On the face of it, designing and building a virtual version of the Williams-Toyota FW31 figured to be the most formidable challenge yet faced by iRacing.com.  After all, Formula One is the technological pinnacle of the motorsports world, and it takes a virtual army of engineers, technicians and mechanics just to start a modern Grand Prix car.screenhunter_06-sep-20-16321

Thanks to the unprecedented access granted iRacing.com by AT&T Williams – not to mention the close working relationships that developed between the iRacing staff in Bedford, Massachusetts and the AT&T Williams team in Grove, Oxfordshire – the virtual FW31 came together remarkably quickly.  Given the benefit of blueprints and mounds of real world data, creating iRacing’s version of the car was, if not the work of a moment, more straightforward than might be imagined.

“People think that it should be really complicated,” says Eric Hudec, vehicle dynamic engineer at iRacing.com.  “And for Williams, starting and developing the car from scratch, I’m sure it was.  But when you’re dealing with it in a package that’s already finished it’s really not that much different from your ordinary race car.  It’s got a lot of extra little systems, but all the basics sort of work the same way for a Formula One car as they do for a Skip Barber car or a Star Mazda.

“They have suspension geometry that is pretty standard; a few of the bells and whistles are different but all in all it’s sort of the same.  The components are more expensive and they do some things differently for packaging and aerodynamic reasons but, overall, it’s not that complicated.”

The devil, however, is in the details.  While building the basic car and developing its basic – albeit awesome – on track performance may have been relatively routine, adding the state-of-the-art touches that truly separate an F1 car from any other race car has been anything but a simple process.driving games

“What’s complicated are all the finicky little details, including in-cockpit driver adjustments which most cars don’t have,” says Hudec.  “Most of our cars have gauges, dials and those sorts of things to monitor the car’s systems.  But with the Williams, you can pretty much change some major performance factors of the car from the cockpit.  That’s been difficult, from my side, figuring ‘OK, you’ve got these knobs and dials on the FW31, how do I make it so someone racing on their simulator can use the buttons on their steering wheels and keys on their keyboards to affect the same performance parameters of their car?’

“A lot of work goes into the background that says ‘When I hit this button it should make something change on the dash and then affect the physics of the car.’  And the FW31 has a whole bunch of those knobs from differential knobs to an engine braking knob to engine power, so on and so forth. Those have all been built into our FW31.”

Actually not all of them have been built into iRacing’s virtual version of the car.  That’s because, in some respects, the iRacing Williams-Toyota is ahead of its real world counterpart.  Take fuel mixture, for example.  Owing to many factors – ambient temperature, relative humidity, barometric pressure, to name a few – the settings for optimal fuel/air mixture in a real world F1 engine are constantly changing during the course of a race.  Not in iRacing where it’s always mainly sunny and 72 degrees.

“The fuel mixture knob on the ‘real’ car is used if the telemetry shows the fuel mixture’s not precisely right,” Hudec says.  “On our cars the fuel mixture setting is always precisely right.  So we don’t need that knob.”

games racingOne aspect of the Williams-Toyota FW31 – be it real or virtual – that is not always precisely right is the aerodynamic setup.  One needn’t be Sam Michael or Patrick Head to understand the aerodynamic downforce that glues a car to the road in the corners is the aerodynamic drag that slows it on the straightaways.  The long–standing prohibition of “moveable” aerodynamic devices has been somewhat modified of late to allow F1 cars one “reset” of their front wing angles per lap.

That cockpit adjustable front wing will be incorporated into iRacing’s version of the car.  When that occurs remains to be seen, however.  And that has less to do with the design of the virtual race car than with the rules ramifications to the iRacing scoring system.

“You are allowed to adjust the front wing angle on the fly in F1, but only once per lap – and back again,” says Hudec.  “Let’s say you go past the pits and your front wing flap is 20 degrees.  You can change it to 30 degrees and then back again, on one lap.  The next lap you can change it to 15 degrees, and then back again, but you can only change one step per lap.

“So that’s kind of interesting, but I’m not sure that’s going to be implemented right away on our car.  There is some underlying code that needs to be changed in order for that to happen. It’s complicated.  The iRacing software needs to know when you complete the lap and record what your previous wing angle was and if you changed it already or not, and implementing that is going to take a little time.”

