why would my car stop making as much boost? Mappers Please :)
#1
why would my car stop making as much boost? Mappers Please :)
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
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
#2
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?
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?
#3
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From: ECU Mapping - www.JollyGreenMonster.co.uk
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
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
#4
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?
really strange as it has never done it before.
would a exhaust leak cause it?
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#10
#11
Former Sponsor
iTrader: (4)
Joined: Jan 2001
Posts: 16,548
Likes: 2
From: ECU Mapping - www.JollyGreenMonster.co.uk
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
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
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