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Old 8th July 2011, 18:58   #1
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Dyno, drag, track - in search of my E39 Trifecta

In keeping with the philosophy "learn to crawl before try to walk", I have focused primarily on restoring stock performance and resisted jumping to go fast goodies. For the first time, I have quantitative data that confirms my Beast is putting down descent numbers (319lb/ft, 341whp).

The next step is to clock the almight ET. It will be the first time for both me and the Beast (PO was a doctor, doubt he ever dragged it). I plan to visit the Englishtown drag strip (only place within reasonable driving distance), and I'm hoping for a 13.5 around 105, leaving 0.1 sec slack for rookie driver If all goes well, will then enroll in a couple of road course school days and let her loose on Limerock Park, and eventually Watkins Glen.

Here's the dyno adjusted to DJ. It was 85F, a bit humid, near sea level. Before hitting the track, I will have Dinan rear roll bar installed, running E60 SSK now. Slowly, but surely paving the way for what will eventually be a reliable, intercooled FI setup with performance headers, and a tune. Appreciate any comments and suggestions on the journey.
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Old 22nd March 2012, 06:42   #2
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Finally had a chance for the second installment of this series. I stopped by Northeast Motorsports in NJ to have a few things looked at, and swang by Englishtown Raceway on the way home (ok, it was a 100 mile detour). The car put down 13.75 @ a hair under 104. The clutch slips in the higher RPM, and the car weighted in at 4206 lbs with driver. I may have left a couple tenths on the table slipping through the clutch, but I'm happy with the power it is putting down.

The clutch/flywheel/rms/giubo will all be replaced before the track event in April, here're a couple shots leaving NEM in the morning and the timing slip. Got myself a new camera so no more grainy pictures!
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Last edited by bimmerule; 22nd March 2012 at 06:50.
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Old 22nd March 2012, 11:23   #3
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Nice one Richard !!

Your car looks great, nice photo :

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Old 22nd March 2012, 15:04   #4
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Nice results for a real car. You can get that 60' time down to around 1.9-2.0 with street tires and that will have a pretty large impact on your ET.
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Old 22nd March 2012, 20:14   #5
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Nice! What kind of dyno? On the roller or the the dynajet type
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Old 23rd March 2012, 00:18   #6
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Quote:
Originally Posted by rao View Post
Nice results for a real car. You can get that 60' time down to around 1.9-2.0 with street tires and that will have a pretty large impact on your ET.
Easier said than done, but a little better reaction time will help too.

Talk to some of our resident drag racers, (Clemster among others) about how to stage, shallow or deep, that will help a little bit also.

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Old 24th March 2012, 00:24   #7
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Quote:
Originally Posted by gsfent View Post
Easier said than done, but a little better reaction time will help too.

Talk to some of our resident drag racers, (Clemster among others) about how to stage, shallow or deep, that will help a little bit also.

Regards,
Jerry
Reaction time really just helps when actually racing another car to get a jump on them as opposed to getting a really great ET where the time begins when your trigger the sensor that starts the time. Shallow staging is good for better ET's and better trap speed.
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Old 24th March 2012, 00:26   #8
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+1 on the reaction time.

Actually shallow staging will result in a slightly higher trap speed because the car covers more distance. Whether to shallow or deep stage depends on lots of variables, but it is not going to make a huge difference in most case, especially with anything that can actually be driven to the track.

For a car like a M5 it won't make any material difference.
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Old 24th March 2012, 00:35   #9
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True lots of variables but they do add up. After all, we are talking tenths and hundreths here.

The launch is the most important. Modulating the throttle and clutch- not spinning the tires too much is key and not missing any shifts and definitely not hitting the rev limiter. Keeping the car straight.

I usually rev up to 1800-2000 rpm and drop clutch for a good hard launch and modulate the throttle until the tires grip.

fun times!
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Old 15th April 2012, 21:28   #10
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Had the inaugural shake down at Lime Rock Park yesterday, weather was perfect. I learned a great deal about the racing line, roll on throttle and braking from my instructor, who placed 2nd in ST2 class TT. I had an unofficial time of just under 1'10", but there's leaps to learn about smooth turn in, transition and track out. It was an intense but rewarding day, here's a quick pic, video to follow.
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