Originally Posted by CFG

Originally Posted by Nardoswiss

@Dyno Dynamics

Originally Posted by user33

No opportunities to do additional 1/4 mi runs but, having been reading about different C43 launch techniques, I did get a chance to try some 0-100 runs.

The best results were using the "go on increasing RPM" technique that's been discussed (brake, step on gas and release brake as RPMs hit about 2K ... don't wait, just release brake while RPMs are still rising and don't wait for the turbo-boost to get to maximum). The outside temperature was at 10 deg C (about 50 deg F) for the 4.00 sec result and at 15.5 deg C (about 60 deg F) for the 4.07 sec run, the roads were dry and the altitude is a few meters above sea level. I also turned traction control to the off setting and, of course, was in sport+ mode (with PE on). Even so, getting consistent launches/runs is very difficult in the C43 (stock or RaceChip). If I'd gotten a good launch with my 12.41 sec 1/4 mile run, it would likely have come in at around 12.15 to 12.2.

Car telemetry was captured by Harry's LapTimer and I was also using a Dual XGPS160 10 Hz GPS (though the speed for the timing data comes from the wheel speed, not the GPS).

My 2 best runs yielded a 0-100 time of 4.00 and 4.07 seconds (RaceChip set to Race mode). This compares to a RaceChip disabled mode of about 4.6 seconds, though maybe that would be down to 4.4-4.5 with this type of launch technique.

Since I've switched to winter rims/tires, it's unlikely that I'll get any more performance-run opportunities 'till next spring.

BTW, the RaceChip install hasn't changed the wonderful exhaust sounds that the C43's performance exhaust makes.

Here are videos of the 4.00 sec and 4.07 sec 0-100 runs:
[BTW, the boost PSI seems high ... I assumed the OBD reading was in bars and applied a conversion, FWIW]

Originally Posted by user33

We had a non-rain day and I had an opportunity to do a 1/4 mile test using the DashCommand app and the KiWi3 ODBII-to-bluetooth to capture the car's telemetry. I only was able to do 1 run:
- RaceChip on Race (du-oh!)
- Sport + (PE on)
- Traction control off
- auto-shifting

The good news is that DashCommand app reported the run as 12.41 seconds at 112.2 MPH. That's with a driver, about 3/4 tank of (92 octane, 10% ethanol -- standard for Washington state) fuel and an outside temperature of about 11 deg. C (about 52 deg. F).

The bad news is that I quit the DashCommand app after the run and when I got home and tried to look at the detailed data (expecting it would have been saved), I found that nothing was saved (seriously lame app behavior!).

I still plan to do some direct comparisons with and without the RaceChip enabled under the same conditions and will report the results when I do.

Update: I later was able to recover the telemetry data from my iPhone (using a utility).

I've found that getting consistent launches from a C43 is a significant issue. One will be "great" and the next three, seemingly doing the same thing, will be 1 second slower (e.g., to 100 kph). The launch on this run was mediocre. A better 1/4 mile run is definitely available, with a good launch.

Here's a video of the 1/4 mi in 12.41 sec at 112.2 mph run:
[BTW, the boost PSI seems high ... I assumed the OBD reading was in bars and applied a conversion, FWIW]

Originally Posted by MaverickC43

Most guys compare times not dyno results.
bms I think did a dyno with the jb4 on a 2020 c43

Originally Posted by user33

Still running my RaceChip on our 2017 C43 Sedan daily driver, always set to max performance. If you drive nicely, it appears to slightly improve mileage ... and if you drive aggressively, you'll feel (and can measure) the extra HP/torque. For me, it reduced 0-100 kph times by about 0.5 sec and is easy to uninstall if the car is still under warranty. If you have one just sitting there, why not use it?

Of course if you're looking for maximum performance (I was/am not), then there are other options that will better meet that goal.