joegoi

hi anyboby knows that for the standard boost of the sti 2004 model my from 1.4 drop to 1.0 bar.......
reason is still standard from factory!!!!!!!!
i'm trying to get some information on how to maintain the boost level at 1.4 bar.
if i'm not wrong the MAP sensor will send a voltage to the boost solenoid valve for the release of addition boost standard 1.0bar at voltage of 4.7?????????
should i change the followings:
1/ manual boost valve
2/change the standard exhaust diameter to a larger one
3/change the MAP sensor
to have the boost maintained........
presently i have a piggyback to control the fuel and ignition thru the air mass wire.
Can i use the MAP wire so that i can control the boost level??????? will i get the boost to maintain at 1.4 bar???????

HELP kindly .........

Roojai

bigger turbo needed and then a remap I guess.

joegoi

thanks for that advice and is the only one.........
anybody else???????
am i right to say bolting a bigger turbo will maintain the boost level at 1.4bar,as i heard that i will inturns have a boost at a later RPM maybe 4000...as a smaller one i have, the boost will come in at 3500.......a bigger will also have a greater or higher boost .... will it still drops to 1.0 bar?????????
anybody could it be the actuator arm needed to be shortened??????????

thanks anyway!!!!!!!

john banks

VF35 won't efficiently hold 1.4 bar to the red line as I already pointed out to you. No free lunch, if you want a heavy breathing 1.4 bar at the red line, you'll get later spool up.

If you reduce the MAP voltage so that it reads what it is expecting at your desired boost you can fool it to run the boost you want.

But it is so much more elegant to do it properly and remap the ECU, especially on a high value 2004 car with a relatively expensive engine to replace.