0-60 Timings

[Siftah]

So I've resisted the temptation for a long time but ultimately I just had to do it.

Using the iPhone and Dynolicious I did a quick timed run from a standing start to 60mph. Road was damp and I didn't really push too hard (clutch preservation firmly in mind). 60mph comes up before you hit 3rd though I didn't bounce it off the red line (I've killed engines before - it's not an experience I wish to replicate). Tyres would have been fairly cold, air temp about 10 degrees Celcius. Slight uphill section of road (private, naturally) and I actually had TC turned on fully.

Result was 6.6 seconds 0-60 against the books time of 5.9 (totally standard 3.0, including the runflats and suspension).

Fully convinced the Z is capable of 5.9 seconds or less, as per the book

 

[Taz]

where in moston is this private road lol

 

[Siftah]

where in moston is this private road lol

Err, it's, err, well it's a secret.

 

[Z4 Beemer]

Nice! Hadn't really thought about it before, but according to the graph it gets to 60mph almost uniformly, and I suppose it should (e.g. 1 sec to get to 10mph, 2 secs to get to 20mph etc etc.)

The official figure from BMW is 5.9secs and thats for 0-62, but we won't argue over 2mph

 

[Siftah]

Nice! Hadn't really thought about it before, but according to the graph it gets to 60mph almost uniformly, and I suppose it should (e.g. 1 sec to get to 10mph, 2 secs to get to 20mph etc etc.)

The official figure from BMW is 5.9secs and thats for 0-62, but we won't argue over 2mph

Yup, I suspect they choose the gear ratios precisely to negate that 2nd change being required, it can make a big dent in the 0-60. Another of those "gotchyas" when trying to compare cars based purely on specifications

I don't spend much time on the motorway, but i've always felt the Z4 was geared more for 0-60 blasts than for long legged motorway cruising. This is the first car I've had with a 6 speed box though so I've nothing to compare it against. I certainly expected 6th to be a lot longer than it is!

 

[aquazi]

I have my first rolling road and santapod session in my Z within the next month, so i'd be interested to see how the 1/4 miles would compared to my old S2k.

 

[mrklaw]

Yup, I suspect they choose the gear ratios precisely to negate that 2nd change being required, it can make a big dent in the 0-60. Another of those "gotchyas" when trying to compare cars based purely on specifications

I don't spend much time on the motorway, but i've always felt the Z4 was geared more for 0-60 blasts than for long legged motorway cruising. This is the first car I've had with a 6 speed box though so I've nothing to compare it against. I certainly expected 6th to be a lot longer than it is!

I'd agree with you. At 80 on a motorway, my 3.0 is sitting around 3k revs which is a little high for my liking for a long cruise. I think my previous E92 was low 2k's at the same speed, much quieter for cruising.

I wonder if they adjusted any of the ratios for different countries? Its a 155 limited car right? Can't imagine it being that pleasant sitting on the autobahn at 100-110 with the engine screaming at you for an extended period of time.

 

[aquazi]

Nearly all of my previous sporty cars will do 60 in second gear.

Some of the GTR drivers even insist of launching in 2nd gear to get the best drag times.

 

[Siftah]

I'd agree with you. At 80 on a motorway, my 3.0 is sitting around 3k revs which is a little high for my liking for a long cruise. I think my previous E92 was low 2k's at the same speed, much quieter for cruising.

My only other comparably engine-sized car was a 2.5 V6 Ford Probe and that was (from memory, it was a long time ago) around 2k at motorway speed. I don't find the Z noisy though, I don't think it'll bother me - it's more the fuel consumption on a long trip I'm thinking of. If I do ~4k miles on holiday again it's going to definitely take a dent in my fuel bills

I wonder if they adjusted any of the ratios for different countries? Its a 155 limited car right? Can't imagine it being that pleasant sitting on the autobahn at 100-110 with the engine screaming at you for an extended period of time.

I believe it's 155 limited, yeah, not been that quick in it yet

Would be surprised if the ratios were adjusted for different countries, but I don't really find 100+ uncomfortably noisy so I guess it depends on your experience...

