GX460 - Top end struggles
03-23-19, 08:36 PM
#16
Lexus Champion
i think there’s just too many factors at play in this thread. Others can live in areas with higher elevation, past/current experience with faster vehicles or just a poorly maintained GX. The mixed answers in this thread tells us that. Toyota keeps their engines underpowered probably for reliability.
03-23-19, 08:38 PM
#17
they don’t advance for a reason. Some of us like the GX for what it is, old design and reliable but slow. The GX is getting a refresh soon.
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brutus27 (10-19-21)
03-23-19, 08:46 PM
#18
Lexus Champion
Last week wife's small German car had an oil leak out of the blue. It cost not a dime, otherwise labor charge alone would've cost ~400.00. For
two days down time she was given brand new loaner.
03-24-19, 06:45 AM
#19
Incidentally, I did find a way to improve my daily fuel economy by just a little bit: Go into Settings and turn off the automatic air conditioning. Damned thing runs all winter if you let it (and yes, I know that you do want it for defrosting).
03-24-19, 07:31 AM
#20
For some reliability is number one issue, for some it is not. When I buy a car with some known reliability issues I get extra extended warranty.
Last week wife's small German car had an oil leak out of the blue. It cost not a dime, otherwise labor charge alone would've cost ~400.00. For
two days down time she was given brand new loaner.
Last week wife's small German car had an oil leak out of the blue. It cost not a dime, otherwise labor charge alone would've cost ~400.00. For
two days down time she was given brand new loaner.
03-24-19, 07:58 AM
#21
Lexus Champion
There is a lot to be said for an engine designed to put out less than 70 bhp/liter. And when it's a big one like the 4.6 liter V8, you end up with an engine that barely has to work to give a driver of a big SUV enough power along with ridiculous longevity. BMW, Mercedes, etc.--they like something more approaching 100 bhp/liter. There, you're talking more problems along with more performance. In a big SUV that is really used off-road that doesn't sound so wonderful. "Fuel efficient and snappy." Bah humbug (for the GX, anyway).
Incidentally, I did find a way to improve my daily fuel economy by just a little bit: Go into Settings and turn off the automatic air conditioning. Damned thing runs all winter if you let it (and yes, I know that you do want it for defrosting).
Incidentally, I did find a way to improve my daily fuel economy by just a little bit: Go into Settings and turn off the automatic air conditioning. Damned thing runs all winter if you let it (and yes, I know that you do want it for defrosting).
03-24-19, 08:12 AM
#22
Lead Lap
For what is out there these days in terms of engines the 4.6L in the GX is certainly outdated, Lexus knows that. They no longer are pursing NA V8 engines to put into vehicles, and have gone FI V6 in the LS500. Same is expected with maybe electrification on the new 300 series chassis for the 2021 LX/LC. So when and if the GX is not refreshed but redesigned with a new chassis, expect the same.
Plus reliability is the game Lexus plays, and if FI was unreliable I wonder why they launched a high sales lineup of FI 2.0 motors in the IS,GS, NX, and not for sale in NADM RX....
In regards to the OP, did you try manual mode?
Plus reliability is the game Lexus plays, and if FI was unreliable I wonder why they launched a high sales lineup of FI 2.0 motors in the IS,GS, NX, and not for sale in NADM RX....
In regards to the OP, did you try manual mode?
03-25-19, 06:54 AM
#23
Pole Position
I find the GX deceptively fast and can go 70mph effortlessly. Almost too effortlessly. The times that I do let off the gas when I see a cop, I actually wish it loses speed quicker, but maybe not since I dont want to give the impression that im braking.
03-25-19, 06:54 AM
#24
Well, it's smaller than 5.7, which would seem to be the next step up. Put it this way. Let us know in the future if you EVER see a non-exotic, passably reliable SUV less than Land Cruiser size with a bigger one. I drive what I like, too. Sheesh.
03-25-19, 01:05 PM
#25
Pole Position
Thread Starter
Didn’t try manual mode, I use manual extensively when the roads are not plowed in snow. Keeping in a low gear helps a lot.
