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

[Graham]

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?

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

[katana]

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?

[Graham]

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

[rallyrob]

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

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.

[Graham]

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?

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

[Graham]

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.

ive now changed leads, but it used to work on the old ones so why the sudden change?

[rallyrob]

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?

[jcccruz]

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.

[Graham]

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

got bored with wires, im on brakes now, ive started re engineering the front brakes, not to gain performance as they work well, but to gain clearance for wheels, i have 4 different sets of wheels for the car, but only one set will fit the front. the big disc conversion (peugoet 406 coupe) uses a very flat disc with next to no offset so it pushes the caliper out a long way.

i bought some universal bells and willwood discs from rally design, the discs are almost the same size, but with the bell i can save a bit of weight and move the caliper to gain some clearance for the wheels.





i had to bore the centre hole and add the stud holes and slim down the bell, it all mounted up quite well a check with a DTI showed i had 0.005 run out on the disc, that was probably ok, but i had another go at anyway, chucking up the bell in the lathe i trued it up in the chuck on a virgin surface ( well one that i had not already machined) i skimmed the face which goes against the hub, and took a lick off the disc mounting face, refitted to the car the run-out had dropped to 0.0015 at the outer edge of just over 300mm dia the discs, i can live with that

[Graham]

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

is the crank sensor wiring sheilded ? (should be)

i didnt do the injection loom, but it wasnt, although used to run just fine like it, ive since shielded it, then fitted new wire, new connectors both ends etc etc etc, so far nothing has worked............

[alladdin]

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

is the crank sensor wiring sheilded ? (should be) and if so only one end of sheild is earthed.

sorry if granny sucking eggs comes to mind

[Graham]

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

ive sorted fitting the oil temp sensor, i turned up an adapter so it can fit in the sump in place of the redundant oil level sensor.





ive also made enough headway with the new loom that today i realized i only needed make another couple of connections and i would probably be able to start the engine (i left the engine management loom largely intact) it fired up easily



nice to see the dash works, its new but old and i bought it off ebay some time ago, so no comeback if it didnt work. it wil definatly be handy to have a fuel pressure reading and actually be able to be warned of oil pressure/temp issues via an automatic alarm, the car did have an oil temp gauge, but where it was located you'd of never been looking at it during a race, well not unless you wanted to crash!

unfortunately within minutes of running, its clear i still have a missfire issue, this time though it was a low rpm????. Having rewired and replaced practically everything im certain its not a wiring issue.

playing with the wiring with the engine running im now pretty sure its interference between the HT leads and the crank senor wiring, why i dont know, especially given, it not changed from when the previous owner raced it, or i took it to brands. im going to get two sets of 4cylinder leads to try and make up a short set of 6 cyl leads as the current leads are very long, im also going to re route the crank senor wiring, if that doesnt work it might be time ofr a box of matches!

[alladdin]

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

im rather surprised no one has asked weather OMP do bibs

[rallyrob]

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

Has it got access to the main oil gallery in the side of the block, if so could you not use an adaptor of some description an put it in there somehow?

[Graham]

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

cheers, the sump is alloy but its a hell of a lot of work to remove it just to weld something to it, it has got a cooler sandwich plate, but its the factory bmw one wish i dont think suitable for drilling, we will see,its not a priority