Indeed, it may well be that iRacing’s virtual Formula One car will imitate the life of a real Formula One car in that its development is ongoing.  And if the Williams-Toyota FW31 that debuts at the start of 2010 Season Four is a bell or a whistle short of the real thing?  Not to worry.

“We will do our very best to get as much out there on the car the first go ‘round,” says Hudec, “but there will be additional features we add as we go forward.

But I’m confident that what we produce, right off the bat, is going to be a realistic – and fun – experience for our members.

“It’s in testing mode right now and it’s mind-blowing.  The performance is unbelievable.  I’ve really enjoyed the project so far, making small changes and getting feedback from the testers, including people at Williams, saying ‘That’s cool’ or ‘It was better before . . .’ I can’t wait for the members to try it out.”

Share Button

No Comments

As long as one of those ‘virtual buttons’ activates a pit lane speed limiter, I’ll be happy! Thes rest is sounding excellent.

Michael Dunn
September 29th, 2010 at 12:54 am

mmmmmmmmmmmmm I can’t wait.

Ryan Terpstra
September 29th, 2010 at 1:15 am

Many sleepless nights waiting for release.

Peter Gaimari
September 29th, 2010 at 3:33 am

Cant wait. Thanks for the article

Lopan Kol
September 29th, 2010 at 5:49 am

*waits for membersite downtime when the car is released due to overloaded servers*

Peter Read
September 29th, 2010 at 12:14 pm

mind-blowing… 😀
thanks for the write-up!

September 29th, 2010 at 12:15 pm

Every piece of info that comes out just makes me want it more and more. Longest month ever coming up.

alex ulleri
September 29th, 2010 at 12:53 pm

Seventh gear through Mosport’s turn 8 I see. Wow.

Can’t wait to drive this at laser-scanned Spa.

September 29th, 2010 at 1:28 pm

LMP1 and LMP2 can take Mosport’s T8 flat, so it’s no surprise that the FW31 can. I , like you, can’t wait to drive this ride around Spa.

Michael Barnett
September 29th, 2010 at 7:18 pm

Scottie is a fan of this!

Scott U’Ren
September 30th, 2010 at 2:19 am

I hope they include the scrape block rules so we stop seeing ridiculous bottoming and land mines like the bumps on mosport.
I think only 3-4 corners on mosport will need braking, you can try the lotus it’s the same deal just in slo-mo.

September 30th, 2010 at 1:47 pm

Luis Baboon you should buy a DFGT 🙂

Antti Ennekari
September 30th, 2010 at 4:58 pm

I’ve been having a tough time of holding off on the purchase of F1 2010 saying to myself that this will just be miles better anyway. I can’t to do some F1!

October 1st, 2010 at 10:01 am

I tried F1 2010, adjusted all of the settings to expert no aides. Before I completed one lap, I exited and uninstalled. I knew it was an arcade game before going into it, but I was hoping for the best, guess I just had to try it for myself. Thankfully, I didn’t purchase it.

October 1st, 2010 at 3:48 pm

I must disagree with iRacing on this one.

Sure it might not be possible to code fuel mixture adjustment due to constraints in iRacing physics model, but to claim that only reason F1 cars have adjustable mixture is due to temperature and barometric changes is totally incorrect.

F1 teams and drivers must manage the engine RPM shift point and fuel mixture constantly during race to optimise pace at correct time (i.e. full power when in clean air, conserve when in stuck in traffic) and manage engine wear during race.

No problem waiting for this capability, it’s just a shame to ignore the fact that F1 racing strategy depends significantly on fuel mixture management in F1…

…in fact until we have full length GP’s with safety cars, rain, etc in iRacing we won’t miss fuel mixture adjustment as with short sprint races, everyone would set max revs and mixture at point of optimum power anyway.

Ben Styles
October 3rd, 2010 at 5:01 am


What your are missing here is there will be an engine power adjustment, to do exactly what you are speaking about. However, the mixture adjustment is there to allow optimal engine tune, not strategy.

October 4th, 2010 at 3:38 pm

Correction. The last sentence should have read:

However, the mixture adjustment is there on the actual FW31 to allow optimal engine tune, not strategy. For this reason it will not be included with the iRacing version as mentioned in the above article.

October 4th, 2010 at 3:46 pm

Interested in special offers, free giveaways, and news?

Stay In Touch