russ78 Posted May 9, 2012 Share Posted May 9, 2012 i am running my glanza at 1 bar i have a rrfpr set at 3.1bar and a hks fcd set at 9 but not decatted as yet (but i do have one), i know im gonna get get people saying get it rolling roaded and that, which i am in the process of doing but i wanna get my last few mods before hand.anyway back to the problem at hand i had been hitting fuel cut and it was bringing up the the engine management light so i changed the fcd as i suspected a faulty fcd but now with new fcd fitted im getting no engine management light but still the ocassional jolt hinting its still hitting fuel cut.my question is my fuel pressure to low or is something else at fault i.e no decat ??just dont wanna pay for a rr and waste the session if you get what i meanany help would be great thanks Quote Link to post Share on other sites
akyakapotter Posted May 9, 2012 Share Posted May 9, 2012 (edited) id say its the FCD mate as i have a jam FCC and rrfpr set to 3.1 for a bar and its fine on mine. Edited May 9, 2012 by akyakapotter Quote Link to post Share on other sites
funny onion Posted May 9, 2012 Share Posted May 9, 2012 mine did this, was fuel pressure. i bought a wideband and put that on to set up my fpr properly and it's been fine since Quote Link to post Share on other sites
russ78 Posted May 9, 2012 Author Share Posted May 9, 2012 thats what i thought also a wideband and set afr myself as my local tuners dont wanna know unless im running a management system so was your fuel to low or high ? Quote Link to post Share on other sites
funny onion Posted May 9, 2012 Share Posted May 9, 2012 My afr was waaaay too high (lean). Would say get a wideband on it before you turn up the pressure though because yours might be the opposite. It's a very hard guessing game is fuel pressure unfortunately. Mines not spot on but it's 14 on normal driving and 11-12 on boost , and it pulls fine now with no misfiring or flat spots Quote Link to post Share on other sites
akyakapotter Posted May 9, 2012 Share Posted May 9, 2012 fitting my depo wide band tomorrow Quote Link to post Share on other sites
funny onion Posted May 9, 2012 Share Posted May 9, 2012 fitting my depo wide band tomorrow Do you have 2 bungs in your decat or are you running an adapter to the ecu? Quote Link to post Share on other sites
russ78 Posted May 9, 2012 Author Share Posted May 9, 2012 fitting my depo wide band tomorrow thanks so much...... haha Quote Link to post Share on other sites
russ78 Posted May 9, 2012 Author Share Posted May 9, 2012 My afr was waaaay too high (lean). Would say get a wideband on it before you turn up the pressure though because yours might be the opposite. It's a very hard guessing game is fuel pressure unfortunately. Mines not spot on but it's 14 on normal driving and 11-12 on boost , and it pulls fine now with no misfiring or flat spots surley i can just go to a (not so fussy) tuners and they can tell me my afr and rectify any iregularitys ? Quote Link to post Share on other sites
akyakapotter Posted May 9, 2012 Share Posted May 9, 2012 Do you have 2 bungs in your decat or are you running an adapter to the ecu?i do have 2 bungs got the second one on my decat taken off and the one supplied welded on. No not running anything to the ecu i notice there is a white wire for that but i think thats more for piggy back ecu Quote Link to post Share on other sites
Azz Posted May 9, 2012 Share Posted May 9, 2012 fcd should be on 8 Quote Link to post Share on other sites
russ78 Posted May 9, 2012 Author Share Posted May 9, 2012 ill give it a try on 8 see how it goes,but im pretty sure its due to the rrfpr as cars not bringing up engine management light when it happens so says to me its tricking the ecu so the fcd working ?? Quote Link to post Share on other sites
funny onion Posted May 9, 2012 Share Posted May 9, 2012 Yeah preferably get it checked on rollers though so you can see what's happening right through the rev range. A reasonable tuners shouldn't charge you too much . The white wire is usually for data logging? (mines an aem so might be different) you can get an adapter to change the voltage output range of the wideband to the range needed by the ecu . Was a nightmare trying to get the bottom bung out of my decat, blow torch and breaker bars and all sorts, nearly snapped the engine mounts it was that tight lol Quote Link to post Share on other sites
akyakapotter Posted May 9, 2012 Share Posted May 9, 2012 it may be working but not quite enough little tweeking and im sure you will sort it Quote Link to post Share on other sites
akyakapotter Posted May 9, 2012 Share Posted May 9, 2012 Yeah preferably get it checked on rollers though so you can see what's happening right through the rev range. A reasonable tuners shouldn't charge you too much .The white wire is usually for data logging? (mines an aem so might be different) you can get an adapter to change the voltage output range of the wideband to the range needed by the ecu . Was a nightmare trying to get the bottom bung out of my decat, blow torch and breaker bars and all sorts, nearly snapped the engine mounts it was that tight lol i see i just had the bottem bung ground off only cost me £10 to have the new one welded Quote Link to post Share on other sites
funny onion Posted May 9, 2012 Share Posted May 9, 2012 Yeah that was plan b haha. It eventually cracked off though Quote Link to post Share on other sites
jayc-glanza17 Posted May 9, 2012 Share Posted May 9, 2012 what tuners u go to pal??i know two decent ones in essex. Quote Link to post Share on other sites
russ78 Posted May 9, 2012 Author Share Posted May 9, 2012 (edited) i spoke to a guy at Atspeed in rayleigh but he really wasnt interested unless i had aftermarket engine management, when i told him my setup he just said "no matter what u do u will always hit fuel cut unless you have some proper management" which i know hes got the right idea aftermarket management is the way to go but doesnt mean rrfpr and fcd wont be effective also if its setup correctly which is kinda why i rang him ??? Edited May 9, 2012 by russ78 Quote Link to post Share on other sites
russ78 Posted May 10, 2012 Author Share Posted May 10, 2012 tryed it setting 8 for a day and it did hit fuel cut , im really at a loss i need to know if a fcd is wired up will it not hit fuel cut at all or are there certain limits ? Quote Link to post Share on other sites
funny onion Posted May 10, 2012 Share Posted May 10, 2012 like i say mate, whatever setting my fcd was on it showed symptoms of fuel cut (i don't think it was fuel cut from the ecu, it was the afr shooting through the roof). Quote Link to post Share on other sites
russ78 Posted May 10, 2012 Author Share Posted May 10, 2012 cheers matey, but this isnt symptoms this is proper fuel cut jolting the whole car, maybe i havnt wired the fcd in correct ? i checked over and over again just dont make sense you know what i mean Quote Link to post Share on other sites
mrkd5916 Posted May 10, 2012 Share Posted May 10, 2012 how have you got the reading 3.1on the fprr? was it with the vac line on or off? Quote Link to post Share on other sites
russ78 Posted May 10, 2012 Author Share Posted May 10, 2012 (edited) was set with vac line off and i have a gauge on the rrfpr set it to that, would it still hit fuel cut if it was to lean then ? Edited May 10, 2012 by russ78 Quote Link to post Share on other sites
funny onion Posted May 10, 2012 Share Posted May 10, 2012 ah right i see, if you have a multimeter, check the power supply for the fcd. can only think that it's been wired in wrong :/ Quote Link to post Share on other sites
mrkd5916 Posted May 10, 2012 Share Posted May 10, 2012 cool cool ,i run mine at 3bar with out the vac line so it about 2.3 with it on, i think the fcd can make the car to run lean, Quote Link to post Share on other sites
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