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4WD & AWD systems explained

1389 messages,  Last post on Feb 21, 2010 at 11:13 AM

You are in the SUVs Forum. Your Hosts are steve_ & tidester

What is this discussion about? Chevrolet Suburban, Jeep Grand Cherokee, Subaru Outback, Ford Explorer, Nissan Pathfinder, GMC Envoy, Performance Mods, Tires, Suspension, Transmission, Truck, SUV


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#1271 of 1389
Re: Proof that 90/10 is not the limitation [chelentano] by ateixeira
May 19, 2008 (6:58 am)
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Replying to: chelentano (May 18, 2008 11:13 pm)

We're talking about 2 different things.
 
One is the default power split, which you keep saying is 90/10, but the letter from SoA contradicts that.
 
The other is the maximum torque to the front wheels, which the FWD mode proves can be 100%.
 
You bragged about the Outlander having this capability (why else would you bring that up unless you thought the Forester could not?), well, the Forester does too.
 
My ramp challenge still stands. We've all seen a Forester with the electronically controlled variable transfer clutch successfully climb with only one axle at a time, the question is can the Outlander do the same thing?
 
Furthermore, the Forester should be re-tested to determine if it's traction/stability control system can succeed at shifting power side to side, since we already know it can do it front to rear.
#1272 of 1389
Re: Proof that 90/10 is not the limitation [chelentano] by ateixeira
May 19, 2008 (7:23 am)
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Replying to: chelentano (May 18, 2008 11:13 pm)

Fuses
 
The Outlander doesn't have fuses? Does it have a circuit breaker or something? I'd love to see that.
 
20-year old part-time awd systems
 
It's full-time, always adjusting. The fact that you still make that claim shows you know little about it.
 
contrast to the Evo's Twin Clutch SST marvel
 
November 07, Straightline:
 
"the all-new Mitsubishi Evo has hit a snag with its Dual Clutch transmission. It turns out that some last-minute glitches have turned up"
 
Here's Autoblog's take on the same issue:
 
http://www.autoblog.com/2007/11/11/dual-clutch-transmission-delayed-for-mitsubis- - hi-evo-x/
 
Personally, I marvel at the fact that only 44% of Mitsubishi customers are satisfied with dealer repairs, so I wouldn't want to be the first guinea pig to take my chances with something unproven.
#1273 of 1389
Re: Proof that 90/10 is not the limitation [chelentano] by kdshapiro
May 19, 2008 (8:07 am)
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Replying to: chelentano (May 18, 2008 11:13 pm)

interesting contrast to the Evo's Twin Clutch SST marvel :--)
 
Isn't that 60 year old technology as well? Just want to be clear Subaru isn't the only manufacturer to use old and outdated technology. :shades
#1274 of 1389
Re: Proof that 90/10 is not the limitation [kdshapiro] by ateixeira
May 19, 2008 (8:19 am)
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Replying to: kdshapiro (May 19, 2008 8:07 am)

I'm sure they will get it right eventually, but I would not want to be the guinea pig for that transmission.
 
Think about it - the Outlander is much heavier than the EVO and carries a much bigger payload.
 
I was the one that told chelentano that transmission was on the way, but the postponement happened so who knows if it will be ready for the Outlander this fall.
#1275 of 1389
Re: Proof that 90/10 is not the limitation [ateixeira] by chelentano
May 19, 2008 (3:55 pm)
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Replying to: ateixeira (May 19, 2008 6:58 am)

>> One is the default power split, which you keep saying is 90/10, but the letter from SoA contradicts that.
  
Wrong. That’s what SoA says in that letter, and note, that the word NEVER is all-capped by Subaru: “It will NEVER be 0/100 or 100/0. Each wheel/axle will always have some power. It is never that all power is to either axle.”
  
