Hi , seems that no one has heard of the 1.5jtze ?
this is something discussed on the UK forums a fair bit , the 2.5 TT has the best 'breathability ' of just about everything, and in real world use the 2500 TT is fasterthan the twin turbo supra with just a little care and attention, ie a decat and a BFI , but the 1.5 is a mix of the top off the 2500 , with the bottom of a 3L , in the UK this conversion costs a lot , but where you know some GOOD mechanics anything is possible,
the most efficient use fo fueling , ie the best bang for the buck is such that a totally stock TT except for a boost controller and guage , with stock ceramic turbos running 1bar , can pull a sub 14 sec quartermile , which is nice
if you then change the stock tubs for hybrids, (steel wheels in the turbo ) you suffer more lag but the boost can be turned up to 1.5 bar apparently ( not got round to it yet on mine , still stock :( )but that efficincy of 'breathing ' added to a three litre engine is more efficicent than the big supras, until you get into st00pid price modifications
the TT Twin tubs run together, the supra twins run in series, which means huge power output , but not necessarily where you need it off the track
but if you stick a TT Head , on a 3L jze , you will love the result, at least thats what i'm told about that particular mod :D . ceramics spool up so fast it's almost lag free, a perfect match to the standard TT auto box
the base TT engine internals are apparently good for 600 horses, and the TT gearbox for 400 without any modifications, if you need more than that , then i'd hate to have to pay for your tyres