GetawayDriver Posted January 21, 2005 Share Posted January 21, 2005 I've just had a boost controller fitted to my UK TT 6 along with an FCD. I've been playing with the settings and trying different levels of boost/gain etc. i've got everything set so maximum boost is about 1.2 bar depending on the ambient air temp and boost response is reasonable. Here's my settings CH1 to 20mph 80 gain 26 CH2 to 40mph 75 gain 26 CH3 to 60mph 65 gain 26 CH4 60mph + 62 gain 26 I've based my settings on JB's figures, with little tweaks to get similar max boost on CH1 and CH2. see JB's settings here --> http://www.mkivsupra.net/vbb/showthread.php?t=4547 But i have a problem, under hard acceleration in a high gear, 4th, 5th, even 6th as the boost builds there is suddenly a huge bang, mostly from the drivetrain, as fuel/boost is cut, total loss of power violently. Engine light comes on and stays on for about 5 secs. Obviously it really upsets the cars stability too when it happens, It happened lastnight almost flat out in 5th in the rain, needless to say i almost shat myself. My questions: Is this fuel cut? i'm pretty sure it is, but it never seemed so violent in other members posts i read. it's different when it happens to you... sob What damage can this do? aside from the savage trauma the transmission and my underwear. I'm guessing it's caused by a boost spike, what causes boost spikes likes this? How much extra boost does the FCD let you have before invoking fuel cut? I know the overall solution is to turn the boost down... but it feels so good! and i'm running the same figures as JB who also has a UK spec and who doesn't get fuel cut. why? I still have one Cat, i'm guessing JB has none, could that cause it? Link to comment Share on other sites More sharing options...
Matt Harwood Posted January 21, 2005 Share Posted January 21, 2005 Hmmm, sounds like fuel cut still. Let me have a quick chat with Pete, it may need adjustment or changing over. You really don't want to be hitting fuel cut too often! Link to comment Share on other sites More sharing options...
Adam Kindness Posted January 21, 2005 Share Posted January 21, 2005 fuel cut was never that severe in my J-spec.... more like a rev limiter effect, no lights, no bangs Whats the URL for TRL FCD's again? Link to comment Share on other sites More sharing options...
tbourner Posted January 21, 2005 Share Posted January 21, 2005 It was quite violent the few times mine did it, warning light in middle of dash, I let off the throttle for a few seconds just from shock - no bangs though just loss of momentum from sudden engine braking. Link to comment Share on other sites More sharing options...
Adam Kindness Posted January 21, 2005 Share Posted January 21, 2005 UK or JSpec... Maybe i have just forgotten about the warning lights etc Link to comment Share on other sites More sharing options...
Stevie Boy Posted January 21, 2005 Share Posted January 21, 2005 Sounds defo like the FCD may need a little adjustment, my fuel cut was exactly like that, racing an EVO6 just slipped into top gear, boost just coming on song, pulling ahead nicely then BANG!! lights on the dash loss of power etc, then back to life again after slowing down and pooping oneself. I take it it's a genuine HKS FCD???? What have you got it set to? Think when i used to have my FCD, after decatted with restrictor ring boost was peaking approx 1.1-1.2bar and FCD was set to channel 9, dunno if you can just adjust it a little more to compensate for boost spikes from having the boost controller (thought boost controllers were meant to smooth out boost spikes??) Link to comment Share on other sites More sharing options...
GetawayDriver Posted January 21, 2005 Author Share Posted January 21, 2005 i think it's a TRL one, i didn't even know it was adjustable. I'm not even sure where it is. I'm sure Matt will come though with the info required to prevent further damage to my M&S briefs. Link to comment Share on other sites More sharing options...
Stevie Boy Posted January 21, 2005 Share Posted January 21, 2005 Think most of them are adjustable, but not summink you should just keep fanny about with if the boost cut comes in, sensible option is to turn boost down. HKS ones have a tamper sticker which is usually stuck over the adjustment potentiometer once set up, not familiar with the TRL, as you said Matt's the man!! Link to comment Share on other sites More sharing options...
LeeT Posted January 21, 2005 Share Posted January 21, 2005 when i fitted my TRL FCD and boost controller on my uk i still hit fuel cut at around the 1.2bar mark. pete at thor advised to adjust the internal pots to a higher setting. cant remember what they were now though. i can run 1.3bar with no bother at all now Link to comment Share on other sites More sharing options...
Adam Kindness Posted January 21, 2005 Share Posted January 21, 2005 i was able to run 1.5bar without adjustment on my hybrid j-spec. It was a TRL FCD Link to comment Share on other sites More sharing options...
