2XLXTN

I have the AWD which I always forget to mention. So I have the 6-speed still.

2XLXTN

Man that is an insane difference. A full second slower? Lort.

JDR76

That 5.0 second 0-60 and 13.6 in the quarter was a C&D estimate. When they did an actual instrumented test, they got 5.6 to 60 and 14 in the quarter.

Road and Track was able to get 5.4 in a RWD 350. The fastest I have found to 60 was Motor Trend, who got 5.3 with an AWD model.

Good summary here:

https://www.0-60specs.com/lexus-is-350-0-60-times/

redspencer

iTrader: (1)

Could you please cite where you are referencing the additional 90 lbs for the facelifted 2017+ Lexus IS? Lexus USA still shows the same 3,597 lbs curb weight figure for the IS350 RWD model.

Correct. The change in gear ratios from the 6-speed to 8-speed transmission had hurt the 0-60 and 1/4 miles for the 2016 GS350. The same impact was noticeable when the 2014 IS350 received the 8-speed auto and was noticeably slower than the previous gen IS350.

Could you please cite the actual test data for these times? I believe Car and Driver had an estimated figure of 5.0 secs 0-60 back when the 3rd Gen IS350 was still in development but it was only an estimate and not an actual time: https://www.caranddriver.com/reviews...t-drive-review .

IIRK, Car and Driver logged a 0-60 time of 5.6 secs with the 2014 IS350 RWD model.

E46CT

I think the big reason for the 3IS slowdown was the weight. 3IS is a porker.
As far as the 0-60, I'll try to dig it up (i already closed the page--had a thousand review pages open) but yes I believe it was C&D as you mentioned. R&T got close to it though.

E46CT

Yeah I hear you many magazines can get slightly different times and depends on many variables, time of day, drivetrain tolerances. no two cars are built alike. I think the trend we're seeing though is that the newer engines don't equate to faster times. That's one of the things holding me back from a 2018 300 or 350--the added weight. This car is heavy enough =/

Burrcold

No way 90 lbs is going to make a full second difference in both 0-60 and 1/4 mile....LOL!

JDR76

I assume this is the Car and Driver article you are referring to. It was their "First Drive Review". You'll note it is an estimate only.

https://www.caranddriver.com/reviews...t-drive-review

arentz07

I presume the estimate was based on the fact that the 2IS was frequently recorded in the low 5's.

https://www.caranddriver.com/feature...s-is350-page-8

ELexis

I too was interested in knowing how the 2GR-FKS achieved the additional 5hp over 2GR-FSE, as well as any other significant upgrades if any, and located this discussion.

I was able to locate some additional information regarding the evolution of the 2GR-FSE to 2GR-FKS;

Interesting fact I was not aware of: A supercharged 2GR-FSE 3.5-liter V-6 that makes 416 horsepower and either 317 or 332 lb-ft of torque is used in the Lotus Evora GT, Evora S and Exige S

The 2GR-FKS still uses the 2GR-FSE engine D4-S twin injection system setup (dual port and direct injection).
The 2GR-FKS is tuned for use of premium fuel, and high-end power (higher RPM's)
The 2GR-FKS has the ability to alternate between Otto and Atkinson cycles for better fuel economy, which appears to be the major upgrade in the transition from FSE to FKS.
(Otto cycle, some of the force during the power stroke goes to pushing the piston down, but more force is produced than needed. That extra force is essentially wasted energy. Atkinson cycle adjustment reduces that wasted energy and by doing so makes the engine more efficient.in the Atkinson, the intake valve closes later, reducing compression).
This is achieved by using the VVT-iW on the intake camshafts (the W denotes " Intelligent Wide" Variable Valve Timing). The wider or expanded valve opening angles increase fuel-efficiency at low engine loads. The engine still uses a variable exhaust valve timing (VVT-i). The engine was also equipped with the coil-on-plug ignition system DIS, ETCS-I, and ACIS
Another significant upgrade noted was self-cleaning fuel injectors that solve the carbon buildup issue that ails many direct-injection engines. The 10-minute cleaning cycle occurs during longer idling periods, such as in a drive-thru line or at a stop light.
Other upgrades include a new reduced-friction oil sump and an exhaust manifold integrated into the cylinder head. This eliminated the exhaust manifold on the engine. The design benefits from lighter weight, the ability to use engine coolant to cool exhaust gasses / EGR circuit is cooled. and a structure that can make the addition of a turbocharger easier. By cooling the exhaust, don’t have to pump any raw fuel into the catalyst to keep the catalyst cool, because it's not heating the catalyst up as much. A side benefit of the design: the catalytic converter is closer to the head, making theft less likely.

