*sorry if the pics are too big*
So i'll start this off by saying that the dyno session wasnt a 100% success because of the "normal" version of the vfTuner software is so feature limited. There is a pro version that my tuner will get when the next big update releases. Either way I did walk away with a tune to show potential. We had to use obd fusion to log because the normal version of the software doesnt even allow you to log knock feedback. This was definitely more of a learning experience to see how these cars react. If there are any maps you guys want to see from the stock ecu tune. let me know and i'll attempt to find it and post what it looks like here. We ended up running out of time playing around with everything, will return later on in the future to finish up the tune.

There are plenty of cool things in the software still. You can mess with the transmission and change the shift points, torque converter lock, how fast the shifts are. Here is an example of what it looks like based on accelerator angle.

So one thing that I thought about was leaving that secondary intake open. It has been discussed before in this forum plenty of times. So I asked my tuner lets see what happens when we unplug vacuum line. Well, that caused a check engine light. Then we found out that in the software there is actually a parameter you can change to open the intake. We decided to try opening it at 2000 rpm on his tune. Here are the results of requesting the flap to open earlier. These two dyno runs were done back to back within 5 minutes of each other. Flap closed (red) flap opened(yellow). These dynos were done on a KCLV of 17.8 under 4k rpm and 17 above 4k rpm in 5th gear. (was easily able to get kclv back up to 20s after driving around). Unfortunately we ran out of time and he had another customer waiting. That was the last run of the day and we did not get a chance to make improvements to the tune with the intake opening earlier.



Currently back on stock tune for the time being. When my tuner gets the Pro version I will return to build on top of the custom tune. He has a few ISF guys waiting in line too. Switching tunes only takes about 1 minute as well. Once again, if anyone wants to see any of the maps, I can try and find it and post a photo.

 

So your back to back dyno is telling that if you open the flap at 2000 rpm, it gained you low end torque compared to when it opened at 3600 rpm in OEM setting? That is interesting.

 

Yup seems to be the case on the custom tune. Also, if I remember correctly, when we logged the absolute throttle, the throttle does not open completely, until that flap is opened up. In his tune he did add more fuel earlier if I remember correctly. maybe the combination of the throttle fully opening sooner and more fueling did the trick

 

OK thanks. That makes sense that there is a custom tune with it since the torque on OEM tune feels so much better with the flap closed below 3600 rpm. Looking forward to more results.

 

So did the car pick up Torque but then lost HP?

 

Yup seems like the case. After we changed when the flap opened we made no changes to the tune, so i hope with some adjustment the HP would be higher. It's A LOT more fun driving around town with the flap opening up earlier but one downside is that cruising on the highway my rpms were around 2k rpm. The the tiniest throttle would make that loud induction noise. May just change it to 2200 or 2300 rpm instead for highway cruising. Whenever I get the tune adjust I think I will continue going forward with the flap opening up earlier and share the end results

 

Where are you getting the tune from and is limited to certain year RCFs?

 

limited to ‘15 and ‘16 right now but they claimed to be working on unlocking 17+ Hopefully in the next big update. I got the tune done at Xact Dyno in Tempe.

 

yeah that is probably not gonna happen... RR have been working for 3+ years to unlock 17 models and up and are unable to do it.
Only reason why 15/16 are Tuneable is because LEXUS published the Files for them (Training purposes).