GetawayDriver Posted January 21, 2005 Author Share Posted January 21, 2005 mine is also hitting fuel cut at arround 1.2 it seems, also UK. excuse my ignorance, what is an internal pot? is pete still on the forum? Link to comment Share on other sites More sharing options...
Stevie Boy Posted January 21, 2005 Share Posted January 21, 2005 Internal pot leetts refering to is the "Potentiometer" an adjustable screw, like whats behind the knob of a stereo volume control. Link to comment Share on other sites More sharing options...
LeeT Posted January 21, 2005 Share Posted January 21, 2005 Internal pot leetts refering to is the "Potentiometer" an adjustable screw, like whats behind the knob of a stereo volume control. exactly. there is two of them labelled ob(overboost) and gain IIRC. a>f and 0>9. they just need tweaking around a notch or two. pete will advise on the exact settings im sure. hes a very helpful bloke Link to comment Share on other sites More sharing options...
Adam Kindness Posted January 21, 2005 Share Posted January 21, 2005 Does pete only sell through Thor-racing now? Link to comment Share on other sites More sharing options...
Matt Harwood Posted January 21, 2005 Share Posted January 21, 2005 Jay, I can't get hold of Pete at the moment, but the choice is yours... Either, you can adjust the FCD yourself and see if it works, or you're more than welcome to come down here tomorrow and we'll adjust it for you or change it, if it's faulty... Link to comment Share on other sites More sharing options...
GetawayDriver Posted January 21, 2005 Author Share Posted January 21, 2005 No worries matt, Let me know the settings you recommend and I’ll try adjusting it myself first. Where did you guys mount it? Link to comment Share on other sites More sharing options...
Matt Harwood Posted January 21, 2005 Share Posted January 21, 2005 The FCD will be mounted very near/under the ECU. Lift the carpet and unbolt the black plastic ECU cover and I'm sure you'll locate it easily enough. Open up the FCD, inside you'll find two small pots, (dials). The one labelled OB or Overboost, should be set to position B as standard, increase this to C, and it should stop your problems. Feel free to phone if you're not sure about anything. Link to comment Share on other sites More sharing options...
Markie Posted January 21, 2005 Share Posted January 21, 2005 I have, I think ;-) not looked at it properly, a HKS FCD. I had my Blitz SD blabla running at 55% gain - 12. It has been boosting fine up around 1.2 1.3. However this morning I had the FCD kick in, as you say, loss in power etc etc. I think it was close to 1.4 this morning going by my gauges.. But until that happened the HKS has been letting me do good boost. J-SPEC. Would not be Rev limited or speed? By the way, any idea which I should belive, as my Defi guage and my Blitz boost controller say different peaks and slightly different readings, which should I belive the most? Link to comment Share on other sites More sharing options...
SteveL Posted January 21, 2005 Share Posted January 21, 2005 Jay, maybe I'm missing something - so this is only a suggestion .... If youre getting hard accelleration in lower gears without problems, this wouldn't be fuel cut - it sounds more like the prob I had with a loose connection in the wiring of my delimiter. My problem was the result of removing the upper dash a few times and eventally causing one of the wires to the ECU on the back of the odometer to become loose. I could be way off, and I'm in no way suggesting anyone else's comments are wrong ( or dissing workman-ship ) - it's just that the symptoms are exactly like mine were. Steve. Link to comment Share on other sites More sharing options...
tbourner Posted January 22, 2005 Share Posted January 22, 2005 Not necessarily, higher boost usually occurs in higher gears at WOT. Link to comment Share on other sites More sharing options...
SteveL Posted January 22, 2005 Share Posted January 22, 2005 Ok - so I was missing something I sit corrected - thanks tbourner..... Steve. Link to comment Share on other sites More sharing options...
tbourner Posted January 22, 2005 Share Posted January 22, 2005 You could be right anyway, just saying that I remember some people saying after fitting a FCD they still get fuel cut at redline in higher gears! Haven't tried redline in 6th on mine yet though!! Link to comment Share on other sites More sharing options...
GetawayDriver Posted January 23, 2005 Author Share Posted January 23, 2005 It could be either of the things you both suggested. I think there may have been a loose connection before i had the boost controller and fcd fitted. I also have a blitz turbo timer which sometimes records a peak speed of 399kph - i assume this could be caused by a faulty connection. Could this same fault affect the boost controllers speed detection cause undesired fuel cut? i haven't seen any weird max speed recorded on it, just some outrageous hp figures - seems to happen when the car looses traction. Having said that, fuel cut has always occured at the red line in 4th and 5th, not 3rd - given that experience, i'm in no hurry to try the red line in 6th. I shall do some investigations today - thanks for all your comments/ideas, i'll let you know how i get on. Link to comment Share on other sites More sharing options...
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