2 Things, Radiator temp + Boost issues

[Adydas]

Right.. Im so lost things dont add up and i dont understand why.

Firstly the Radiator temp at speeds ( ie motorway ) the temp guage reads right down to C and off highway it raises to the center between H and C.

Should it really drop 1/4 + on the guage due to getting 100kph winds cooling the radiator? or is somthing iffy going on? Is this a stock normal thing to happen as i was allways under the impression all cars ran in the middle? even at speeds

2ndly is regarding the boost.. tuned it with an Apexi AVCR to 1 bar @ 59% Duty Cycle. After about 2 days it was creeping hard out and boost cutting.. So ive alterd it down up left and right and it cant get a steady setting. is it possible with an old turbo and W/G it could be going naff and these are warning signs.. OR is it something else??

also if i tune it to about .9 bar it spikes to that for a smidge but then bleeds off quite fast. The reason i ask is Both the ST165 and ST185 have done this all after about a week of running fine and dandy at high boost.

[Malcolm]

sounds like the thermostat is leaking.

as for the boost...well it seems a bit strange, ct26's aren't exactly known for crazy overboost unless there's something wrong with the actuator or the boost control solenoid or something

[Adydas]

how do i test its leaking or not? its only started doing it Since i had the radiator Cleaned and flushed out..

well the solenoid was fine.. but now its all playing up. it seems ok today after a blat out South side but im allways holding back nailing it for fear of that sudden CUNK wack of the boost cut.

[Ae92typeX]

to test the thermostat properly you usually take it out and dip it in boiling water- you will see it open. However, once you have got that far it really makes sense to just replace it- cheap as chips and better to start off fresh imo.
A mate had a similar turbo issue with his batty, ended up being a boost sensor I believe. May not be applicable in your case however, not sure.

[Adydas]

well it does have a seperate Boost sensor as part of the kit so if thats naffing around its possoble that could be causeing some issues.. but even so that dont explain things.