hi all, have just bought a boost gauge for my99 preza. having taken it out for a bit of a spin found that it boosts to 12psi in 5th. is this normal?? also have invested in a bleed valve when i put this on what can the boost be wound upto? i have just got the standard ecu. thanks for reading this and i would like to hear what you all think. thanks simon
greasemonkey
16 June 2004 07:56 PM
Originally Posted by preza si
hi all, have just bought a boost gauge for my99 preza.
Did you mean an Impreza?
having taken it out for a bit of a spin found that it boosts to 12psi in 5th. is this normal??
Boost target is 0.9 bar, which equals just over 13psi, so either you weren't loading the car up quite enough when you took this measure (try accelerating hard up a slight hill in fourth), or your boost gauge isn't quite as accurate as it could be.
also have invested in a bleed valve when i put this on what can the boost be wound upto?
Depends entirely on what fuel you are running, how healthy the sensors on your engine are, whether there are any other modifications present, what petrol you use, and indeed how accurate your boost gauge is.
The only way to know what boost pressure is safe is to monitor detonation, and ideally air:fuel ratio. You can do the former with a KnockLink and the latter with an AFR meter.
i have just got the standard ecu.
Which one would that be? MY99 UK Turbos came with three different ECU's, so you can see why it's not possible for anyone to simply tell you that your engine is safe up to such and such a boost pressure. All these engines are slightly different and the only person able to find out how far your engine will safely go is you.
SiDHEaD
16 June 2004 07:58 PM
We tried his boost guage on mine and it was to 13.5ish in 5th (i have 1/2 decat tho). Try again once you have your afterburner on Si :D
preza si
17 June 2004 07:55 PM
no i did mean preza :). thanks for the reply. does any1 else have any views other than sid!!
SiDHEaD
17 June 2004 07:59 PM
gm: how can you find the ECU model?
greasemonkey
17 June 2004 08:18 PM
Plug it into a Select Monitor or DeltaDash, or, if you don't have access to those, just lift the passenger footwell carpet and the ECU cover, and look at the label. Will be either AE800, AE801 or AE802.
Just having a gentle drive, checking it like :) Didn't fancy hanging about at the junction by the boy racers incase i got ploughed into or something! Funny place for them to hold a "cruise"!
scooby95wrx
18 June 2004 12:26 AM
shame i was not out in the scoob :( could of teached them a few tricks :D :D on how to drive :eek: :eek:
AvalancheS8
18 June 2004 08:18 AM
Originally Posted by scooby95wrx
teached them a few tricks :D :D on how to drive
If not on grammar.....
:D
preza si
18 June 2004 07:45 PM
out of the 3 ecu's that u listed which is the best 1?
greasemonkey
18 June 2004 08:25 PM
AE800 and 801 are about the same power wise. AE802 develops slightly less power, feels smoother (i.e. car comes on boost a little more gradually), has more active knock detection and a reputation for hesitant throttle response.
