OGRacing

iTrader: (1)

The 14's wouldn't be good match with the RC1 tire. heck if you have anything over 250hp i would step up the compound. You should have tried the 01. you wouldn't touch anything else after that.


car looks great BTW. love the seats!

emilio700

iTrader: (3)

Thanks for the input. Not being a PFC dealer, I deferred to the vendors suggestion. Ryan initially recommended PFC01's I think. I asked if there was anything a step down. All he had in stock was the PFC14 so I chose it blindly. Ryan thought it would be OK. Turns out I should have stuck with the initial choice. In any case, the car has XP12's in front now and all is good.

emilio700

iTrader: (3)

New favorite pastime is posting pics of the project ND.

Blackbird

I'm totally fine with your new favorite pastime activity.
Carry on.

EO2K

iTrader: (37)

I know its just personal preference, but I liked the exhaust you guys built for the car. Very much more than the other stuff people were running at MRLS. I don't know what that ND pace car was running but I'm not a fan.

I saw Keith Tanner humping around a stock ND muffler at one point, that thing does NOT look like a lightweight.

emilio700

iTrader: (3)

The OEM midpipe is light but the muffler is pretty heavy and large. We ran three resonators in line. A huge one in the 2.5" midpipe and two smaller ones looped in back. Too loud for my taste so it's getting a muffler in back to replace the two small resonators. Our header has no cat and we used a short 2.5" metal core cat in the midpipe. ECU runs closed loop everywhere so we kept the factory WBO2.

EO2K

iTrader: (37)

It may have been loud, but it was a good loud. You guys were under 92db so it obviously works. Then again I didn't ride in it and I don't have to drive it so my opinion isn't worth much in that regard.

I'll have to poke around the 949/SpM youtube channels and facespace pages tonight and see if you guys have any in car video posted.

z31maniac

Out of curiousity, did you do any data logging regarding oil temps/psi?

emilio700

iTrader: (3)

Just started to at the end of the day when we were short shifting. We'll publish data in a few weeks. For now, I can state unequivocally that track ND's must have an oil cooler.

OGRacing

iTrader: (1)

the only cars that need oil coolers, are cars with oil temperature gauges.

emilio700

iTrader: (3)

Or native oil temp sensors that can be logged, as we did. Matt at OVTuned logged it while riding with us on track. Aim is still fine tuning the config file for the ND so we had a bunch of other channels, but not oil temp logged. So we can log plugged into the ECU now or stored in the Aim once the config file is updated.

aidandj

iTrader: (5)

Didn't you also say that the ECU goes into some sort of dramatic limp mode.

z31maniac

That's what I figured. Just curious since the BRZ has also been shown to absolutely need an oil cooler for track work.

Most modern ECUs do. When you get super high oil temps, the psi drops dramatically.

emilio700

iTrader: (3)

Yup, cook the oil enough and it limps. Thus the reason we were short shifting.

We also learned the DSC can not be entirely deactivated. It appears Mazda didn't allow for high grip tires and really high yaw rates. At least I think that's what we experienced. We will know more once we have a proper test day with Matt there and our Aim getting all of the CAN bus channels. We tried reorienting the yaw sensor on the rear bulkhead but only succeeded in disabling the ABS and flat spotting the RF tire. The car has a G sensor too so I think the yaw sensor is only a three axis.

In any case, sky high oil temps along with a bunch of DSC events and the ECU eventually says "party is over".

We're working on it.

Dunning Kruger Affect

That makes me really curious what the sealed Mazdaspeed/Bosch supplied ECU is holding secret-wise.

aidandj

iTrader: (5)

Sounds like a whole bunch of stuff turned off.

EO2K

iTrader: (37)

It sounds like the datalogging options, beyond the drive-train parameters, are going to be phenomenal.

emilio700

iTrader: (3)

Yup

Steering angle
Four wheel speed sensors
Yaw angle
Lateral G
Brake line pressure
Oil temp
Oil pressure
TPS commanded
TPS actual

..more

all native and available through the CAN bus. I haven't mentioned it here yet but we're now and Aim dealer and have the first Solo DL with ND config file in our car. The file is a WIP and should have all eleventy million channels in a few days. So yeah, plug the Solo DL into your OBD 2 port and log everything.

aidandj

iTrader: (5)

Why would these not match up? Is there a table that turns DBW throttle position into what the ECU thinks it should be?

(I know nothing about DBW throttles, now I'm going to be stuck reading about it for the next few hours)

Dunning Kruger Affect

The first thing that comes to mind that is like "yeah, duh" is the safety one (think left foot braking). In the Mazda2, if you depressed both the gas and the brake simultaneously, the ECU would only allow 25% of the throttle value, so 25% throttle becomes 6.25% throttle. Reason is like the unattended acceleration garbage that was in the news, and it's a super easy fix to make sure that the brakes can always overpower the motor.

From the poking that OVTune has done (along with Goodwin + Emilio), there are a bunch of fail-safes based on all of the sensor readings. I know that OVTune went into some detail about tip-in knock detection over on mnet a few weeks back. Thousands of interconnected maps.

Thousands.