07MontRedcp

Have you guys observed any problems with the Quaife such as the ones Doug @ ECS mentioned?

BJK

0TJ@RPMtransmissions

When quaife changed thier distributers here in the US, they had to make thier own shafts as the previous supplier made the shafts for them. The new shafts that were made were not nearly strong enough for most corvette racers and they broke.
When a shaft breaks in the quaife it instantly overspins internally and it will gall the side gear within the case.

When we install quaifes in a higher powered car they always get both 300M shafts. In this configuration we haven't had any fail.

07MontRedcp

That is very good info. Thankfully, I already have beefed up output shafts in my diff.

BJK

BoosterClub

I would imagine the torque transfer between sides could cause this. More torque on one side would steer the car away from that side. Of course any diff losing traction on one side could do this, but it would be exacerbated with the torque transfer, just a gut feeling. I never really liked the principles behind the quaife, maybe because it's hard to fully understand. Maybe that's why I like the OSgiken, apply torque, wheels lock, end of story (not really).

I believe also the quaife acts to try to force no wheel slip at all, but some wheel spin is advantageous for traction.


Yea, not sure how good the factory diff is, but a lot of OEM diffs will be overpowered and slip. Not sure what the specs are on the OEM diff, anyone know?

C6RAPTOR

The oil cooler that DRM has is only one for the C6 and it is installed below the rear back up light. He also has one for a C5 Zo6 that is installed under the rear fender using the rear brake cooling duct.
This is a photo Randy sent me before I installed the cooler. Note that the pump is electric. I used a Zo6 type pump in my new ZIP Corvette Quiaife LSD.
The next time I put my Vette on the lift I will take photos of my LSD & Cooler. Randy said that the cooler will drop the oil temp by 40 deg F

C6RAPTOR

There is a new player that was an old player in the Torque Biasing LSD game.
Last summer I had a new Race Duty Quaife LSD built and I installed it in my Corvette track & street car. I really liked the performance of the new LSD at Watkins Glen & VIR race tracks.

Last evening Andrew Gleasman, the VP of sales for Torvec gave a talk at our local Rochester Corvette Club meeting on the IsoTorque LSD. They said it was considerably better that the Quaife LSD that they tested showing much faster cornering speeds.
They had performed test at Watkins Glen International Raceway
When I got home from the meeting I searched out comparisons’ on the Quaife VS IsoTorque and I found a post on the following web site on the subject:
http://www.350zmotoring.com/forums/g...e-sign-up.html

I copied the following statement by Andrew Gleasman from the 350Z post:

“The Quaife is a parallel axis differential and has a torque bias ratio of only 2:1, meaning that if you have one wheel on grass and one on pavement the difference in the coefficient of friction of the two cannot exceed 2:1 or one wheel would spin up like an open diff. Meaning once the internal friction of the gears binding is overcome the wheel will spin. The viscous unit and the clutch type both have roughly a 2:1 bias. The Quaife and other parallel axis differentials are an offshoot of my grandfathers patents for cutting small number of teeth without under cut in 1951.

The IsoTorque and the Torsen type 1, are called cross axis differentials, they do not use internal friction to prevent will spin and they do not bind. The Torsen currently has a bias of 3.5:1 – 4:1, but the improvements on the IsoTorque are upwards of 8:1 torque bias. This ratio allows the IsoTorque to drive a split coefficient of something like Ice under one wheel and pavement under the other. The added benefit is when going around a turn if need power can be sent to the outside wheel with the most grip up to 8x that of the inside wheel helping turning and safety.

The IsoTorque has no limitation on where it can be installed, either the Z with the open diff or like our test car 35th Anniversary with the LSD, it is compatible with all traction controls, ABS or stability control systems.”

I sent Quaife an email asking them what they thinks about this comparison. Is all of this bias ratio data correct? Is power of 8X ever needed on the outside wheel of that of the inside wheel?
I told Andrew that I have a Quaife LSD and I like it very much in comparison to the OEM LSD . They offered to change my Quaife for their IsoTorque at their shop so I could see the difference. That offer is not realistic because I do not have a problem with my new Quaife LSD and I have too much time and money in the installation that included a diff. oil cooler system, polished gears and special race bearings etc.
I had tried to purchase a IsoTorque LSD last year before I desided on the Quaife. I found that Torvec did not yet have the IsoTorque ready for market at that time for the Corvette but Quaife did.
It would have been nice to have a LSD that was made in the USA!
The Torvec factory is 35 miles from my home in Rochester NY.
We were told at the RCC meeting that the Torvec LSD is going to showing up on some new performance cars as a OEM part. They would not tell us what car , but former GMHP Div. Engineer and driver John Heinricy now works for Torvec??

blown81bu

Im on the fence of getting a qualfe or not..high hp drag...and mostly street...is it really worth 900 more over carbon clutches?

SinisterC6

I like my quaife, I will a test to the feeling you are all asking about as it is similar to my AWD car accelerating hard in the snow. You floor it and the rear wiggles about one inch side to side but the tirs stay hooked. To me its the warning that anymore power would lead me to spinning.

As far as a dependable and durable differential look no further than the Quaife for your high HP needs.

Chris Stewart

Mine has been running great for about 5 years now. In my experience the rear dances less than with clutches. With this thing it digs in and stays straight much better, especially on the shift.

Shoaf85

I agree with both posts above. My last 3 corvettes were clutched diffs and those cars would always start going sideways when the tires were spinning hard. My current car is the first corvette I have driven with a Quaife and even when boiling the tires or just lightly spinning them the car stays very straight and predictable and any speed.