EP91 Dropping Boost

keirGERS

Fresh Recruit
Just bought myself a 1996 EP91, first boosted car and first toyota. Had a few hondas before hand. Its basically standard performance wise bar a genuine HKS BOV, and Ive done the first and second gear limiter bypass. However it seems to be dropping boost at high revs, 4000 ish and it'l be boosting at 9 - 10psi however higher up the revs (6 - 7000ish) itl half and keep dropping.

Has anybody got any ideas what would cause it to do this?

Also there appears to be a very slight oil leak from somewhere on the firewall side of the engine, I don't know if this could be related or anything?
 

pilgrim_fgau

Member +
Standard actuator becomes weak due to its age, get yourself a hks actuator, it will hold boost much better, and will alow you to increase boost once you have the rest of the supporting mods, if thats the way you want to go
 
Top