Very true. When I toured the factory a few years ago I was amazed how clean/sterile the production line was. I’m not sure there was a spec of dirt anywhere.^ um what? Sloppy production line? Have you seen the production line? It’s cleaner than my doctors office.
I have yes, I have been to MTC. I am british, I know people there, I know what goes on. What I meant was, as someone mentioned above, the tanks are subcontracted, at least wipe them down before installing. This is sloppy.^ um what? Sloppy production line? Have you seen the production line? It’s cleaner than my doctors office.
Finally someone knows what he is talking aboutSome of the comments here have relevance and some of them do not. Revving the engine while cold is not going to cause that kind of damage. You can't even rev it past 4500 when it's cold, so hard revs would not even be possible on McLarens in cold conditions. And catless mid-pipes, tune or no tune, cannot do that kind of damage either. All it does is just reduce some back pressure, not enough to cause detonation or overspin the turbos, that's all still controlled by the electronic wastegates and the three boost pressure sensors. The secondary o2's are only for monitoring emissions, they do not affect AFR info, just CAFE standards. So turned on or off it would only be the difference of having a CEL or not.
I would suspect in this case the more common issue with McLarens, which is oil consumption, was the problem. The oil level likely got too low and it started to eat the bearings. This could have started with the previous owner(s). You have to check your oil every thousand miles when owning a Mac, or you can be down a couple quarts and not even know it. This has been the case with all three of my Macs. But that does not explain the shavings in the fuel tank. Another possibility is the shavings clogged an injector and it ran lean then detonated a cylinder.
Correct but unlikely. No way would make it through.yes, there is a filter sock and a "real fuel filter" as well. if a metal chip makes it to the injectors it must be houdini!
but it is possible for junk to accumulate over time in fuel system then possibly disrupt flow to injector.
100% I put downpioes on while I was waiting to do my first tune . Second I floored the car it cut out like hitting a brick wall cause of overboost .You cannot run downpipes without a tune on this car. You will get 0.4 - 0.5bar bar of over boost and the throttle will cut when the fuel trims can no longer be corrected. 0.5 bar is a serious amount of overboost!
If anyone wants to see a datalog of stock software with downpipes please see below;
Please don't run downpipes without a tune on this car
When you remove the cat the turbo can spin faster than the ecu was set for and creates more boost or a boost spike mostly and the cuts the engine for safety. It feels straight up like hitting a brick wall and throws check engine code for over boost .Interesting. I dont see how this can happen as it is ecu controlled (boost)
Yes this has always been an issue on turbo cars when removing the cats. My old Mitsubishi Evo back in 2005 did this and have seen tons of friends cars do it since then. It’s commonly referred to as fuel cut. As stated above it feels like you hit something. Scares the shit out of you but saves the engine from popping due to going extremely lean. You have extra boost without the extra fuel.When you remove the cat the turbo can spin faster than the ecu was set for and creates more boost or a boost spike mostly and the cuts the engine for safety. It feels straight up like hitting a brick wall and throws check engine code for over boost .