I have a HPI magazine where Martin Donnon measured the temps of his Soarer before and after a few runs somewhere - I'll try to dig it up. Essentially a better intercooler made a big difference on inlet temps.
The GZ20 intercooler is pissweak on a 1g - I imagine it'd be hopeless with the 1jz. Get that hybrid cooler on there ASAP!
And for the Adelaideans - thank god for the return to cooler weather! Car feels 10 times quicker when it's 20 degrees and not 40 degrees!!