ScottR400D

I routed the harness over the fuel tank which I think is the best solution but you’ve ruled that out.

Sintered.

The cost of a rebuild varies. If the bearings are OK maybe £4-500. If the whole lot needs renewing, twice that or more. I was charged over £900 for a full rebuild back in 2020. Plus the cost of removing and refitting the diff if you can’t do it yourself. At 9k/5 years I’d be having the diff rebuilt regardless of the preload.

Have you found a source of the same housing that CC use? I believe there are variations on the BMW ‘168’ diff. Other than that the housings appear to be fairly precisely machined for a 7 might not be easy to get accuracy with an angle grinder! And of course you’d need to be sure the CC backplate fitted the housing. I assume you have a 3.9 ratio diff? I have a spare, rebuilt 3.6 with a Titan which I’d sell to you for a lot less than CC will charge but it’s no use if it’s the wrong ratio of course. You could always buy a diff from BMW and strip out the CW and P, I guess.

Yes, you can. Though I doubt that Stuart would take you in the wrong direction if you’re clear in what you want from the car.

You’re right, premature failure seems to be more of an issue with higher power cars, often occurring at 3-4000 miles or so. The noises under ‘normal’ operation though are common across the range. Some find that is acceptable and live with it. Or find that it’s alleviated with an oil with a high level of friction modifiers but that’s just masking the real issue. I tried the RRT oil (and others) but didn’t find it made that big a difference, though some clearly do.

Hear, hear! Some are more pitied than scorned………. 😉

They don’t, in my experience. The reason I changed to a Tracsport, in addition to having no faith in the longevity of the Titan, was the awful grunting, graunching and other horrible noises made by my expensively rebuilt Titan at lower speeds.

Everyone I know with a Tracsport has had the same experience. Start off around 25, perhaps lose a ft.lb. or two in the early days then stay steady. I’ve also done 6k or so but Nigel Brown has done 2 or 3 times that with the same result. The only reason for the Titan to start off so high is to allow for steady and continuous degradation, as far as I can see.

“When the prototype TITAN Mk2 is available maybe I could assist in some back to back testing. Well I do have a Tracsport BMW Diff so what better comparison. Obviously I did not turn down the invite” Any news on that front Geoff?

Anybody know part numbers for the 4 pot front calipers?

Part numbers for which brake calipers?

No point having an adjustable oil cooler blind. There’s no need for a cooler on the road and it’s a few minutes work to remove a fixed blind for track use.

I should think there are several people that could provide a map. At least as good but likely better than CC. "they are the ones who understand this setup of the engine" I doubt that.

#40. Exactly this. And even if it were a significant risk it would be easy to guard against without disconnecting.

#30 just where has a 'legitimate reason been established'?

#20. You'd still need recovery back to the pits if in the gravel to that extent. As for the debris damaging the speedo cable/sensor, "what are the chances of that?" as Harry Hill might say. After 9 years with regular TDs, it's never crossed my mind Anyway, maybe the OP will enlighten us?

#14. Not heard that before and seems extremely unlikely. In fact I can't imagine how that sort of damage could be done on track without the car being in a state which would need recovery in any case.

Seems a pointless exercise and I suspect the OP knows that but for some reason is ignoring it.

I think the outer layers get hotter quicker than the core. The process needs to be very carefully controlled to be successful. It's widely used for all sorts of shafts especially drive shafts.

On further thought I think that's just a dodgy friction weld. Looks like it's only actually welded on the outer circumference rather than across the piece.

To be honest that looks like a friction weld and I wouldn't be surprised if it's not a more widespread process that we might think. I'm not sure why anyone would opt for that method but I very much doubt it's a one off. It might be to achieve different properties in different parts of the shaft. It's certainly used quite a bit with driveshafts. "OEM customers face daily challenges of material pricing vs. product performance, causing pump shaft manufacturing to become more expensive as raw material cost increases occur. To reduce manufacturing costs, many customers have started using friction welding as an efficient option for production cost reduction. Friction welded shafts are produced when multiple parts are pressed together through a precise rotating movement. This high speed movement creates friction that results in elevated temperature levels. The heat enables both parts to achieve a plastic like state that forges the parts together into a permanent connection. The actual friction welded shafts require very unique technology that incorporates state of the art monitoring controls. This process is used on specific applications only. Advantages of Friction Welded shaft manufacturing – Friction welding allows OEMs the ability to use composite pieces rather than one piece shafts – Versatility for customers can select the best materials for an application without concern on raw material or solid bar stock costs. – Up to a 66% cost reduction versus traditional shaft manufacturing".

Yes, open diff. Lucky you!!

I know some folks swear by that oil but I tried it, a couple of Redline grades and Caterham's recommended Motul and didn't see any difference at all in noise, smoothness or running temperature. When I replaced the Titan with the Tracsport I tried it again with the same result though that makes more sense in that SPC recommend 'any decent 80/90 GL5'. I'm fairly reliably informed that the key difference is that the RRT has more friction modifiers than usual to stop the Titan locking too much and wearing out. I stand to be corrected.

Drakman is right. I just looked at the one in my earlier image, which is a:spare, and it's got '3.64 LSD' in white marker pen on the underside.