The redline difference is the different engine used between the model\facelift years. The 2016 IS still uses the 2GR-FSE. The 2018 GS uses the 2GR-FKS.

As far as acceleration, There is a sweet spot like you said. Usually in the low to mid RPM band where torque is plenty.

 

My 2013 GS350 Lux. Shot yesterday. 1st to 2nd Gear shift.

 

Stock IS350 redlines at 7200? How?

That needle is broken man, get it replaced!

 

Dreamcast I was unaware that either 4GS engine redlined (or shifted) as high as 7,200 rpms. I've never heard that before!

Removing (or increasing) the rev limiter doesn't change the engine's performance without further modifications, especially modifications to increase air flow.


Torque increases up to 5,252 rpms, then it tapers off.

Torque is the force you feel pushing (shoving) you back in your seat on acceleration, while horsepower is the speed achieved at the end of that acceleration.

 

As far as I know only the V8 F engine revs to 7200 RPM stock. If we're talking mods then that's a different story.

 

According to the spec sheet, the 2GR-FSE in the 2016 IS350 redlines at 6600 RPM.

https://pressroom.lexus.com/lexus-20...product-specs/

The spec sheet for the 2016 GS350 lists the 2GR-FKS redline at 6600 RPM as well.

https://pressroom.lexus.com/2016-lex...product-specs/

 

I do need to fix. Monitoring improvements and gains, in Lower Intake Temp and increased intake air CFM. Also back to Flow Bench measures on Intake Manifold and TB. Work in progress, about to fix and move to 7000 - 7200rpm's.

Edit to add: Yes the Cam Timing was Mapped calculated and changed also.








IS350 has a different Transmission ECU program for shifts. Its more aggressive. I have a IS350 ECU. Going to get the Map and load one day and or see if it can be switched on the GS350. The 3rd Gen GS460 guys can use the ISF ECU, plug and play right now. Also the ISF has a retune that can be done and its nice.

 

With the Planetary alignments or something, on this rare time I agree with you.

The 4GS stock does not shift at 72K rpms. Unless....... wheel/tire size changes? But it would have to be a Big change.

 

I misunderstood your reference to timing becoming "more aggressive" in S and S+ to mean that the range of available timing would advance beyond what was available in Normal, which would imply that either the engine makes more than the stated 311hp crank at WOT in S/S+, or less than that in Normal.

 

Not really sure what is misunderstood? Again the words I said are - quotes from Lexus. Maybe I am wrong but.... lets be clear that I did Not say aggressive.

I don't think there is documented about this either way to say no, or yes IMO. I do know that there was a chart on Intro of the New 4th Gen intro and Lexus showed a actual Engine timing map difference of ECO, and Sport. If you don't think its different I'm ok with that. Do you have anything that says it not to show? Can you share what you have that shows its the same? Thanks.

Again look at page 11 and what stated by Lexus. Page 11 about More about - "Alters the Gear Changes, and more Dynamic Throttle Mapping"

https://www.uniquecarsandparts.com.a...013_lexus_gs_2

 

Mistake post.

 

The redline is higher than peak power RPM in case the vehicle is travelling downhills, or has a strong tail wind, or in case the vehicle has been modified with slightly smaller and lighter 18" x 8" symmetric wheels which reduces the rotating mass to actually make the vehicle more efficient and quicker, and finally, the vehicle may have also been modified by stripping seats, head linings, dashboards, door trims, spare tire and tool kits to reduce weight to make the vehicle quicker for track use - these factors collectively result in the engine revving to higher RPM's.


The coil springs deform depending on lbs/ins to give a smooth ride, but it must also resist roll to prevent weight transfer to the outside wheels, resulting in two wheeling which minimizes grip.
Front and rear roll bars make the vehicle less truly independent; in other words, a roll bar that is 100% rigid would turn the front end into a dead axle, and the rear end into a live axle.
With firmer coil springs, less weight transfer, and more grip, the vehicle is able to change directions faster, and having changed directions, the vehicle is also able to hold onto the skidpan for more g's.
The 2013-15's, especially the 2015's have the firmest coils; the 2019-20 is in-between intermediate, while the 2016-18 are the most compliant and smooth riding.

The Sport + Mode AVS changes the valve openings of the shock absorbers [dampers], and this controls the "float" on the vehicle, with smaller valve openings resulting in a less floaty ride with a higher frequency of vertical oscillations resulting in a tiring ride - while larger valve openings allow oil to pass through easily resulting in a floaty ride that has a lower frequency of vertical oscillation.
Without shock absorbers, or without adequate float control - the vehicle would keep rebounding up and down until all the energy is dissipated as heat via the oil, or through intermolecular friction in the coil springs and roll bars.

Many people mistakenly think that firmer shock absorbers like AVS increase resistance to compression, and/or increase the resistance to roll.
Hence AVS shock absorbers don't really directly sharpen the steering nor increase the terminal grip [the coil springs do this] - but AVS shock absorbers does provide a better balance between rebound control and ride comfort.

For the best tracking, we would use 2015 coil springs, with the firmer front roll bars from 2016-, together with the firmer rear roll bar from 2018-, plus the 2015 shock absorbers which were firmest, and the 19" asymmetric wheels and tires.
However, the 19" asymmetric wheels and tires combo which increase the rotating mass may reduce the straight line performance slightly.
This performance package has the heaviest unsprung mass resulting in the worst ride.

In the chart below, as wheels get larger and more profile, acceleration falls, fuel consumption rises, noises increases, and eventually lateral grip actually diminishes...

​

 

I changed the Redline a little to compensate for some Engine Mods and Wheel/Tire size using the D3 Pro Tuner Software. I run 2016+ 19inch Factory F Sport wheels with larger 240-45-19 Tires all the way around.

https://d3performance.net/index.php/...ning-software/

 

The source of my confusion was as follows:

Taking these two posts together, my mistake was that I thought you were saying that the max timing was more aggressive in S/S+, which would result in more power in those modes.

 

It's all good info and conversation to share thoughts. I am not perfect.