dj219957

i have just fitted a boost gauge.
is it normal for a 93 wrx to acheive less boost in 1st and 2nd and 3rd than in 4th and 5th.
i have scoobyecu fitted and im getting 16psi in 4th and 5th but i only get 10psi in 1st, and about 14 psi in 2nd and 3rd. is this normal?
Is there anything i can do to get a consistant level of boost in all gears?

andy

dorrans1986

Hi my Subaru impreza 1995 import does the same not yet got to the bottom of it plus also just started misfiring too

TonyBurns

iTrader: (3)

Yes its normal

Tony

P1#1015

iTrader: (14)

Normal

jonboy0373

my 94 ra holds .8 bar in all gears

ALi-B

iTrader: (1)

My My97 held 0.9bar from 2900rpm to 5000rpm regardless of gear with a maximum peak of 1.1bar on initial spool up (on a cold day ).

With exception of the usual 0.5 bar boost if you hold 2nd gear at 2000-3000rpm for too long (i.e when following a learner driver and waiting to overtake).

Alan Jeffery

Yes and no.
There are methods of in gear boost compensation, but it can only control boost if it's possible to have it. In first gear, the low gearing tends to run the revs through the range faster than the turbo can refill what's coming out, if you see what I mean. Bear in mind that a turbo is an exhaust gas driven pump. It just takes a little while to fill the pipework and intake system, lag if you like. In second gear, you spend a little longer pushing, then more again in third etc. If you have a very efficient turbo combination, then you end up in a situation where the turbo can actually produce more boost than you need, in which case you can control it with wastegate controllers. If you don't have as much boost as you'd like, you can't control something you don't have enough of, and you have to put up with what you get.
It's the classic dilemma. Of course, being greedy we want it at both ends.
You can, but you have to work at it. Bigger engine is one way. Variable vane turbos is another way. Most people have to accept that there is a finite limit to what can be obtained from a relatively inexpensive combination, based on a 2 litre engine.

morandpeter

iTrader: (5)

i have a pp chip and it runs 1.1bar all day long in every gear hee hee..............not much use just now though with a HG fail.lol