4WD performance cars with RWD bias
4WD performance cars with RWD bias
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Discussion

winshent

Original Poster:

1,174 posts

217 months

Tuesday 24th April 2012
quotequote all
I can't seem to find any info on this on the net, so am relying on the wonderful world of ph to help me out..

What 4WD performance cars push most of their power to the rear, and then transfer power to the front after you've had some fun with the back end without losing it.

I was out on a run with a couple of mates recently who run a GTR and a 996 Turbo.. And apparently they run power to the back and let you have some fun before bringing it all back into line.. Which sounds pretty interesting to me..

This is a potential what car thread with a 25k budget, as might swap the Focus RS.. However, it would also be interesting to know how 4WD performance cars above this price range distribute their power.

So what cars do the above.. details on F/R power distribution would also be helpful..


anonymous-user

76 months

Tuesday 24th April 2012
quotequote all
Most are fwd sending drive to rear when front slip or as in suburu case maybe max 50/50 split front to rear.

The main 4wd would be I can think maybe a bmw xdrive model (would have to be import) or a alpina 4wd. BMW set it up for rear wheel bias.

Some of the haldex systems can have the bias changed to the rear through modification, i.e a r32.


Stu R

21,420 posts

237 months

Tuesday 24th April 2012
quotequote all
R32 / R33 / R34 GTR all did it, and all are well in your budget. It's actually a pretty nifty system which has seen a few tweaks over the years and still features on the current GTR - more on it here if you're interested - ATTESA. Fronts only get power when it's needed, and even then it's not that much.

911 turbos do much the same sort of thing, I believe most of the Audi RS4 and S4s offer a 40/60 split f/r, and some of the Subaru crowd can do more rear bias (66% rear rings a bell, could be wrong)

To name a few smile

(edited to fix dud link to ATTESA wiki article)

Edited by Stu R on Wednesday 25th April 08:24

Dave Hedgehog

15,672 posts

226 months

Tuesday 24th April 2012
quotequote all
most are front biased or 50/50, nissan had to jump through hoops to get the R35 to be biased to the rear, sending the power down to the back and then back up to the front !

i have driven at least 6 different quattro cars in the last few months and only when your 100% on it can you tell a slight difference

there are mods to change the power split on haldex as well


mrmr96

13,736 posts

226 months

Tuesday 24th April 2012
quotequote all
Stu R said:
R32 / R33 / R34 GTR all did it, and all are well in your budget. It's actually a pretty nifty system which has seen a few tweaks over the years and still features on the current GTR - more on it here if you're interested - ATTESA. Fronts only get power when it's needed, and even then it's not that much.

911 turbos do much the same sort of thing, I believe most of the Audi RS4 and S4s offer a 40/60 split f/r, and some of the Subaru crowd can do more rear bias (66% rear rings a bell, could be wrong)

To name a few smile
I want to read about ATTESA, can you fix your link? (It currently goes to a PH new post window!)

k3ybo

107 posts

211 months

Tuesday 24th April 2012
quotequote all
I assume it was a link to the wiki page:

http://en.wikipedia.org/wiki/ATTESA

but any further information would be interesting to read...

neiljohnson

11,298 posts

229 months

Tuesday 24th April 2012
quotequote all
I went down this rd a few months back with my Rs trouble is of all the 4wd cars ive driven (being in the trade not many i havent) you just dont get the fun factor, the closest i came was with the Evo 9 but even then imho you need 400bhp to get there cosworths are rwd bias but are getting old now.

Ive decided to keep the Focus for me but have been looking into getting another car for the wife (not that she knows yet laugh) ive been looking at M3's as i think i will then have the best of both worlds.

Your budget will get you in the lower end of amg 63 mercs for a crazy car that while not the best in handling has a fun factor of 11! wink

If your resigned to going 4wd then i think saving a bit more & either a gtr or a 996 turbo will be your best bet (running costs compared to the focus should be considered) as the Focus is a hell of a car to beat if you do manage to find a car that beats it let me know!!

