How Close is Simracing to Reality in 2024? Le Mans Comparison


The 92nd running of the 24 Hours of Le Mans was one of the most competitive events in recent history. Kevin Estre's incredible lap in his Porsche 963 Hypercar was enough to put him on pole. But which simulator is best to emulate Estre's lap time?

The simulators that we will be using to compare lap times are Le Mans Ultimate and iRacing. Both simulators have modern iterations of the laser-scanned circuit, but do they produce similar lap times?

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Porsche 963 heading down towards the Dunlop Chicane.

Sector One​

Starting in sector one with the Dunlop chicane. There is a massive difference between the two titles and how they portray the chicane. In iRacing, you can attack the curve with real aggression and cut quite a considerable amount out of the apex. Compared to Estre's pole lap, these cuts do shave some time off but not enough to make it considerably faster than real life.

Le Mans Ultimate is the direct opposite of iRacing's version with small boards and bollards on the inside to mark the track limit. If abused, you will be met with a nice time penalty to carry.

When leaving the Dunlop Chicane, the input on Marcus' fast lap on Le Mans Ultimate and Estre's inputs are almost identical. The car slides in exactly the same way and is corrected and straightened out perfectly. iRacing does not get to have the same opportunity to prove itself with the two racing lines being very different after cutting a lot more of the apex out.

Dunlop Chicane.png


Moving onto Ralentisseur Dunlop or the Esses next. The major talking point from this notoriously fast section of the Le Mans circuit is the speed difference. In the real lap, Estre is averaging around 15 to 20Kph slower than in iRacing. Le Mans Ultimate is also around 15Kph less and both are now eight-tenths behind iRacing's current pace.

For the final sequence of sector one, it's down to Tertre Rouge. The major difference again singles out iRacing. The kerb on the left-hand side is used as more of a track limit than a physical deterrent to drivers. whereas in Le Mans Ultimate, and especially on the real track, that kerb is vicious and can potentially spin you or at the least damage your car if you use it too much.

Sector Two​

Heading down to the first chicane on the Mulsanne straight, the speeds contradict what we learnt in sector one. Estre's top speed was 325Kph, Le Mans Ultimate showed 334Kph and iRacing's reading was 324Kph. Just one 1Kph off of the real car!

iRacing Tetre Rouge.png

iRacing's flat curves at Tertre Rouge

The story of the first chicane is very similar to the Dunlop Chicane from the start of the lap. iRacing's non-existent kerbs allow a much tighter line and lack of harshness when at the limit of grip. The real lap and Le Mans Ultimate's lap show that you have to respect the kerbs and dance around them to find the ideal line for the most grip heading down to the second chicane.

The second chicane is the same story of the kerbs affecting the line within iRacing. Heading to Virage De Mulsanne, is hard to compare entirely accurately. Estre was held up by an LMP2 car on the entry, compromising his line. However, he didn't appear to lose any time. The new exit kerb is fantastically modelled in Le Mans Ultimate to create a punishing track limit for drivers just like in the real race.

Sector Three​

At the kink before Indianapolis, you can get away with just a touch of the brake before slamming on the anchors in iRacing. Le Mans Ultimate requires you to smoothly apply a much greater amount of force at the kink before braking equally as hard.

Indianapolis.png


All three versions of the lap are then nearly identical heading through the ninety-degree right-hander towards the iconic Porsche Curves.

From the left-hander to the right-hander, Estre's lap and the Le Mans Ultimate lap are almost identical again in their inputs and racing line. Remember, this is almost three minutes after starting the lap!

The average speeds through the Porsche Curves surprised us considering how close the real lap was and the Le Mans Ultimate lap. The real lap sat at 254Kph, iRacing was at a staggering 267Kph and Le Mans Ultimate showed a slower 242Kph.

Porsche Curves Speed.png

Average speeds across all three comparisons through the Porsche Curves.

Throughout the sequence, the kerbs play the most pivotal role again. Mounting the kerbs in Le Mans Ultimate will unbalance the 963 and could put you in the wall at incredible speed. In iRacing, you do not have the same level of worry but it should be something you are cautious about.

