A race bmw 316, m10, s14, m20, turbo, na, its been the lot!

[Graham]

Re: A racing bmw 316, hopefully the worlds most powerfull Atmo M10

tyre temps show camber etc to be correct, pressure, well we did drop it a bit but we were only using 22psi cold in the first place, the thing is we dont need a bit more heat we need DOUBLE the heat

[tom burgess]

Re: A racing bmw 316, hopefully the worlds most powerfull Atmo M10

Well i was impressed at how well the car went Graham.considering how little power in comparison to last year you had the car seemed to pull up the hill nicely.Glad everything went fine and nothing broke

[robt100]

Re: A racing bmw 316, hopefully the worlds most powerfull Atmo M10

How about a bit of toe in to keep the friction up a bit? Though with the "lack" of power you have compared to before you need the least rolling resistance you can get!
And if tyre temps arent good the camber cant be right

[Retromotorsport]

Re: A racing bmw 316, hopefully the worlds most powerfull Atmo M10

I would toe it more Graham, at least for qualifying, its a free test.. and at somewhere twisty could pay off.. long circuits drop the toe back.

which end is loose... front or rear or is it a balanced lack of grip.

Also, how tight is the diff, if its understeering on a tight diff can you wind some more castor in..

[Dave]

Re: A racing bmw 316, hopefully the worlds most powerfull Atmo M10

Well done for getting it finished on time, managing 3rd in class on what is essentially a new car, big well done for not having anything break or fall off and also for getting it in amongst the racing. Sounds like nearly everything has gone to plan.

[Graham]

Re: A racing bmw 316, hopefully the worlds most powerfull Atmo M10

the car already has 2mm toe in on the front and 3-4 on the rear, it was a fairly neutral lack of grip, it would turn in but run wide if i pushed really hard, and was prone to wagging the tail on turn in, powering out of corners wasnt an issue although that sometimes pushed me wide but that was a lack of front end grip rather than the diff working, the diff is set up with quite a low lock, that stays as it is because i have all the traction i need and it doesnt steer the car for me,

the problem is literally the rubber compound is too hard, dunlop recons i need to come down two compounds softer, the tyres being a massive 250 wide wont help either,

basically once im a few laps in thats it as far as lap times go, they just dont heat up, after my last race we drove straight back to the paddock and the tyre temps were

n/s/f 40 39 39 o/s/f 39 36 35

n/s/r 51 50 50 o/s/r 50 50 50

its actually quite good to drive no real vices, and neutral, although both ends will slide its quite catchable just ultimatly a bit slow

[Retromotorsport]

Re: A racing bmw 316, hopefully the worlds most powerfull Atmo M10

Yep..toe the front nexy qualifying .. tyre pressures are spot on, and a teeny weeny camber change on the o/s/f

[robt100]

Re: A racing bmw 316, hopefully the worlds most powerfull Atmo M10

Is it not worth possibly sacrificing a bit of that linear temperature to get a bit more heat on the main contact point? As I would have thought you'd want more inner temp, as its on that inner edge more, if its all equal it seems to suggest the tyres lean on the outside too much when cornering. As for the cornering, seems the front dampers might need a small tweak stiffening and a softer front ARB if the understeer gets too much. But then again I may just be spouting a loud of rubbish.

[Graham]

Re: A racing bmw 316, hopefully the worlds most powerfull Atmo M10

i hear what your all saying and its all vaild if the tyres were running a bit cool, but they need to be way way hotter, lets not forget the chassis is right and does work, only last year i smashed 4 seconds of a lap record, which i already held with a class winning pace,

what im going to do first if i cant find a way to come up with more suitable tyres is to try some downforce, mechanically forcing the tyres harder into the tarmac should give more grip and more grip will heat the tyres more, i suspect a nice big front splitter will also help by keeping the front tyres out the airstream which can only help

[team_zi]

Re: A racing bmw 316, hopefully the worlds most powerfull Atmo M10

keeping the front tyres out the airstream which can only help

Interesting concept Graham. Not sure if the air passing over the front tyres makes any difference, but it certainly sounds reasonable. Are there any CFD experts on here?

[Ken Welch]

Re: A racing bmw 316, hopefully the worlds most powerfull Atmo M10

Whilst viewing your car from every angle possible on Sunday my opinion was that it seemed quite high off the ground. Would smaller diameter rims with slightly narrower tyres improve things?. Higher wheel rpm for the given speed and a smaller contact patch = Hotter tires and lower ride height. Just a thought.

[david_white]

Re: A racing bmw 316, hopefully the worlds most powerfull Atmo M10

I think the cost of the 10x18's and tyres means they have to work for now Ken, but yes ultimately you're probably spot on.

Apart from being a little high Graham can't you get the bonnet to shut properly now, might reduce drag a little

I'm sure with a front splitter and a bit more angle of attack on the rear wing grip should improve too

[Graham]

Re: A racing bmw 316, hopefully the worlds most powerfull Atmo M10

yes the car is a tad high on 18" wheels, but my other wheels which currently have wets on them are almost as tall 17's, the only other wheels i have are 15's which are too narrow really and i cant get suitable tyres. the smallest wheel i can get decent tyres to suit it are 16 inch, but then i've got to buy new wheels and tyres

the overall ride height could come down a fraction as its gone up a little with the loss of turbo gubbins.

the bonnect could come down a bit it i modified it some more, but i dont see the point, if anything its angle is effecively reducing the height of the windscreen,

the easy way to fix the problem is for someone to give me £1000 and i'll buy some suitable tyres!

[mk2stu]

Re: A racing bmw 316, hopefully the worlds most powerfull Atmo M10

well done m8 im glad the new engine did well

think the earo work would theoretically work would the weight penalty balance out the extra grip/heat?

[Graham]

Re: A racing bmw 316, hopefully the worlds most powerfull Atmo M10

the weight penalty would be negligable and i doubt it would have any effect anyway, i practised with quite a bit of fuel in the tank and with a fairly heavy passenger seat in the car, but we took the seat ourt and raced with a low fuel level and best race lap times were fractionally slower, 2 hundreths to be exact