I know the regular Twin Turbo 500's put out 415 hp and 440 lb⋅ft. And then the 500h total system output is 354 hp, but I can't find any quoted max torque value. Has anyone out there put a 500h on a dyno? Or found a total system max torque value for the 500h? Just out of my own curiosity.

 

C&D lists LS500h gas engine torque as 257@4900 rpm.

ISEECARS.com shows elec. motor torque as 221.

AWD 4dr Sedan

Drive Train Specs

• Drive TypeA
• 4WD Drive Type-

Steering

• Auto start/stop-
• Battery saver-
• Electric motor battery typelithium ion
• Electric Motor Power Output (Kilowatts)132
• Electric Motor Torque221
• EV battery capacity1.1 kWh
• Hybrid Gas Engine Torque257
• Hybrid gas Engine Torque@RPM4900
• Starter typemotor/generator

That would put total torque at 478.

 

Wow, good digging. I can't imagine Lexus allows 478 ft-lb through the rear wheels. With that number it'd be faster 0-60 than the base 500. I did a little bit of ratio'ing based of these electric motor specs:

Eletric Motor
HP = 177 (132 KW)
TQ = 221

Gasoline Engine
HP = 295
TQ = 257

Quoted Max
HP = 354

So if the max electric motor output when combined with gas is 60hp = that's %17 of total power and %34 of total E-power
So %34 of total electric torque = 75 TQ.

Therefore total TQ (max electric + gas output) = 332 ft-lbs

And based on that total torque value I compared with Lexus's quotes 0-60s times:

Acceleration specs:
LS 500 0-60 = 4.6s
LS 500h 0-60 = 5.1s
11% increase acceleration times

LS500 specs:
HP = 416 (%16 more than 500h)
TQ = 442 (%28 more than 500h)

So I think it's very possible that Lexus allows the combined torque to be above this 332 ft-lbs in order to make it perform closer to the twin-turbo 500. Still would love to see dyno charts for a 500h....

Source: https://lexusenthusiast.com/2017/09/...hnical-review/

Edit: Ok, now I'm thinking there's more torque than that. I used the kenetic energy equation (1/2 mv^2) to calculate what the idealized HP it would be to accelerate a LS500 to 60 mph in the 4.6s lexus quotes, then compare that to the LS500h at 5.1s. So LS500 = 224 HP, and LS500h = 208 HP. About a %7.7 difference in power.

Then I found this dyno chart from Berger Tuning: (for LS500 TT 3.5L engine)


I used this to back characterize the drivetrain losses from the LS500. BHP = 416, WHP = 358 = %14 loss, then for torque, BTQ = 442, WTQ = 433 = %2 loss. So relate that to LS500h. BHP (combined) = 354, WHP = 304.

The thing that's getting me is that power wise it's a %7.7 difference but WHP difference is like %16-17. So now I almost think that the torque value 500h may be higher than the turbo 500 motor to make up the difference.

 

I passed up a deal on an LS500h because it seemed like “too much sugar for a dime.” I know Toyota is a master at building hybrids, but the complicated transmission setup worried me. I live 100 miles from the nearest Lexus dealer. There isn’t a shop around that has worked on one of these.
I also didn’t feel like the gas mileage was that much better than the standard LS500h.
However, if you own one, it is a beautiful machine and I hope it gives you hundreds of thousands of miles of trouble-free service.
https://www.cars.com/amp/articles/i-hypermiled-the-2018-lexus-ls-500h-from-l-a-to-napa-and-it-sucked-1420700112506/