Is it recommended to put more air in the tyres when going on track than your typical road pressure?? How much?

15" proxies if that makes any odds?

 

I always put more air in.

 

Not if you want to understeer off onto the beach no.

Depends on the weather - run around 5psi less than you would on the road and see how it feels

 

How about 4 degrees c, fookin freezin! But dry!

TBH I'm not 100% sure what the correct pressure for the road is.

Any reccomendations on a starting pressure mate?

 

putting more air in your tyres when on a track is the biggest load of bollox ive ever heard and surprising enough a lot of people do it , its just an instant recipe to ruin the handling of your car not to mention fookiing your tyres instantly

 

Thank you fellow novice driver

Brasso - you should be looking at different pressures front and rear if its the car in your sig

 

Harder at the rear I pressume??

Give a genuine novice a clue!

 

I seriously hope you either walk or get the bus to work on Monday

 

Always run 22 and 25 in mine pal.

 

Cold or hot Tim ?

 

cold tony

 

On Tiffs pug "we" (LOL) run 15 rear and 16 front cold but they're slicks.

No help at all I am afraid.

 

Tim Our new expert Brasso will confirm thats fine shortly

 

Jake ..... you need serious help

Could lose about 10 seconds off his time then with better pressures

 

dont forget cold to hot pressures = 6-7 psi.


i run about 22-25 cold pressures = 29-33psi once hot. matters on tarmac heat, and wot corner of the car.

but i'm only just starting on the trackday seen, and learnin as i go.

 

What Jake was ment to say was

We run 15 front and 16 rear......COLD on SLICKS

After 2 laps of warming up they are reading 24 front and 25 rear HOT

All ok'd by Marco

Good enough forCONSTANT 1.29's at Donno

 

Then you need a new gague Mark

From 15 to 24 in two laps on Michelin S9B's would be nigh on impossible mate, I couldn't even do that on Michelin 00's

You could be in the 20's with proper help

 

well just think of the improvements if you actually got it right then !!

there are a lot of general rules that dont apply to everyone, but there are certain rules that do, hot air expands is one of them - hence why i dont put 40psi in a set of slicks

ffs even in the middle of december on a loose forrest track i can gain 8psi over 20 miles

 

 

alot of the pressure depends on the weather, the time out on a stage, the tyre compund, the cars weight

 

I did say that DIPPY LOL.


But I have to agree.. when we had em at high pressures the tryes blistered.

Marco had a little input and they're ace now.

Jake

 

As Jake said

We were running a little too much pressure at on point and it was rippling the outer edge of the tyre after a good few laps.

Marco gave us some advive and now it is superb

If you think it is too high a pressure........What would you say to run??

 

Cirqiut organisers often say to put more air in the tyres as it causes less tyre wear as there is less tyre on the track.......

but as been said above this will normally only cause problems with handling

I run my nova 5 psi lower on three

Depending on which way the track runs I have less in one rear tyre by 2psi so at Combe the near side rear has less the same for donnington

This took ages to work out adjusting tyre pressures

when cold I run 25 psi and when hot they are 29/30 psi

Also I have seen tyres come off the rim where lowering tyre pressures too much so be warned

Dont forget though to always use a warming up lap....I know alot of crazy mofo's go out on cold tyres and come off or spin on the first corner due to cold tyres especially using slicks

Hope this helps

Si

 

Good topic for a change Good idea also to run a little less in the nearside at donno also.

 

Slicks do that Mark when overheated, the tread should also roll up and blister slightly when operating correctly thats why we have to them buffed every so often.

See the answer below yours from d7ake for advice that is spot on

24-25 cold - do 1 or 2 warm up laps, 4 or 5 hot laps then come in and get them checked and adjusted to around 28 front and 26 rear.

Many people often forget to take a tyre pressure gague with them to track days, its one of the most important things to take IMHO

 

Hey seeing as you guys know abut slicks what does S400 mean on the side of my slicks? I run about 17psi about. And sometimes i can get dribbles all th way ove the tyre! and also what should i be running in wets?

 

Got a pressure gauge

When it started to ripple you could feel it through the steering...you say thats right??????

After it did that Marco said to drop it a few psi. after that it took 15 laps of hard hammer and didnt ripple at all

 

S400 is a Michelin slick
P400 is the equivalent compound rain tyre.

What sort of laps do you do on them, and what length of time, how big is the circuit etc.

