esc cos overboosting ?
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From: Elgin - Scotland
esc cos overboosting ?
Think my cars over boosting lads, I took out the plugs and they were pretty white, no damage atall to the ceramic centre etc, but they were a bit white, not to bad
is it possible that a leaky pendulum chamber gasket can cause over boost, it cuts out if I totally floor it in 1st or second and ive recorded boost spikes at as much as 1.76 -1.8 bar
at the mo, ive changed the plugs and im using optimax and 2 cans octane boost per tank,
but I think ive got an air leak will this cause it to over boost ?
cheers Glen
is it possible that a leaky pendulum chamber gasket can cause over boost, it cuts out if I totally floor it in 1st or second and ive recorded boost spikes at as much as 1.76 -1.8 bar
at the mo, ive changed the plugs and im using optimax and 2 cans octane boost per tank,
but I think ive got an air leak will this cause it to over boost ?
cheers Glen
#2
just take it easy and get to a good tuner with a rolling road. dont take chances "testing" on the road to try and find your problem. 1.8 bar sound too much for your spec/chip? you shouldnt need octane booster if using optimax and a proper set up....
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From: Elgin - Scotland
Originally Posted by rapidcossie
just take it easy and get to a good tuner with a rolling road. dont take chances "testing" on the road to try and find your problem. 1.8 bar sound too much for your spec/chip? you shouldnt need octane booster if using optimax and a proper set up....
yeh bro im on stage 3 dark greens, t34 with .48
was boosting to 1.55bar before on my last engine thats how im thinking ive got a air leak, and also tell tale sign its fookin quik
#4
my cossie is totally standard and i think mine is overboosting aswell....does your engine completely cut out then start itself again after a few seconds?thats what mine does.
#5
Whats it tick over like m8
normally air leak causes a slightly faster idle,
I have had that before when the plenum gasket gave up,
Its need setting up to be safe
Itake it after the engine refit nothings be done to the actuator or anyting like that?
normally air leak causes a slightly faster idle,
I have had that before when the plenum gasket gave up,
Its need setting up to be safe
Itake it after the engine refit nothings be done to the actuator or anyting like that?
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From: Elgin - Scotland
Originally Posted by Skiman
my cossie is totally standard and i think mine is overboosting aswell....does your engine completely cut out then start itself again after a few seconds?thats what mine does.
nah mate, this is just a hesitation, and normally a big back fire aswell
im not sure what overboost functions the P8 / L8 have built in
hopefully somone more experienced will help out
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From: Elgin - Scotland
Originally Posted by Cosworth4388
Whats it tick over like m8
normally air leak causes a slightly faster idle,
I have had that before when the plenum gasket gave up,
Its need setting up to be safe
Itake it after the engine refit nothings be done to the actuator or anyting like that?
normally air leak causes a slightly faster idle,
I have had that before when the plenum gasket gave up,
Its need setting up to be safe
Itake it after the engine refit nothings be done to the actuator or anyting like that?
I think you have hit the nail on the head mate idles being to high and erratic, im gonna order a PENDULUM GASKET and fit that see if it cures it mate, and yeh its to high, as I say prior to this boost guage was only recording 1.6 bar peak
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From: Northants
Originally Posted by Cosworth4388
In any event 1.7-8 bar is too much on 803s
Glenn, octane booster can affect the 'colour' of the plugs I believe, you certainly shouldn't need two cans of it with Optimax imo.
Is it doing that with a full tank of petrol now then too?
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From: Kent
Hi...if its a spike ie....goes to 1.8bar then drops off at the top...then its FINE.....i ran a 2bar boost spike on my 803 setup which settled back to 1.7bar..but i raised the fuel pressure to hold the 1.7bar......the only time you aint got enuff fuel is if you held the spike to the line in every gear on your car mate.
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From: Elgin - Scotland
Originally Posted by Billabong
Originally Posted by Cosworth4388
In any event 1.7-8 bar is too much on 803s
Glenn, octane booster can affect the 'colour' of the plugs I believe, you certainly shouldn't need two cans of it with Optimax imo.
