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

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

    its been a while since ive touched the car, but the racing season is coming, so had to pull my finger out, and get some upgrades happening.

    i didnt get a lot of seat time last year but its clear on the right day at the right circuit, the combination of me and the car have the pace to run well inside the top ten overall, which means ive been giving thought as to how to get on the podium.

    i cant easily find more power, but i know from chasing Porsches and lotus sunbeams around various tracks what i need most is a car which will carry more speed in the tighter corners, which means taking weight out the car, and more importantly off the front. the trouble is most of my attempts to lighten the car whilst being successful are all taking weight off the back so doing nothing to help the car turn in better, and not something i can fix by just drilling a few more holes, so ive splashed a bit of cash. ive ordered a polycarbonate windscreen, and some alloy front arms.



    so these have been changed for, these....




    the alloy arms being half the weight of the steel ones

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  3. #2122
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    Re: A race bmw 316, m10, s14, m20, turbo, na, its been the lot!

    i did another couple jobs, one was to change the plastic wheel spigots for alloy ones, as i keep melting the plastic ones, even when its wet





    also loctited the wheel studs in, they have a habit of unscrewing when the wheel nuts are undone, its not actually an issue they dont need to be tight in the hubs, i usually just twiddle them back in, but it did dawn on me that i often have pit crew who may not be switched on with regards to loose studs, and therefore possibility send me out on track in a car with studs barely screwed in





    i didnt get any pictures, but i did a few other bits to the car, i found a few bits of weight to take out, although as usual they all took weight off the back of the car, i bolted the rear bumper directly to the body without what was left of its original attachments, that saved a couple more kilos and makes it less likely the bumper skin will fall or hang half off given a tap from the rear. i also tweeked the trailing arm mounts on the rear beam, something ive been wanting to do to try and get some of the excess camber out of the rear wheels, turned out pretty successful too, as i managed to drop an inch out the rear ride height and still end up with a degree less camber, a real result as normally that would of added a degree. i was hoping that dropping the rear ride height would help shift the weight bias rearward, it didnt as such, because the front/rear bias remained same as last time i corner weighted it, but thats actually a result, because other than the alloy front arms, all the weight ive taken out the car has come out the rear half, so its still 55/45




    its always slightly tricky working out what the changes have done weight wise, simply because always has a different fuel level, that 938 at the last weighin was with around 25 litres of fuel on board, so the car with a low fuel load is getting closer to my goal of 900kgs, not bad for a car with an iron straight six in it, and the only non steel body panel is a grp bonnet,
    Last edited by Graham; 18-01-2020 at 21:27.

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

    I don't want to sound like granny and 'sucking eggs' but have you a 'race tank' or std BMW? Battery in the boot, any fluid containers (screen wash, overflow tanks etc) into the boot? Whilst you needed lights in your last outing - do you need lights by regulation? - few kg's there? Shame you can't swap out the big bimmer gearbox for a transaxle box - that'd be a nice weight change! Any Bimmer alloy engines worth a swap?

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

    Quote Originally Posted by katana View Post
    I don't want to sound like granny and 'sucking eggs' but have you a 'race tank' or std BMW? Battery in the boot, any fluid containers (screen wash, overflow tanks etc) into the boot? Whilst you needed lights in your last outing - do you need lights by regulation? - few kg's there? Shame you can't swap out the big bimmer gearbox for a transaxle box - that'd be a nice weight change! Any Bimmer alloy engines worth a swap?
    thanks for the suggestions. let me see.

    screen wash bottle and anything to do with washers long gone , including any wiring, car has bare minimum wiring to make it work.
    yes i have to have lights, id even gone as far as taking redundant bulbs out the clusters.

    there are no alloy engines i can fit and still have a bodyshell/period correct engine. the only engine i could fit which would not cost me a bunch of power and improve weight distribution is an S14, the 4cyl m3 engine, yes id love another one, but these days they are starting to make BDA's look affordable, not only would i have to change the engine but also the gearbox, i could end up spending 30k for a small improvement in weight distribution. it would be similar to swapping a pinto for an all alloy BDG, great idea, but if i had that sort of money i would be racing something else!

    fuel tank is an alloy escort one in the boot, with fuel pumps etc in spare wheel well.

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

    Ah well - looks like all bases covered, you have a dinosaur with a tail happy, no grip rear end! Short of getting a 911, I can see any other changes you could make LOL!

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

    Quote Originally Posted by katana View Post
    Ah well - looks like all bases covered, you have a dinosaur with a tail happy, no grip rear end! Short of getting a 911, I can see any other changes you could make LOL!

    And a 911's not tail happy !!! Really...!

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

    Quote Originally Posted by katana View Post
    Ah well - looks like all bases covered, you have a dinosaur with a tail happy, no grip rear end! Short of getting a 911, I can see any other changes you could make LOL!
    TBH its not that tail happy given that it has 220lbft and 285bhp the main reason im trying to shift weight rearwards is to try and stop it understeering going into tight corners

    the latest effort, ive moved the both battery and fire extinguisher back about two foot each



    i also changed the fuel return pipe, the new one is slightly lighter but it wasnt for that reason, although the braided goodridge hose doesnt leak fuel it does leak fuel vapour, i heard numerous times they ooze vapour but never experienced it myself before.



    a cabin stinking of fuel isnt an ideal way to start a race, and probably isnt helping with regards to me getting car sick!
    Last edited by Graham; 19-01-2020 at 23:57.

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