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      11-25-2008, 07:50 PM   #1
reRESERVEDFX
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BMW Z4 05/06 Models Acceleration

Hey,

I'm just wondering how big is a difference between BMW's 3.0si 255HP and 3.0i 235HP engine acceleration wise? Are there big gaps in 0-60 MPH time in both of these cars?

Also, stupid question but what's the average 0-60 time for an E46 M3 manual?

I'm considering another BMW and I think that when 235 is plenty for a lightweight Z4, the 5er is gonna be too heavy and I better be off with 545i or just go with 06 330i (255HP)
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      11-26-2008, 12:17 AM   #2
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I would go for an E46 M3 if u are not considering the M coupe or roadster M3 manual realisticly get around 5 to 5.5 but with extremely good tires and a hard but effective launch i believe E46 m3 can get like 4.9 zero to sixty.
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      11-26-2008, 02:42 AM   #3
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Oh no I'm not getting an M3, I was just wondering since I've read somewhere that they got stock M3 from 0-60 in 4.7s which seemed quite unbelievable.

I was just wondering whether there's significant change in acceleration between BMW's 3.0i 235HP engine and 3.0si which is 255HP. I mean 20HP seems like slightly significant boost in a car of that size. It also bothers me because I'm thinking about a new 5er and I'm still wondering whether 235HP is gonna be enough for such a big car.
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      11-26-2008, 06:59 AM   #4
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Quote:
Originally Posted by reRESERVEDFX View Post
Oh no I'm not getting an M3, I was just wondering since I've read somewhere that they got stock M3 from 0-60 in 4.7s which seemed quite unbelievable.

I was just wondering whether there's significant change in acceleration between BMW's 3.0i 235HP engine and 3.0si which is 255HP. I mean 20HP seems like slightly significant boost in a car of that size. It also bothers me because I'm thinking about a new 5er and I'm still wondering whether 235HP is gonna be enough for such a big car.
It would depend on what you think significant is. It might be as much as 1 to 2 tenths of a sec. Not likely your calibrated butt accelerometer will tell the difference.
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      11-26-2008, 10:06 AM   #5
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Several factors to consider incl weight of car, gear ratios, axle ratios, etc. If you're considering acquiring one of two different model 5's, I'd suggest you drive the 2 models and/or post on a 5 forum to find someone with experience.
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      11-26-2008, 01:40 PM   #6
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Sometimes looking at Dragtimes database can help. Not much for stock Z4's (the ones denoted with # on them), but it appears that the 06+ si is slightly quicker and faster in the 1/4 mile than the earlier Z4's. Not enough data, but there is probably a small gap. It does not seem enough to really worry about if you find a car that has the colors and equipment you want.

http://www.dragtimes.com/BMW--Z4-Drag-Racing.html

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      11-26-2008, 02:04 PM   #7
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Quote:
Originally Posted by m3griff View Post
Sometimes looking at Dragtimes database can help. Not much for stock Z4's (the ones denoted with # on them), but it appears that the 06+ si is slightly quicker and faster in the 1/4 mile than the earlier Z4's. Not enough data, but there is probably a small gap. It does not seem enough to really worry about if you find a car that has the colors and equipment you want.

http://www.dragtimes.com/BMW--Z4-Drag-Racing.html

Jeff
By earlier Z4 do u mean 2.5 i won't believe that a 3.0 z4 with 230hp can't beat a si even auto ones.
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      11-26-2008, 03:29 PM   #8
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I wouldn't expect there to be a big difference between the 3.0si and the earlier 3.0i (both are quite quick) - probably 1/3 to 1/2 the difference between the earlier i and the M. Given the lack of reliable and comparable data between the two when I was looking, I mostly looked at the fatter torque curve along with the extra 30 bhp of the 3.0si as the tipping point on my decision. Given its character as a sports car, I'm not as interested in 1/4 mile or 0-60 clutch burning times as I am in how it works on the road. The wider power band between torque peak and power peak indicates that the additional power is usable power rather than just some added top end for bragging rights.
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      11-26-2008, 07:29 PM   #9
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I would think that there would be a noticeable difference in acceleration
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      11-26-2008, 11:22 PM   #10
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Quote:
Originally Posted by Mikewarlover View Post
By earlier Z4 do u mean 2.5 i won't believe that a 3.0 z4 with 230hp can't beat a si even auto ones.
I meant to compare a 3.0i with a 255 hp 3.0si. I bet 0-60 are pretty close (.1-.2 sec) given that 1/4 mile trap speeds seem to only be about 2-3 mph better for the si. Bottom line is that the day-to-day driving won't feel that different.

Comparison to a 2.5 is a completely different matter.
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      11-26-2008, 11:25 PM   #11
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Quote:
Originally Posted by m3griff View Post
I meant to compare a 3.0i with a 255 hp 3.0si. I bet 0-60 are pretty close (.1-.2 sec) given that 1/4 mile trap speeds seem to only be about 2-3 mph better for the si. Bottom line is that the day-to-day driving won't feel that different.

Comparison to a 2.5 is a completely different matter.
Yea depends on your situation. My friend got an I because there wasn't a good si he wanted so he went for the I. Honestly i struggle to find them any different. its like the new E92 328 i had compared to the old e90 330. In race obviously the 330 isgonna be slightly faster but both ain't that fast.
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      11-27-2008, 08:52 AM   #12
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Originally Posted by Mikewarlover View Post
Yea depends on your situation. My friend got an I because there wasn't a good si he wanted so he went for the I. Honestly i struggle to find them any different. its like the new E92 328 i had compared to the old e90 330. In race obviously the 330 isgonna be slightly faster but both ain't that fast.
For me, between the 3.0i and si, I would go with a car that had the colors and options I wanted - definitely the sport package. Also condidering miles and condition.
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      11-27-2008, 12:19 PM   #13
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When it comes to improving 0-60 times, it pays to pay less attention to horsepower and check to see if the car maker changed the gearing or improved torque numbers - that tends to be where they make their acceleration gains. In the case of the 2005 3.0i over the 2006 3.0si, I think BMW went from a 3.07 final drive to a 3.23 (3.46 for the coupe). Buy the 2005 3.0i and spend $400 on a 3.46 rear end, you're back in the game.