You should be coming off circuit with them in the mid 20's. You will need to find out by practicing what sort of temperature you need to start off cold to achieve that figure

 

Tony

Cheers for the advice pal

Basically this is what we have managed to find out.

We have come to the conclusion that we put 15psi in the front and 16 in the rear from cold...

Once i got out i do 2 laps of Donno fairly easy to warm them up and after them few laps i can then get VERY good grip....

Now when i came in after a good few hot laps we checked the pressures straight away and found tham to be 25 front and 24 rear.......Bearing in mind this is driving to where the pits are now at Donno (They are outside the pit-stop cafe until the new ones are ready) So i guess they will of cooled down from about 28 front and 27 rear on track.

TOP TOPIC TOO

 

and were they then in the mid to high 20's when running right ?

Buying 2nd hand tyres is like a lottery, you never know how they have been treated before you.

No probs - but I have never ever seen a slick go from 15 to 28 in all the years I have been running them. But if it works for you then

I sent all this info in a PM to Brasso yesterday as I wasn't expecting the thread to last as long as this, and its only really applicable to smaller FWD cars. 4x4 cars and bigger saloon cars will need to run a slightly different pressure set-up. Knowing as some people read everything and take it as gospel to be the same for all cars / vehicles I sent the info in a PM.

 

Yes Tony

If we go out with them at 16F and 15R.....by the time they are hot they are mid-high 20's

I just have to do a few laps to get the heat in them

 

i dont think ive ever dropped to less than 20psi on any surface or any rally, tbh, and dont forget were talking a relatively large torque 2wd , the back tyres take a fair bit of pain, the only time i will run pressures as low as 20 or maybe a psi or so less is if the track/surface temp is very cold, and ive even been known to put cuts in the tyre to aid fast warm up


im glad we can actually have a decent discussion about something as well, makes a big change to 'ive drunk 52 stella's and my girlfriend left me ! "

 

 

Good topic , huge one tho ! you guys who do the occasional trackday in your roadcar will be taking a relatively soft car onto a race track , tyres , slicks tyres anyway for the purpose of this dicsussion have an optimum window of temperature to work in , the softer the car the quicker the tyre will warm up and the quicker you'll kill it by rolling onto the outer face .
If youre looking for the optimum then you wont find it for very long unless your car is set up to maximise the tyres potential like a racing car does .
As a rule tho , the ex BTCC tyres i supply to many board members , operate best at 22-24 cold and should optimise around 30-32 psi after work .
also should be noted , if you drive like a fkin loon , you'll lunch the tyres before you break into a smile , go easy and enjoy them .

 

Hi, what about Avon slicks.
I have currently 8x17 ET15 MO,s 9/23.3 x 17 avon diagonal. This year 2006, slightly bigger 230/620 x 17 radial.
Air temp 30 deg, track temp 35 - 40 deg.
Race distance between 2km and 4km.
Tyres checked when warm, not hot. (2-3 mins after run). In fact due to short distance the tyre temp does not get hot, probably not to full working temps during some runs.
Front 28.5psi
Rear 27.5psi.

Could this be contributing to my slight understeer?


always looking for advice from others with more experience.

cheers.

 

Avons generally have softer (less stiff) sidewalls and like to be run with a slightly higher pressure.

What vehicle is it ?

 

if your not getting enough heat into your tyres then ultimatley your not getting the grip back from them, i dont know too much about avons as ive never run them but they are probably not suitable for your application if they are not getting hot enough , if your actually racing with them take a temp monitor, after your race distance have a measure across the tyres in three equal spacings, in the middle then one each side, record the temps then do a bit of analysis as to what the temps are, to make sure your 'footprint' is firmly on the ground you should see equal temps across each tyre, thats not all tyres equal, but all three readings

god im waffling like BAL

but seriously if thats your pressures after a race then you should have built up enough heat by then, if the footprint is ok, the temps are ok then maybe your compound needs to be softer ?

 

Hi

Escort Cosworth, small Turbo, 1190-1210Kg. depends on how much fuel is in tank.
Stripped with single seat.
Leda coilovers all round.

 

track racing is far from my thing tbh , far too much grip to be had

so i'll leave the rest of the info to the experts

 

Hi Markk

Its probably worth it to buy the temp gauge, I saw some other guy last year with a laser device.

I believed the Avon to be a good choice as many of the current front runners are on Avons. Some are on Dunlops, with very few on other makes.

As for compounds, in your opinion who has the widest range?

cheers. Kenny