Located ddditional 2GR-FKS vs 2GR-FSE discussion here;
https://www.clublexus.com/forums/is-...xus-is350.html

TreysGS460

The FKS motor has an integrated exhaust manifold as well, not sure how that effects the powerband.

I would like to see some engine dynos, but I presume in order to get the extra 5hp, the entire powerband was raised at the cost of low end power, which checks out since the newest IS350s are the slowest ones ever.

What's interesting is that despite the increase in top end power and gearing, the 3IS is still slower than the 2IS in every metric. They used to think it had a better top end but it doesn't unfortunately.

V350

It may also be that the changes to the FKS do more to "free" lost potential and energy than make power. For example, an expert who knew the design team for the 86 once told me that the 86 refresh (before the gen 2) that included a new intake manifold on paper only made 5 hp, but it "freed" more like 20 horsepower in lost potential.

ELexis

You may be onto something! Overlooked the possibility of intake manifold (intake surge tank assembly) being redesigned with by-product being the additional 5 HP. The part numbers are different;

Engine Intake Manifold Part Number: 17190-31320 (Lexus IS 350 LUXURY 2017, 2018, 2019, 2020, 2021, 2022, 2023 / Lexus IS 350 LUXURY F Sport 2018, 2019, 2020, 2023)

Engine Intake Manifold Part Number: 17190-31100 (Lexus IS 350 2006, 2007, 2008, 2009, 2010, 2011, 2012)

Engine Intake Manifold Part Number: 17190-31170 (Lexus IS 350 2012, 2013 & IS 350 LUXURY 2014, 2015, 2016)

** Engine Intake Manifold Part 17111-70140 (2018 - 2020 Lexus LS500 twin turbo)




Engine Intake Manifold Part Number: 17190-31100 (Lexus IS 350 2006, 2007, 2008, 2009, 2010, 2011, 2012)





Engine Intake Manifold Part Number: 17190-31320 (Lexus IS 350 LUXURY 2017, 2018, 2019, 2020, 2021, 2022, 2023 / Lexus IS 350 LUXURY F Sport 2018, 2019, 2020, 2023)

ELexis

Some additional 2GR-FKS V6 information (Perhaps a tune to keep engine running in "Otto-cycle" longer at a given RPM etc. may increase power, but may sacrifice fuel-efficiency for performance
Displacement 3,456 cc (3.5L)
Fuel Injection Direct & Port
Head/Block/Pistons/Timing Chain cover/Upper Oil pan - Aluminum
Head Covers - Resin
Crank/ Rods/Cams/Piston sleeves/Oil pan lower - Steel
Valvetrain DOHC, 24 valve
Bore x Stroke 94mm x 83mm
Compression Ratio 11.8 : 1
Horsepower 278-318 HP
Torque (lb-ft) 265-280 TQ
Some common 2GR-FKS engine problems include:
-High Pressure Fuel Pump issues (2/23/18 - Toyota TSB T-SB-0016-18 "chirping Noise From High-Pressure Fuel pump)
https://static.nhtsa.gov/odi/tsbs/20...30004-9999.pdf
-Potential oil leak is the cam sensor bolt hole. As with the HPFP chirping Toyota issued TSB T-SB-0073-18 addressing the cam sensor bolt oil leak;
-Engine failures appear most common with the Toyota Tacoma. Primary conclusion is that the 2GR-FKS doesn’t have great oiling on steep slopes.
.