Similar effect with the E46 M3 compared to the E90 M3 - while the 30ft-lbs they added helps the car off the line, they also changed from a 3.62 final drive to a 3.85. Add in the fact the new car weghs more, and you can see why swapping a 3.91 or 4.10 final drive would make the E46 fast enough for you to not be able to tell the difference without instruments.

As for the E46 M3's times. Factory quoted figure was 5sec for 0-60, most magazines got 4.7sec. The new M3 is quoted at 4.7sec by BMW, most mags get 4.4sec.

Last edited by epbrown; 11-27-2008 at 12:43 PM.
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      11-28-2008, 08:30 AM   #14
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Quote:
Originally Posted by epbrown View Post
When it comes to improving 0-60 times, it pays to pay less attention to horsepower and check to see if the car maker changed the gearing or improved torque numbers - that tends to be where they make their acceleration gains. In the case of the 2005 3.0i over the 2006 3.0si, I think BMW went from a 3.07 final drive to a 3.23 (3.46 for the coupe). Buy the 2005 3.0i and spend $400 on a 3.46 rear end, you're back in the game.

Similar effect with the E46 M3 compared to the E90 M3 - while the 30ft-lbs they added helps the car off the line, they also changed from a 3.62 final drive to a 3.85. Add in the fact the new car weghs more, and you can see why swapping a 3.91 or 4.10 final drive would make the E46 fast enough for you to not be able to tell the difference without instruments.

As for the E46 M3's times. Factory quoted figure was 5sec for 0-60, most magazines got 4.7sec. The new M3 is quoted at 4.7sec by BMW, most mags get 4.4sec.

A little bit of Motor Trend Homework for you:

2003 Roadster 225hp: 0 - 60 6.1 sec; 1/4 mile 14.5 sec 96.6 mph.
2007 Roadster 255hp: 0 - 60 5.1 sec; 1/4 mile 13.8 sec 100.1 mph.
2006 M Coupe 330hp: 0-60 4.9 sec; 1/4 mile 13.4 sec 104.2 mph.

Road and Track also reports:

M Coupe at 0 - 60 4.9 and 1/4 13.4 105.3.
2003 Roadster 0 - 60 5.6 and 1/4 14.4 95.7.

Car and Driver did post a 4.6 and 13.2 107 for 1/4. M Roadster by the way.

Even in day-to-day driving, not much difference between S and Si And as a matter of published fact not much difference in day-to-day between Si and M.
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      11-28-2008, 03:43 PM   #15
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I ve seen 13.8 quater mile times for Si before yet i seriously think thats with a very hard launch doing a respective amount of damage on the tranny. In fact i hardly believe the extra 30 horsepower is gonna make that much of a difference.
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      11-28-2008, 04:29 PM   #16
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Quote:
Originally Posted by rc'Z View Post
A little bit of Motor Trend Homework for you:



Even in day-to-day driving, not much difference between S and Si And as a matter of published fact not much difference in day-to-day between Si and M.
I would argue BIGTIME difference in day to day driving with M vs others. Sorry. This sort of comparison is the danger of magazine racing as it oversimplifies way too many important variables. Now they are all FANTASTIC cars but definitely different and worth a test drive to determine your individucal preference.
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      11-28-2008, 07:10 PM   #17
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Quote:
Originally Posted by rc'Z View Post
2006 M Coupe 330hp: 0-60 4.9 sec; 1/4 mile 13.4 sec 104.2 mph.

Road and Track also reports:

M Coupe at 0 - 60 4.9 and 1/4 13.4 105.3.
This I don't get - BMW's factory time is 4.9sec and they're known to be conservative with their times. Every other BMW model ever tested by a magazine gets a better time than that quoted by the factory except the M Coupe.
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      11-28-2008, 07:13 PM   #18
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I also doubt that 20HP makes so much difference in the exact same car. I'm more lenient to the epbrown's opinion about final drive ratios but it still doesn't explain how 3.0i can get a second faster from 0-60 than 3.0si. Today I did 2 hard on starts and managed to get about 5.2 and 5.4s 0-60 times respectively. Stock 05 Z4 3.0i.
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      11-28-2008, 07:37 PM   #19
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Your 3.0i is quicker than an Si Stock? Did I read that incorrectly or did you mess up somewhere? and if so.. then whats the point to purchase an 3.0Si if there's not much difference in power?
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      11-28-2008, 07:41 PM   #20
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Si was really introduced to improve the Roadster a little bit over time. And M is on an entirely different level as Si to drive. M is just so brutal and so much more exciting and significantly faster when u rev it a bit.
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      11-28-2008, 07:43 PM   #21
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Quote:
Originally Posted by knuklz View Post
Your 3.0i is quicker than an Si Stock? Did I read that incorrectly or did you mess up somewhere? and if so.. then whats the point to purchase an 3.0Si if there's not much difference in power?
I think the general them of many of these posts has been that there is no reason to pick an Si over an 3.0i, unless you have to have more warranty or certain colors/equipment.

I would agree with the earlier post that the M is a whole different animal - numbers notwithstanding. The M has an entirely different feel to it.

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      11-29-2008, 04:48 PM   #22
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wait a minute whats the 0-60mph on a 3.0Si? If you post please have actual number not some bull crap Cheers!
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