Hello,

In real life, i'm considering to buy a Lancer Evo or a Gt Four ST205. So i'm taking information about these cars and i've discovered that the cars with transverse mounted engine can't send more than 50% of the torque to the rear wheels. Longitudinal mounted engine like Subaru and Skyline GT-R could.

Quote :

[...] The Mitsubishi, on the other hand, never sends the majority of engine torque to the rear axle. Instead, it can send all the engine torque to the front wheels or 50 percent of it (using an electrohydraulic clutch on the center diff). So the Evo varies the front-to-rear torque split between 100/0 and 50/50. [...]

http://www.caranddriver.com/fe ... eel_so_different_-feature

So why the RB4 wich as a transverse engine car can get up to 95% of torque to the rear wheels ?

Because RB4 is RB4 and not a Mitsubishi

Just says 4 wheel drive, nothing about transversal

http://www.lfs.net/?page=contents&car=rb4_gt

Quote from alex_du_77 :

So i'm taking information about these cars and i've discovered that the cars with transverse mounted engine can't send more than 50% of the torque to the rear wheels.

The Ford Escort RS2000 4x4 is transverse and it has a 40F/60R split. It is all down to the gearbox and differentials used.

Quote from P5YcHoM4N :

The Ford Escort RS2000 4x4 is transverse and it has a 40F/60R split. It is all down to the gearbox and differentials used.

agreed, imho all lfs cars are like 80's korean cars, Minimal features with unreliable performance.

Not completely related to topic, but some times I get bored and like to setup the RB4 as a rock crawler, even with locked diff front and rear, when trying to get up that steep hill on the FE chicane the car will spin as if it has an open diff.

Quote from FPVaaron :

Not completely related to topic, but some times I get bored and like to setup the RB4 as a rock crawler, even with locked diff front and rear, when trying to get up that steep hill on the FE chicane the car will spin as if it has an open diff.

If you want some fun, set the RB4 to RS200 gear ratios, use a rear biased centre diff (I go for 35/65) and a soft road going suspension setup. Top speed is blunted quite a lot, but it is fantastic fun to throw around a tight track as it is just pure power sliding action.

It has mothing to do with the placement of the engine. Only center differentials / center clutch make the difference.

You can imagine an AWD car with Haldex type center differential as a front wheel drive system (engine / transmition connected to front wheels) adding an axle transferring torque to the back wheels which has a smart clutch to make variable the torque going to the back wheels.

At 100% engagement of this clutch engine torque is 50% front 50% back. Thats it.

In my view this type of AWD must be considered as partial AWD.

GTR, EVO and ALL MANUAL subarus have center differentials, some models super advanced electronic, some simple friction based. Engine/transmition output is connected to the center dif and the decission is up to the dif specs where to send the torque.

EVO also has one of the most advanced rear dif which makes it very easy to drive fast.

Subaru is based mostly on optimized physics (low center good balance etc) as also center diffs.

GTR is a new world I donnot know exactly.

The writer of the car and driver tester is completely wrong on these. Only auto subarus use clutch at the middle and subaru considers them as partial AWD.

Clutch based cars are audi a3 range (including s3) all haldex ones (VW , volvo honda crv's etc)

Finally very few cars have clutch systems where primarily engine/transmitions output is connected to rear wheels and clutch tranfers torques to front wheels like lambos, audi r8 (a lambo actually) porche 959.

So clever and no S2



prepare to be flamed. Welcome to LFSforums.

the R8 and the Bugatti Veyron btw are "real" AWD cars, almost like a normal Quattro system running in reverse. They just send like 80% to the rear wheels under normal circumstances (iirc up to 50% to front if rear slips/on hard acceleration)

Quote from KiRmelius :

So clever and no S2
prepare to be flamed. Welcome to LFSforums.

Maybe you should read his post again

I love driving the RB4 its one of my fav cars in LFS not sure I'd be happy with 95% torque at the rears though

SD.

Quote from P5YcHoM4N :

If you want some fun, set the RB4 to RS200 gear ratios, use a rear biased centre diff (I go for 35/65) and a soft road going suspension setup. Top speed is blunted quite a lot, but it is fantastic fun to throw around a tight track as it is just pure power sliding action.

