Matt H Posted June 23, 2006 Share Posted June 23, 2006 Hi All, Following on from my previous post: http://www.mkivsupra.net/vbb/showthread.php?t=65362&highlight=high+speed+boost I have taken a video (on a private road) from inside my car focusing on the dials (boost gauge and revs) As you can see from the video when the boost rises to around 1.1 bar or higher its quickly gets kicked back down to about 0.9 bar then rises again to about 1.1 bar then gets kicked back down which you can tell happens when the camera jolts forward cos that’s exactly what’s happening; there is a fast and strong jolt as the car, I suppose kicks down the power. I’m wondering if there is a problem with my HKS FCD but im not sure. Please watch the video (especially the experts and let me know what you think!) My car is BPU with: Hybrid Turbos Dual de-cat (first decat from Chris Wilson with restrictor ring) HKS FCD Blitz induction kit Blitz Nur spec r Exhaust Video: http://media.putfile.com/Private-Road-Test (I hope this works – first time I’ve uploaded a video!) All advice is welcome and greatly appreciated. Thanks Matt Quote Link to comment Share on other sites More sharing options...
Kopite Posted June 23, 2006 Share Posted June 23, 2006 Bit hard to tell from there because i'm on a laptop and can't hear anything But did you get the plugs changed? How long's the HKS FCD been in for? AFAIK these units can sometimes be a bit dodgy. Quote Link to comment Share on other sites More sharing options...
Matt H Posted June 23, 2006 Author Share Posted June 23, 2006 Bit hard to tell from there because i'm on a laptop and can't hear anything But did you get the plugs changed? How long's the HKS FCD been in for? AFAIK these units can sometimes be a bit dodgy. Had the mechanical side completely looked at by Chris Wilson, and everything is sound in that department. Its got to be elecrtical. Theres not much noise anyway, its just the drop then increase in boost and as a result rpm in such a drastic fashion thats what im trying to demostrate. Think the FCD beens in for a few years but i only bought the car a couple of months back and had the problem ever since i drove it home. Thought it was gear changes at first! Quote Link to comment Share on other sites More sharing options...
Bob Posted June 23, 2006 Share Posted June 23, 2006 I'm having something similar on standard boost, but only occasionally. I'll be changing the plugs, coil packs, fuel filter and fuel pump in a couple of weeks though and seeing if that helps at all. Quote Link to comment Share on other sites More sharing options...
Matt H Posted June 23, 2006 Author Share Posted June 23, 2006 Come on peeps, surely someone know something?!?! Quote Link to comment Share on other sites More sharing options...
Homer Posted June 23, 2006 Share Posted June 23, 2006 Pretty sure thats fuel cut. Is the HKS FCD adjustable? Quote Link to comment Share on other sites More sharing options...
letmeshowyou Posted June 23, 2006 Share Posted June 23, 2006 I'm pretty sure thats fuel cut too - if you pay attention between how long it lets you rev before it happens it seems to be every 3 seconds - time to get that FCD looked at! Quote Link to comment Share on other sites More sharing options...
Supra_Nish Posted June 23, 2006 Share Posted June 23, 2006 looks like the FCD playing up. I got a HKS one on mine too. Works fine, but u need it on the correct setting. Theres a small dial. Find it near the ECU and see what you got. I'll check whats on mine. Quote Link to comment Share on other sites More sharing options...
pistonbroke Posted June 23, 2006 Share Posted June 23, 2006 I'll put money on that being an FCD problem. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted June 23, 2006 Share Posted June 23, 2006 I have new Thor FCD's here, we can try one if you like, but I suspect it is NOT that. Quote Link to comment Share on other sites More sharing options...
Matt H Posted June 26, 2006 Author Share Posted June 26, 2006 I have new Thor FCD's here, we can try one if you like, but I suspect it is NOT that. What do you reckon then Chris if its not the FCD? I've bought a Thor FCD today second hand (dont think its been used tho), it will be worth trying it out tho. Quote Link to comment Share on other sites More sharing options...
