Dash Rendar Posted January 24, 2007 Share Posted January 24, 2007 I was going down this private dual carriage way I know the other day, flooring it in third with OD off. I hit around 120 (I think), when suddenly the red warning light appeared on the dash and the car suddenly stopped accelerating and boost was killed. It almost felt like I'd hit the brakes, because it was accelerating so hard before. That's never happened before. I cruised home and subsequently noticed that the paintwork above the exhaust has been scorched. It looks like I had some serious flamage. I wondered if I'd hit the limiter in third, but 120 seems a little slow for that. The car is supposed to have FCD. I was running about 1.2 bar. It's been running fine since, though I haven't had an opportunity to gun it so fast since then. Any ideas what's going on? (Afterthought: I normally always run the car with the removable silencer in the Blitz exhaust. This was one of the rare occasions where I've floored it without the silencer. I wonder if it might help prevent flamage?) Quote Link to comment Share on other sites More sharing options...
Ric Posted January 24, 2007 Share Posted January 24, 2007 boost cut perhaps Quote Link to comment Share on other sites More sharing options...
hadyn Posted January 24, 2007 Share Posted January 24, 2007 flamage was probably caused by the everything just stopping as it did, ecu chucking loads of fuel in that wasnt needed, and boom unburnt fuel being burnt off in the zorst Autos dont flame that much do they? Quote Link to comment Share on other sites More sharing options...
letmeshowyou Posted January 24, 2007 Share Posted January 24, 2007 did you see the actual boost figure? What FCD are you using? In this cold weather it wouldnt surprise me if you're boosting higher than you thought and it was infact fuel cut. Quote Link to comment Share on other sites More sharing options...
Dash Rendar Posted January 24, 2007 Author Share Posted January 24, 2007 Ah, that could certainly explain the flamage. Having read about the symptoms for fuel cut, it certainly looks like that might have been the problem. I don't know what FCD I've got. It was fitted by an infamous three-legged racehound a while back, but I haven't spoken to him for a long time. Thing is... I'm sure I would have hit fuel cut before if I didn't have one. This isn't the first time I've floored it at that sort of speed. Maybe it's malfunctioning or stopped working? It is possible I was overboosting. I've seen it occasionally hit 1.3-1.4 bar, but it does seem pretty random. Sometimes 1.2. I've got to admit, I wasn't looking that closely at the boost guage. Quote Link to comment Share on other sites More sharing options...
Dash Rendar Posted January 24, 2007 Author Share Posted January 24, 2007 P.S. Even with FCD, can you still get fuel cut if you over boost? Quote Link to comment Share on other sites More sharing options...
Ric Posted January 24, 2007 Share Posted January 24, 2007 some FCD's can raise the fuel cut limit to a higher amount of boost so you have some failsafe still in place. If it was say 1.45 and you overboosted to that you would indeed hit fuelcut in the same way Quote Link to comment Share on other sites More sharing options...
letmeshowyou Posted January 24, 2007 Share Posted January 24, 2007 yeah that - some FCD's leave fuel cut in, just raise the limit. This is the case with the thor one. It would be worth a quick investigation in the foot well to know for def Was it late at night? If so my money is definitely on boosting higher than you think in the cold! Quote Link to comment Share on other sites More sharing options...
hadyn Posted January 24, 2007 Share Posted January 24, 2007 Thor FCDs are set to cut at 1.25 bar arent they? Quote Link to comment Share on other sites More sharing options...
letmeshowyou Posted January 24, 2007 Share Posted January 24, 2007 you can adjust them. I'm not sure where the stock settings put you though. Quote Link to comment Share on other sites More sharing options...
Bob Posted January 24, 2007 Share Posted January 24, 2007 Is your car restricted to 112mph still? If the speedo read around 120 leptons, then that would be about right for real world speed. Quote Link to comment Share on other sites More sharing options...
Wez Posted January 24, 2007 Share Posted January 24, 2007 Quote Link to comment Share on other sites More sharing options...
Dash Rendar Posted January 24, 2007 Author Share Posted January 24, 2007 Thanks everyone. If the Thor FCD is set to 1.25 bar, that could certainly explain it. It wasn't at night, but it was certainly a cold day. I thought the car was derestricted, and I can't believe I'ver never done over 120 leptons before. Also, I've got a dyno graph that covers the full rev range in third. Presumably, that wouldn't be possible if the car was still limited. Quote Link to comment Share on other sites More sharing options...
letmeshowyou Posted January 24, 2007 Share Posted January 24, 2007 ps. just spotted about the silencer being out - this could affect boost also Quote Link to comment Share on other sites More sharing options...
Dash Rendar Posted January 24, 2007 Author Share Posted January 24, 2007 Agreed. On the dyno, the silencer costs me approx 10bhp, so I guess it does restrict boost a little. Quote Link to comment Share on other sites More sharing options...
Ian C Posted January 25, 2007 Share Posted January 25, 2007 The speed limiter is a soft cut, nothing like fuel cut. That sounds like you've got a raised fuel cut limit and you hit it in the cold. The silencer being out will probably let you hit higher boost, as would the colder weather. You need to limit boost and not raise your fuel cut limit, by the way -Ian Quote Link to comment Share on other sites More sharing options...
Dash Rendar Posted January 25, 2007 Author Share Posted January 25, 2007 Thanks! The restrictor ring seems to not be reliable for limiting boost... Quote Link to comment Share on other sites More sharing options...
Homer Posted January 25, 2007 Share Posted January 25, 2007 Thanks! The restrictor ring seems to not be reliable for limiting boost... This is perfectly normal behaviour. With current air temps turbo cars will reach much higher boost levels, mine used to do it every time I hit opened it up in 4th, 5th or 6th when temps were below 5 degrees. In an ideal world you'd have a restrictor ring set so that in current conditions you would be just below fuel cut, then use a boost controller during warmer months to raise boost past the level the restrictor normally allows. Hope you're well mate, not seen you about for a long time! Quote Link to comment Share on other sites More sharing options...
Dash Rendar Posted January 26, 2007 Author Share Posted January 26, 2007 Aye, that makes sense. Though I'm not really thinking about spending more money on the car at the moment. With the silencer back in, I'm sure it will behave itself a little better. Sorry I haven't been about much. So much to do... I haven't really been spending enough quality Supra time lately. We'll have to do a pub lunch soon. Quote Link to comment Share on other sites More sharing options...
Homer Posted January 26, 2007 Share Posted January 26, 2007 We'll have to do a pub lunch soon. We had the mods meet in the Golden Retriever last weekend, the burgers are still superb Will arrange one in February so us Bracknell office bods can get together again (and skyve off a few hours of work on a Friday ) Quote Link to comment Share on other sites More sharing options...
Class One Posted January 26, 2007 Share Posted January 26, 2007 Arrange it on one of my days off, and I'm in! Quote Link to comment Share on other sites More sharing options...
imi Posted January 26, 2007 Share Posted January 26, 2007 Agreed. On the dyno, the silencer costs me approx 10bhp, so I guess it does restrict boost a little. what about an AC Quote Link to comment Share on other sites More sharing options...
Dash Rendar Posted January 26, 2007 Author Share Posted January 26, 2007 There are some mistakes that can never be put to rest! Quote Link to comment Share on other sites More sharing options...
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