What driver for Logitech FFB PRO PS2 wheel?
I've got a friend, who have one of those wheels. Remembered seeing some driving lfs with that, which driver did they use?
Thank you too.
What you say, makes sense if i think about it, because it would reverse the airflow on the intake side for a fraction of a second or more, and then when you step on it, the airflow have to be turned around once more.
If it was me, i'd choose an open BOV, no matter if it was a roadcar or racecar. If i can spare some money, i think that i'd buy one, and put it on my turbo-project car, a Saab 90 from 1985
Just too hear your opinion, which place would be the best to put the intercooler, before the turbo intake, or between the outlet and manifold - aka the pressure side - on the turbo?
My opinion is, that it's best to place it before intake, because if you compress, for example, 20 degrees celcius air to 1 bar, then the temperature would rise to 40 bar, still just an example, may not be the correct temperature-change, then you'll have to take twice the amount of heat/joules out of the air, than if you'd put it before the turbo.
It's just a thing that i've been thinking about.
How i imagine it works:
No BOV:
The turbo no longer has driving force, so it slows down very fast, because the air is getting hard to compress:
http://img23.imageshack.us/img23/8046/nobov1by.jpg
Open BOV:
The turbo no longer has driving force, so it slows down when it compresses air. Now we have a thing to prevent the turbo from slowing down as fast, and not get damaged, the BOV's spring is set, so the spring just exactly can overcome the force of full boost when driving, and when you close throttle, the pressure gets to high, and the BOV opens. Because the turbo doesn't stop, there is faster pressure-buildup when you open the throttle again. The disadvantage is, that it still has to deal with vacuum on the intake-side.
http://img23.imageshack.us/img23/7476/openbov3sh.jpg
Recirculating BOV:
The turbo no longer has driving force, so it slows down. This time it opens and vents out into the intake-side. The air expands, as it is no longer under pressure. Some gets out through the airfilter, and might be heard as a faint whistle, whilst some gets sucked through the turbo again, and recirculated. The turbo no longer have to deal with the vacuum on the intake-side, and will maintain turbinespeed a little longer time, which usually comes in handy when you open the throttle again.
http://img26.imageshack.us/img26/2738/recircbov5kc.jpg
My nickle
No BOV:
The turbo no longer has driving force, so it slows down very fast, because the air is getting hard to compress:
http://img23.imageshack.us/img23/8046/nobov1by.jpg
Open BOV:
The turbo no longer has driving force, so it slows down when it compresses air. Now we have a thing to prevent the turbo from slowing down as fast, and not get damaged, the BOV's spring is set, so the spring just exactly can overcome the force of full boost when driving, and when you close throttle, the pressure gets to high, and the BOV opens. Because the turbo doesn't stop, there is faster pressure-buildup when you open the throttle again. The disadvantage is, that it still has to deal with vacuum on the intake-side.
http://img23.imageshack.us/img23/7476/openbov3sh.jpg
Recirculating BOV:
The turbo no longer has driving force, so it slows down. This time it opens and vents out into the intake-side. The air expands, as it is no longer under pressure. Some gets out through the airfilter, and might be heard as a faint whistle, whilst some gets sucked through the turbo again, and recirculated. The turbo no longer have to deal with the vacuum on the intake-side, and will maintain turbinespeed a little longer time, which usually comes in handy when you open the throttle again.
http://img26.imageshack.us/img26/2738/recircbov5kc.jpg
My nickle
Well, howcome the turbo's behavior change so much, if it's just the enginedamage-limiter? I really don't see howcome that parameter can make the turbo spool faster then?
MecaniK's inteference with turbo-spool-time
Just fiddlin' around this evening, and made a set for the FXO Turbo that i quite like, it goes like this:
0.090 Weight
3 Drv.trn.
8 Grs.
1 12 Cylinders
1000 1001 Displacement
0.600 Power
0.150 Power bnd.wth.
0.090 T2R
1.500 RL
104.71 Idle
Take it for a spin, and note how the turbo behaves, and how fast the engine revs.
