0-60 time in a 325i

[orangecurry]

and what is the diff attached to?

[Jon_Bmw]

I think the thing that makes you think you are fast is the error on the speedo. There is a HUGE difference between reaching 50mph and 60mph. So say you speedo is out by 10% you are only doing 54mph, then you are running on 17" wheels with the wrong profile thats a further 2% out(maybe just guessing here).

To put this into perspective, my audi s4 avant claims it does 0-80kmhs(0-50mph) in 4.7 seconds
BUT...........................to get to 0-100kmhs (0-62) its 7.1

As you can see there is a 2.4 second difference between the two times, a high proportion of the total time. The slower a car is the long that difference is. I can see how its concievable to think that your 325i does 0-60 in 6/6.5 seconds on a clock and using the speedo...

In real life...Naa afraid not

[awx]

Also, the weight reduction issue - wouldnt u need to take into account the weight of the driver (i was under the impression when mags do their tests, thay have the added weight of a passenger for some reason). To get the bhp to weight gains, you would need to take into account the driver and reduce his/her weight from the car (i thought). cool thread though..

[awx]

orangecurry: think im looking at it all wrong - the wheels act as another gear to the diff (making the speedo out). bigger wheels will have further to travel. hmmm bigger wheels = better top-end

[Davenotouring]

It's more the weight which is the problem of big wheels.

[Kos]

bloody hell, all this over a claimed 0-60 of 6.5 seconds

[awx]

What if you had super grip tyres and wheels the size of golf balls
id think the 0-62 time would be more believable

[Jesus325iTouring]

Nobody seems to have pointed out whether on not we're talking MPH or KPH

[parksie]

Yeah it's getting to be a bit of a yawn now but it's also keeping me interested i also spend alot of time on a e31 forum, your average 8 packs around 300 bph so these guys fit an upgrade chip promising a 15% improvment so without doing a rolling road test they start spouting their claimed o-60 times & their seat of the pants timed runs.

Everyone seems to add 15% to 300 bhp & end up with a 345 hp monster just because they have been relieved of Ԛ£300 + & would dearly love to believe the promised improvements

This year i fitted a 400 + HP Supercharger to my 840 the result is a tremendous improvment over stock but once rolling roaded didn't quite live up to the figures published.

The manufacturer claimed a 0 to 60 in 5.1 secs, try as i might i cannot get below 5.4 secs and this useing a G-tec performance meter , not some out of time dash computer!

If your'e going to make this claims then PLEASE do some research 1st or this weekend do the timed run at Santa Pod & bolster your Claim

[DRIFTBOY]

5.4 seconds is good going dude!
The claimed 5.1 seconds might have been done on a grippier surface, or with grippier tyres, or in more suitable conditions etc.
I'd be happy with that myself!

Good work!

Have you done a timed quarter mile?

[parksie]

No mate i havn't yet managed to do the 1/4 mile run .

The day i choose to do the previously mentioned timed runs i went up to my local industrial estate on a sunday afternoon i got the G-tec set & buried the pedal in the shag pile these babies wernt ment for such brutality 7 as soon as the speedo was approaching 60mph some fecking idiot on a push bike came straight acrioss the road in front of me Bastards!!! dont they know that Sunday afternoons are for your performance testing

So with that & nearly crapping myself i haven't yet re-fixed the G-tec

These G-tec gadgets also calibrate 0-100& 100-0[ accleration & braking] + your 1/4 mile times! i'm really impressed, i recon if i go on a diet & throw some of the luxurious extras out of the car i may yet get under 5 secs to 60

[DRIFTBOY]

That G-tec thing sounds great!
What exactly is it (excuse my ignorance) and, if you don't mind me asking, how much was it to buy?

[parksie]

The G tec plugs in your ciggie lighter socket & is a mini sought of performance computer, you need to input the cars weght in kgs etc, it does a count down then you hit it!!! get up to 60 or 100 mph then slow down gradually it then tells you the times achieved, easy as that.

I got mine from E bay as new condition Ԛ£55 cost around Ԛ£ 175 when new

[DRIFTBOY]

Thanks!

I've got to get me one of those!

Then get my car weighed!

Then thrash the arse off it - again!

[dazleeds]

i like the sound of them too

[parksie]

Check this one now on E bay item number140046239576, its the more complicated /advanced model from mine but at least you can see what they're about

[Speedtouch]

I have a Transport Source Book of original road tests of the E30s done by the likes of Autocar, Motor, etc.

They reckon a standard 325i does 0-60 in 7.4 sec, a C2 Alpina 2.5 does it in 6.7 sec (essentially a standard 525i engine with close-ratio ZF gearbox - introduced before the 325i came to market) and a C2 Alpina 2.7 does it in 6.8 sec (Motor magazine, April 19, 1986).

The obc may be an 80's relic but I shouldn't imagine the stopwatch is that innaccurate, if the main clock keeps good time.

If the engine's been kept in a reasonable state of tune there's no reason why such acceleration figures shouldn't still be achievable, given the right conditions.

[dazleeds]

us bomber jacket

[DRIFTBOY]

I was about to say that too!

[parksie]

Daza

I take it your a Pink Floyd Fan

[dazleeds]

theres noway that jackets gonna time my 1/4mile

[dazleeds]

Daza

I take it your a Pink Floyd Fan

oh yess only since birth tho

[DRIFTBOY]

Daza

I take it your a Pink Floyd Fan

So am I!

[dazleeds]

well pull up a beanbag and skin up mate

i sit in the corner
no one will bother me

[DRIFTBOY]

Sounds like a nice chilled out evening in to me!

I'll put on Dark Side Of The Moon and relax!

[parksie]

I've not long had the PULSE dvd if you havn't seen /heard it get it NOW Feckin brilliant

[dazleeds]

got it on right now fella

coming back to life beats o/60 anyday

[DRIFTBOY]

0 - chilled in 3.2 seconds!

[DRIFTBOY]

Nick Mason and David Gilmour have got some damn fine motors too!

[dazleeds]

http://www.e30zone.net/modules.php?name ... 389#509389

b4 we get told off

[fuzzy]

The G tec plugs in your ciggie lighter socket & is a mini sought of performance computer, you need to input the cars weght in kgs etc, it does a count down then you hit it!!! get up to 60 or 100 mph then slow down gradually it then tells you the times achieved, easy as that.

I got mine from E bay as new condition Ԛ£55 cost around Ԛ£ 175 when new

how accurate are these g-tec timers?they sound interesting.with regards to the size of the wheels,usually for every inch inrease in the wheel diameter you drop a profle size on the tyre so it keeps the rolling radius roughly the same so it wouldnt affect times that much and a lot will come down to gearing as well.i reckon my cossie touring would do 0-60 in about late 5's to 6 seconds even though ive got nearly 50% more power than a standard cossie that will do 0-60 in 6.1 although ive not had it timed yet

[parksie]

I can't vouch for their accuracy but when i 1st tried it my times were lower than expected but still good & probably more realistic

[bottlecapE30]

I have a g-tech and found that they are really only accurate if you have the weight of the car with in 10 lbs. I have the road race model it spews all kinds of cool useless info

[crazyenglishman]

Well i think ive really started somethng there

[Wilson325i]

nice thread