|
|
|
#1
|
|||
|
|||
500E 1/8 JAX,FL results
It was a balmy 45-F here in Jacksonville, FL tonight (7:30pm-9:00pm), and I took the 1993 500E to JAXRACEWAY for some 1/8 mile runs.
Tonight I ran 26 PSI Nitto 550R drag radials (225/50R16), ASR OFF, BergWerk's 1st gear start with extended 1st gear shift to 2800 RPM. Reaction 1/8 ET 1/8 MPH 1.091 9.395 76.39 0.684 9.420 76.40 0.821 9.309 76.80 0.815 9.179 76.80 0.710 9.517 73.91 0.627 9.230 77.03 0.704 9.187 77.45 0.670 9.341 75.88 0.668 9.166 77.46 For some reason, none of the slips had 60-ft times. Humbled some Mustang GT's, a Buick Roadmaster Wagon w/LT1 V8 & 3.74 LSD (aka, Caprice "Shamu"), Camaro, and Firebird. A "pulley" changed Ford Lightning was hiting 8.833! Can't wait to try my 3.07 ASR diff . . . :-) neil 1988 360TE AMG 1993 500E Last edited by ke6dcj; 12-03-2003 at 07:57 AM. |
#2
|
|||
|
|||
NICE!
I'm curious .... why is your 1st gear shift point set so low ... wouldn't a higher rpm shift point yield a better time? What's the ETA on the 3.07s?
__________________
1992 500E (Daily Driver) 2004 Porsche RUF 955 Dakara 550 |
#3
|
||||
|
||||
Good job man!
These are good runs, and you showed some good improvement in your reaction times and ET/MPH. You have a strong car, and did well considering the temps. Did you try icing your intake? It would have taken 1/10 of a second off your times. For reference, my best times in the 1/8 are 9.050 and 9.071, at 78.15 and 78.40 respectively. Cheers, Gerry |
#4
|
|||
|
|||
Gerry- what RPM do you shift or let your tranny shift out of 1st gear?
I launch at about 1200 RPM, since the track is kind of crappy/slick to reduce wheel spin. No ice. Using CarTest software, the projected best 1/8-mile on stock tires is 9.42, mine was 9.10. Moving to a 3.06-diff, projection is 9.39. However, if I use proportional modeling against my actual figure, I get 9.07. We shall see . . . BTW: are you suppose to "warm-up"/spin drag radials or not? I've heard you shouldn't . . . :-) neil Last edited by ke6dcj; 12-03-2003 at 08:38 AM. |
#5
|
||||
|
||||
Cool stuff Neil...how do you like the grip with them Nittos?
That track in Jax is close to sea level right? Here's one of best runs from this past August up at New Hampshire Dragway (right on the coast)...a very humid 92 degrees in the early evening. R/T .620 60' 2.171 1/8 9.058 mph 78.37 1000' 11.768 1/4 14.045 mph 101.10 I beat all but one of the new and old Audi S4/6s I was with...the one I lost too had the 450 HP KO4 turbos upgrade... he never made it home; fried his clutch. I ran stock 17" EvoIIs with street tires (Sumitomo HTRZIIs)...everyone else had street tires too. My motor is basically stock but very, very fresh and runs quite strong. I launch like this....put the car in 1st gear then back in D, pedal to the floor after the last red lite, ASR not unplugged (but made sure I lined up on the less slick part of the lane). I'd like to add that with the cooling fans on...the car was 1/2 sec slower...about even with them modded Audis. |
#6
|
|||
|
|||
Sweet runs Neil! You mentioned you took a Camaro and Firebird, were they late models? Reaction times are getting better, is that due to your technique, tires or a combination of both.
Jim, S4's and S6's Damn! Question for both of you, did anyone make any comments about the carr and were there any confused faces? Nice job schooling the crowds professors.
__________________
Afshin Current: 02 C32 AMG Previous: 92 500E 84 190E 2.3 5 Spd |
#7
|
|||
|
|||
The Camaro and Firebirds were all early-to-mid 1990's models, I don't think they were current.
Reaction Time (R/T) was better since I'm more comfortable and getting more familiar with the "Christmas Tree" (aka, lights). It's all driver, not the machinery/tires/etc. Yes, a lot of drivers were amazed. The line-men would see the Benz, and say, "I can't believe how fast that car is, is it stock?". When I say yes, and it's 10-years old, they shake their heads in disbelief. One guy in a Pro/Stree rod asked if I had a Hemi, and just said that's a comfortable way to drive fast. :-) neil |
#8
|
||||
|
||||
Thanx Afshin...it was a "Street Nite" there and there were a ton of ricers and muscle cars. I was with a slew of Audi fans and we all made it a point to line up together....they knew the car was pretty quick but many folks were surprised with the Benz and came up to check it out. I forget how most folks don't have a clue about the 500E. They all thought it was some crazy modded car with the bulging fenders and big V-8.
