CharlesElliott

The symptoms are those of a rear wheel sensor short. Racers like me remove them to avoid any chance of that issue happening!

There is a small mesh filter on the end of the pump but I'm not sure you would hear it. There is a metal frame as well, maybe that has come off.

Baffle detaching inside the tank, or the filler flap.

Car isn't running. Looks to be about 7v.

I don't know but snubbing or not, this signal is not normal.

Has anyone data logged oil pressure in a Sigma? I'm tapping into the sensor wire but see very strange sinusoidal voltage with a 0.5s period....which I don't think is right.

Reduced

White with black trace is the wire. As well as the one to the tacho itself, there is usually a spare one in the loom as well which is not connected to anything by default.

We have had at least two failures- with serious consequences- of solid rear brake pipe failure in race cars. We mandate flexible hoses now.

The issue is the vibration from the metal plenum killing the sensor. You need to insulate the TPS from the aluminium body with some rubber.

OK, I've had to resort to sniffing the CANbus to see what's there. There are four CAN channels, two of which seem to have data. Coolant temperature and something else (which is pretty static) on 0x288 and rpm on 0x280. No throttle position I can find on this ECU. Will investigate a bit more tomorrow. Charles

Thanks, sounds like it isn’t just me then!

Thinking about it, the honeycomb under the tank on a race car won’t help.

Yes, loosening things off does help a bit but I’d still say the tank is two-three inches further away from the panel than it needs to be (same on my other cars). On the metric chassis there are brackets that hold the tank an inch or so off the rear basket tubes so you definitely can’t get it closer.

I've been told that Caterham disable CAN publishing (perhaps except for RPM) on their ECUs

I've fitted three aero caps to two different cars and always had the problem where the filler neck is not even close to being flush/parallel to the rear panel which means it is hard to fit and distorts the rear panel when you bolt it up. This is the newer aero cap that comes with a new filler neck and no collar. The bolts supplied aren't long enough for a collar, but it seems like it needs one! Has anyone else had the same, or can tell me what I am doing wrong?! This is the one I am talking about.

Yes, have dropped support an email today.

Chris - I will double check high and low, they seemed ok. It doesn’t CAN decode. I agree it seems it should work although the Caterham lock makes it hard to see how the ECU CAN is configured. Ian - yes, it is paid, I have a 15 channel CAN licence. Everything came together from Race Technology.

Thanks for the replies. Yes, using the SBD / MBE cable with USB, I can read everything in Easimap without issue. I have a DL1 Club that should be able to process the raw CAN. I have connected CAN H and CAN L from the DL1 cable to pins 6 and 14 on the OBD connector. The DL1 is configured to decode the CAN in MBE 9A4 format (I assume the Caterham locked MBE 992 uses the same format - if not, this could be an issue!). I've had an oscilloscope on the CAN pins and there definitely is something there that could be CAN :-). But no CAN data received at the DL1. Clearly it could be something I have done wrong or have not done, am just trying to narrow down where the issue might be. The 2018 regs imply that Caterham disable CAN on some ECUs (although this is for VCT cars, mine is a 2012 non-VCT car) It is permitted to have the CAN stream data enabled (if not already present in the latest map) from the ECU to provide data to a VBOX as per 5.10. Enabling of the CAN stream can only be done by Caterham Dartford or an appointed Caterham Motorsport Service Centre, by a re-flash of the ECU (for which the vehicle does not have to be present

Hi I have a Caterham race car with a standard locked Caterham ECU (it's the Supersport 140bhp Sigma 1.6). I can use Easimap and read the full range of parameters, but not write anything. I've recently got a DL1 Club which can read MBE CAN directly but having connected it to CAN high / low via the OBD plug I can't seem to read anything. Of course, I could have connected it wrongly....has anyone logged data via CAN from a Caterham ECU successfully? Charles

You will need to remove the rear boot floor, and that probably means moving the extinguisher as well. You can just remove the pipe into the car and rotate it. In imperial chassis the honeycomb panel is generally just laying on the rails or stuck down. On metric chassis, they are riveted down so you'll need to drain the tank, tilt it up and then drill out the rivets.

Ok, may only be on race cars but I’ve only owned race cars! +2 for thin section to the rear so far.

Have fitted them both ways over the years, waisted / thinner end at the back (which means you can't see it so easily) or at the front (more clearance to chassis rail). Which way are they fitted from the factory, is the thinned section towards the front or rear?

Thanks JV.

Sorry, I thought I had replied. It's the bolt that holds the caliper itself to the carrier, not the bolt that holds the carrier to the ear. Because the bolts are pre-fitted to the caliper, they are not listed in the build guide..... (And yes, I had noticed where it linked to!)