F23 LSD OBX vs Quaife
10-15-2014, 11:55 AM
#1
F23 LSD OBX vs Quaife
I know this doesn't apply to many on this forum but I felt like this article was too good not to post. OBX vs Quaife (with pixors) - Drivetrain - HybridZ
10-20-2014, 02:01 AM
#4
OBX arent terrible units, but they are cheap for a reason, its the age old saying, you get what you pay for. Neon guys were using them with large amounts of success if they replaced the washers with heavier duty versions in a different stack pattern, then the thing would work just fine.
10-28-2014, 10:21 PM
#8
Google quaife. Understand how it operates. If the car under steers and rolls a lot the Inside wheel will squawk the gears do not Like it. I use high helix quaife and the car has awesome handling I got no squawk at all. If the axle seals leak it's not the quaife assuming it's installed properly and in good condition.
10-28-2014, 10:40 PM
#9
10-29-2014, 03:45 PM
#10
interesting update.. after another phonecall with quife and the shop, they think its because the spindle sits higher than the transmission output, so the slip angle is off and making it ride. Only thing i dont get is why didnt it leak for the year prior to the trans rebuild that the car was on coilovers.
Trying to think about how to properly remedy this.
Trying to think about how to properly remedy this.
10-29-2014, 06:45 PM
#11
interesting update.. after another phonecall with quife and the shop, they think its because the spindle sits higher than the transmission output, so the slip angle is off and making it ride. Only thing i dont get is why didnt it leak for the year prior to the trans rebuild that the car was on coilovers.
Trying to think about how to properly remedy this.
Trying to think about how to properly remedy this.
12-06-2014, 10:50 AM
#14
indeed. Thats true. But the quaife is a very good unit as it sits.
I think your issue is coil overs; when you go to coil bind and run out of suspension travel bad things happen. Unlike the F35 cars, the F23 Cobalt has a really long passenger side axle shaft and that can be part of your problem. Going too low with suspension is 100% slower on the track than a car with higher trim height and sufficient ride travel to eliminate bottoming on the suspension.
Too low is not good. Although for sure its better aerodynamically to be about 2 inches or lower off the ground, the inefficiencies gained have to be plotted against practicality and require design change.
I made a Z06 with a seq. gearbox and a flat carbon undertray and 2 inches of ride height at the splitter. The car bottomed in the trailer when unloading, in the paddock also, so was difficult just to get on the track. Once on track the gains were there, about two tenths a lap, but the gearbox overheated and seized the seq shift rod; in the end we had to raise the car back up, and remove part of the carbon undertray to get the transmission to live. The trans had its own pumps and coolers, but they cannot overcome heat soak when the car stopped running.
On this Z06, to achieve that ride height with suspension travel, we installed special cast drop spindle knuckles at a cost of $5,000.00. The carbon honeycomb undertray was 3500.00 The seq gearbox was 40,000.00
The least expensive mod on the car was the area47 tune. Including air fare. That car was was built in 2006-2007 and the tune is still good to this day. 600+ whp.
I would guess that on your Cobalt, with our spherical cabs, rear beam inserts, rear bar and YYZ springs with decent struts and shocks you would sit higher, have less issues and go faster. But thats for you to decide. In the meantime raise the car up and check the transmission bearings; you can remove the axles and run a correctly sized small diameter pipe through the quaife and see if there is play discernible in the quaife unit which would indicate a bearing issue perhaps. I am clutching at straws here, as otherwise, it takes complete disassemble of the transmission
I think your issue is coil overs; when you go to coil bind and run out of suspension travel bad things happen. Unlike the F35 cars, the F23 Cobalt has a really long passenger side axle shaft and that can be part of your problem. Going too low with suspension is 100% slower on the track than a car with higher trim height and sufficient ride travel to eliminate bottoming on the suspension.
Too low is not good. Although for sure its better aerodynamically to be about 2 inches or lower off the ground, the inefficiencies gained have to be plotted against practicality and require design change.
I made a Z06 with a seq. gearbox and a flat carbon undertray and 2 inches of ride height at the splitter. The car bottomed in the trailer when unloading, in the paddock also, so was difficult just to get on the track. Once on track the gains were there, about two tenths a lap, but the gearbox overheated and seized the seq shift rod; in the end we had to raise the car back up, and remove part of the carbon undertray to get the transmission to live. The trans had its own pumps and coolers, but they cannot overcome heat soak when the car stopped running.
On this Z06, to achieve that ride height with suspension travel, we installed special cast drop spindle knuckles at a cost of $5,000.00. The carbon honeycomb undertray was 3500.00 The seq gearbox was 40,000.00
The least expensive mod on the car was the area47 tune. Including air fare. That car was was built in 2006-2007 and the tune is still good to this day. 600+ whp.
I would guess that on your Cobalt, with our spherical cabs, rear beam inserts, rear bar and YYZ springs with decent struts and shocks you would sit higher, have less issues and go faster. But thats for you to decide. In the meantime raise the car up and check the transmission bearings; you can remove the axles and run a correctly sized small diameter pipe through the quaife and see if there is play discernible in the quaife unit which would indicate a bearing issue perhaps. I am clutching at straws here, as otherwise, it takes complete disassemble of the transmission
12-12-2014, 12:39 AM
#15
Senior Member
Just curious if you've tried those axle seal sleeves? They go on the OD of the axle shaft where the ID of the seal seats. Basically making the OD of the axle shaft a little larger to tighten up the fitment between the seal and axle.
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