For what is out there these days in terms of engines the 4.6L in the GX is certainly outdated, Lexus knows that. They no longer are pursing NA V8 engines to put into vehicles, and have gone FI V6 in the LS500. Same is expected with maybe electrification on the new 300 series chassis for the 2021 LX/LC. So when and if the GX is not refreshed but redesigned with a new chassis, expect the same.
Plus reliability is the game Lexus plays, and if FI was unreliable I wonder why they launched a high sales lineup of FI 2.0 motors in the IS,GS, NX, and not for sale in NADM RX....
In regards to the OP, did you try manual mode?
Plus reliability is the game Lexus plays, and if FI was unreliable I wonder why they launched a high sales lineup of FI 2.0 motors in the IS,GS, NX, and not for sale in NADM RX....
In regards to the OP, did you try manual mode?
10-18-21, 10:40 AM
#27
I can't say I have noticed this behavior or forgot about it since I have been running Pedal Commander. I'm normally around 78MPH on stretches of I-90 here in WA state. Only time I found issues was driving this speed with 40-45MPH headwinds. I slowed down for that. Vehicle does get especially dirty on the rear door. PC is simple to install and remove and money back guarantee if you don't like it.
In my experience my GX can cruise all day at 90mph pretty effortlessly.
Foot to the floor it'll pull very strong all the way up to the limiter. Fuel cut at the limiter is fairly abrupt though.
But yeah it's a huge brick on wheels. You've gotta use more fuel to go faster.
Foot to the floor it'll pull very strong all the way up to the limiter. Fuel cut at the limiter is fairly abrupt though.
But yeah it's a huge brick on wheels. You've gotta use more fuel to go faster.
10-18-21, 04:05 PM
#28
"Inverse square law" and the 'Brick' come into play at high speeds. When considering wind resistance, it takes 16 times more power for the BRICK Lexus GX to travel at the same speed as a more aerodynamically efficient vehicle with 1/4 the wind resistance.
There would be the same differential in power when the fuel is removed and wind slows both vehicles. This would account for the "quick slow down sensation" of the GX when fuel is removed at high speed.
Wind resistance (power) is exponential not linear. If 10HP is required to travel at 100MPH into a given wind it would require 10HP x 10HP = 100HP to travel at twice the speed, 200MPH. Power would need to be squared to overcome 2 times the wind speed.
There would be the same differential in power when the fuel is removed and wind slows both vehicles. This would account for the "quick slow down sensation" of the GX when fuel is removed at high speed.
Wind resistance (power) is exponential not linear. If 10HP is required to travel at 100MPH into a given wind it would require 10HP x 10HP = 100HP to travel at twice the speed, 200MPH. Power would need to be squared to overcome 2 times the wind speed.
Last edited by NiteDipper; 10-18-21 at 04:17 PM.
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MrTorgue (10-18-21)
10-18-21, 04:21 PM
#29
"Inverse square law" and the 'Brick' come into play at high speeds. When considering wind resistance, it takes 16 times more power for the BRICK Lexus GX to travel at the same speed as a more aerodynamically efficient vehicle with 1/4 the wind resistance.
There would be the same differential in power when the fuel is removed and wind slows both vehicles. This would account for the "quick slow down sensation" of the GX when fuel is removed at high speed.
Wind resistance (power) is exponential not linear. If 10HP is required to travel at 100MPH into a given wind it would require 10HP x 10HP = 100HP to travel at twice the speed, 200MPH. Power would need to be squared to overcome 2 times the wind speed.
There would be the same differential in power when the fuel is removed and wind slows both vehicles. This would account for the "quick slow down sensation" of the GX when fuel is removed at high speed.
Wind resistance (power) is exponential not linear. If 10HP is required to travel at 100MPH into a given wind it would require 10HP x 10HP = 100HP to travel at twice the speed, 200MPH. Power would need to be squared to overcome 2 times the wind speed.
10-19-21, 06:59 PM
#30
In my experience my GX can cruise all day at 90mph pretty effortlessly.
Foot to the floor it'll pull very strong all the way up to the limiter. Fuel cut at the limiter is fairly abrupt though.
But yeah it's a huge brick on wheels. You've gotta use more fuel to go faster.
Foot to the floor it'll pull very strong all the way up to the limiter. Fuel cut at the limiter is fairly abrupt though.
But yeah it's a huge brick on wheels. You've gotta use more fuel to go faster.
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