oVERBoost or Fuelcut ?? Help
30 January 2005, 11:42 AM
#1
oVERBoost or Fuelcut ?? Help
Since doing the air box mod ( removing the resonator ) The car is hitting fuel cut or overboost due to what ??
at around 3500 - 4000rpm its peeking 1.18 on the blitz boost controller
Before doing this mod you could easily peak 1.25 - 1.30 without any probs.
Is this due to the ecu and why now ??
Lambda is showing a little rich low down and knocklink activity has gone up to a first green...
Fuel preesure when hot is 3.2 at atmos and 2.6 with vacumn..
Any ideas guys at what sort of set up i should be looking at ???? or whats the cause ??
at around 3500 - 4000rpm its peeking 1.18 on the blitz boost controller
Before doing this mod you could easily peak 1.25 - 1.30 without any probs.
Is this due to the ecu and why now ??
Lambda is showing a little rich low down and knocklink activity has gone up to a first green...
Fuel preesure when hot is 3.2 at atmos and 2.6 with vacumn..
Any ideas guys at what sort of set up i should be looking at ???? or whats the cause ??
30 January 2005, 02:00 PM
#2
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Originally Posted by morpheous
Since doing the air box mod ( removing the resonator ) The car is hitting fuel cut or overboost due to what ??
at around 3500 - 4000rpm its peeking 1.18 on the blitz boost controller
Before doing this mod you could easily peak 1.25 - 1.30 without any probs.
Is this due to the ecu and why now ??
Lambda is showing a little rich low down and knocklink activity has gone up to a first green...
Fuel preesure when hot is 3.2 at atmos and 2.6 with vacumn..
Any ideas guys at what sort of set up i should be looking at ???? or whats the cause ??
at around 3500 - 4000rpm its peeking 1.18 on the blitz boost controller
Before doing this mod you could easily peak 1.25 - 1.30 without any probs.
Is this due to the ecu and why now ??
Lambda is showing a little rich low down and knocklink activity has gone up to a first green...
Fuel preesure when hot is 3.2 at atmos and 2.6 with vacumn..
Any ideas guys at what sort of set up i should be looking at ???? or whats the cause ??
30 January 2005, 06:12 PM
#3
Hi Mark
Just got back from a test drive lol
Tried adjusting blitz controller in 4th and 5th but still hits around 1.15 - 1.19 bar as recorded on the controller as peak hold......Then.....The car just cuts and you let off the gas then ok
This didnt happen before i fitted
A. Walbro pump and fse reg
B. Removed the air box resonator and piped the air box behind the indicator
I was getting up to and above 1.2bar boost before no probs and tried it at 2.8 still no probs (just sweat)
Just got back from a test drive lol
Tried adjusting blitz controller in 4th and 5th but still hits around 1.15 - 1.19 bar as recorded on the controller as peak hold......Then.....The car just cuts and you let off the gas then ok
This didnt happen before i fitted
A. Walbro pump and fse reg
B. Removed the air box resonator and piped the air box behind the indicator
I was getting up to and above 1.2bar boost before no probs and tried it at 2.8 still no probs (just sweat)
Originally Posted by whitescooby 330
hello chris in what gear have you set your max boost in
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31 January 2005, 12:25 AM
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I was just curious, i have the exact same problem as you and all i did was discon the battery for 5 minutes today, have'nt had a chance to look into it yet. I'm using a blitz controller too and it seemed very coincidental as i run 1.4 full time, well at least i did, now i've got fuel cut at precisely 1.18, i checked all my settings thinking maybe the blitz did'nt keep its memory but its all as it was. So for now ???
31 January 2005, 12:31 AM
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Just thinking out loud here but, if the ecu senses excessive det does it cut the fuel....just when you said you got another green on ur KL.... erm no... it retards the ign timing .... must be bed time, losin the plot.
31 January 2005, 08:52 AM
#10
Advice
Strange one m8 ????
This has all come from doing the airbox mod and feeding it with a cold air pipe from the front and or a fuel pump and reg..
Is it due to the fact that its making more power due to the extra air wasnt or would it be due to the fuel ???
It hits (fuel cut) ? everytime now and you carnt really boost over 1.15bar
So whats caused this and how do i get round it
The knocklink at the most is showing a bright green and no more
Any advice appreciated
This has all come from doing the airbox mod and feeding it with a cold air pipe from the front and or a fuel pump and reg..
Is it due to the fact that its making more power due to the extra air wasnt or would it be due to the fuel ???
It hits (fuel cut) ? everytime now and you carnt really boost over 1.15bar
So whats caused this and how do i get round it
The knocklink at the most is showing a bright green and no more
Any advice appreciated
Originally Posted by nice guy
I was just curious, i have the exact same problem as you and all i did was discon the battery for 5 minutes today, have'nt had a chance to look into it yet. I'm using a blitz controller too and it seemed very coincidental as i run 1.4 full time, well at least i did, now i've got fuel cut at precisely 1.18, i checked all my settings thinking maybe the blitz did'nt keep its memory but its all as it was. So for now ???
31 January 2005, 09:12 AM
#11
Have you tested your Knock Link to make sure you can get reds? there was a problem with the soldering on some of them causing oranges and reds to become open circuit. You may well be getting lots of det and not know it.
31 January 2005, 09:25 AM
#12
Cheers Bruce but its fine,i wired the leds on a fly lead but i do check it,theres a post by nice guy with the same prob as stated mine comes from either the airbox mod or fuel pump and reg it was fine before these ?????
Originally Posted by bruce
Have you tested your Knock Link to make sure you can get reds? there was a problem with the soldering on some of them causing oranges and reds to become open circuit. You may well be getting lots of det and not know it.
31 January 2005, 09:30 PM
#15
Cheers for the thoughts Bruce I was beginning to think thers only myself on here LOL ....
