iRacing

From the GT3 Ruf I ran a set with tyre pressures around 27-28 and the last 5 laps were very tricky. In the next race I ran a set with pressures of 24-25 and they seemed pretty consistent throughout.

Not that I have much knowledge of setups, more of an observation.
 
The C-spec is a little different, those would be high starting pressures for us. I start with 23.5 front and 23 rear @ Spa. That gives me a stable 30c over a full tank for the 24hour practice.
 
^^

Your system is similar to mine in terms of performance.

What graphics settings do you use? Have you adjusted the GPU and RAM usage sliders in game from defaults?

Do you get poor frame rates or low GPU usage in races compared to testing?
 
I have everything maxed out, I edited the renderer.ini file to uncompress all the textures and I activated all the mirrors to refresh every frame as well as editing the amount of available GPU ram available. There is a huge thread on iRacing forums about setting up in the NVidea control panel for AA, I followed that to the letter and I'm actually running 3x 27" screens @60hz now instead of 1@144hz.

Spa gives me a couple of stutters, but I think it's a problem with the track to be honest, since this build I have got them as people connect to a race/session but otherwise it's fine. Spa is not a great track for maxing out though, today I race at Daytona, i'll let you know...
 
Do you use V Sync or frame cap?

Which Nvidia driver are you using? I'm on the latest one, but can't go back by too many as I'm running a GTX 970.

I've read through a lot of the Nvidia thread, but my problem is mainly down to GPU usage dropping from 80-99% while testing, which runs perfectly ok. To 40-50% during a race and the game is stuttering and dropping to 35 FPS.
 
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I use the virtual v sync (or whatever it's called, in the nvidea control panel) and just lately i have used v sync too @ 60fps. I haven't noticed any drastic input lag.

I will watch my gpu usage in a race today, I don't get drops like that though, but I didn't update to the newest drivers either.
 
Followed that NVidia guide to the letter and the game runs almost perfect. Very slight dip from V Sync of 59 to 56 just before Bridge corner. Other than that the game ran peachy from start to finish.

So much so I beat my best time by a full second, everything felt spot on.

Thanks Muska.
 
barmyllama said:
I was a second faster.

I had triple buffering and adaptive vsync enabled in the NVidia control panel.
Click to expand...

That's presumably because your computer wasn't good enough to maintain a steady frame rate ? in which case it may help as it smooths things out and makes a stuttery mess playable.

However if you have good fps there is a sizeable difference in speed between no vsync and some, you won't catch a single alien/v fast guy running vsync unless they absolutely have to in order to have a playable experience.

The thing is that with it enabled you sometimes don't even notice the input lag in terms of how the car feels (unless you are very analytically minded), its only when you a/b your vsync/no vsync laptimes you become aware of how the input lag is effecting your speed.
 
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My PC is up to the job of over 100 FPS on triple screens (i5 4960k, GTX 970, 8GB RAM) I did have have 2 970's but iRacing doesn't work well with SLI, so I tried just the one.

My problem was losing 50% GPU usage between testing and racing. So while testing I'm lapping with anything from 100-200 FPS. During races it was crashing to 35 FPS at times and that was causing noticeable input lag.

After following the guide in the forum, I've got smooth and playable experience and I can enjoy racing.

In the race I did tonight I started 17th and finished 4th and beat my best lap time by a second.

I'll never be fast enough to worry about catching aliens, so I'm happy to play with the settings I've got now.
 
Ive never had issues doing 7680x1080 on a single 290x with full settings, and i run v-sync and render individually and i think it hits about 70-80% usage in races for 60/120fps (afterburner sees 120fps, game renders 2x 60fps). I have a feeling when i tried rendering as 1 it didnt do the bezel correction or something? there was a reason i went straight back anyway.

I have read about people dialling the settings back to 200fps and getting faster laps, but it wasnt quite as simple as that, wouldnt surprise me if its the same GPU issue.
 
I'm so happy with single card performance that I've just sold my other GTX 970.

Fanatec Club Sport V2 pedals will be ordered this weekend.

On a side note.

There's something to be said for starting at the back.

I've just started dead last (30th) in the top split 2pm GT3 race and finished 11th.
 
Tell me about it! Our race was going well playing the long strategy. It's a great race to be in, so much traffic, and for the most part they're doing save overtakes.
 
One of our close rivals just put and we gained a position, then as they changed doers their car dropped from the to of the garage!
Iracing need to fix that.
 
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