ItzFilyO

I did a few blips and let it bounce off the limiter in Neutral this morning and it did sound really good and addicting.

That's what the limiter is for right? To keep ur engine from over revving.

bclexus

That's why it's there - to prevent engine damage. However, in my opinion I would prefer to hit the rev limiter under load (e.g. in-gear) instead of with the engine under no-load (e.g. free-wheeling) in neutral...because in neutral the engine will have a greater chance of exceeding the maximum RPM threshold whereas in-gear, under load, the RPM increases slower. That said, enjoy the addicting sound!

ItzFilyO

But u can't hit the rev limiter when in gear, it'll just upshift at redline.

bclexus

Exactly! I don't know the exact parameters for the GS 350 (redline vs. rev limiter), but I suspect the rev limiter is set at redline and the transmission shifts a few hundred RPM below redline, or the rev limiter is set a few hundred RPM higher than redline. But, when in-gear the onboard computer upshifts the transmission 'before' the engine hits the rev limiter, because if the rev limiter is hit the limiter stops or prevents the engine from increasing RPM any faster (higher) and the engine power dies-off due to the rev limiter cutting either the ignition or the fuel supply. And, we know this rev limiter engine killing action does not occur when the transmission upshifts.

Edit: I think the GS 350 engine has a redline of 6,600 RPM with the rev limiter set at the 6,600 RPM redline for fuel cutoff. The GS 350 transmission upshifts at 6,400 RPM - or 200 RPM below redline.

Edit (for example): The Lexus LFA engine has a redline of 9,000 RPM with the Rev Limiter set at 9,500 RPM for fuel cutoff - or 500 RPMs higher than engine redline.

rominl

iTrader: (4)

huh? that would be odd

if i put the car in manual mode and set it to say m2 and then proceed to rev it (gun it), the car should go into 2nd gear and then bounce on redline.

that's how all previous lexus work. if it goes into m3 for you, that would be an extremely stupid design

bclexus

Automatic shifting is conducted in the following cases, even when in M mode:
– A “–” shift when vehicle speed decreases.
– When the temperature of automatic transmission fluid and engine coolant drops, shifting is conducted based on a
low oil temperature shifting pattern.
– When the automatic transmission fluid temperature is high, automatic shifting is performed.
– When the engine speed reaches the redline, gear shifting is conducted automatically.

Reference (See Page 71)

bclexus

Many car makers limit the engine RPM when the automatic transmission is in neutral/park to a much lower RPM compared to when the engine is in-gear, under load. I suspect the reason for this is two-fold - (1) so people don't drop the transmission into gear at too-high of an RPM, and (2) so people don't overshoot the engine's redline, which is more likely under a no-load condition.

L99 Chevy
Smart Car
Mopar 5.7 Hemi
Same with some Hondas, and many German cars...

ItzFilyO

My 2014 Accord limiter kicks in at 4K RPM when in P or N. That thing it's a joke. lol

But Toyota never do that, at least the 3 Camrys I've had all bounce at redline.

rominl

iTrader: (4)

that's so bs....

ItzFilyO

U know I noticed that my car shifts funny when cold. When I'm in M mode and try to shift manually, sometimes it doesn't shift! But when all is warm it shifts on demand. lol

Im2bz2p345

Exactly! I don't understand why it's called "manual mode" if the Electronic Control Transmission (ECT)'s ECU is automatically up shifting for you.

I actually brought this up about a year back when I was looking into the IS350 F-Sport (which btw, does the same thing).

Here is an entire thread where we discussed it: https://www.clublexus.com/forums/is-...nual-mode.html

I was back & forth with several people until they FINALLY understood where it would be useful (especially for the IS350 F-Sport, which is more commonly tracked) and how stupid it is.

A good read if you're interested,

~ Im2bz2p345

P.S. - Here is also a more technical piece on the ECT in Toyota vehicles: www.autoshop101.com/forms/h16.pdf

sam430

iTrader: (10)

I've hit the rev limiter while in gear.

praetor

Car won't go into 6th gear when cold is what I noticed. That and when not in ECO mode, the car revs higher and tends to lunge forward hard when you take your foot off the gas.

bclexus

When the car is cold (after the car has been sitting) the transmission will behave (shift) differently until multiple inputs from both the engine and the transmission meet certain parameters. This reduces emissions, and also helps reduce engine and transmission wear.

Shinedown

I have not tried this yet in the GS but for what it's worth my 2007 IS350 would not automatically up shift when in manual mode.