Matt H Posted June 26, 2006 Author Share Posted June 26, 2006 looks like the FCD playing up. I got a HKS one on mine too. Works fine, but u need it on the correct setting. Theres a small dial. Find it near the ECU and see what you got. I'll check whats on mine. That would be great mate Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted June 26, 2006 Share Posted June 26, 2006 What do you reckon then Chris if its not the FCD? I've bought a Thor FCD today second hand (dont think its been used tho), it will be worth trying it out tho. For sure, I'd try the Thor FCD and see what happens, but, from the video, I suspect you may be having top speed delimiter issues, as I believe you said it only happens at the more illegal top speeds? If it was fuel cut it would happen at peak torque RPM at all road speeds in anything above 2 nd gear, at full boost. Weird one! The turbo "wastegate" being seized was not unprecidented, but I have heard of only one case of some weird top speed delimiter convertor having similar effects, although I dodn't see the car myself. A Thor top speed delimiter, correctly wired in, fixed it. It's so hard to tackle these very high speed problems, from my point of view, as i jsu will not drive that fast on the public road, it's too big a risk to my licence. It would be hard to mimick it on a rolling road without temps going ballistic. Quote Link to comment Share on other sites More sharing options...
Matt H Posted June 26, 2006 Author Share Posted June 26, 2006 For sure, I'd try the Thor FCD and see what happens, but, from the video, I suspect you may be having top speed delimiter issues, as I believe you said it only happens at the more illegal top speeds? If it was fuel cut it would happen at peak torque RPM at all road speeds in anything above 2 nd gear, at full boost. Weird one! The turbo "wastegate" being seized was not unprecidented, but I have heard of only one case of some weird top speed delimiter convertor having similar effects, although I dodn't see the car myself. A Thor top speed delimiter, correctly wired in, fixed it. It's so hard to tackle these very high speed problems, from my point of view, as i jsu will not drive that fast on the public road, it's too big a risk to my licence. It would be hard to mimick it on a rolling road without temps going ballistic. Cheers Chris, but it starts at about 90 from memory. I'll try the Thor FCD first, then if that doesnt help then well i suppose its back off to yours for a thor top speed delimiter thingy! Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted June 26, 2006 Share Posted June 26, 2006 Sounds a little like my problem here http://www.mkivsupra.net/vbb/showthread.php?t=72557 but after looking at the video it seems to cut boost a little quicker, but that may just be due to the speed and build up, mine seems to be down to the no 1 turbo waste gate VSV, i am in TTC but messing about with with the VSVs etc seems to cause no problems, just keep an eye out for boost going to high. Quote Link to comment Share on other sites More sharing options...
geoffvalenti Posted June 26, 2006 Share Posted June 26, 2006 I have taken a video (on a private road) from inside my car focusing on the dials (boost gauge and revs) Please tell me you weren't hand holding the video, whilst driving at 140 mph regardless of the fact that you were on a private road or not Quote Link to comment Share on other sites More sharing options...
Pixelfill Posted June 27, 2006 Share Posted June 27, 2006 You need to be very careful posting videos like that on public forums Matt. Mike Quote Link to comment Share on other sites More sharing options...
Matt H Posted June 28, 2006 Author Share Posted June 28, 2006 Please tell me you weren't hand holding the video, whilst driving at 140 mph regardless of the fact that you were on a private road or not I was driving with my knees and had a drink in hte other hand 2! Quote Link to comment Share on other sites More sharing options...
Ruff_Rider Posted June 28, 2006 Share Posted June 28, 2006 I'm not an expert, just an enthusiast, os go easy on me if what i say makes no sense. You seem to be running more than stock boost with your BPU's which is fine for the hybrids for example. Have you upgraded the fuel system at all i.e. fuel pump, fuel pressure regulator, injectors? More boost = more fuel. If your fuel system cannot meet demand then you may be experiencing fuel cut as there isn't enough fuel being supplied. Fuel pumps become inefficient with age so may need replacing or upgrading maybe? I'm thinking of upgrading to hybrids myself. Would like to go single but it's a bit more pricey and insurance can be a problem. Can anyone advise on whether it's worth going hybrid with all trimmings, ie fmic, boost controller, zorst and fuel etc, or spending bit more and going single? Quote Link to comment Share on other sites More sharing options...
Guest Mad Russ Posted June 28, 2006 Share Posted June 28, 2006 That could always be a small split in a boost pipe that is opening up under high load/ pressure Quote Link to comment Share on other sites More sharing options...
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