Do summer temps slow your 0-60? Can stock cars manage a 4.8-4.9 in the heat? Post some current times here along with temp and how you're launching the car (traction control off? trans in Sport? just floor the gas or load up engine with brake on?)

Question here. Have you replaced your Heat Exchanger and IC Pump yet?

As far as take offs I take the traction control off.

C55 feedback please

He has a C55 - no IC pump.
Yes, extreme will affect both FI and NA motors.

I don't know if C55's have IC pump and HE.

To launch your car the best way you want to:
1. take ESP off
2. go into speedshift by holding the shifter to the left for a few seconds,
3. optimal gear for 0mph launch is 1st. I rev mine to 1500~1700 rpm. Don't floor it right off, wait for wheels to stop spinning at the same time gently pushing the pedal in, once you feel the wheels get traction, floor the gas and enjoy

Some people will say that when you power brake our cars the esp goes nuts because you press brake and gas at the same time. I tried just flooring it at the strip without powerbraking and my times were 0.1 ~ 0.2 seconds slower.

Thanks for all the launch tips, but what I'm looking for is C55 TIMES. Mine feels slow and I'm hunting for a stopwatch so I can time it, but wanted some realistic numbers to compare to. Anybody?

Depends on the source of the stats (for official times).

Stock (including tires), I'd say 4.7 - 5.2 is the range to aim for. Variability will be due to the driver, driving conditions, and inherent variability in the motor itself due to being hand-built.

Clark's estimate of 4.7-5.2 seems reasonable. Most of what's in the press is in the 4.7-4.9 range with some into the low 5's. I'm guessing that most of those were riun in nice cool temps.

I'd guess that most of those times would be slower on a 90 degree day than on a 50 degree day but I don't have any idea how MUCH slower. Has anyone tried this on a hot day and written down some numbers? If you have a C55 and a stopwatch, could a couple members please pick a really hot afternoon and run some 0-60 times for comparison?

While the data you're looking for is interesting, I think the approach of "a C55 and a stopwatch" isn't going to yield useful information. Too much human variation in the start-stop. See if a friend has a G-Tech timer (or better yet, a GPS-based system like Racelogic) for timing your runs. Good luck - please post your results

you want to run? i'll run ya, my car feels sluggish too.

Published 0-60mph times from the 3 big N. American magazines (C&D, R&T, MT) range from 4.7 to 5.0 seconds.

Published 0-100km/h (0-62mph) from major European magazines range from 5.0 to 5.3 seconds.

My own 0-60mph times based on the Beltronics accelerometer range from 4.70 to 4.90 seconds when it was completely stock with no "brake torquing". This was done with ESP on, transmission in S mode, and simply feathering the throttle for it to roll slightly and then rapidly flooring the accelerator. With this technique, you have to practice a bit, because if you floor it too quickly, you get significant wheel spin and the ESP cuts power.

With a Renntech airbox and K&N filters, my best time was 4.67 seconds (same technique as above).

It may be faster if you press ESP off, but too much throttle too fast still results in time killing wheel spin (the ESP won't cut power in this mode, but the C55's e-diff function will still try to mimic a LSD with the brakes.....this is different from the C32).

I should add that I know these accelerometers may not be the most accurate, but it should be much more accurate than a stopwatch and at least I know my car is functioning close to where it's supposed to be.

try the ecu reset,its on another thread..it might help mate

PC
Really good feedback - thanks! Any of your sub-5 times run in 90F temperatures?

crazeazn - Good to see you're still with us! How's yours running? Has the mid-summer Texas heat slowed yours down at all? Can you still do 0-60 in the 5 second range?

Found a way to calculate temp impact of temp and humidity on performance. Try www.bgsoflex.com/etmphcorr.html

For 1/4 mile runs, increased temperature from 60 to 90 degrees F (keeping humidity at 50% and pressure at 30") would add 0.15 sec to the quarter. If you bump temperature from 60 to 90 and also raised humidity from 50 to 90, impact on 1/4 mile time wouild be about 0.22 seconds.

I've not found a tool for calculating impact of heat and humidity on 0-60 times, but based on the numbers above it's GOT to be small.

There is a hand held meter that a member of this forum has (he drives an SRT-6) We were at the drags and he kept sticking this meter out the window to get air readings. In short the meter crunches all the numbers including the 1/4 times you enter in and it give you a whole bunch of cool data. For example: if I am at 1500ft above sea level this crunches the air and temp number with your times and it tells you how fast you will run and what the elevation feels like. 1500ft with 95temp and 20%humidity blablablabla = 4300ft. and 13.5 1/4mile. IDK how it works but it sure was cool. anyway there is something out there.