The standard thermostat in the FG turbo has a 54mm flange a total height of 39mm and a flange to base height of 22mm, it is a 91C/195F temperature

For those wishing alternatives just to make it easier I have Dayco part numbers that can be cross referenced for other temperature configurations.

Std DT14B (91C/195F)

step 1 DT14G (89C/192F)

Step 2 DT14A (82C/180F)

Step 3 DT14E (77C/170F)

Step 4 DT14C (71C/160F)

All these thermostats are identical except for temp ratings. These are listings and I take no responsibility for any consequences of running anything other than std equipment and you should consult a professional prior to fitment.

Just for an idea of differences, the temp guage on the FG ran just nudging half way on the std thermostat and I went for the coldest one (71C) and it now runs just a hair over one quarter on the guage. A run out west today had it returning almost 1km/100L better than the last trip (same route) but will need to repeat the run a couple of times may be just coincidence. Only had the car 1 week and done 1500km already hope the novelty wears off before the car wears out.

Thanks for that mate. The info was more help that the local auto shop could give me.

Interesting. There must be a reason why the engineers at Ford would run the engine at 91deg though.

Benny.

Probably just to suit their tune. I think most cars run at around 90°. I'm sure everything they do has got a reason but most of them aren't for guys like us that modify them.

I use an 87 Deg one. Cant remember brand etc. Temp floats from 86-88 and up to 92 on highly congested areas or under a lot of spirited driving. Fans kick in at 90 on the current tune.