E30zone dragstrip challenge.

[d6dph]

Another 24v weapon?

[DanThe]

Of course

[d6dph]

Good man

[g57yle]

id love a drift day

Last time i went santapod, it was very tight, and you couldnt really do anything apart from straigh line, but then again i did have a bit of fun on the grass for a good 20 mins, when i got to bed that night it felt like i was still sliding! loadsa fun, but i got told off for it on the way out

[tari]

g57yle: Whats your next project? I don't really see any E30's outside yours anymore...

I loved the one in your sig, shame to here what happened to it.

Cheers

Tee

[GrindCulture]

Damn, just read all 13 pages of this badboy! If all goes well will this be happening again next year? I should have just about de-rusted and re-electrified my iS by September, so I'll probably give spanking it down the strip a miss. Unless I stumble across a lot of time and money in the next few months.

[fuzzy]

ive started the work on mine a couple of weeks ago. even at the rate i work i should finish mine in time for this

[maxfield]

M3 will be back lighter, shorter diff, smaller wheels and stickier tyres

[fuzzy]

M3 will be back lighter, shorter diff, smaller wheels and stickier tyres

will your dad let you have a shot driving it on the strip max?

[GrindCulture]

I could always bastardise the M40 touring and run that. I recon with about £200 and a few hours on ebay I could be running maybe 600bhp?

[maxfield]

will your dad let you have a shot driving it on the strip max?

Yes.

[fuzzy]

M3 will be back lighter, shorter diff, smaller wheels and stickier tyres

smaller rolling radius for increased acceleration?

[maxfield]

Correct.

[fuzzy]

ill maybe need to get myself a set of 15's for track and strip days as well.

[march109]

Not only that but smaller wheels (should!) weigh less and as they are sprung mass the ezuivelent mass off unsprung weight is a factor of 4:1 so every 1kg you save on the wheels is worth 4kg on the shell.

[madaboutthe30]

Hey guys, I have been following this thread for quite a while, could someone perhaps remind what the dates are, ive forgotten?

[fuzzy]

Hey guys, I have been following this thread for quite a while, could someone perhaps remind what the dates are, ive forgotten?

some time in september is all i can remember.

[Onz]

Not only that but smaller wheels (should!) weigh less and as they are sprung mass the ezuivelent mass off unsprung weight is a factor of 4:1 so every 1kg you save on the wheels is worth 4kg on the shell.

What do you mean by this? how can smaller wheels save you unsprung weight?

[maxfield]

He said should.

Smaller wheels are usually lighter. Therefore you've got less unsprung mass...

[Onz]

isnt unsprung mass the weight without wheels on the car?

[maxfield]

Unsprung mass, is anything that's off the suspensions, brakes, hub, bearings and wheels.

Unsprung mass is very important! The reason why BK's get slated so much

[reggid]

i wouldn't think unsprung mass would matter on the strip but you don't want wheels with high mass or inertia.

[DRIFTBOY]

This might claer things up a little! ?

http://en.wikipedia.org/wiki/Unsprung_weight

[hoshy]

Yeah reggid is on the money there I think.

march109 was talking about rotating mass, rather than unsprung mass. Just like a lightening a flywheel, lightening the road wheels will allow them accelerate quicker (and decelerate quicker too).

Weight of wheels also affects unsprung mass but that's a different thing - important, but not for the strip.

[reggid]

the wikipedia link above suggest high unspring weight can cause wheel tramp which wouldn't be good for traction but its usually more of an issue at tracks with curves.

[fuzzy]

[march109]

From Car domain:

Sprung vs. unsprung weight.

Simply put, sprung weight is everything from the springs up, and unsprung weight is everything from the springs down. Wheels, shock absorbers, springs, knuckle joints and tyres contribute to the unsprung weight. The car, engine, fluids, you, your passenger, the kids, the bags of candy and the portable Playstation all contribute to the sprung weight. Reducing unsprung weight is the key to increasing performance of the car. If you can make the wheels, tyres and swingarms lighter, then the suspension will spend more time compensating for bumps in the road, and less time compensating for the mass of the wheels etc.
The greater the unsprung weight, the greater the inertia of the suspension, which will be unable to respond as quickly to rapid changes in the road surface.
As an added benefit, putting lighter wheels on the car can increase your engine's apparent power. Why? Well the engine has to turn the gearbox and driveshafts, and at the end of that, the wheels and tyres. Heavier wheels and tyres require more torque to get turning, which saps engine power. Lighter wheels and tyres allow more of the engine's torque to go into getting you going than spinning the wheels. That's why sports cars have carbon fibre driveshafts and ultra light alloy wheels.

whole article available here: http://www.carbibles.com/suspension_bible.html

[hoshy]

The above article confuses unsprung weight and rotating mass.

Lighter wheel *always* == less unsprung mass. But less unsprung mass *does not* always == lighter wheels.

Lighter wheels (of the same diameter) == better acceleration. Less unsprung mass might be lighter wishbones and brake disks, no affect on accel but will affect to a greater or lesser degree the handling of the car.

Sprung vs. unsprung weight.