The turbo spools up quite fast when the car is in the high revs, even from zero pressure at all, and it looses pressure right before redline - just like what a car with a too small turbo would do.
Now, change time 2 rev to 5.000
The cars engine revs at aproxx. same rate, whilst the turbo takes ages to spool-up, AND down. Note how long the dump is to be silent, after running down the straight and havin' full pressure.
I think that Fonny haven't got the time2rev parameters, i think he found the turbo-spool-time parameters.
If you set the time2rev to 0.001, and hit the rev-lim, note how the press.-gauge jumps around, because of the turbos fast reaction.
Sleep tight, i'm going to bed
0.090 Weight
3 Drv.trn.
8 Grs.
1 12 Cylinders
1000 1001 Displacement
0.600 Power
0.150 Power bnd.wth.
0.090 T2R
1.500 RL
104.71 Idle
Take it for a spin, and note how the turbo behaves, and how fast the engine revs.
The turbo spools up quite fast when the car is in the high revs, even from zero pressure at all, and it looses pressure right before redline - just like what a car with a too small turbo would do.
Now, change time 2 rev to 5.000
The cars engine revs at aproxx. same rate, whilst the turbo takes ages to spool-up, AND down. Note how long the dump is to be silent, after running down the straight and havin' full pressure.
I think that Fonny haven't got the time2rev parameters, i think he found the turbo-spool-time parameters.
If you set the time2rev to 0.001, and hit the rev-lim, note how the press.-gauge jumps around, because of the turbos fast reaction.
Sleep tight, i'm going to bed
Last edited by neRu, .
CPU: P4 Prescott HT @ 3Ghz
Ram: 2x256 mb kingston value pc3200 dualchannel
Grphx: Radeon 9600 128mb
HDD: 80gigs Samsung something IDE133
KeyB: Logitech basic
Mouse: Logitech optical OEM (Faster than IE4
) (Pad: Func 1030)
Wheel1: Logitech Wingman Formula Force
Wheel2 (For clutch purpose only): Microsoft Sidewinder Precision Pro
Monitor: 21inches Philips (201b)
Internet: Upto 4m/bit down, aproxx 1 constant up (Unfortunatly i have i firewall i cant pass, or else i would have my own lfs server running 24/7)
Runs as low as 60 frames per second when there's many cars on the track. But usually it easily does 70-80 frames per second.
I think that it's a quite ideal setup, because its relativily cheap, but still it runs smoothly
Ram: 2x256 mb kingston value pc3200 dualchannel
Grphx: Radeon 9600 128mb
HDD: 80gigs Samsung something IDE133
KeyB: Logitech basic
Mouse: Logitech optical OEM (Faster than IE4
) (Pad: Func 1030)Wheel1: Logitech Wingman Formula Force
Wheel2 (For clutch purpose only): Microsoft Sidewinder Precision Pro
Monitor: 21inches Philips (201b)
Internet: Upto 4m/bit down, aproxx 1 constant up (Unfortunatly i have i firewall i cant pass, or else i would have my own lfs server running 24/7)
Runs as low as 60 frames per second when there's many cars on the track. But usually it easily does 70-80 frames per second.
I think that it's a quite ideal setup, because its relativily cheap, but still it runs smoothly
Wow - nice
Mine 1985 Saab 90
http://www.zoomcar.dk/visusercar.asp?id=1081
100bhp - and a great amount of torque
Lowered 40mm - and i'm searching for some gas-dampers. I bet you, this car is more of a challenge to drive than most in here
I've made 180degrees on the freeway at 100km/h (60mp/h) - and what a great deal of fun!
When you're in a turn, youre doomed if you lift of the throttle. Then the rear will go really really wide.
Next project is a Turbo8valve engine from a 900 - and a change of all the rubberbushes to polyeuthurane. I think(/hope) it will improve handling dramatically!
FGED GREDG RDFGDR GSFDG