Thanks but that's no where near a rock crawler

Quote from FPVaaron :

Thanks but that's no where near a rock crawler

Or the excitement of driving a XRT

Quote from FPVaaron :

Thanks but that's no where near a rock crawler

Rock crawling is for fat people who like to say "a'yup!" and drink light lager (as if lager can get any lighter).

Lol....

As I said I do it when I'm bored, I only use the RB4 for actual racing if it's a rally track, I don't particually find the RB4 fun for anything other than messing around or tormenting cruise cops.

Though the main point of my post was not comparing a sport famous in Iceland to a hatch made by ford.
It was that the RB4 diff even when locked behaves in the same manor as an open diff when placed on a steep grass incline with a high gear ratio.

That is where setting it up as an RS200 comes in. I use it on autocross/rally and for playing tag as you can get the power down so quickly.

But yes, I suspect the reason the locked diff doesn't quite work correctly is mostly because of how the grass is modelled in LFS combined with the tyre physics. Doesn't quite react like drive on grass should.

Quote from P5YcHoM4N :

Rock crawling is for fat people who like to say "a'yup!" and drink light lager (as if lager can get any lighter).

Northeners?

Quote from KiRmelius :

So clever and no S2



prepare to be flamed. Welcome to LFSforums.

Thank's Kirmelius, I didnot know....

I am an IT director on a software development company.

thus :

I have never bought anything using internet.
I donnot participate in social nets.

thus : Demo user

also

Audi R8 is another design in the platform of Gallardo. Has the awd of labos. All are based on 959 (It has a strong placement in cars history)

Quattro is a general term describing anything from Haldex, torsen and clutches used in audi cars. The same occurs on other companies subaru nissan etc.

Ok it would be mostly kind if there is anyone on this forum owning an impreza sti previous version (2001 -2008).

Has RB4 the feeling of an sti or can it be made using settings to have anything like that ???

Thanks for your time.

Quote from tsichles :

Thank's Kirmelius, I didnot know....

I am an IT director on a software development company.

thus :

I have never bought anything using internet.
I donnot participate in social nets.

thus : Demo user

also

Audi R8 is another design in the platform of Gallardo. Has the awd of labos. All are based on 959 (It has a strong placement in cars history)

Quattro is a general term describing anything from Haldex, torsen and clutches used in audi cars. The same occurs on other companies subaru nissan etc.

Ok it would be mostly kind if there is anyone on this forum owning an impreza sti previous version (2001 -2008).

Has RB4 the feeling of an sti or can it be made using settings to have anything like that ???

Thanks for your time.

Settings can be done, but physics are a lot strange.

I've driven a lot, a 2003 STi full stock, but i didnt manage by myself to match a setup for RB4 to reproduce the feeling.

The game's physics dont help a lot, they come close to reality but there's something missing i guess, didnt search about it a lot because it's a nice game, having 1 hour free time a day to race. I dont want nothing more theese days anyway ;p

Troll troll troll tolliciously trolling away in a trolling fashion known only to epic trollinians in this trollvinerse.

To OP: Lan EVO vs GT4 ST205 ? New EVO or some old generation ?

To tsichles:
The GT-Rs have the same RWD-based system which uses a electronically controlled central coupling clutch. There's no central diff.
I've heard that the coupler on the new R35 can behave very aggressively, making the car more like a traditional 4WD at corner exit. I'm not sure though, never been in any R35.
Old GT-Rs, like the R32 I've driven, are basically RWD. The central coupler can't transfer much torque.

Quote from tsichles :

GTR is a new world I donnot know exactly.

If you mean thr GTR R35, it's a pretty nifty design. Transaxle AWD.

It's a RWD design, with a secondary axle, that can transfer up to 50% to the front differential, via an electronically controlled clutch in the rear transmission. But it only does so, if the car's stability control thinks it needs to. Unless there's any sort of tire slip or excessive jawing, it operates mostly as pure RWD.

Quote from Keling :

Old GT-Rs, like the R32 I've driven, are basically RWD. The central coupler can't transfer much torque.

There must have been something wrong with the R32 I owned then, because it transferred the same maximum 50/50 between front and back like any other GT-R does with attesa in it when doing a hard standing launch.

The main principle of the 4wd system has always been the same amongst the R33, R34 and the R35 models ever since the R32 debuted. Only R32 can remain completely rear wheel driven however, since from R33 onwards, there was a 5% preload applied to the front wheels at all times through the center clutch pack so there was always a bit of 4wd action going on.