rear. The tolerance is about 2 percent, which is about the difference betwween partially worn and new tyre. If you can find different size tyres that will have the same overal diameter then you are OK to go theoretically although I wouldn't see any sense of it. On Imprezas you generally tend to have problems with understeer and front tyre wear so why fit bigger tyres on the rear?

 

In mechanical terms there is none. The working principle on both drive systems is identical.

 

I take that as a no then lol Thanks for that mate, my mates got a nice set of splits there 10's adn 8.5's and wanted them for my mota, looks like i gota find a set of rotas or some thing, just wanted some thing out side the norm..


Thanks tho mate.

 

you can get 245/35/18s on an 8 inch rim :S so thats a 2 inch stretch with zero performance gain, If I were to go to the throuble to put 10 inch rimson my car they'd have the widest tyres possible!

Dan

 

Friends don't let let friends roll on Rotas. Don't do that, they are very bad products, even though they are pretty.

 

Wolf-Ford did back in the old days 9x18, remember they were genuine Ford + made especially for Walter Wolf Racing, i would like to see a escort cos with the 9x18 fitted.i have seen some for sale and they were very expensive

 

EDIT....mine are 8x18...would love to see a set of 9 inch ones

Cheers
Dan

 

Kelv your car is looking stunnig , glad you went for the 40 profile rather than 35's gives the car a much harder stance.