Would a high reeding cuse a power drop

Don't think the ecu would back the boost off if it's sensing exessive heat but a engine that's too hot might tighten up the tolerances enough to cause drag/wear to affect performance.

If intake temps are high or its over fuelling you'd loose a bit power .

Is it boiling over or just seems to be running a bit hot ?

If it's not broke .....upgrade it 😊

well is wot i have done and found out 

i had a intermittent power problem that seemed to be linked to how hard you pushed it as it, if you put your foot down for a good 10 min you would start to get a power loss then if you backed of for a few miles and let her cool down she would go back to normal.

now iv just changed the temp sensor and it seems to be better but i have only driven home from work

If it's a recent thing (since its been hot) it might be tmic heat soak , have you got the turbo /downpipe heat shields in place?

if not is your downpipe "wrapped" to keep the heat down in the bay ?

If it's not broke .....upgrade it 😊

wot is  tmic heat soak

and there is no downpipe heat shields in place and it is a 3" down pipe not warped 

but i have got some wrap in the workshop

The early top mount intercoolers are the least efficient in the range and rarely make over 300hp when mapped .

So keeping engine bay temps down helps keep the tmic from soaking the heat into the intake air . Giving colder denser air and more hp [emoji6]

Don't wrap the whole downpipe ,as it will get wet under the car , just the top and vertical bit .

If it's not broke .....upgrade it 😊

ok will do that tomorrow see wot happens thanks once again 

Turbo blanket may help too

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Ok will have to get 1 of them