Is it doing that with a full tank of petrol now then too?
heres a pic of a plug mate, but im pretty sure this is an air leak / gasket gone / damaged
#12
Spray WD40 round the Plenum chamber/gagket and if the revs rise...theirs your problem. a leaky one however WONT cause it to overboost, if anything it will under-boost as boost is escaping, and it could possibly cause it to cut out too yea.
white plugs im sure is a sign of overfuelling, someone will correct me if im wrong tho. get it to a RR, AVA in Glasgow are your best bet mate.
white plugs im sure is a sign of overfuelling, someone will correct me if im wrong tho. get it to a RR, AVA in Glasgow are your best bet mate.
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From: Macclesfield - you'll never leave....!
the L8 doesnt have any overboost strategy (i dont think) whereas the P8 allows upto 5 seconds IIRC.
could just be the wastegate actuator needs setting, set the boost to 1.5 bar.
could just be the wastegate actuator needs setting, set the boost to 1.5 bar.
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From: Elgin - Scotland
Originally Posted by Ima-Racing500
Hi...if its a spike ie....goes to 1.8bar then drops off at the top...then its FINE.....i ran a 2bar boost spike on my 803 setup which settled back to 1.7bar..but i raised the fuel pressure to hold the 1.7bar......the only time you aint got enuff fuel is if you held the spike to the line in every gear on your car mate.
ah cool mate, thats a relief, it drops back fine yes on full chat its only boosting 1.5 ish, but ive still got s feeling the gaskets gone, re the chaps comments on the idle as it is not idling well, to high
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From: Elgin - Scotland
Originally Posted by Ima-Racing500
The plug should be a greyish colour to light brown for perfect...That looks ok to me assuming it has a greyish colour to it.
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From: Elgin - Scotland
Originally Posted by Dave Henshall
the L8 doesnt have any overboost strategy (i dont think) whereas the P8 allows upto 5 seconds IIRC.
could just be the wastegate actuator needs setting, set the boost to 1.5 bar.
could just be the wastegate actuator needs setting, set the boost to 1.5 bar.
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From: Elgin - Scotland
yeh lads LOL i know that what im wanting to know is will a leaky plenum chamber gasket cause it to run a little lean, and is that whats causing the high idle aswell
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From: Macclesfield - you'll never leave....!
Originally Posted by Ima-Racing500
Dave......chips are normally open ended..ie the more boost the more fuel....until there is no fuel left then just air ..thats what chips i always had.
#26
Plenum gasket is a weak spot m8
i got a cometic one on mine is i blew a piece out of the bottom of the standard ford gasket,Glenn 5 on here lives near me and he had the same thing happen thursday night after the Local RS meet.
Take the plenum off have a look
It will most likely be that or the inlet (inlet is less likely)
Oh you overboost should be fine i was talking more about a held 1.5bar on greens as a safe limit
i got a cometic one on mine is i blew a piece out of the bottom of the standard ford gasket,Glenn 5 on here lives near me and he had the same thing happen thursday night after the Local RS meet.
Take the plenum off have a look
It will most likely be that or the inlet (inlet is less likely)
Oh you overboost should be fine i was talking more about a held 1.5bar on greens as a safe limit
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From: Elgin - Scotland
Originally Posted by Cosworth4388
Plenum gasket is a weak spot m8
i got a cometic one on mine is i blew a piece out of the bottom of the standard ford gasket,Glenn 5 on here lives near me and he had the same thing happen thursday night after the Local RS meet.
Take the plenum off have a look
It will most likely be that or the inlet (inlet is less likely)
Oh you overboost should be fine i was talking more about a held 1.5bar on greens as a safe limit
i got a cometic one on mine is i blew a piece out of the bottom of the standard ford gasket,Glenn 5 on here lives near me and he had the same thing happen thursday night after the Local RS meet.
Take the plenum off have a look
It will most likely be that or the inlet (inlet is less likely)
Oh you overboost should be fine i was talking more about a held 1.5bar on greens as a safe limit
thanks
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