thermostat opening temps...lower temp' stats?

[cwspellowe]

mine sits around 79/80.

but get moving...ie boosting for a bit...it rushes towards 90...then gets worryingly close to 100. fans come in as should and does go down but I would like to slow the rush to hot a bit!

Are you monitoring your EGT's and EMP's? You've a lot of fuel and air going in, you sure you aren't cooking it?

My 10mm + '56 with a very restrictive exhaust mid section hits 7-800deg after a few hard pulls and the temps stay bang on 80deg the whole time. I've had rapid heating issues before when boosting though:

1. When the HG was on the way out, on the T2 and 9mm, 28psi, one or two pulls on the motorway would see temps jump up to 90+deg then back down again

2. Before i fitted the heater matrix hoses and gave it a properly thorough bleed, car would warm up, hit 90, back down to 75, then stable at about 80 until i hit boost a few times when they'd slowly rise to 90 and then back down again.

Forgive my ignorance but is the 2.1 an ally head too? As i'd be majorly worried if i was hitting 100deg regularly when on boost with the 1.9.