Did think this myself but according to the lambda link its running rich all the way through,I have a feeling its the maf seeing more air and signalling the ecu to shut of the fuel??
But why could i run more boost with no fuel cut before,surely the increase in air = more power ??
Maybe total bo@@ox but any ideas welcome.
Did think this myself but according to the lambda link its running rich all the way through,I have a feeling its the maf seeing more air and signalling the ecu to shut of the fuel??
But why could i run more boost with no fuel cut before,surely the increase in air = more power ??
Maybe total bo@@ox but any ideas welcome.
Originally Posted by bruce
Just a thought but could you try upping the fuel pressure, just to see if the extra air from the cold feed is causing leaness on boost?
31 January 2005, 09:41 PM
#16
Well I think I would replace the resonator to see if the problems are cancelled. I've carried out mods before and got problems afterwards, only to find something else is not happy. So the problem could lie elsewhere, but the recent changes are misguiding you.
31 January 2005, 10:17 PM
#18
All sounds about right to me but im seeing rich fuel all the way through the rev range and the only knock activity is 1 green illuminated ?
Apexi pfc is next on the list but need the turbo first so for now maybe best putting resonator back on and boost upto 1.20bar with no fuel cut
Still baffles me as to why it should fuel cut without the res\box at 1.18bar ??
Is there anything else that can be checked or done ? Maybe fcd ?
Cheers Guys
Apexi pfc is next on the list but need the turbo first so for now maybe best putting resonator back on and boost upto 1.20bar with no fuel cut
Still baffles me as to why it should fuel cut without the res\box at 1.18bar ??
Is there anything else that can be checked or done ? Maybe fcd ?
Cheers Guys
01 February 2005, 01:20 AM
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Yeah, i,ve just fit FCD tonight, it's letting me boost at 1.4 again no probs, but i still dunno why it started cutting at factory preset after changing my battery? Yet! I've been running at 1.4 bar since i got the car, Hmmmm frustrating.
01 February 2005, 01:25 AM
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Can a mapped ecu lose its map when you discon the batt, ya know like a radio loses its preset stations, is that possible ?
Never had much to do with mapping, so if this sounds stupid, call me stupid!
Never had much to do with mapping, so if this sounds stupid, call me stupid!
01 February 2005, 04:16 PM
#22
Ok after a day of messing swopping and changing things(and 20 quid of optimax)lol...I came up with these assumptions They maybe wrong but with the lack of inspiration from snetters then its a case of DIY 
1.Resonator fitted and k+n panel filter and fuel reg set at 2.6vac on 3.0bar vac off..You could boost around 1.2 upto 1.3bar
with no fuel cut ?
Running at 1.2 boost for a mile and holding no probs.knocklink activity zero unless you held it at the top but maybe more mechanical noise than Det...Lambda was reading rich all the way through and richer at idle than on standard pump and reg..
2."MOD"Airbox Resonator removed and 3" hose piped directly into airbox from behind the front indicator area inner wing k+n panel filter same fuel pressure...
Around 3500-4000 first green light flickers on the knocklink boosts up to 1.18bar 4th gear wot and it cuts take ya foot off and away we go again.Lambda shows rich fuelling and no more than a constant green knocklink activity anywhere in the rev range..
Air through maf is more dense and turbulant obviously cold
Have read different views on this on various forums and unless you can get a map done with supporting mods to cope with the extra air which is now at the maf then you may not be able to run such boosts ? and should monitor your fuel and det..
Maybe like the APS intake which many people have said needs a map to run safely..
With the summer approaching i would have thought its got to be beneficial for the colder air feed And surely boost up to or around 1.10 - 1.15 bar is almost tops for the td04 to run at safely and you wont notice the 0.05 anyway ? and you still have fuel cut from the ecu left in reserve (just in case)
As nice guy has done you could fit FCD ?
Which way would you go ?
Resonator and run 1.2bar ?
No res at 1.15bar and cold air ?
Thats about it for now thanks to the guys who threw there pennith in and anyone else reading it i hope it helps.
If i'm barking up the wrong tree pls advise ??
Looks like seeing the guru mapper
1.Resonator fitted and k+n panel filter and fuel reg set at 2.6vac on 3.0bar vac off..You could boost around 1.2 upto 1.3bar
with no fuel cut ?Running at 1.2 boost for a mile and holding no probs.knocklink activity zero unless you held it at the top but maybe more mechanical noise than Det...Lambda was reading rich all the way through and richer at idle than on standard pump and reg..
2."MOD"Airbox Resonator removed and 3" hose piped directly into airbox from behind the front indicator area inner wing k+n panel filter same fuel pressure...
Around 3500-4000 first green light flickers on the knocklink boosts up to 1.18bar 4th gear wot and it cuts take ya foot off and away we go again.Lambda shows rich fuelling and no more than a constant green knocklink activity anywhere in the rev range..
Air through maf is more dense and turbulant obviously cold
Have read different views on this on various forums and unless you can get a map done with supporting mods to cope with the extra air which is now at the maf then you may not be able to run such boosts ? and should monitor your fuel and det..
Maybe like the APS intake which many people have said needs a map to run safely..
With the summer approaching i would have thought its got to be beneficial for the colder air feed And surely boost up to or around 1.10 - 1.15 bar is almost tops for the td04 to run at safely and you wont notice the 0.05 anyway ? and you still have fuel cut from the ecu left in reserve (just in case)
As nice guy has done you could fit FCD ?
Which way would you go ?
Resonator and run 1.2bar ?
No res at 1.15bar and cold air ?
Thats about it for now thanks to the guys who threw there pennith in and anyone else reading it i hope it helps.
If i'm barking up the wrong tree pls advise ??
Looks like seeing the guru mapper
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