Hello,

I just wanted to stop in and introduce myself as one of the newest sponsors here on the board. I know that you guys don't seem to get as much tuner love as the GT2's, GT3's and Twin Turbos. I just want to let you know that we do support your cars with a couple of differential options.

We offer a torque biasing differential. This is a gear driven differential and tends to be the differential of choice for guys driving hard on the street and doing auto-x.

Our other product is a true locking clutch style LSD. We offer it with your choice of 40/60 locking or 50/80. This is available as both a 6 plate and a 4 plate design.

If you've got any questions about either of these items, how they function or any other general gearbox questions please feel free to post them up in this thread. I will also be putting together a special offer on one of those diffs in the near future. So, if you've been thinking about buying one, speak up and tell me which one you want on sale. You might influence my decision if a bunch of people want one product and not the other.

In the meantime, all of our GT brand product carry a standing 5% discount for 6speedonline members. So if you call up or email us looking for anything please make sure to mention that you are a member. This applies not just to the 997 stuff, but if you've got a 911,914,944, or a 930 that's a weekend racer or anything like that you get the discount on those cars as well. We are a full service Porsche transmission parts manufacturer making gearsets, differentials and other internals for pretty much every variant of car that Porsche has made to date.

Kind Regards,

Matt

 

Matt, Thanks for sponsoring this site, it is not posible without great vendors like yourself.

I have one of your competitor's differentials, but have heard a lot of great things about your product. I am not sure if it is a type O, but I highlighted something that doesn't make sense to me. If it isn't a type O can you explain how it works.

 

Hello Northvan,
Thanks for the welcome. Something I should tell you about myself is that I don't consider my competitors' names dirty words. You will NEVER see me speak ill of another vendor. I just don't believe in negative advertising. I will tell you what my product does and how it does it. I will also openly discuss how ALL of the products do what they do. I'm a total tech junkie at heart and tend to approach things as educator and student more than a guy trying to make a buck. People will decide on their own if what I have to offer is what's right for them. My definition of a good day is if I managed to learn something new.

The reason I say this is I'm not really sure what you are asking with your reference to "type O". I see you have highlighted 50/80 but I'm not sure what you are asking. If you can give me a little bit more to go on I'd be more than happy to answer your question to the best of my ability. Feel free to name names if you want, so I know what we're talking about. Under site rules I am not supposed to make performance comparisons of my product to any other vendors but I don't think that stops me from discussing the mechanical aspects of how these things work and do what they do.

 

Guards makes the best Porsche gears sets and diffs on the market IMO- have used their stuff. Top notch. If they don't have it they can make it

 

Wow. Strong words of support. Thank you.

 

Just wondering if it should be 50/50 or how the technology works 50/80 works? I want to understand how these things work.

Sorry if I have confused you.

 

Thanks, this forum really helps people like myself, that knows the basics about cars, learn more in detail about them...... thanks will keep in touch...

 

I believe what NorthVan is referring to is how can you have a 50% locking differential with 80% slipping yielding 130% (or perhaps it's the other way around) ? I am not exactly how lsd's work either so I believe some insight on the inner workings and mechanism of a lsd might help.

 

Hello,
Ok. I think I am on board now. You weren't using Type-O to refer to another brand. You were wondering if it was a typo, as in a mistake.

It's not a mistake. That's our most aggressive motorsports setting. One of the things about our differentials is that we have assymetrical ramps. This allows us to have different lock up percentages on acceleration versus deceleration. And that brings up a good point about how LSD's work. A real LSD when it's locked, it's locked. There is no partial locking. When someone refers to the locking percentages of a differential, what they are talking about is the difference in wheel speeds before they lock. It's not how locked it is. It's how much wheel spin does it take before it locks. When I saw 50/80 it means on acceleration it's a 50. On deceleration it's an 80.

The advantage of running a really aggressive deceleration lock ramp is that it keeps the 911's rear end in check. Historically, the greatest handling problem with a 911 is that if you trail brake into the turn and then get off the throttle the back end wants to come around. With the newer chassis they have made great strides in retuning the suspension to prevent that loose rear end. But it's still not perfect. Adding an LSD improves that. By locking the rear wheels together on corner entry you can dive deeper and harder than you ever could on an open differential.

I've seen guys advertising other differentials talk about how our LSD makes a car push on corner entry. It's supposed to. It's doing exactly what it was designed to do. The 911 in stock form is tail happy. By making the car understeer more it's giving it more even handling than it did out of the box. And that understeer will really only be noticed on the slowest corners where the speeds are lower and the downforce is less. At higher speeds the cars tend more towards neutral handling and you rarely if ever hear complaints about the cars pushing at speed. If they do, a suspension adjustment to loosen up the front end a little bit is generally all that is required to correct it.

Once you are on the throttle, you don't want the differential to lock up so quickly. That's why the 50 setting is used on that side. When you get off the brakes and transition to part throttle, the differential acts like an open diff again.This facilitates the turn through the apex and lets you get on full throttle sooner on corner exit. With many of these cars, it's really easy to get on the throttle too hard, too soon which will generally just spin the rear tires.The 50 setting allows a bit of wheel spin on the un-weighted inside tire before it locks, but with the LSD, when you nail it like that, you're going to get power to the ground instead of smoking that inside tire that so many guys running open diffs complain about. With the LSD that power is instead going to the outside tire and pushes you through the turn and onto the straight more quickly.

Make sense?

 

Thanks for the explanation Matt. It does make sense!

 

Matt, Thanks for the explanation, it makes more sense now.

BTW I have a Type Q not O

 

I want to point out that I bought my Type Q (Quaife) differential from Matt last year, and just confirmed with him that he is the same guy. I have to say that Matt is a very honest and reputable guy, you can trust this guy, and given the chance would buy from him again.

Welcome to 6speed Matt!

 

Good to know! Thanks Ed.

 

Small world. As Ed mentioned, my previous business was both a Guard and Quaife dealer. Obviously, since Guard is now my own business and I am not just a customer anymore I will be selling just the one brand, ours. However, I should mention that we do make a torque biasing differential, which functions pretty much mechanically the same way as brand "Q". It's just ours instead of theirs.

 

Bump so that anyone interested in a differential has a place to discuss the pros and cons of the various versions if considering taking us up on our special offer listed in the classifieds...

https://www.6speedonline.com/forums/...ml#post2657246