Simply put, sprung weight is everything from the springs up, and unsprung weight is everything from the springs down. Wheels, shock absorbers, springs, knuckle joints and tyres contribute to the unsprung weight. The car, engine, fluids, you, your passenger, the kids, the bags of candy and the portable Playstation all contribute to the sprung weight. Reducing unsprung weight is the key to increasing performance of the car. If you can make the wheels, tyres and swingarms lighter, then the suspension will spend more time compensating for bumps in the road, and less time compensating for the mass of the wheels etc. The greater the unsprung weight, the greater the inertia of the suspension, which will be unable to respond as quickly to rapid changes in the road surface.

Here it fails to make clear the difference:

As an added benefit, putting lighter wheels on the car can increase your engine's apparent power. Why? Well the engine has to turn the gearbox and driveshafts, and at the end of that, the wheels and tyres. Heavier wheels and tyres require more torque to get turning, which saps engine power. Lighter wheels and tyres allow more of the engine's torque to go into getting you going than spinning the wheels. That's why sports cars have carbon fibre driveshafts and ultra light alloy wheels.

[Jhonno]

[Onz]

Thats what I was confused about. Were we talking about rotational forces or gravitational? i understand that lighter wheels will spin up faster and also make the suspention work more efficiently. But Heavier wheels should also make higher top speeds due to the rotational Mass.

[Jhonno]

lol no they wont..

in the same way fitting a lighter flywheel does not reduce your top speed..

[GrindCulture]

Thought I'd bring this back to see if anyone else wants to join the fun and games.

A1 Under 1991cc Period Engines
- Maxfield - 316i Touring
-Treeseries - 318IS. i think?
- Agreen - Maybe a big Maybe but , 318is striped out and on ITB;s
- Si316 - 316 -m10 with old school tuning.
- GrindCulture - 318iS... God knows what state she'll be in.

A2 Under 1991cc FI/NOS/Not OEM/M Car
- Hoshy - 2 conditions. my charged iS is running and, Matt Appleyard joins the challenge
-Appletree M42 S/C-Specialy for you hoshey

B1 Under 2950cc but over 1992cc Period Engines
- Oakey. m20b27
- March109, m20b25/b27/b28/b29 (have a choice of all 4 if I pull my finger out!)
- Dmaxfield, M3. Assuming right category?
- Oguz327, 2.7

B3 Under 2950cc but over 1992cc FI/NOS/Not OEM
- Old_Skool_2002, supercharged 325iX
- rossle, 2.5 big trim holset hybrid
- Fuzzy ,cosworth turbo touring
- Oldroydsr4 HX40 touring
- cecotto_singh e30 m3 cosworth
- Gadjit, 2.7 Turbo play thing
- midnight soon to be m20b25, ms, wasted spark and hopefully anti-lag
- Ste, M50B28 Rocket Ship
- Kevin, M50/52 Hybrid Thingy
- mattG

C1 Over 2950cc Period Engines
- milko m30 2dr.
- Theo, 335i
- Andy335Touring, 335i

C2 Over 2950cc FI/NOS/Not OEM
- Jhonno S50B30
- Driftboy - 335i Turbo

[big_jof]

Details details details Gents - Is there a date for this yet? Will my stock M20 run in B1?? It has a K+N but thats it.

Is there any class adjustment for LSD (Standard 325s diff) / been stripped out or is it only whats in the front that counts.

Whats the deal with Santa Pod - I assume it run what ya brung and you only pay for each run you do??

Sorry for all the questions but after sifting the first 6 pages for answers I got bored!

I fully expect to get handed my arse on a platter but having 1/4 time for it would be good.

[big_jof]

Ooh found most of the details in the events section imagine that - damn insomnia - still clarification on the class would be good - Thanks.

[Milko]

Edited to add my best time so far....

A1 Under 1991cc Period Engines
- Maxfield - 316i Touring
-Treeseries - 318IS. i think?
- Agreen - Maybe a big Maybe but , 318is striped out and on ITB;s
- Si316 - 316 -m10 with old school tuning.
- GrindCulture - 318iS... God knows what state she'll be in.

A2 Under 1991cc FI/NOS/Not OEM/M Car
- Hoshy - 2 conditions. my charged iS is running and, Matt Appleyard joins the challenge
-Appletree M42 S/C-Specialy for you hoshey

B1 Under 2950cc but over 1992cc Period Engines
- Oakey. m20b27
- March109, m20b25/b27/b28/b29 (have a choice of all 4 if I pull my finger out!)
- Dmaxfield, M3. Assuming right category?
- Oguz327, 2.7

B3 Under 2950cc but over 1992cc FI/NOS/Not OEM
- Old_Skool_2002, supercharged 325iX
- rossle, 2.5 big trim holset hybrid
- Fuzzy ,cosworth turbo touring
- Oldroydsr4 HX40 touring
- cecotto_singh e30 m3 cosworth
- Gadjit, 2.7 Turbo play thing
- midnight soon to be m20b25, ms, wasted spark and hopefully anti-lag
- Ste, M50B28 Rocket Ship
- Kevin, M50/52 Hybrid Thingy
- mattG

C1 Over 2950cc Period Engines
- milko m30 2dr. (PB of 14.7 so far...)
- Theo, 335i
- Andy335Touring, 335i

C2 Over 2950cc FI/NOS/Not OEM
- Jhonno S50B30
- Driftboy - 335i Turbo