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Discussion Starter · #1 ·
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.

video

Here's the Vortech s/c with RMS aftercooler and 11lb pulley



Page that details mods to my car:

website
 

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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?
 

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Discussion Starter · #3 ·
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.
 

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Discussion Starter · #5 ·
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)
 

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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
 

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Discussion Starter · #11 ·
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!
 

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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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