MFactory LSD group buy discussion thread

[ZX2guy19]

My car makes ~340whp/320wtq, but at the time it broke, I was running low boost and probably only around 250whp.

Yeah, but like I said, I think the case is the next weak link. If the case cracks/flexes, it doesn't matter how strong your gears are...

--Ferdi

I am going for 355whp, so I'm really hoping it won't be a problem.

And good to know rieldeal, I didn't know we had a revised case.

[therieldeal]

yeah the g-series case was redesigned somewhere along the way. it seems all the larger chassis 4 cyl and v6 vehicles got the stronger case initially (probe, 626, etc), and then around the obd2 switch the smaller chassis 4 cyls got them as well. the main difference is a stronger casting in the pinion gear area, right where Ferdi's blew out. the ring and pinion gears are also wider/stronger with the revised case, the secondary shaft is actually longer to accommidate this change in gear width. this is why not all g-series gearsets can be swapped as complete units

[Inspector 24]

I've had three race days on the diff now and I am very happy with the results.

Keeping in mind the last diff I had was a well worn OPM unit, which I was very happy with for a long time. It was simply due for a re-freshing. The biggest difference from the OPM to this diff, the OPM would prevent inside wheel spin, where this diff actually PULLS me around corners.

But first, the thing it will no doubt be used for most, and everybody does first. Launching. It is a joy with this diff, I'm definitely able to put down more power than previously with less hopping (none yet) and the car tracks straight and true when the wheels are spinning. I have yet to do a full drag launch on sticky tires at high RPM, but there's plenty of others that will.

Now the important stuff. LOTS of diffs can help a launch, not every diff can make a car faster around corners. This one does. Even in 1st gear tight corners I'm able get on the gas well before the apex. Under full power in 1st the car will pull itself around a corner, it feels like the car is bending around itself. There is no longer ANY on throttle understeer. As long as the car isn't already understeering I can go full throttle and let the diff do the work.

Even in limited traction situations (I.E. Wet) and sharp 1st gear corners, I can hear the inside tire trying to break loose, but there is no signifigant loss of traction, and I'm able to get through a corner under full power.

Slaloms are better as well, which I didn't expect. Because of the difference in how the diffs operate with this diff I'm able to transition much faster with less steering effort, on the gas I don't feel the diff fighting me, it simply maintains traction and pulls me right around cones as needed. It truly transfers torque so much faster it keeps up with even very fast steering and throttle inputs.

In short, I'm completely satisfied. I highly recommend the diff to EVERYBODY.

[therieldeal]

[Dan [Sac]]

That's consistent with the reviews coming from the Honda camp as well - if my BG didn't already have an LSD in the box I would have bought a second one.

Gotta edit Carmen's sig now, Ryan

[wheresthericego]

I've had three race days on the diff now and I am very happy with the results.

Keeping in mind the last diff I had was a well worn OPM unit, which I was very happy with for a long time. It was simply due for a re-freshing. The biggest difference from the OPM to this diff, the OPM would prevent inside wheel spin, where this diff actually PULLS me around corners.

But first, the thing it will no doubt be used for most, and everybody does first. Launching. It is a joy with this diff, I'm definitely able to put down more power than previously with less hopping (none yet) and the car tracks straight and true when the wheels are spinning. I have yet to do a full drag launch on sticky tires at high RPM, but there's plenty of others that will.

Now the important stuff. LOTS of diffs can help a launch, not every diff can make a car faster around corners. This one does. Even in 1st gear tight corners I'm able get on the gas well before the apex. Under full power in 1st the car will pull itself around a corner, it feels like the car is bending around itself. There is no longer ANY on throttle understeer. As long as the car isn't already understeering I can go full throttle and let the diff do the work.

Even in limited traction situations (I.E. Wet) and sharp 1st gear corners, I can hear the inside tire trying to break loose, but there is no signifigant loss of traction, and I'm able to get through a corner under full power.

Slaloms are better as well, which I didn't expect. Because of the difference in how the diffs operate with this diff I'm able to transition much faster with less steering effort, on the gas I don't feel the diff fighting me, it simply maintains traction and pulls me right around cones as needed. It truly transfers torque so much faster it keeps up with even very fast steering and throttle inputs.

In short, I'm completely satisfied. I highly recommend the diff to EVERYBODY.

Reading your review makes me want to go outside right now and get that damn thing in the car. I can not wait until its in.

[Inspector 24]

Do'h time to change the sig indeed.

A couple things I just realized re-reading my post. I've put just under 1,000 miles on it of interstate and in town driving, about 300 of which was very windy country roads, and three race days. There has been nothing weird about the diff at all. When you don't need it, it's invisible. Full lock turns in parking lots, backing in and out of places, no noises, no weird steering, no binding nothing.

Second, experiences in handling improvements will certainly vary depending on an individual car's setup/power level. For those with gobs of power, if you have the wheels turned too much, understeer will likely happen as both tires break loose around a corner, the diff does not magically give you more traction, it simply distributes torque evenly between both wheels. If that torque is enough to overcome the available traction of the tires combined with too much steering angle, they will spin and you will understeer. You'll be understeering at a much higher velocity as you're accelerating rather than churing one wheel, but still understeer

And much like any gear type diff, the handling differences are felt only when you're on the throttle. Off throttle it's just an open diff. Don't expect this to magically change every handling aspect of your car, but expect great things when you push the loud pedal

[Beerizfood]

What are people doing about the preload shim ? Are you reusing the old one ?

[therieldeal]

Mfactory's machining tolerances are very very tight, so as long as your stock diff wasn't out of spec the original shim should actually work fine.

If you're worried about it i have the mazda tool set for setting bearing preload. I havent figured out how to use it yet, but if you want to pay a deposit and shipping both ways i could loan it to you.

[ZX2guy19]

Well mine is in the trans and going in the car this weekend. Once again, beautiful quality.

[Shades]

I finally got around to picking up my LSD at the border... thanks again MFactory, that thing looks amazing and that's coming from a machinist. Now to test the functionality.

[Inspector 24]

In action, Vail Valley Colorado. I was in 3rd after the first day, right behind two WRX's when the Bimmer I was leading by .15 came back on day two and beat the WRX's by almost a half second!

So, 4th/9 finish for me, I'm very happy considering the level of competition. Diff was great. I very much look forward to playing with it more, and at nationals.

[smoke187]

that's a nice looking mx6

[theredrocket]

What type of suspension stuff do you have on that MX-6? That thing has almost no lean.

[Inspector 24]

that's a nice looking mx6

Thanks

What type of suspension stuff do you have on that MX-6? That thing has almost no lean.

Tein SS-P 450f 550r springs, AWR 19mm Rear Sway Bar, all poly bushings.

Stiff yes, but still driven to the events. Cushy 50 series tires on heavy wheels make the drive very nice

Though she will lean...Just enough.

http://i61.photobucket.com/albums/h66/dillinr/Carmen/Racing%20Pics/Miller%20June%2020/20090620-20_0243-Copy.jpg

http://i61.photobucket.com/albums/h66/dillinr/Carmen/Racing%20Pics/April%205%20Fair%20Park/IMG_6843.jpg