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Sometimes it will stay at 130 deg for a few minutes, sometimes it will drop in a few seconds.
When it does drop, it does so quickly.

I'm sure that would help if problem was on boost... But it isn't.
It runs absolutely fine on boost, then randomly, sometimes, shoots up while cruising AFTER you have seen some boost.
Sometimes it can be 5-10 minutes AFTER boosting.

What fuel are you using? What is the measured compression ratio? What boost are you running? What is you timing advance at max boost? My feeling is the C/R will be too high for the boost and fuel you are using so the timing is being retarded and that will over heat the block boiling the water. Bob ...

GTS GAV wrote:Wow that's super cool where was the reading taken from the hand commander or....? I hope for the op sake it isn't a cracked block but you never no.

From the DTA Software - we aren't using an old school PFC! YUK!
Using DTA S60 PRO
Reading was taken from probe just pre-throttle body

Gizzmo what intake temps were you seing when you were mapping it? And what sort of cooling are you using chargecooler bootmount etc? Also what was the boost set at? Between 14 and 25 deg at 1.5 bar. It's a boot mount 450x250x100mm chargecooler with massive rad at the front and a powerful water pump...

Yeah, I'm sure you are right.
Just asking if anybody has done this...

Out of interest....
If a block is cracked, could it then be sleeved and be ok again?
Anybody done this?

Just to add some more detail here as I map this car... Temps are absolutely fine when on full boost etc. Runs mid 80deg C water temps. After maybe 20 minutes mapping and while on the run down, the water temperature jumps from 85c to 130c in about 2 seconds!! Then it stays there for several minutes, ...