…also from Subaru Director Mike McHale: “the front to rear split is based upon the lockup percentage of the transfer clutch, which could be as diverse as 90/10 or up to 50/50 depending on power input/grip needs”. Same were said by several other credible independent online sources. What other evidence do you need? Do you really think you know more than NY Times, cars101.com, Wikipedia, Popular Mechanics, Edmunds.com, Car and Driver and Subaru of America? “I guess you can't handle being wrong”.
.
  
>> The other is the maximum torque to the front wheels, which the FWD mode proves can be 100%.
  
It proves nothing. The existence of “fuse” interface is not a prove, it’s your wishful thinking. They might just left it for future development. The Outlander, for instance, has fuses for Wiper Deicer, Headlight Washer, and Power Liftgate. Does it mean I can say now, that the Outlander has Power Liftgate feature? Cool, gang, I gotta power liftgate!
  
“I guess you can't handle being wrong”.
.
#1276 of 1389
Re: Proof that 90/10 is not the limitation [ateixeira] by chelentano
May 19, 2008 (3:56 pm)
Reply

Replying to: ateixeira (May 19, 2008 6:58 am)

>> My ramp challenge still stands. We've all seen a Forester with the electronically controlled variable transfer clutch successfully climb with only one axle at a time
  
You are bragging again about that Subaru sales video made at Subaru dealership. A subaru salesman is the last person I’d trust. May be Forester can power up a ramp in subaru paid video at subaru dealership, but otherwise it's seems to be tough to do in a real life conditions. The humiliating Subaru AWD real life uphill performance is well depicted here:
  
http://www.youtube.com/watch?v=-tMgWtlxeb8&NR=1
http://youtube.com/watch?v=g6H3IOtE6Q8
http://www.youtube.com/watch?v=guTQWkpPFa4
#1277 of 1389
Re: Proof that 90/10 is not the limitation [kdshapiro] by chelentano
May 19, 2008 (4:02 pm)
Reply

Replying to: kdshapiro (May 19, 2008 8:07 am)

>> interesting contrast to the Evo's Twin Clutch SST >> Isn't that 60 year old technology as well?
 
Some 60-year old technologies still remain advanced for many with limited financial and technologial resources. Nuclear technology is a good example.
#1278 of 1389
Re: Proof that 90/10 is not the limitation [chelentano] by kdshapiro
May 19, 2008 (5:30 pm)
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Replying to: chelentano (May 19, 2008 4:02 pm)

Some 60-year old technologies still remain advanced for many with limited financial and technologial resources. Nuclear technology is a good example.
 
Well I guess the STIs 20 year old technology is better, and more advanced than the EVOs 60 year technology. On the track the EVO would rule, on a dusty, dirty rallye type trail the STI would rule. A good example of technological acheivement being less useful.
#1279 of 1389
Re: Proof that 90/10 is not the limitation [chelentano] by kdshapiro
May 19, 2008 (5:31 pm)
Reply

Replying to: chelentano (May 19, 2008 3:55 pm)

What other evidence do you need? Do you really think you know more than NY Times, cars101.com, Wikipedia, Popular Mechanics, Edmunds.com, Car and Driver and Subaru of America? “I guess you can't handle being wrong”.
 
Well, yes if you talk to the right people to find out the "real" story. :shades OR, you can't admit someone might know something you don't
#1280 of 1389
Re: Proof that 90/10 is not the limitation [kdshapiro] by chelentano
May 19, 2008 (5:49 pm)
Reply

Replying to: kdshapiro (May 19, 2008 5:30 pm)

>> Well I guess the STIs 20 year old technology is better, and more advanced than the EVOs 60 year technology.
 
Well, you "guess" in fact! What's the STIs 20 year old technology? 6-speed manual tranny? It's little longer that that. The subaru AWD is in fact 20-years old, while EVO's Twing Clutch SST and S-AWC AWD both are brand new generation.
.
 
>> on a dusty, dirty rallye type trail the STI would rule.
 
"Would"? That's your wishfull thinking :--)

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