Is the STI going to have a front diff Limited Slip?
Guest
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Is the STI going to have a front diff Limited Slip?
all,
This is complete BS speculation, but I think that the higher engine weight and bigger breaks will lead to a more nose-heavy design and potentially worse understeer than the stock WRX.
What do you all think?
I was hoping that they would use a front limited slip as well as the rear. So far, i have only heard about the rear limited slip...What's the deal?
This is complete BS speculation, but I think that the higher engine weight and bigger breaks will lead to a more nose-heavy design and potentially worse understeer than the stock WRX.
What do you all think?
I was hoping that they would use a front limited slip as well as the rear. So far, i have only heard about the rear limited slip...What's the deal?
Guest
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Re: Is the STI going to have a front diff Limited Slip?
Originally posted by SOULFLY
all,
This is complete BS speculation, but I think that the higher engine weight and bigger breaks will lead to a more nose-heavy design and potentially worse understeer than the stock WRX.
What do you all think?
all,
This is complete BS speculation, but I think that the higher engine weight and bigger breaks will lead to a more nose-heavy design and potentially worse understeer than the stock WRX.
What do you all think?
Which they don't.
Guest
Posts: n/a
The Brakes wont affect the weight distribution because they are bigger on both ends.
The transmission is heavier but that too is located near the middle of the car.
The only major component that MIGHT shift the weight distribution forward is the engine. We dont know yet whether the engine will be heavier than a 2.0 STI unit.
The transmission is heavier but that too is located near the middle of the car.
The only major component that MIGHT shift the weight distribution forward is the engine. We dont know yet whether the engine will be heavier than a 2.0 STI unit.
Dork
Joined: Nov 2002
Posts: 144
From: SF Bay Area
Car Info: 2005 STi, 2005 OXT
Hello,
http://www.subaru.net - all the relevant information is posted there. It's an unofficial site, of course, but it's well designed and maintained (by a dealership!).
Joel
http://www.subaru.net - all the relevant information is posted there. It's an unofficial site, of course, but it's well designed and maintained (by a dealership!).
Joel
Dork
Joined: Nov 2002
Posts: 144
From: SF Bay Area
Car Info: 2005 STi, 2005 OXT
Hello,
Just looked around quickly... "Suretrac" has an interesting legal history. The name has been fought over a few times. Right now, I see two users of the "suretrac" name for differentials.
The USPTO has a "live" registration on the "Suretrac" trademark for the Dyneer Corporation. This company is somehow affiliated (I didn't look up the exact relationship) with TracTech, the maker of Detroit Lockers. They sell a "Suretrac" heavy duty differential that is a clutch type differential. It's probably not ours, though, since it's designed for axles rated 10k pounds or greater.
The second trademark is to Automotive Products plc of the UK. However, this trademark is "dead" and a Federal Court said that AP could not tack its use of the name to the mid 80s when they were actively using their trademarked "suretrac" name. I believe this is AP as in AP Racing. The AP Racing Suretrac differential is the one that was used in the UK STi so it's probably the one we're getting here. That differential is also a clutch-type LSD.
So, I'm guessing that SoA's marketing folks made a boo-boo? Suretrac is clutch-type and not viscous.
Meanwhile, by mechanical rear, I assume they mean some sort of torsen diff, right?
Joel
Just looked around quickly... "Suretrac" has an interesting legal history. The name has been fought over a few times. Right now, I see two users of the "suretrac" name for differentials.
The USPTO has a "live" registration on the "Suretrac" trademark for the Dyneer Corporation. This company is somehow affiliated (I didn't look up the exact relationship) with TracTech, the maker of Detroit Lockers. They sell a "Suretrac" heavy duty differential that is a clutch type differential. It's probably not ours, though, since it's designed for axles rated 10k pounds or greater.
The second trademark is to Automotive Products plc of the UK. However, this trademark is "dead" and a Federal Court said that AP could not tack its use of the name to the mid 80s when they were actively using their trademarked "suretrac" name. I believe this is AP as in AP Racing. The AP Racing Suretrac differential is the one that was used in the UK STi so it's probably the one we're getting here. That differential is also a clutch-type LSD.
So, I'm guessing that SoA's marketing folks made a boo-boo? Suretrac is clutch-type and not viscous.
Meanwhile, by mechanical rear, I assume they mean some sort of torsen diff, right?
Joel
Registered User
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Joined: Dec 2002
Posts: 10,029
From: Sacramento CA
Car Info: 02 Impreza WRX sedan
Originally posted by Joel Gat
...Mechanical means not Viscous. Mechanical includes clutch-type and gear-type. Torsen diffs are thus mechanical, too.
...Mechanical means not Viscous. Mechanical includes clutch-type and gear-type. Torsen diffs are thus mechanical, too.
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Dork
Joined: Nov 2002
Posts: 144
From: SF Bay Area
Car Info: 2005 STi, 2005 OXT
Hello,
Active diffs are almost always of the clutch-type. They typically rely on increased oil pressure to increase clutch lockup. This is how the Porsche and Nissan (Skyline) systems work.
Mechanical:
Clutch
Torsen (worm gear)
Planetary Gear
Viscous
Open
These are the three groups. Of them, I believe the following can be actively controlled:
Planetary
Clutch
BTW, I also used to be under the impression that Suretrac diffs were typically 2-way diffs. However, I sort of doubt Subaru would use a 2-way front diff. This would prevent tire lockup under braking, but would not allow a differential in speed under braking. That would counter the effect of ABS in that you would lose steering during braking / you would understeer. I think.
Now I wonder...
Joel
Active diffs are almost always of the clutch-type. They typically rely on increased oil pressure to increase clutch lockup. This is how the Porsche and Nissan (Skyline) systems work.
Mechanical:
Clutch
Torsen (worm gear)
Planetary Gear
Viscous
Open
These are the three groups. Of them, I believe the following can be actively controlled:
Planetary
Clutch
BTW, I also used to be under the impression that Suretrac diffs were typically 2-way diffs. However, I sort of doubt Subaru would use a 2-way front diff. This would prevent tire lockup under braking, but would not allow a differential in speed under braking. That would counter the effect of ABS in that you would lose steering during braking / you would understeer. I think.
Now I wonder...
Joel