Ian

iTrader: (10)

my car normally runs around 1.5 bar on full boost (sometimes a little over/under)

readings from defi boost, apexi commander, apexi avcr

went for a drive today, and after a hardish launch, it only made 1.35 bar

drove a few more times and it strugled to get to 1.4 bar most of the time at 1.39

i know its not the air temp

what else could i check.

the only thing i have changed is the centre section and back box of my exhaust.

from a blitz nur spec system to a unknowen brand 3" titanium one.

but it was running the normal 1.5 bar of boost with the new exhaust on.

what could it be, or i can check?


took these readings off the commander

boost 1.39
knock 11
injection D 92.0 %
reves 7068
ing T 49 deg
air flow 4645

if it helps


thanks
ian

Ian

iTrader: (10)

ok just been out again, and all seams fine i think

these were taken off the commander

boost 1.53
knock 18 (abit high, only went this high on this set of readings)
I D 98.2%
rev 7522
I T 49
Air flow 4710

this seams normal now, i did put some more v-power in.

any ideas?

Jolly Green Monster

iTrader: (4)

you mention launch so I presume the first time out you were looking at lower gear readings and gunning up through the gears..

ie. full throttle in 1st to redline, then change to 2nd and take to high rpm then third etc.. you won't build as much boost doing this as if you say are at 3000rpm in 3rd and floor it.. due to the load on the engine in 1st being lower and then the rpm being higher and the turbo strugglnig to produce the air /boost quick enough etc..

or something else if the tests were identical?

Simon

Ian

iTrader: (10)

hi simon,i that is when i first noticed it, but when i took these readings there were in (both same gear) but can not remember if it was 2nd or 3rd, from low reves start

really strange as it has never done it before.

would a exhaust leak cause it?

Welloilbeefhooked

iTrader: (3)

Injection duty 98%? Surely thats bad.

Ian

iTrader: (10)

they are 550 with 3.5 bar fpr

banny sti

iTrader: (68)

What are you idle vacuum readings once up to temp?

Banny

Ian

iTrader: (10)

anything from -420 to -480

they normaly are the -420 to -440

but when it was not making boost the other day, it was the -480

Jolly Green Monster

iTrader: (4)

no, he is just maxing his injectors at high rpm..

Welloilbeefhooked

iTrader: (3)

So its ok to have them that high for short durations? No danger of sticking?

Curious thats all.

Wayne.

Jolly Green Monster

iTrader: (4)

no real danger of sticking.. the only danger is when the injectors exceed 100% ie. the recorded value is a peak of 100% but the engine wants more fuel..

Never seen a problem running up to high 90s at redline etc.. as there is therefore enough fuel supply to cover the needed fuel.

Simon