Exhaust Gas Temp

Just today my exhaust gas temp has risen to 875C on full boost and sits at a higher level off boostand set of the warning on the defi gauge when WOT, not noticed this before what could be the problem ??

A number of things really. Possibly your intercooler has degraded over time (I think you might notice the temp creep) or maybe you've sucked up a poly bag into your SMIC. Baffling inside your exhaust coming loose backing up the exhaust gas???? Turbo's overboosting and creating excessive heat. I'm not sure about fueling effects on EGT. Thats as far as my limited tech ideas stretch no doubt someone will happen along and tell me I am talking crap.

Checked the intercooler but as it is front mounted it is clear, the pipes all look fine and tight, the exhaust sounds ok no loose baffles, worried though as this has happened overnight, anyone else before I call turbofit ??

New batch of fuel with lower octane???

As the supe uses knock sensors it may be that a new tank full of fuel that's a lower octane is causing it to back off the ignition a touch. Retarding the ignition causes exhaust temps to rise.

If its learnt a more retarded WOT advance map try resetting the ECU?? Refuel with a decent fuel (V Power) at the same time??

where is the probe situated

where is the probe situated

ashamed to say i have no idea where to look for the probe, filled up with super unleaded as always

There is approx a 200deg difference in having the probe mounted before or after the turbos.

If your probe is after your turbos you could be looking at real EGTs in excess of 1000deg which is deff not good.

If this is the case you should get it on a dyno to diagnose whats wrong with it.

I assume that's 200 deg F not 200 deg C. If it's F that is 90 C which although not over 1000 C, it's damn close

Nope Deg C not F

Oh, that is high then

I'd guess the probe is in the manifold before the turbo's and not in the cat/downpipe as it would already have melted if the cat temp was 875. It might just be a faulty sensor.

going to get it in to check, dont want to risk it

You haven't fitted anything new recently have you? Exhaust cam timing plays a part in EGTs.... Do you have adjustable pullies? Is the belt tight? Beware, Super Unleaded is not sufficient for your car.... Most are 97 grade (Total, Texaco, Esso BP PANTS!!hehe). V-power and Tesco 99 is a minimum.

Try dropping some octane booster in and see what happens.

Do you have a wideband gauge in the car??? If not would advise one then you can see if your running lean as that also causes high EGTs. AEM do a great 52mm gauge with everything you need

fitted oil catch tank and thats all, will have to fill up with v power and see if that helps