ir_fuel

Ok here is the deal:

You have a 996GT3 Cup car with an EVO 4 logger installed. This gives you the standard ECU info (accelerator position, speed, rpm ...) + a 10Hz GPS logger for laptimes and splits.

Considering the fact that the person behind the wheel is no complete novice, but no pro either, and you are just on your own (so no mechanics to finetune god knows what on the car during the trackday. Tire pressures is as far as it goes basically), are there other useful sensors to connect to the logger that are useful for your average DE driver? I think it might be interesting to see the steering angle, and also when applying the brakes, but a brake pressure sensor apparently is overkill on a 996 (since it has ABS), so how would one go on about logging brake pedal application?

I know there are some experts here, so shoot. All suggestions are welcome.

Veloce Raptor

Brake pressure sensor is not overkill, but rather is very useful.
Steering angle.
Latertal & longitudinal G's.

Brinkley

Brake pressure and throttle position are your two keys. Who long where you wide open and when did you brake and how hard.
G's and steering angle are nice but in the idea of KISS brake and throttle arethebest IMHO.

Adam@Autometrics

After Speed and RPM, in order of importance: Throttle (by a wide margin), steering, brake pressure. Brake is clearly important, but in an ABS car, long G (a built-in sensor) gives most of the same information.

fleadh

Personally, I'd rank them in order of: speed, brake pressure, throttle, steering angle, everything else.

With those 4 channels of data available, it'll just be up to you (and a good coach). :-)

-mike

Matt Romanowski

I would go speed (GPS or wheel), Long G, throttle position, steering, brake pressure, then whatever you want.

ProCoach

Agreed. GPS speed and lat/long g from the Evo4 is basic. On the 996 Cup, the EVO 4 can get throttle, RPM and some engine parameters.

With steering angle, you can put a number to understeer/oversteer and with brake pressure you can put a number to brake aggression and release.

I have the new G-Dash add-on for the EVO 4 in stock. Real-time predictive lap and+\- and programmable alarms that you could make work like a MoTeC SLM to show brake pressure and insure you're doing it right. Perfect training tool.

MarkM

VR and Peter, interested in your view here.

I have asked my mechanic about a brake pressure senor for my 99 996. He won't cut into the system to put in the sensor. Is there another way to get this data, or maybe a less intrusive way that will get me 80-90 accuracy? Or is he being overly cautious on this?

winders

Mark,

Get a different mechanic to do the job....

Scott

MarkM

Well its the only thing we disagree about so I'm trying not to turn it into a federal case.

Veloce Raptor

Need more info. Is your brake system 100% stock 996? ABS still in place and operational? Etc.

MarkM

Yes completely stock ABS and TC

IPguy

How do you pull wheel speed off of a 996 gt3? I don't think that it is on the CAN BUS. I am using an AIM XGLOG.

thx

Veloce Raptor

What you might think about doing is putting a pressure potentiometer under the brake pedal itself (or attached to its lever) instead of trying to cut into the fluid lines.

Matt Romanowski

I don't know if it's there or not. I'm in an old no electronics car, so we just put a sensor in for it.