Bpu boost

Lads any idea what sort boost bpu on stock ecu should be making 1st 2nd 3rd gear is 13/14 psi. 0.9/1bar is this about right or should it make more evc set to 18psi max.4th 5th gear it reaches 16/17. Is there way turning up boost in lower gears or is this were the fcon or standalone comes into play.

Are you on jspec or uk spec twin turbo's?

Going by the factory manual, a stock supra is going to making between 0.6-0.75 bar (8.8-10.8 psi) of boost. If you have the right supporting BPU mods, then you can go up to the generally accepted safe limits of 1.2 bar (17psi) on jspec turbos & 1.4 bar on UK turbos (20psi). You can go higher obviously, but longevity of turbo may be affected.

Generally speaking you will make less boost in a lower gear versus a higher gear. In a nutshell, the more load the engine experiences the higher the boost it can create, versus a lower load situation. If you're boost controller has a gear detection mode, then you could force the duty cycle higher in lower gears to try and get more boost. But the lower boost is more a mechanical symptom which may not be able to be remedied unless you change something mechanically.

UK mate

Update on this when I reset the evc and select the swing valve option 15psi is the max the turbos will boost 4th and 5th gear, However when I select the poppett valve option car boosts to 17psi in 3rd and 4th 5th 19psi. Afr on full boost in the 10/11 reading.

2 weeks.