View Full Version : Wheel slip?
KWAWD
11-04-2014, 07:17 AM
A couple times now when turning right at at an intersection and accelerating hard from stopped i've felt a momentary slip like a rear wheel has slipped. (This is in the wet we've had recently here). It recovers almost immediately but the car body wobbles (slight fish tail) when it happens.
Is it normal? Of course if i tried this in the KH it would be all over the place and the TCL would have a field day.
Wiggles
11-04-2014, 08:12 AM
You might just be up for some new rear tyres.
My old galant would do the same, legnum would too but it has ayc
Mcada
11-04-2014, 09:55 AM
+1 on Wiggles. Check tyres first. If they're ok, I'd be getting it checked out.
The AWDs do have limited slip centre and rear diffs and the rears can get tail happy. Done that plenty of times around a round-about in the wet.
KWAWD
11-04-2014, 12:14 PM
The AWDs do have limited slip centre and rear diffs and the rears can get tail happy. Done that plenty of times around a round-about in the wet. ah, must be normal then thanks vlad.
Tyres are all excellent. I run them at 34psi all around if that has any relevance.
I do push it hard at this certain corner near my place which is also turning into an uphill incline.
I have to so i can be out of the way of the speeders coming down the hill on my right, who'd have Buckleys of ever stopping.
No worries. I have done tests on loose gravel whereby I fully lock the steering right, left foot on brake, right foot on accelerator to between 1000 and 1500rpm, and then let go of the brake and mash down on the accelerator and the swings out and very tail happy. I have done the same holding straight line. The fronts lose grip only momentarily.
Yep - power is a little rear biased so acceleration tends to oversteer instead of understeer. Much more "race car" biased IMO :)
Having driven a Subaru Forester for 4 weeks, I prefer the handling of the AWD Magna. It's sad to say good bye.
According to Mitsubishi literature, torque is 50/50 front/back in normal conditions but can be up to 10/90 front/back or up to 60/40 front/back, depending on conditions. The rear diff can also split torque left and right depending on conditions, I just can't remember the numbers.
Madasacutsnake
13-04-2014, 09:43 AM
A couple times now when turning right at at an intersection and accelerating hard from stopped i've felt a momentary slip like a rear wheel has slipped. (This is in the wet we've had recently here). It recovers almost immediately but the car body wobbles (slight fish tail) when it happens.
Is it normal? Of course if i tried this in the KH it would be all over the place and the TCL would have a field day.
If it happened at speed you could blame aquaplaning, but accelerating "hard" (from a stop) whilst turning in wet (possibly greasy) conditions a little rear end slide out is to be expected.
Sounds like you just need to adjust your driving to the road conditions.
macropod
15-04-2014, 02:47 PM
Sounds like you just need to adjust your driving to the road conditions.
Maybe that's just what he's doing!
Madasacutsnake
15-04-2014, 02:56 PM
Maybe that's just what he's doing!
I don't understand what you are tying to say...
I was suggesting that maybe there is nothing wrong with his vehicle and it maybe that he is just a bit heavy footed for such road conditions. Logic dictates that drivers need to slow down in poor conditions and those that don't will end up on the News as road toll statistics along with the other people they mame or kill.
KWAWD
15-04-2014, 06:49 PM
.....
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I do push it hard at this certain corner near my place which is also turning into an uphill incline.
I have to so i can be out of the way of the speeders coming down the hill on my right, who'd have Buckleys of ever stopping.
Madasacutsnake
15-04-2014, 07:33 PM
.....
Okay, sounds like a dangerous corner. :think:
but...but...but it's no good successfully avoiding the speeding drivers coming down the hill if you slide off the road into a ditch. :silenced:
In the interests of safety it looks like whoever looks after the roads down there may need to install some traffic control measures such as a round about, or stop signs, or whatever would work.
There are plenty of corners like that. I have 3 like that in my neighbourhood. Also, i highly doubt kwawd's awd will slide into the opposite ditch unless the whole intersection was covered with oil. I had a situation when turning right on a dual right turn lane on the right one and encountered an oil patch under acceleration. All the car did was side step a foot or so and remained in my lane. The front stepped out first and torque was transfered to the rear and then when the rear stepped out the torque was transferred to the front and I continued driving as if nothing happened. The Mrs and the kids were very impressed with the cars handling. The cars behind me saw the situation and crawlled through the bend. The cop that was a c ars behind and on the left right-turning lane did not bother with stopping me and asking questions. The above happened in less than a second.
KWAWD
16-04-2014, 06:13 AM
It never feels like it will slide and i'm not crazy, i'm not flooring it, just pushing hard around that corner, its a sharp right turn, lol. I'd never floor the car from standstill cos i'm sure the RPM would go through the roof with no improvement in speed.
Its the first time i've ever broken traction in the AWD and its literally a split second slip by what feels like one of the rear wheels and then it recovers. Flipping awesome to drive in the wet. The KH would be all over the road if i drove that hard around that corner in the wet.
In a straight line it never slips which is an incredible feeling when taking off from the lights in pouring rain.
Many looks from the kids in their hotted up cars as the Verada leaves them behind scrabbling for traction, hehe.... Although they tend to speed past a few seconds later... proving i have no idea what.
