EV general discussion

dLockers said:
I think folk are just dubious at the outlandish claims
Click to expand...
Like I said. When was jpaul or journey an authority on anything engineering.

I’m dubious at the counter claims as they are based on nothing… well vitriol of keyboard hero’s. And that’s worse.

You seem to be the kind of guy in the pub that one day would be sound and chatty, the next day you’d get a punch in the face. :D
 
Last edited:
well I was thinking of earlier aero posts - tesla S using 150W/mile against drag @70 which takes some 250W from the battery,
do I see drag factor and frontal on a Range Rover bettering those, even with a taycan type gearbox & excellent regen, strewamlined body.
(WLTP cycle average is much slower on average, but it's extra urban that counts ?)

jpaul said:
On aerodynamics, despite the constraint of a ICE platform mercedes have managed competive cd and drag factors versus m3 with its 0.23cd and small frontal area.

The tesla S versus merc CLA250 had 14hp vs 16p @70mph to comabt drag so merc was only 14% worse, which should be indicative of range difference on m3 vs eqc too
Click to expand...
 
jpaul said:
well I was thinking of earlier aero posts - tesla S using 150W/mile against drag @70 which takes some 250W from the battery,
do I see drag factor and frontal on a Range Rover bettering those, even with a taycan type gearbox & excellent regen, strewamlined body.
(WLTP cycle average is much slower on average, but it's extra urban that counts ?)
Click to expand...

That’s terrible road load efficiency if 250W only 150kW gets to the wheels. Taycan gearbox as nothing to do with normal efficiency either, it’s just extra mass.

Just stop second guessing stuff with statements that actually end with question marks, I can’t really understand what the above quote is really saying. Would make for more valued conversation rather than fact outbursts we tend to see.
 
Ah the internet, where grown men can become children again

Kia/Hyundai achieves good efficiency with the Kona/Niro but as soon as the cars get largers/heavier it can't get over 4 with the EV6/Ioniq 5

So we'll see what happens but let's be honest everyone part from Jonny will be stunned if a Velar sized JLR product achieves 4mpkWh :D

The i Pace is more like 2-2.5 IIRC so it would be an amazing improvement.
 
The only person working on EMA is me though. :p I get sensitive to wide boys discrediting, with loose statements, on what I’ve been working for the last 3 years. That’s all.
 
Jonnycoupe said:
Just stop second guessing stuff with statements that actually end with question marks, I can’t really understand what the above quote is really saying. Would make for more valued conversation rather than fact outbursts we tend to see.
Click to expand...

​

DGX H200 is dropping shortly, that'll ramp up the training model no end, he'll be fully conversational soon, keeping you busy for days :D :p ;)
 
Last edited:
jpaul said:
well I was thinking of earlier aero posts - tesla S using 150W/mile against drag @70 which takes some 250W from the battery,
do I see drag factor and frontal on a Range Rover bettering those, even with a taycan type gearbox & excellent regen, strewamlined body.
(WLTP cycle average is much slower on average, but it's extra urban that counts ?)
Click to expand...
So much math fail. At 70mph you are covering a mile in 51 seconds. So 150W/mile would be 150/0.85 =176Wm from the battery.

Where’s the 250W come from in your sums. For a start it’s energy not power
 
sandys said:
a 4.5m/kwh SUV would be awesome
Click to expand...

I think we all agree there. Smaller battery (lower cost) or more range. Either way it’s win win win.

The discussion point is more that no one has got anywhere near that in the real world in a vehicle the size of the Velar, particularly where range actually matters (E.g. driving 100 miles down a motorway with some lower speed miles at either end) but that’s WLTP at the end of the day.

However when you actually read the article, the quotes used didn’t look to be specific to the Velar and presumably cars like the XE will be going electric in the very near future and those kind of numbers are not unreasonable for a car that size. I’ve seen 5 miles/kWh on a reasonable run in my model 3, my average over 18k is hovering just above 4.

Perhaps unhelpfully for JLR the journalist linked what the platform is capable of with a specific vehicle which probably will not achieve those numbers because it’s a big lump of a car.
 
@Simon I'd taken the links attributed 14hp for drag @70 => 10.3KW => 150W/mile


Jonnycoupe said:
That’s terrible road load efficiency if 250W only 150kW gets to the wheels. Taycan gearbox as nothing to do with normal efficiency either, it’s just extra mass.
Click to expand...
when you put the 150 in the context of other losses though eg V
but - with the gearbox you are both increasing motor efficiency at lower speeds by having a higher rpm, and also keeping it in the torque & low friction loss zone for higher cruising speeds.

good breakout losses diagram I'd seen
52942710255_f3d960aebc_o_d.jpg
 
Last edited:
Autocar article is correct as it can be ustilising press release material. XE won’t exists soon as per the Reimagine strategy announcement last last month and direction the Jaguar 4 seater GT.

Things have moved on significantly, silicon carbide inplace of IGBT in inverters massively lifts efficiency aswell as much better control and management of all heat present in a car. It’s exciting increment gains that all add up. Taycan 2 speed is to meet expectations of high speed autobahn use whilst allowing impressive launch as expense of cost and weight. It’s a choice, not the solution to all.

Nothing like jpauls ladybird “my first EV” picture.
 
Last edited:
dLockers said:
Oh aye lad. You'll save about 200 quid a year if you buy this £80k car.
Click to expand...
I think you are missing the point TBH. lots of people pay 80k on a new car. not something I would ever do, but I am glad people do as someone has to take that 1st 3 year new car tax so people like myself can get a more affordable car.
IF people are going to buy £80k cars I would rather they were EVs or at least hybrids.
 
I would rather it was spent on a glut of Emiras bringing the price down to be honest :D wasting it on bloody 80k BEVs, yawn :p
 
Last edited:
You must log in or register to reply here.
Back
Top Bottom