[WIP] 1971 Porsche 917K

Seven Smiles said:
I have just run a race at Sebring where the temperature is 45C and the engine overheats (even at 35C in practice it overheated very quickly). The Radiator Size is fixed at 1, I can't see any way to bring the temperature down. The engine survived a half hour race with smoke coming out the back which I think says there's something wrong there too.

Great fun to drive though :)
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Keep your rpm's down. Try to shift at 8200 or sooner whenever you can. Peak power is at 8400, so there is no point in going higher than that. Peak torque is around 6800, so as long as your up-shifts land around here you will be fine on power. I have found at the Le Grande circuit, that if I extend 5th gear so that I max at 7600rpm on the straight, I gain 3-5kmh compared to a max rpm of 8000.
Remember, these cars are air cooled, no radiator. Thats what that little fan is doing on top of the engine. :D
 
rocketjockeyr6 said:
Keep your rpm's down. Try to shift at 8200 or sooner whenever you can. Peak power is at 8400, so there is no point in going higher than that. Peak torque is around 6800, so as long as your up-shifts land around here you will be fine on power. I have found at the Le Grande circuit, that if I extend 5th gear so that I max at 7600rpm on the straight, I gain 3-5kmh compared to a max rpm of 8000.
Remember, these cars are air cooled, no radiator. Thats what that little fan is doing on top of the engine. :D
Click to expand...
very good points rocket
send you a mp christopher
 
Began tonight, I'll see what I can do on alpha layer to do this properly to get the hard leather and the metal to show decently. There is still some texture missing but just a little glimpse won't hurt:

917K Steering prev.jpg

Edit: this is at half the size. I did each individual letter on the wheel so it would match the reference picture perfectly, amidst other OCD things. Hoping the alpha layer will be good enough that I can remove the leather grain from the main texture.
 
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Opened this up in CarStat, findings are as follows:
917carstat.png

The numbers I had mentioned before are for the 5.0L engine, the one used for the mod is the 4.9L.
Basically, what I take from this is; set rev limit to 8400rpm(no higher than 8600), set gearing so that upshifts at 8k land near 6k, and set 1st gear so that you exit the slowest corner no lower than 4500rpm.

Cheers
rocket
 
rocketjockeyr6 said:
Opened this up in CarStat, findings are as follows:
View attachment 9020
The numbers I had mentioned before are for the 5.0L engine, the one used for the mod is the 4.9L.
Basically, what I take from this is; set rev limit to 8400rpm(no higher than 8600), set gearing so that upshifts at 8k land near 6k, and set 1st gear so that you exit the slowest corner no lower than 4500rpm.

Cheers
rocket
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This graph is of the engine currently in the car, or can they be changed out?

I've subscribed to this mod and it's downloading now (albeit slowly due to my poor internet connection). If I can get my old pedal input board working, I might even be able to drive it tonight. :D Looking forward to it.
 
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Just did an hour @ Rouen Les Essarts, ambient temp was 29*C, ~20 cars on track(at the start at least ;) ).
Rev limiter was set to 8200, never got hot for a second.
Finished 5th because of mistakes, hard vehicle to tame for an hour straight. :D
Cheers
rocket
 
According to Paul Frere, who was given a chance to drive both a 908 and then a 917 on the Nordschleife very early on in the 917's development, the latter car was much more physically taxing to drive, with demonstrably heavier steering than the smaller car, and that's just part of why it was seven seconds slower (then). One of the things that pleased me a lot about our WSC 1970 version was that the same was true of our virtual cars (our laptimes were usually within 1% of real-world times at a lot of tracks), and even though we had very low-poly 3D models, I think our physics rocked. If these guys can emulate or improve on that, they'll really have nailed it.

Worth noting too that even with the big wheel (which blocked the view of the road ahead for a lot of drivers) the steering was still "heavy." Power steering (then) was a NASCAR thing....

CS
 
If I may add....the works drivers would not touch the 917 at the Ring in 1969. "we let the others find out about ze car." Frank Gardner was paid a nice sum to drive it and finished 9th. Vic Elford was asked to do a lap of the Targa in 1970 and was physically destroyed when he came in.
 
yoss said:
With those tools : https://forum.studio-397.com/index.php?threads/rfactor-2-online-tools-by-chris-“redapg”.53457/
We can may be convert yout csgt70
Physics to rfactor2, if you allow us to use them.
Some 3d too may be , if you still own the source .
Can save time
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For my part, I would be happy too, but I really 'own' don't any of the files except the setups I built to go with each distro. That's why I was wondering in my first reply if you have heard from Bristow, our physics guru.

I do know a "representative" of the CSGT team allowed the folks from MNRL to use the mod as a base for a "league edition" they wanted to build, and I'm in contact with some of them, so I will see what I can find out--who to contact, that is. Unfortunately, I've lost track of our team leader, but I will see what I can do.
 
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I have been thinking about why this car is so believable to drive and its the way the road pulls the wheel.

I drive highway tractor trailers and I have to constantly correct the wheel and plan my corner entry, not much unlike driving a race car. All the math and theory is the same with same outcome. I guess it's one reason why I enjoy driving a sim so much.

The more I am convinced of the sim experience is real the longer and better I drive.

I can even feel the front end jump on the bumps on a long straight which adds a whole soup of feed back to deal with. Very well done
 
vegaguy5555 said:
I have been thinking about why this car is so believable to drive and its the way the road pulls the wheel.

I drive highway tractor trailers and I have to constantly correct the wheel and plan my corner entry, not much unlike driving a race car. All the math and theory is the same with same outcome. I guess it's one reason why I enjoy driving a sim so much.

The more I am convinced of the sim experience is real the longer and better I drive.

I can even feel the front end jump on the bumps on a long straight which adds a whole soup of feed back to deal with. Very well done
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Try driving with a period correct suspension setup(10cm minimum height) the feeling is surreal. This set is made for Rouen Les Essarts 74-94
 

Attachments

Big one comin, look out. :eek::rolleyes:
GRAB_017.JPG

porsche917k2.jpg

Ive noticed that the front tyres are a bit too thick. Even with 10cm ride height the fender doesnt clear the tyre.
Im sure it would not be easy to just resize it and move on. I dont expect a quick fix or anything like that... but considering that the mod is still in development, I figured that I would bring it to your attention.
Ive also noticed strange environment reflections on the body and in the cockpit, very rarely, but they usually go away after I drive a few hundred meters or so.
Like this:
GRAB_016.JPG

The purple stripe is the exterior paint/skin, and the rest looks to be the asphalt.

One last thing... :oops:
Do you plan to put a mirror up on the windshield? The one Steve is looking at. :cool:
lm.png

And touching;)
lm2.png


Cheers mate, and thanks for your great work!
 
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