But the 450 Hp S4 got the most attention...4 wheel burn-outs are COOL !! Except when you need a flat-bed to take you home at the end of the nite. |
#9
|
|||
|
|||
Warmup DOT drag radials?
BTW: are you suppose to "warm-up"/spin drag radials or not?
I've heard you shouldn't . . . :-) neil |
#10
|
||||
|
||||
I've heard you only do that if your car has a ton of torque and spins tires easily ....but I'm not a drag regular that much.
|
#11
|
||||
|
||||
With my E500, I use a "dual burnout" technique. I found through experimentation that warming up the tired does in fact help with launches (this is with street tires).
Another thing that helps is reducing pressure to the 20-21 PSI range. The dual burnout technique entails a 3-5 second burnout in the "burnout box" which at PIR has a thin layer of water/ammonia in it spread by a guy with a broom. After doing this, I pull up toward the start line a couple of car lengths, and give it another 3-5 second shot to clean off the tires and get them properly warmed up. Then pull up to the start line. For starts, I typically will shift down to first gear, and then back into second. ASR is off, of course. I will typically at the first/second yellow, begin revving the engine holding the car with the brake. This revs it up to the 1,500-2,000 range. At the third light I release brake and floor it. I then manual shift once the car goes a few needle widths into the red zone. Shifting is important, not letting the car do it by itself. If controlled properly with manual shifts, one can get more out of the engine. Anyone beat a 14.02 second quarter on the stock E500-500E -- ? Cheers, Gerry |
#12
|
||||
|
||||
Hmmm....I think the 500E tranny shifts quicker, smoother and at the proper points by itself better than any human ever could....but that is certainly debatable.
I also never heard of a 'stock' 500E breaking into the 13s...but I'm sure someone out there says they did in their car...LOL. When I first got mine bone stock with 120K on it...it would do low 14.1 s all nite long. What do the 6.0 litre RennTech cars pull? Anyone know? |
#13
|
|||
|
|||
Gerry, et al.,
For the 1/8 mile, I'm wondering whether or not a 3.07 or a 2.24 diff would be better for lower times? If the stock diff (2.82) requires one to be in 3rd gear at about 69/70mph, is it: a) better to be at higher RPM when shifting into 3rd (e.g., 3.07 gearing), or b) stay in 2nd gear all the way to the finish (e.g., 2.24-> 2nd/80mph)? :-) neil Below are speedos with the gear mark-dots for the following diffs in order: 2.24; 2.65; 2.82; 2.87; 3.07; 3.27 1993 400E: 2.24 1994 E320: 2.65 1993 500E: 2.82 1991 300E: 2.87 1989 300E: 3.07 1988 300TE: 3.27 Last edited by ke6dcj; 12-04-2003 at 04:06 PM. |
#14
|
||||
|
||||
Obviously the lower gearing (3.07) is going to be beneficial.
My reason for manual shifting is not speed of shifting, it's all about control, and the ability to force shifts at optimal points. I have tested this on my 560SEC, 300SEL 6.3, 450SEL 6.9 and now E500, and manual shifting always results in faster times. Generally 0.1-0.2 seconds faster. You can simply hold the car in gear longer and/or shift at the optimal points. That being said, the E500 does shift on its own once the needle gets into the red zone far enough. It is built to do this in order to protect itself. But several factors determine WHEN this shift is done. I'll stick with manual control. I have run many drag runs with auto and manual control, and manual has proven to be faster. If you look at the times I posted on 500ecstasy.com, you can see that my technique resulted in close to a 0.5 second reduction in times over the course of the weeks. Technique (among other things) was a significant element of this equation, and early testing was done with manual control. The best time I ever got with automatic shifting was a 14.3. Got bloody close to a 13.9 at the end of the season, and I definitely know my car "has the balls" to do it -- I just didn't have the time to pursue it -- the track closed, and I didn't want to sit around the track every Friday night until 1AM! I found that waiting about 30 minutes in between runs is best, allowing things to cool down (ice on the intake box helps too). Back-to-back runs never produce record times. Cheers, Gerry |
#15
|
|||
|
|||
gerry,do you have any idea what happend to 500ecstasy.com? Tried going there for a few days now and hasnt worked...
__________________
1993 400e Charlotte |
Bookmarks |
Thread Tools | |
Display Modes | |
|
|