got to know from a start on a straight road what would win a bmw 330xi or my mazda rx8 both stock

 

Wrong forum to ask. From the forums menu when you clicked on the link to enter this forum....

 

Click the link to find the answer -

www.rx7club.com

 

No1 said he was street racing...he jus asked wut would win in a race....how do you know he's talking about "roadracing" or "streetracing"

People gotta relax on this forum n stop given people hard time....

 

Most importantly, who's driving? A bad driver will lose a race, even if the cars are unmatched. What are the specs on a BMW 330xi (weight, HP, tourque, tranny, etc.)? Ha... what are the specs on the RX-8 (6port or 4port, Auto or Manual)? You're not being descriptive enough. Do the research first and don't make us guess. It might be that you'll answer your own question.

 

The 330xi will not beat a MT rx-8 given equal drivers. I suppose if it was snowing...

Actually even the 330 sport edition can not beat an rx-8 given ideal conditions, or what the magazines claim.

 

The 330 with the performance package would have little problems disposing of an RX-8, but the xi it's probably a drivers race.

 

Road & Track sez:

RX-8 (recent test on production model): 0-60: 6.1. 1/4 mile: 14.6.
330i (that's the 225 hp sedan w/MT): 0-60: 6.1 1/4 mile: 14.7

A 330xi is 200 lbs heavier than the tested 330i, so it would be a bit slower.

Now a 330Ci, with 235 hp, well, it's probably a touch quicker than an RX-8, assuming both drivers can fully take advantage of their car. To say it would have "no problem disposing" of an RX-8 is nice theater, though. But anyway, that's not what the poster asked.

One thing is for sure - in a street start, the 330xi will pull ahead initially. You'd have to resort to an agressive launch to keep up, I suspect. Once underway, if you use your gears right, you should have him.

 

I wouldn't be surprized if the AWD dropped both times. While the Xi is 200 lbs heavier it will run a much quicker short time. They might offset eachother but it's also posible that it will run quicker times but a slower trap speed.

For example:
the EVO runs a 1/4 mile around 13.5 @ ~100mph
A 350z runs a 1/4 mile around 14.0 @ ~100 mph

As indicated by trap speed, both the EVO and 350z have similar acceleration from a roll but the AWD drops the ET of the EVO by 0.5 seconds.

Here's the speculation. If you added 200 lbs to the BMW 330i the 1/4 mile might increase from 14.7 to 15.0. Now reduce that time by ~0.5 seconds for the AWD and you have 14.5. So while the 330xi might have a better ET, it's slower.

 

What happened to the thread starter? Did he fall off the face of the planet?

 

from a roll, the 8 shouldn't have a problem

 

Good point. On the other hand, the 330 xi may not have enough power to get a wheel-smoking AWD launch, in which case the AWD will hurt it, not help it, and it becomes a 15.2 second car. I wonder how it pans out?

Either way, if you look at a street start (which is what most of us do) any 330 will have a leg up on the RX-8 in the stop-light drags.

 

The only performance numbers I have seen for the sport package had the SMG not a pure manual, as such it was a touch slower than the numbers posted in the magazines for the RX-8. With a manual it should be very very close. It's like arguing that the G35 MT puts down faster times. It is so close you should not base any real world decisions on numbers put out by professional drivers.

 

The number I can't figure out is how R&T or MotoTrend (can't remember) listed the WRX wagon as slower than the RX-8. From the top of my head they said 6.2 0-60 time. Yet they had the regular version at 5.6. I just can't imagine how a little extra weight can add 1/2 a sec on 0-60 times.

 

Do you recall which transmissions those WRXs had? I think the Auto WRX is about .5 slower than the manual (I may be wrong).

 

The R&T numbers on the Rex wagon are for an auto. They comared it in a round-up of "sporty" small wagons and one of the test criteria is that all cars had an auto.