And finally, to the last section of the lap. the Ford chicanes. The major difference here is where the grip is. All three versions of the lap send the 963 over the kerbs very aggressively, but Le Mans Ultimate's 963 especially can not carry as much speed through this final section. The real-life lap is the happy median when it comes to this final section between Le Mans Ultimate's oversized kerbs and iRacing's lack thereof.

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Final Thoughts​

Overall, the comparison showed some very surprising results. the reflections on iRacing may not look great in this piece, but you have to remember their scan is older than Le Mans Ultimate's version. Despite this factor, we think that Le Mans Ultimate is still the better simulator to emulate Estre's pole lap in 2024. This conclusion comes down to the implementation of the circuit's track limits and the kerbs especially.

Kevin Estre Pole Lap: 3:24.634
Le Mans Ultimate: 3:25.064
iRacing: 3:21.928

Which sim do you think would be best to emulate a pole lap in? Let us know in X @OverTake_gg or down in the comments below!
About author
Connor Minniss
Website Content Editor & Motorsport Photographer aiming to bring you the best of the best within the world of sim racing.

Comments

Nice Comparison video. I believe the time difference between Iracing and LMU is going to be partly due to the deployment of the hybrid system and how both sims interpret them. Since the hypercar uses a hybrid system for better efficiency rather than just performance. Unlike in iRacing, you can adjust the car settings to push it harder and extract more performance by changing the deployment.
 
incredible I found slower than me on LMU, thank you I'm not quite finished ! :roflmao:
 
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hybrid system: How much is actually represented also how much different do each dev team do it ? Is hybrid 1 size fits all or is it the way each dev team interpret it ? I ask as i have no idea on how hybrid works or how it is implemented into sims.
 
I feel like this article needs to be amended @Connor Minniss The use of deployment between both sims is very different. LMU has modelled the battery deployment as in real life. The deployment in the hypercars has a direct impact on fuel efficiency and doesn't impact performance. Deploying the battery will not increase your speed as is the case in these cars in real life.

Iracing hasn't modelled this correctly so when you deploy battery in iracing it actually increases your speed which isn't how it works in these cars in real life.

This explains part of the difference in time.
 
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I feel like this article needs to be amended @Connor Minniss The use of deployment between both sims is very different. LMU has modelled the battery deployment as in real life. The deployment in the hypercars has a direct impact on fuel efficiency and doesn't impact performance. Deploying the battery will not increase your speed as is the case in these cars in real life.

Iracing hasn't modelled this correctly so when you deploy battery in iracing it actually increases your speed which isn't how it works in these cars in real life.

This explains part of the difference in time.
Quite dissapointing from iRacing, considering they were the first ones to bring stuff like hybrid and e-diffs simulation to the market.

AMS2 has the same problem (and it's worse in Time Trials), but at least there is a better model in beta, which works closer to what you would expect.

I would like a model which simulates battery temp and does not let you use the deploy without consequences, and have that related to car setup via vent openings. If LMU isn't doing it (don't own it yet), then nobody else does.
 
Premium
I'll just leave this here:

The bumper cams made it all wrong for me, I guess that they don't all have interiors, but still, some were good, some were brown and some were not good, I did feel though that he had a favorite from the get go and even ignored some of the downpoints that other games were hammered for.
I probably missed the point but GT7's Lemans wasn't there... (or did he already say PC only) and as much as I hate to sing up the game it's one of the best I've raced, not that I pay much attention to what's what when I'm racing.
But yeah, the LMU, iRacing and RF2 did look quite good.
 
Only LMU does the top class of Le Mans justice...

It's amazing that as we get closer to reality visually we get further away from reality in the physics... Except for LMU... It could of fallen into the trap of making an easy game for the masses, instead they've given us the closest experience to driving a hypercar on the market today...
 
I haven't purchased LMU yet as I'm waiting for it to be more polished but aren't the FFB and physics the same (or at the very least very close) to rF2?
It's no secret that rF2's tyre model and physics have always been top class but some comments here and in the youtube video make it sound like LMU came out of nowhere and is way superior to everything else in terms of feel.....or is it maybe that all these people never bothered to try rF2?
 
