Overheated!!!😕

[bishaldinho92]

Ok thanks for the HELPFUL advice 

 

[bishaldinho92]

On 11/1/2018 at 1:11 PM, Tidgy said:

The turbo wont be running it's absolute max boost.

Helpful👍

[bishaldinho92]

On 11/1/2018 at 2:53 PM, Mr B said:

Only thing happen as turbo working near it's max is efficiency down thus charge temps higher with low density . If charge temps was ridiculously high you will have det and piston issues pretty fast .

Exactly when your overheat occur, always under heavy throttle and boost, cruising, in traffic ???
You best just being super thorough with hunting leaks, fitting new stat, testing flow and system pressure holding and if can't find fault give it little time until can .

Plug colours/deposits give you good idea on how it running and differing look indicates potential likely cylinder with issue/linked to issue . Will need a trained eye unless severe plug colouration/deposits .

3 things I see most for overheating is airlocks/small leaks and 'new' low quality thermostats and head gaskets, on the 2.5 roughly 8 out of 10 seem conclude as head gaskets .
 

 

It doesn't completely overheat, it gets to what could be called 3 quarters and drops back down, sometimes goes over and drops down,sometimes it's when i drive it hard, then I can drive it hard and it's fine, and it will get hot just cruising , I am seriously gettin fukked off with it ! Had the thermostat replaced and it seems to be slightly better if not the same! It's the first decent expensive car i have owned (always had 500 quid bangers) and it I just want someone to have it and sort it the !Removed! out! The mechanic I use seems to make excuses sayin aslong as it's not hitting the red its ok, and the other garage I use which specialise and tune alot of rally /track cars just say HG straight away! 

[Mr B]

^

To be fair with your symptoms I think I too may struggle conclude with irrefutable evidence it head gasket.

Early stage HG issues on these can be total swine diagnose 100% to a customer .

Thermostats need be oem style as most others do not flow well, doubt this your issue but worth highlighting .

My suspicion would be HG on what you said but if overheating minimal and intermittent it hard prove to a customer in solid diagnostic evidence and becomes more a diagnosis based on known repeat failures and experience (all factory 2.5 HG's will fail it just matter of time ...)

[bishaldinho92]

Thanks will have to start saving some pennies then 

[bishaldinho92]

Hg is gone/goin been told 9 times out of 10 with this engine the problem usually snowballs and after original price of 2000for replacing hgwill cost me 4 onwards such a shame cus love the car

[Mr B]

All depends on leak severity and amount of time been like it and overheat it been subject to and tune/usage of car.

I done a lot of 2.5  head gaskets only and only ever had one back and that was ringland failure 10 months down the road.
Got be done on individual basis as lot of these imprezas get spanked and with poor tuning/mapping all while suffering early HG failure .

Hopefully not too much of a surprise as any standard 2.5 will have HG failure, it inevitable by factory design .

 

 

 

[bishaldinho92]

Had a retest done on the coolant, liquid didnt change colour, brought myself a kit to check for cumbustion leaks, liquid stayed blue, car isnt over heating anymore the obly issue i seem to get is occasionally after hard driving coolant seems to be bein pushed into expansion chamber any ideas mr b?

[Mr B]

Well you could check expansion tank hose closely for splits or blockages and if nothing found you could get a new oem radiator cap .

I still be suspicious of HG if problems still continue, I don't use the chemical liquid tests often on these as not sensitive enough, I use emission gas analyser .