Madasacutsnake
16-04-2014, 10:11 AM
https://www.youtube.com/watch?v=1pgm8I0B8bY
Not a Mitsubishi, or even a wet road, but I guess it can happen to anyone :facejump: :ninja:
KWAWD
16-04-2014, 11:01 AM
https://www.youtube.com/watch?v=1pgm8I0B8bY
Not a Mitsubishi, or even a wet road, but I guess it can happen to anyone :facejump: :ninja:
Not wet, not AWD, not Mits .. not relevant? Looks like the driver collapsed, no brake lights show up.
But i agree that you've got to be careful when driving, especially in the wet.
One of the problems i noticed straight off with the AWD is that it promotes over confidence. Physics still rules though.
Madasacutsnake
16-04-2014, 11:45 AM
Not wet, not AWD, not Mits .. not relevant? Looks like the driver collapsed, no brake lights show up.
But i agree that you've got to be careful when driving, especially in the wet.
One of the problems i noticed straight off with the AWD is that it promotes over confidence. Physics still rules though.
Relevant? Maybe not, but it's kind of funny. :beer:
I'd say a Lamborghini would promote sell confidence. :facejump:
Tlmitf
16-04-2014, 07:23 PM
My only experience with AWD was a 1990 Liberty.
On a wet clay road, i could feel the power feeding all over the place as the car squirmed and squirred all over the place. If I was in my RWD on the same road, i would have been into the ditch.
In that tail out situation, dont ever lift off!
I do remember a piece of advice given by simon evans. He said you have two chances to catch the tail of an AWD, after the third fish tail you have built up too much momentum and wont be able to recover.
Sounds like what your feeling is the rear diff locking up, which will cause the inside rear to break traction. This will load up the outside tire more and bring the sway bars into play as the rear changes attitude.
You may not be loosing rear grip in the traditional sense, but rather are feeling the change in line as the rear suspension changes geometry and the weight moves. This lets you know that your near the limit of grip before it lets go completely.
Mind you, like I said, subaru background and not a scrap of Mitsi AWD experience...
In that tail out situation, don't ever lift off suddenly, but do ease up.
Trust me, if you keep the foot down while the tail is sliding, it won't end up well. - Skid pan testing - after the 3rd tank slap, it looped around and went backwards a long way before stopping.
ROFL - I typed that reply after only reading the first line of TLMITF "In that tail out situation, don't ever lift off". Now I've read the next 2 lines and I will tell you the Magna is exactly like Evans described.
I've just moved to a Subaru Forester with about 60% more power. It's pretty violent when it's trying to find traction. I much prefer the Magna's AWD, but maybe it's just more gentle due to more weight = more grip and less power = less "violence". :)
KWAWD
17-04-2014, 06:09 AM
Sounds like what your feeling is the rear diff locking up, which will cause the inside rear to break traction. This will load up the outside tire more and bring the sway bars into play as the rear changes attitude.
You may not be loosing rear grip in the traditional sense, but rather are feeling the change in line as the rear suspension changes geometry and the weight moves. This lets you know that your near the limit of grip before it lets go completely.
Why would the LSD lock up in that situation? Does it increase torque to the outside wheel which is turning faster?
WytWun
17-04-2014, 07:40 PM
No, it is actually feeding more torque to the inside wheel to limit the slip between the two driveshafts. With the effective weight transfer towards the outside wheel, the inside wheel has less traction and the extra torque then results in breaking what traction is left.
Magna_Ninja
18-04-2014, 01:44 AM
What brand are the tyres? I used to have this happen on an old Peugeot with cheap brand tyres. Lower profiles tyres may suffer in the wet too. Just food for thought.
KWAWD
18-04-2014, 10:28 AM
No, it is actually feeding more torque to the inside wheel to limit the slip between the two driveshafts. With the effective weight transfer towards the outside wheel, the inside wheel has less traction and the extra torque then results in breaking what traction is left.
Its hard to get the head around it for some reason, at least it is for me this morning, hehe...is there any interactive model on the web that can show what a LSD is doing under driving conditions?
What brand are the tyres? I used to have this happen on an old Peugeot with cheap brand tyres. Lower profiles tyres may suffer in the wet too. Just food for thought.
They're Yoko C series 2's with "orange peel" construction with heaps of tread as they're only a couple years old, i think. Standard size. I notice they're wearing a lot slower than the Series 1's on the KH, and they wear pretty evenly all round too so i dont even bother to rotate them. Pressure is 34psi all round. I've found these tyres to be very grippy.
But i think this "slip" i noticed is normal operation, just interesting cos its the first time i've experienced the traction to slip in this car. And as i said its literally momentary and then it self corrects.
Magna_Ninja
18-04-2014, 11:16 PM
They're Yoko C series 2's with "orange peel" construction with heaps of tread as they're only a couple years old, i think. Standard size. I notice they're wearing a lot slower than the Series 1's on the KH, and they wear pretty evenly all round too so i dont even bother to rotate them. Pressure is 34psi all round. I've found these tyres to be very grippy.
But i think this "slip" i noticed is normal operation, just interesting cos its the first time i've experienced the traction to slip in this car. And as i said its literally momentary and then it self corrects.
Then pretty safe to eliminate that as a problem. Thought it was worth suggesting anyway :)
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