I dug up some of my older dynojet sheets to see what changes had occurred between my older tune and setup vs a revised tune and setup. Both of these dyno graphs were from the same shop but were done many months apart:

1) Older Tune (Ignition Timing Advance at 27.5 degrees and AFR showing 11.5 on the dynosheet) and IS350 setup (F-Sport Intake and Exhaust, PPE headers, OEM midpipes):



2) Revised Tune (Ignition Timing Advance at 30 degrees and AFR showing 13.0 on the dynosheet) and updated IS350 setup (F-Sport Intake and Exhaust, PPE headers, Megan Racing Midpipes):



Note that the WOT pulls on the Old Dyno Graph were done with ECT PWR so the downshifts to 4th gear didn't occur until the 4.5k RPM range. On the New Dyno Graph, all WOT pulls were done with ECT Snow which kept the IS350 at 4th gear at around 3.0-3.5k RPMs.

Peak horsepower didn't increase significantly but Peak torque definitely did.

 

That is good info! Thanks!
Question; does car's data for AFR support that 13.0 graph reading? I ask as anything from 4k up with say 70% to WOT car reports 12.0:1 which IMO is too rich to make good power! I mean, torque is what moves that car!

 

Nope. My datalogs also show a 12.08 AFR whenever I go WOT so I can't confirm whether or not the true AFR at WOT is 13.0 or 11.5 with the revised tune file. I can only confirm that my ignition timing advance had changed from 27.5 to 30 degrees.

 

Does anyone know how do I know/check if my car has the latest Lexus calibration file implemented by your Lexus dealer, as stated by RR Racing website ?

 

any updates since 2019 on your thoughts on rr tune?

 

still works great, no issues regarding it. I haven't been looking at Lexus tunes recently so I don't have any thoughts on the maps offered by tuners, but maybe they could make an extra hp or two depending on your mods. Whether it's worth the extra cost for the custom tune isn't there for me, at least for the 250 platform, 3.5 I'd perhaps consider if you have fbo