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Old 04-08-2002, 04:14 PM   #1
aussiebrydon
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Default Manual 2002 WRX vs others in traction

In rudimentary understanding of the 5spd 2002 WRX I understand that there is a simple 50/50 power distribution front/rear, with no limited slip diff. Is that correct?

If so, would a 4EAT MY02 WRX or a VW (ugh) w/ 4motion be more stable on snow, wet pavement etc? Anyone know how the Porsche Carerra 4's tranny works?

Does the current european WRX STI have a more advanced tranny? If so, I might wait to see what tranny upgrades they might give us on the US-spec STI

So my question is, is the manual WRX trading some safety in it's simple transmission for "WAHOOO" factor?

Oh and I've been searchin on this stuff and didn't really find anything helpful
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Old 04-08-2002, 04:39 PM   #2
Frederf
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My little brother knows loads about Porsches. I'll bookmark this post and get his insight later.
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Old 04-08-2002, 04:55 PM   #3
cobra117
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Default 50/50?

Not as far as I knew.

In my limited understanding of Subarus, the center differential is a viscous type unit that will transfer power from front to rear or vice verca should wheelspin start to occur.
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Old 04-08-2002, 05:03 PM   #4
hunter001
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Default Re: Manual 2002 WRX vs others in traction

Quote:
Originally posted by aussiebrydon
In rudimentary understanding of the 5spd 2002 WRX I understand that there is a simple 50/50 power distribution front/rear, with no limited slip diff. Is that correct?

If so, would a 4EAT MY02 WRX or a VW (ugh) w/ 4motion be more stable on snow, wet pavement etc? Anyone know how the Porsche Carerra 4's tranny works?

Does the current european WRX STI have a more advanced tranny? If so, I might wait to see what tranny upgrades they might give us on the US-spec STI

So my question is, is the manual WRX trading some safety in it's simple transmission for "WAHOOO" factor?

Oh and I've been searchin on this stuff and didn't really find anything helpful
The manual-WRX has a simple 50/50 split but has a limited slip differential.

The viscous-coupling of the manual-WRX by its very nature needs slippage before it can act to correct the slippage by shearing the viscous fluid, thus thickening it and locking the differential.

The 4EAT (of the Auto-WRX, not the Auto-RS) on the other hand, employs a Torque-sensing Planetary Gear Center differential (that the Auto-RS does not have) and a 6-plate Electro-mechanical clutch-pack (Auto-RS has a lighter duty 4-plate clutch pack) to rapidly distribute power front/rear as needed. There is no lag in re-distributing power/torque, like with the manual-WRX.

The Passat 4-motion (same as the A4/non-V8-A6 Quattro) is also very effective, since it too has a Torsen center differential, that acts without any lag in re-distributing power/torque as needed. But the Quattro is much heavier than the Subaru system and is starting to be a little dated.

The STi has a more advanced system (when compared to the manual-WRX AWD), since it has got front and rear Sure-trac mechanical differentials, in addition to the Viscous-coupling in the center.

The Mitsubishi EVO VII has a much more advanced system than the STi, with "Active differentials" similar to the Auto-WRX as the center differential, in addition to having front/rear mechanical differentials.

Later...AH
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Old 04-08-2002, 06:14 PM   #5
aussiebrydon
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Default Re: Re: Manual 2002 WRX vs others in traction

Quote:
Originally posted by hunter001


The manual-WRX has a simple 50/50 split but has a limited slip differential.

The STi has a more advanced system (when compared to the manual-WRX AWD), since it has got front and rear Sure-trac mechanical differentials, in addition to the Viscous-coupling in the center.

The Mitsubishi EVO VII has a much more advanced system than the STi, with "Active differentials" similar to the Auto-WRX as the center differential, in addition to having front/rear mechanical differentials.

Later...AH
wow, a veritable library of information - thanks mate that's exactly what I was looking for

oh I do have a question though, is the EVO VII's tranny setup heavier than theSTI's? (sticks both of them) I know the EVO is faster, but is it because of a LOT more power?
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Old 04-08-2002, 10:13 PM   #6
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Default Re: Re: Re: Manual 2002 WRX vs others in traction

Quote:
Originally posted by aussiebrydon


wow, a veritable library of information - thanks mate that's exactly what I was looking for

oh I do have a question though, is the EVO VII's tranny setup heavier than theSTI's? (sticks both of them) I know the EVO is faster, but is it because of a LOT more power?
The EVO's tranny would definitely be heavier than the STis, but it is a LOT more effective and would ensure much better handling.

The EVO is faster because of the extra power and the way it is delivered. Unlike the STi, which is sluggish below 3000 rpm, the EVO VII has a lot of power/torque down in the lower rpms.

The handling is also much better than the STi, due to the better differentials employed. The STi understeers a lot, unlike the EVO.

But on a day-to-day basis, the STi is a lot more livable, while the EVO is more of a one-track race-car, slightly tamed for the street. The EVO is a lot more expensive too, when compared to the STi.

Later...AH
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Old 04-09-2002, 01:30 PM   #7
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I thought the STi just had a regular diff in the middle, without limited slip to allow for parking brake maneouvers? With the WRX, using the parking brake for turning will eventually damage the limited slip (except maybe in snow), while the STi can use the handbrake when it wants without damage.

Edit: Never mind, I went and checked out the Japan website, the center viscous is there.

Last edited by SlideWRX; 04-09-2002 at 01:42 PM.
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Old 04-11-2002, 12:37 AM   #8
aussiebrydon
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it just brings a happy tear to my eye seeing so many automotive gearheads coming together and offering advice on my lowly little thread
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Old 04-11-2002, 02:40 AM   #9
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actually the new STi has an electronically controlled center diff, the blank space next to the mirror adjustment thing on the WRX is where a wheel is put in the STi and you adjust the diff but that is all I know.
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Old 04-11-2002, 09:31 AM   #10
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Quote:
Originally posted by tifosi77
actually the new STi has an electronically controlled center diff, the blank space next to the mirror adjustment thing on the WRX is where a wheel is put in the STi and you adjust the diff but that is all I know.
I thought that is only available in 22B not STi. AFAIK, STi has the same center diff as regular WRX.
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