TheHeretic

73,668 posts

277 months

Tuesday 24th April 2012
quotequote all
Stu R said:
R32 / R33 / R34 GTR all did it, and all are well in your budget. It's actually a pretty nifty system which has seen a few tweaks over the years and still features on the current GTR - more on it here if you're interested - ATTESA. Fronts only get power when it's needed, and even then it's not that much.

911 turbos do much the same sort of thing, I believe most of the Audi RS4 and S4s offer a 40/60 split f/r, and some of the Subaru crowd can do more rear bias (66% rear rings a bell, could be wrong)

To name a few smile
The AWD Infiniti's use the same system. RWD most of the time, and AWD when required.

morgrp

4,128 posts

220 months

Tuesday 24th April 2012
quotequote all
Audi's r8 does and presumably the awd lamborghinis do too

bungle

1,874 posts

262 months

Tuesday 24th April 2012
quotequote all
B7 RS4 would surely meet all your criteria?

J4CKO

45,587 posts

222 months

Tuesday 24th April 2012
quotequote all
996 turbo doesn't seem to allow much 'fun', seems to be very fast until it runs out of ideas and the ESP calls time.

s m

24,115 posts

225 months

Tuesday 24th April 2012
quotequote all
Sierra 4x4 system ( also used in Escort Cosworth as well as XR/GLS 4x4 and Sapphire Cosworth 4x4 ) - roughly 34% Front / 66% Rear

Edited by s m on Tuesday 24th April 08:26

ikarl

3,879 posts

221 months

Tuesday 24th April 2012
quotequote all
Impreza Sti Type R - the two door model

I had one and you have an internal DCCD, which is basically a dial that means you can send about 70% off the power to the rear (which is where you leave the dial 95% of the time)
if the road gets slippy (ice/snow/rain) you can dial it in to 50/50

this is not done automatically by the car though, you do have to adjust it yourself..... which can be quite fun in the snow when you catch a monster drift, dial it to 50/50 and power away wink

arfur

4,004 posts

236 months

Tuesday 24th April 2012
quotequote all
Subaru Forester ProDrive and STi send 60% to the back as default and can channel up to 60% to the front when necessary

mrmr96

13,736 posts

226 months

Tuesday 24th April 2012
quotequote all
Contrary to popular belief the Mitsubishi Evo's all have a 50:50 front:rear torque split 100% of the time. The ACD (active centre diff) introduced in the Evo 7 only allows the centre diff to lock and unlock - it doesn't change the front/rear torque split.

Grey Ghost

4,608 posts

242 months

Tuesday 24th April 2012
quotequote all
doogz said:
Impreza Type R had a driver controlled centre diff, allowing you to alter how much torque was sent where.

Well under budget, not sure what, if any, newer models had the same centre diff.
This, or look for a well maintained 22B biggrin

rallycross

13,675 posts

259 months

Tuesday 24th April 2012
quotequote all
Impreza Spec C and JDM model STi have DCCD diff controller, my Spec C and Type 25 both had this and it did make a noticable difference with max rear bias set.

dhariwab

642 posts

173 months

Tuesday 24th April 2012
quotequote all
insignia vxr is front biased haldex drive normally and on pressing sport button sends 60% of power to rear. 320BHP I think, can be chipped tuned much higher.

christofmccracke

881 posts

222 months

Tuesday 24th April 2012
quotequote all
Evos have 70/30 split I believe with 70 going to the rear

KB_S1

5,967 posts

251 months

Tuesday 24th April 2012
quotequote all
Dave Hedgehog said:
most are front biased or 50/50, nissan had to jump through hoops to get the R35 to be biased to the rear, sending the power down to the back and then back up to the front !
The reason for the R35 GT-R setup was keeping the engine behind front axle I thought?

Al the previous GT-Rs from 32-34 managed RWD bias just fine without that setup.