BigMoistyturbo Posted January 12, 2004 Share Posted January 12, 2004 Under hard acceleration when I hit about 6000 rpm in 4th/5th it suddenly jerks and slows me down! The warning light and engine management light comes on. Whats happening? Quote Link to comment Share on other sites More sharing options...
CJ Posted January 12, 2004 Share Posted January 12, 2004 FCD needed perhaps? i.e. It is still "limited". I am sure someone with loads more knowledge will be along shortly. Quote Link to comment Share on other sites More sharing options...
BigMoistyturbo Posted January 12, 2004 Author Share Posted January 12, 2004 I was told it's not limited and I'm sure I've been over 120... Besides it happens under 120! Quote Link to comment Share on other sites More sharing options...
GavinL Posted January 12, 2004 Share Posted January 12, 2004 Originally posted by BigMoistyturbo I was told it's not limited and I'm sure I've been over 120... Besides it happens under 120! Do a search on fuel cut and all will be revealed Quote Link to comment Share on other sites More sharing options...
BigMoistyturbo Posted January 12, 2004 Author Share Posted January 12, 2004 I'm not very techie minded...so I need an fcd right? How much do these cost to buy and fit and how do they solve the problem? Quote Link to comment Share on other sites More sharing options...
CJ Posted January 12, 2004 Share Posted January 12, 2004 Click the link to Thor above. The follow the link to TRL and look under products. Quote Link to comment Share on other sites More sharing options...
BigMoistyturbo Posted January 12, 2004 Author Share Posted January 12, 2004 So why does the stock supra cut out then? Is it wise to install an fcd? Isn't that going against a safety feature? Quote Link to comment Share on other sites More sharing options...
Supra ST Myster Posted January 12, 2004 Share Posted January 12, 2004 you shouldnt be hitting fuel cut if your car is stock, i would then say possibly that its the spark plugs that could cause this? Quote Link to comment Share on other sites More sharing options...
CJ Posted January 12, 2004 Share Posted January 12, 2004 If I was you I would get in touch with Dude or Paul E. I am sure they will sort out whtever the problem is. Quote Link to comment Share on other sites More sharing options...
Scooter Posted January 12, 2004 Share Posted January 12, 2004 Originally posted by BigMoistyturbo So why does the stock supra cut out then? Is it wise to install an fcd? Isn't that going against a safety feature? yes in a way, but depending on the the type of FCD you put in, a new higher limit is set. So you can up the boost level and be in the higher performance / 'acceptable' reliablility zone of boost but still with the added protection to stop excessive boost and (hopefully) turbo failure or engine melt down. Quote Link to comment Share on other sites More sharing options...
Steve Cargill Posted January 12, 2004 Share Posted January 12, 2004 Originally posted by supra TT myster you shouldnt be hitting fuel cut if your car is stock, i would then say possibly that its the spark plugs that could cause this? Plugs wouldn't cause the lights to come on, when they stop working due to boost it feels like a 'soft cut', not big bang (not yet anyway...) just doesn't boost anymore. Fule cut and speed limiter are not related. Description sounds just like fuel cut. Are you sure it's stock? Has this just started happeneing in the cold weather? Have you got a boost gauge? If not GET ONE NOW I predict you've got no 2 cat removed. Quote Link to comment Share on other sites More sharing options...
Paul R Posted January 12, 2004 Share Posted January 12, 2004 Sounds like fuel cut to me. Paul. Quote Link to comment Share on other sites More sharing options...
far Posted January 12, 2004 Share Posted January 12, 2004 Originally posted by Steve Cargill Has this just started happeneing in the cold weather? Have you got a boost gauge? If not GET ONE NOW I predict you've got no 2 cat removed. Both my pussies are in and I still get fuel cut as I have a less restrictive back box than stock,your description very much mirrors what happened to my car.Best to get a VFCC from TRL performance dead easy to fit (4 wires to wire up to your ECU IGN,GND MAP input & Map Output) and as scooter suggested you can dial up your setting so is much better than others available. Quote Link to comment Share on other sites More sharing options...
BigMoistyturbo Posted January 12, 2004 Author Share Posted January 12, 2004 I'm pretty sure it's stock and has both cats. I'll get an fcd and see if that cures it. It's just annoying being limited to 6000 rpm!!!! Quote Link to comment Share on other sites More sharing options...
BigMoistyturbo Posted January 12, 2004 Author Share Posted January 12, 2004 P.s I do have a boost gauge and according to that I'm hitting 1 bar of boost. Quote Link to comment Share on other sites More sharing options...
