I'm putting together an excel spreadsheet that will show the following characteristics of the different turbos available to the coop 20vT. The list is the one supplied by Johns a while back listed in order of spool-up.
The turbos featured are as follows;
T28 Superspool hybrid
T28 Std turbo
T28 hybrid
T28 GTiR hybrid
GT28 0.64
GT28R 0.64
GT28RS/R hybrid 0.64
GT2860RS 0.64
GT28RS/R hybrid 0.86
GT28/32 hybrid 0.64
GT30/25 hybrid 0.64
GT2860RS 0.86
GT2871R 0.64
GT3071R 0.64
GT2871R 0.86
GT3076R 0.64
GT3071R 0.86
GT3076R 0.86
GT30/35 hybrid 0.86
Where does the new(er) 'Ultraspool' fit in?
Johns also supplied the max power made on each of these turbo (at the time). I 'think' it was irrespective of headwork and so maybe corrupt for purely comparative purposes. Maybe the best way to do it would be to collect data for cars that don't have any headwork first (also only 2.0 engines), then collect those that do and see if what difference they make. I tend to think the bigger turbos would benefit more from headwork, but it may simply be a % increase in power/torque and a fixed reduction in spool-up rpm? Of course the 2.4/2.5 jobs are another factor to be considered.
I intend to add these other 'attributes' along the top of the database:
Max Power rpm
Max Torque
Max Torque rpm
Boost Threshold rpm (spool up rpm)
Boost Trails off rpm
Torque Range
Redline Boost
A new thread would probably be the best place to put this info so could anyone with any of those 'attributes' above please post them up on a new thread along with a 'rough' list of engines mods.
Something like this could answer a lot of recent questions about which turbo to chose.
Cheers
