View Full Version : clip of Supercharged M Coupe
09-07-2002, 12:50 PM
I did a few 0-60 sprints in my ~400hp coupe and took a video of one of them. My best time was 4.4 seconds.
Here's the Vortech s/c with RMS aftercooler and 11lb pulley
Page that details mods to my car:
09-11-2002, 02:27 PM
I would have thought it would be quicker. I think the regular S54 with a 3.46 rear can do 4.4, but then again, I'm no expert. :dunno:
How were you doing the timing measurement?
09-11-2002, 08:11 PM
I'm no expert at launches so I'm sure a seasoned drag racer could get it down a couple of tenths. I timed it using Adobe Premiere (video software). I used the movement of the car to be the start and the rpm needle hitting redline to finish.
Gearing is a problem in my car. It's very hard to get the most of out first gear since it's over so quickly. I think better times would be made with slightly taller gear ratios that would make the launch much smoother and first gear more usable.
09-12-2002, 07:24 AM
Which rear end ratio are you running?
09-12-2002, 11:03 AM
The standard rear end, whatever that is. Will I run into problems if I go taller (say the rear end from the '02 328i)? maybe torque to the drivetrain will be higher because of more resistance from the rearend (or something like that)
09-12-2002, 11:06 AM
on the Z car forum about putting a 3.46 in an S54 M Coupe:
09-12-2002, 01:31 PM
is that an 8 rib belt and pulley?? Its huge!
09-12-2002, 01:32 PM
his time probably woulda been better had he had a better start. Seemed to be a very mild start (at least from the video)
09-14-2002, 12:04 PM
Yes, that's an 8-rib belt and pulley. It's high boost kit from RMS (10 or 11lbs I think)
09-18-2002, 10:44 AM
hmm, I only have a 6 rib, and I was running 11 psi. I've dropped it to 8 psi though. Cant tell much of a difference if any.
BTW: do you have a dyno with the a/f plotted out? I have never seen an RMS tuned car with a smooth or safe a/f curve. Good dyno numbers. :thumbup: I've got similar HP running 8psi on 91 octane, still more torque though :p
09-18-2002, 12:38 PM
I don't have a plot for a/f, but I was pretty happy with what I saw at the dyno. It's not smooth, but it looks safe :) I think that accounts for my slightly conservative hp and torque readings. The power curve is also very choppy, not smooth at all!
09-18-2002, 02:35 PM
as long as you're running about 12:1 above 4K, you should be safe. RMS tends to tune their cars dangerously lean. My dyno chart was ugly from them. Power curve shoudlnt be choppy either. Little, but not a roller coaster. Check out my old 2.5 dyno on RMS tuning. Its ugly!!! Waaaay too lean for running 11 psi
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