Steve Cargill Posted January 12, 2004 Share Posted January 12, 2004 Stock fuel cut is just under 1 bar and there is no way you'd hit that with a stock exhaust and cats. If you look down from the engine bay the 1st cat is abiut the size of a stubby 1.5L coke bottle. To see the 2nd cat look under the drivers door. The search button is your friend look at the pictures in the 1st few posts. http://www.mkivsupra.net/vbb/showthread.php?s=&threadid=9378 Quote Link to comment Share on other sites More sharing options...
BigMoistyturbo Posted January 12, 2004 Author Share Posted January 12, 2004 Hmm you've got me wondering now as the exhaust isn't standard, I wonder if it's replaced one of the cats? When I had a look under it whilst it was on the ramps it looked like it had two cats but I wasn't looking for them to be honest! Quote Link to comment Share on other sites More sharing options...
SimonB Posted January 12, 2004 Share Posted January 12, 2004 Stock boost is 0.75ish, so you've definitely got less than 2 cats, an aftermarked exhaust, a bleed valve or something or a leak in a hose somewhere Quote Link to comment Share on other sites More sharing options...
Paul R Posted January 12, 2004 Share Posted January 12, 2004 Originally posted by SimonB Stock boost is 0.75ish, so you've definitely got less than 2 cats, an aftermarked exhaust, a bleed valve or something or a leak in a hose somewhere I hit 0.9 bar in my totally standard J-spec auto. Well totally standard appart from the boost guage! If you had a different back box then I suppose that it could take you to 1 bar? Paul. Quote Link to comment Share on other sites More sharing options...
BigMoistyturbo Posted January 12, 2004 Author Share Posted January 12, 2004 The boost gauge definately hits 1 bar...wether it's a true reading or not I have no idea. The main thing is thou will an fcd stop my original problem of the engine management light and hazard light coming on and me head butting the ateering wheel? Quote Link to comment Share on other sites More sharing options...
Steve Cargill Posted January 12, 2004 Share Posted January 12, 2004 Originally posted by BigMoistyturbo The main thing is thou will an fcd stop my original problem of the engine management light and hazard light coming on and me head butting the ateering wheel? In a word, yes. It's generally considered safe (just) to about 18psi (1.2??) if your fuelling is in good shape. Don't forget the fuel cut is there for a reason. As you're only hitting it occasionally you probably wouldn't get much higher (apart from and airfield run) anyway. From underneath I don't think you can see cat 1. Some systems have a box in each of the branches at the back, in addition to the back box and 2 cats. Quote Link to comment Share on other sites More sharing options...
far Posted January 13, 2004 Share Posted January 13, 2004 Originally posted by Paul R I hit 0.9 bar in my totally standard J-spec auto. Well totally standard appart from the boost guage! If you had a different back box then I suppose that it could take you to 1 bar? Paul. I hit 1 bar on a stock set-up with just an aftermarket back - box but only on chilly cold nights.I defo dont have any cats removed or a bleed valve. Quote Link to comment Share on other sites More sharing options...
Steve W2 Posted January 13, 2004 Share Posted January 13, 2004 I get a similar thing, at about 120 the hazard light comes on and the car stutters a bit but if I keep my foot down it still keeps going to 140, 150 leptons but with the hazard light 'flickering'. Does this sound like fuel cut? I thought it was obvious when the fuel was cut as there would be a big loss of power and noticable loss of speed. Damn, just sold my FCD to Far:D Quote Link to comment Share on other sites More sharing options...
Steve Cargill Posted January 13, 2004 Share Posted January 13, 2004 Originally posted by Steve W2 Does this sound like fuel cut? I thought it was obvious when the fuel was cut as there would be a big loss of power and noticable loss of speed. Damn, just sold my FCD to Far:D There are lots of descriptions of fuel cut, basically the 1st time you will stain your trousers as if feels like something major has blown up. It's a sudden harsh loss of power that lasts for a second or so then back to normal. The flashing lights sounds like something different, possibly a duff de-limiter. Quote Link to comment Share on other sites More sharing options...
SimonB Posted January 13, 2004 Share Posted January 13, 2004 Originally posted by Steve W2 I get a similar thing, at about 120 the hazard light comes on and the car stutters a bit but if I keep my foot down it still keeps going to 140, 150 leptons but with the hazard light 'flickering'. Does this sound like fuel cut? I thought it was obvious when the fuel was cut as there would be a big loss of power and noticable loss of speed. Damn, just sold my FCD to Far:D Could be spark plugs if you haven't put colder grade ones in. Quote Link to comment Share on other sites More sharing options...
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