 

[shambolic]

Merc geared the slk (6speed manual) so you have to change to 3rd before 60. First gear was so short you were in it and almost immediately had to change up( was annoying as hell and made car jerky) in 6th it sat at 80 with just over 3k revs (it was the 4cyl supercharged though).
The zed is a lot smoother and quite happily sits in 6th a lot lower down too. I find it a more pleasant drive when just tootling in traffic.
Not had a chance for an A or B road proper blast yet without wifey in car

 

[craig3.2]

The std 3.0 (pre facelift,2006) is capable of pulling 0-60 in 5.7 secs and go onto 169mph,when de-limited
(with no power gains/mods,other than the de limit and a kn panel airfilter)
so i am led to believe :evil:

though once is enough,lol

 

[texasjohn]

^ Most of the official BMW times for 0-60 are a little conservative, as not to encroach on the more expensive models. I am sure that the Z4M 0-60 is less than 5 secs, probably 4.8 or so.

As for the top speed I think 169 is a little optimistic; The Z3 3.0i with the same 231hp engine would top out at 149mph and because of this didn't need restricting. The Z4 has better aerodynamics and gearing and is limited. That said, I don't think it would do much more than 155, maybe high 150s. The Z4M would probably hit 165. You need a lot of extra power for incremental speed increases at that kind of velocity. I think speed increase is related to power cubed.

As an example (and while it is a completely different vehicle), a 125cc sports bike restricted to 12hp hits about 65-70mph. Unrestricted with double or nearly triple the power (talking two stroke bikes here which tend to make 24hp-30hp without restriction) you are still only hitting a true 100mph if you are lucky. Speedo might be optimistic as well, I saw 110mph on a faired TZR but I am sure it really wasn't that fast!!!

So I've resisted the temptation for a long time but ultimately I just had to do it.

Using the iPhone and Dynolicious

Is Dynolicious a pay-for app or free?

I have a Dyno app on my iPod touch, I don't think it is that one.

When you go on a flight (if you can be discreet with it) the Dyno results for the aircraft take off is fun. Most of the data you need to set up the 'vehicle' is in the aircraft fleet information at the back of the inflight magazine

Continental B757 with RB211 engines wasn't as fast to 60 as I thought it would be, but 0-130 was more impressive!

 

[Siftah]

Not had a chance for an A or B road proper blast yet without wifey in car

Removing the audible speed limiter device from the passenger seat definitely improves the driving experience - a well recommended mod that one

 

[Andy]

Why leave DSC on? Good fun though 8)

 

[PawnSacrifice]

Good data collection :wink:

You really need to go for a good blast first, you know, to warm the tyres and engine.

You should try with the DTC off... far too easy to get wheelspin

 

[aurabbit]

Cool.

Here's mine

sDrive 35i with DCT in sport mode. This was done when the car still fairly new so I kept the engine from revving more than 5k.
I was also watching the speedo trying not to get too fast and ended up feathering around 50-55mph.

I noticed the HP graph in mine is smoother than siftah's, I think that shows how awesome the DCT is.

Maybe I should go back to that, ehm private road now that the car has passed the break in period.

--ricardo

 

[Siftah]

The std 3.0 (pre facelift,2006) is capable of pulling 0-60 in 5.7 secs and go onto 169mph,when de-limited

How was the 169mph measured? If it wasn't done with a GPS or similar then it's unlikely to be accurate

 

[aquazi]

i turned my DTC off while we had some snow - forgot i had it off and went around a mini roundabout far too sideways at under 15mph!

Bit of an animal without the traction control.

 

[Siftah]

That said, I don't think it would do much more than 155, maybe high 150s. The Z4M would probably hit 165. You need a lot of extra power for incremental speed increases at that kind of velocity. I think speed increase is related to power cubed.

It's something along those lines - hence the huge amounts of horsepower needed to break the 200mph barrier. The aerodynamics and the effect of wind resistance start to really make a big difference at higher speeds.

Is Dynolicious a pay-for app or free?

It's paid for, only a couple of quid though from memory. There are a few different variants and I couldn't honestly say whether Dynolicious is the best. I don't much like the way you have to click start and then have a couple of seconds before you launch, but it's not bad.

When you go on a flight (if you can be discreet with it) the Dyno results for the aircraft take off is fun. Most of the data you need to set up the 'vehicle' is in the aircraft fleet information at the back of the inflight magazine

I've never done this with the accelerometer based apps but I've recorded a flight using a GPS and that was quite interesting - how did you mount the phone? Would have thought the motion of the plane would have made that quite in-accurate?

 

[Siftah]

Why leave DSC on? Good fun though 8)

Completely by accident, just forgot to turn it off

It was more a "lets try out the app and see how it works" than a "lets go all-out for a top 0-60 time" kind of affair