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

  1. #2081
    Spanner Monkey jcccruz's Avatar

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

    Graham the original spark plug cables of the E30 have a resistence of 6k ohm maybe that is interfering with the ECU at high rpm. I did have the opposite problem in my BMW E21 when I swapped the original spark cables for one custom made just to find out it didn’t work without the resistors.

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    I support TS Turbosport Subscriber rallyrob's Avatar

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

    What grade bolts have you used round those discs and bells please, 8.8 or 10.9's? Look like copper locking nuts, like manifold nuts too?

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

    Quote Originally Posted by jcccruz View Post
    Graham the original spark plug cables of the E30 have a resistence of 6k ohm maybe that is interfering with the ECU at high rpm. I did have the opposite problem in my BMW E21 when I swapped the original spark cables for one custom made just to find out it didn’t work without the resistors.
    ive now changed leads, but it used to work on the old ones so why the sudden change?

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

    Quote Originally Posted by rallyrob View Post
    What grade bolts have you used round those discs and bells please, 8.8 or 10.9's? Look like copper locking nuts, like manifold nuts too?
    not sure, but 8.8s but would be good enough, yes they are manifold nuts, i wanted a lock nut but given teh disc glow red under race conditions i didnt think nyloc was a good idea

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    I support TS Turbosport Subscriber rallyrob's Avatar

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

    Quote Originally Posted by Graham View Post
    not sure, but 8.8s but would be good enough, yes they are manifold nuts, i wanted a lock nut but given teh disc glow red under race conditions i didnt think nyloc was a good idea
    Ok thanks, yea I get what you mean about the manifold nuts.

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

    i had a trip over to the rollers today, to check the engines health, mechanically its almost the same as it was when last run up, the only difference being ive fitted some slightly longer inlet trumpets, which it really liked, they have moved the torque up the rev range a bit, and it hangs on for longer which has added 16bhp, its now got 283 bhp, which is stunning for a bmw m20. we did also try some 102 octane fuel, that did make a bit more power but only a bit, another 2bhp to be exact, so i wont be buying any of that, that said the 102 did hang on longer, so if the engine were to rev to say 8500 i think the difference may of been more

    Last edited by Graham; 03-05-2019 at 17:54.

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

    Very respectable I guess the top end misfire is cured then?

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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
    Very respectable I guess the top end misfire is cured then?
    yes proper fixed, i was pretty certain as several times id tried it round the industrial estate, where i could run it into the limiter and hold it there. i did think it felt stronger than its ever done certainly the way it pulled right to the limiter, but i put that down to where i was drive.

    Doing the maths the extra power and cars diet has improved the power to weight ratio by 35bhp/tonne, no wonder it felt quick

    i struggled to remember what the final weight was but seeing as ive now found a pic i will leave it here for reference, hmm, the pic seems to of gone missing, anyway it weighs 938kg or 1028 with me in it
    Last edited by Graham; 05-05-2019 at 19:18.

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    Re: 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!



    i had another outing in the car a CSCC race at silverstone on the international circuit, i have raced at silverstone numerous times but never this configuration, so only 3 corners would be the same as i have previously driven ten years ago, so basically i didnt have a clue where i was going, never good, and im not great at learning new circuits at the best of times, let alone in a car i still havnt really got the hang of and isnt the same as when i last drove it!

    just to recap since i last drove it i re engineered the front discs so i could run the same 8x15 wheels and 225/45/15 tyres all round. as well as fitting a thicker front anti roll bar. my thinking being that on the 7x15 fronts 205/50/15's the car was ok, but had more understeer than i was happy with, for thruxton i tried some 215 tyres on the 7 inch rims the front just didnt feel nice, it seemed to have more grip but felt rather boat like and wallowed rather than changing direction nicely.

    going out on track i was going to be on the back foot, virtually all my competition had raced the circuit before and quite a few had tested the day before. as it was to be a 40min pit stop race with (for most) a driver change, i decided not to practice a pit stop (even if you dont change driver you have to pit and get out the car and back in again) so i hoped a long un-interrupted 30min qualifying session would get me reasonably well upto speed.

    other than some leg pulling as i was recognized scrutineering went without issue

    Exiting the pit lane with the rear end snaking in 3rd, i thought yeah this feels fast, but it didnt really once out on track though, with a power to weight ratio of getting on for 300bhp/tonne it should feel fast, in practice the power delivery is so flat and smooth and only needing to use 3,4,5th gears it just never feels fast out on track, doubts were dispelled when i caught up with a triple webered E type jag and breezed past it in a straight line. The extra grunt at the top of the rev range did make its presence felt though, as it meant i only needed 5th gear at the end of hanger straight, and 3rd worked right through the twisty bits, so not a lot of gearbox stirring needed i could concentrate on learning where i was going.

    despite the weight distribution changing for the worse and using old front tyres the front end changes worked well, the car was turning in well, in fact it was pretty neutral, the rear drifting a little if i turned in hard, the new stack dash did flag something up i would of missed before and that was oil surge going into the tightest slowest left hander, TBH i didnt worry me too much, i wasnt on the power when it came up and pressure was still in the low 20's. Unfortunately just as got the hang of whether i was going and starting to try and push, the Thruxton sickness reappeared. i tried to contain it for a lap or two but then pulled off. Thankfully i didnt actually puke this time, i now know for certain i am getting car sick, it only happens at circuits where there are a couple of tight right left direction changes close together.

    back in the pits, we just refueled, added half a litre more oil ( this was the first time i had run the car on the max, not a bit overfilled) dropped 1psi out the n/s/f tyre, and headed into town to find some travel sickness pills.

    i had qualified very much mid field, 18th out of 36, to be honest know it was the cars straight line speed that saved me from being at the back of the grid, i simply just didnt have enough track experience, but i figured out with others to chase down i would get quicker in the race.

    it was to be a standing start race and in the drivers briefing we were all warned that race control had lots of cameras and observers watching the start, any movement after the lights came on would result in a penalty. sitting on the start as the rest of the grid formed up behind me i felt the car was moving slightly, mindful of the drivers briefing and no handbrake i held the car on the foot brake and tried to hold the revs just over 3K, which i wasn't going very well, so i was concentrating on trying to get that right when the lights went out and everyone was off, the end result of that being the cars behind got the jump on me, i reacted with too many revs and lit the rear end up loosing a couple of spots in the process.

    at least i had a decent enough idea of where i was going to be competitive and had a good dice with first a 911 and then a 944 both in the above picture i got past them both, interestingly i was able to get past the 944 on the brakes, keeping an eye in the mirrors it was clear the lower powered fwd cars were practically as quick over a lap, looking ahead i was pleased to see i was catching another beemer an E21, i know that car slightly and round brands it cant get anywhere near me, but an unfamiliar circuit is another matter, still i was catching him and hoped to pass it when i noticed the car push on in a couple of corners, more throttle problems, this time it was sticking. i pitted, got out bent the pedal which seemed to fix it, got strapped back in and headed out again, a couple of corners it was sticking again big time, so i pulled off for good.

    looking at the car the problem was obvious, in use the pedal box has bent and that was jamming the throttle. another DNF, oh well, it should be easy to fix!

    i have to say despite the dnf i was pleased how it went, i enjoyed the way the car handled and actually got to race other cars, the sea sick pills seemed to work too

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