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An engineer at Peugeot Sports said that even the best professional simulators are 80% close to reality. They don't use the AI because it's so weak. Though simulators are to learn new tracks (for example in the WEC, Interlagos where the majority of the pilots had never raced).
 
Premium
I haven't purchased LMU yet as I'm waiting for it to be more polished but aren't the FFB and physics the same (or at the very least very close) to rF2?
It's no secret that rF2's tyre model and physics have always been top class but some comments here and in the youtube video make it sound like LMU came out of nowhere and is way superior to everything else in terms of feel.....or is it maybe that all these people never bothered to try rF2?
yes pretty much. And despite what the fanboys would have you say ( and LMU has its fair share of them, just like AMS2 and all the others ), it's not perfect or the holy grail of FFB/physics. The fast people have found, very quickly, how to abuse the slip angle ( which is what a lot of people moan about in AMS2 ) and personally, I find the mid corner FFB a bit lacking and after the last patch, the lock ups in the GTE cars are very frustrating. You can see a diamond of a game in there, but it needs a lot of work still, and plenty of basic things are missing ( most glaringly, VR, driver swaps, and the ability to run custom servers - which I really think they should prioritise to get the league scene going ). And of course, even with Imola, you are looking at a very limited amount of content although the cars are beautifully distinct from one another.
 
I haven't purchased LMU yet as I'm waiting for it to be more polished but aren't the FFB and physics the same (or at the very least very close) to rF2?
It's no secret that rF2's tyre model and physics have always been top class but some comments here and in the youtube video make it sound like LMU came out of nowhere and is way superior to everything else in terms of feel.....or is it maybe that all these people never bothered to try rF2?

I was around for the early BETA days of rF2...

LMU is not ISI rF2, it's not S397 flavoured rF2 either... And that's what I was afraid of, a watered down "accessible" WEC game where cold tyres weren't a thing and hooning was... Not a serious simulator that we got in LMU where you can't get away with things that you can in the LMDh's from AMS2 for example...

There's a lot of S397 fanboys who think it drives too much on ice and have lost that ability to hustle they once had and still do have in rF2... Who were hoping for something similar to circa 2020 rF2 and it's extreme yaw angles for an accessible WEC game...

It's a bit like a merger of the early days and modern days of rF2, without that terribly boring first few years of S397 adding too much grip to make rF2 more accessible... With a better graphical template and better FFB on top that makes it just that much better than anything S397 have done for rF2...

It just needs private servers and a few more tracks and I won't need a jack of all trade hypercar in another sim... As there's a great BOP'd league mod for rF2 already... But that doesn't have the hybrid tech or brake migration that sets the LMU hypercars a class apart from anything else on the market...
 
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Premium
Assetto Corsa + CSP + reboot team v2.9 of lemans (+ paid pyver 2024 extension) + 2024 hypercars by RSS and VRC paid mods, and other cars for free + 2024 skins free on overtake.gg. To me the current state of AC is more enjoyable for me at the moment than LMU. i like LMU, i bought it, but it is so badly optimised, and AC just looks great for me on my PC and the cars drive beautiful. PLUS it is cheaper than LMU or iracing. TRR discord page also has great BOPd version of all the LMH "and!" IMSA GTP cars.
 

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Assetto Corsa + CSP + reboot team v2.9 of lemans (+ paid pyver 2024 extension) + 2024 hypercars by RSS and VRC paid mods, and other cars for free + 2024 skins free on overtake.gg. To me the current state of AC is more enjoyable for me at the moment than LMU. i like LMU, i bought it, but it is so badly optimised, and AC just looks great for me on my PC and the cars drive beautiful. PLUS it is cheaper than LMU or iracing. TRR discord page also has great BOPd version of all the LMH "and!" IMSA GTP cars.
Yes.. and then you find out that the AI is crap, and all the fake names annoy you, and the track stil is nowhere near as good as the two featured in this article, and you spent so much time installing all that, and the right BOPs and etc, and then the laptimes are nowhere near as close to real life as LMU, and so in the end you might as well bought LMU in the first place...

I love mods, and love modding, but LMU is one of those cases when modding becomes redundant, because the product is already there (almost).
 

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