Chris Wilson Posted February 23, 2018 Share Posted February 23, 2018 I have just done a new batch of these, and they tend to sell quite fast. Since Greddy and TRL stopped doing their very nice and reliable fuel cut defenders I have been wondering about building a sensibly priced alternative. The great thing with the Greddy is it did not clamp the MAP sensor voltage until the pre-set threshold was reached. The HKS one was not so nice and skewed the output from the MAP sensor, thereby also skewing the fuel curve. I have now tooled up to produce my own FCD that leaves the MAP sensor output *totally* unaltered until the voltage clamp threshold is reached, just like the Greddy ones did, when they were still available, but using more modern, closer tolerance components and a slight circuit improvement. It also uses the same colour wires as the Greddy, meaning the excellent on line pictorial fitting instructions at http://mkiv.com/techarticles/bcc/bcc_install/bcc.htm can be used to aid fitting, which is very easy. They come with an earth eyelet ready soldered on, meaning only three other wires to connect. Use the central stud or the main ecu to floor pan for th earth terminal, under the 10mm socket size nut. They come pre set on lab standard equipment,to suit either VVTi or earlier TT models. If you have a VVTi or 1JZ-GTE let me know when ordering. I have 6 ready to ship, the last batch sold out very quickly. They can be programmed for other MAP sensor turbo engines like Mitsubishis, RX7's, Skylines, MR2 turbos, blah blah. If you can mention them on other forums where you may be a member I will be very grateful! Price is £65 plus VAT with £5.80 plus VAT insured P&P to any UK post code. That's £84.96 grand total. Please ask for a delivery price to other places if required. Thanks. - - - Updated - - - I can supply wiring schematic for the VVTi if required. Just different ecu pins used, as easy to fit to a VVTi as a none VVTi engine, 4 wires to connect, one being an eyelet terminated ground wire like the none VVTi ones. Link to comment Share on other sites More sharing options...
AC93 Posted February 23, 2018 Share Posted February 23, 2018 I can vouch for these, had mine for almost a year and has been faultless! Link to comment Share on other sites More sharing options...
Chris Wilson Posted February 23, 2018 Author Share Posted February 23, 2018 I can vouch for these, had mine for almost a year and has been faultless! Thank you, but it should remain that way for a lot longer than that I hope! Link to comment Share on other sites More sharing options...
jza800 Posted February 23, 2018 Share Posted February 23, 2018 Hi i have another ?, is it possible to find out when it goes to fuel cut, without driving the car, by taking the mityvac pump direct to the map sensor, and pump air in, and messure the voltage by the ecu? Link to comment Share on other sites More sharing options...
Chris Wilson Posted February 23, 2018 Author Share Posted February 23, 2018 Yes, but the Mityvac is not easy to regulate to a fine pressure level. I use an air bottle with a decent pressure regulator T'd into an accurate pressure gauge. There is quite a span on level as the sensors output voltage V pressure on their port levels seem to vary quite a bit. The 5V ECU reference source should be rock solid, so variations will be the sensor itself. Link to comment Share on other sites More sharing options...
jza800 Posted February 23, 2018 Share Posted February 23, 2018 Ok, can you give some advise at whar range you normal clamp the voltage on a jdm supra. i now it can very alot from sensor to sensor.. i is just so i have a little guide line.. Link to comment Share on other sites More sharing options...
Chris Wilson Posted February 23, 2018 Author Share Posted February 23, 2018 If you clamp a none VVTi around 4.2V max you should be OK. The odd car will cut a tad before though. Link to comment Share on other sites More sharing options...
jza800 Posted February 23, 2018 Share Posted February 23, 2018 Mine is at 4.3v now. havent jet driven the car so dot how if it is enough... what do you mean with this -> The odd car will cut a tad before though. Link to comment Share on other sites More sharing options...
Tommyd16 Posted February 23, 2018 Share Posted February 23, 2018 Sent you an email Chris Link to comment Share on other sites More sharing options...
jza800 Posted February 26, 2018 Share Posted February 26, 2018 ??? Link to comment Share on other sites More sharing options...
Frank Bullitt Posted February 26, 2018 Share Posted February 26, 2018 ??? Maybe if your posts above were in the slightest bit fathomable Chris would have been able to understand them and reply. Failing that how about picking up the phone and talking in old money rather than grunts? Link to comment Share on other sites More sharing options...
Chris Wilson Posted February 26, 2018 Author Share Posted February 26, 2018 I am not even sure if he's talking about one of mine. One tries,,,, Link to comment Share on other sites More sharing options...
jonny mac Posted February 28, 2018 Share Posted February 28, 2018 interested, what boost pressure/voltage does the sensor clamp the reading at? the ecu is programmed to fuel cut at 1 bar isn't it? I've just put my car together, factory twins vvti engine and a full 3" exhaust, I have a whifbitz restrictor ring in the exhaust so is it likely i'll need to add your fuel cut prevention sensor into the ecu loom? Link to comment Share on other sites More sharing options...
Chris Wilson Posted February 28, 2018 Author Share Posted February 28, 2018 Well, the sensor doesn't do any clamping, it has enough headroom to allow the ecu map to cut fuel at about 1 Bar, it keeps reading a bit higher and runs out of range just above 1 Bar. My FCD is adjustable to clamp between 3V and 6V, and i set none VVTi ones at about 4.1V. Above that the ECU thinks the MAP sensor is going no higher and still allows fuelling. 1.2 Bar is he top limit for adequate fuelling, maybe a TAD higher... Toyota over fuelled substantially at high boost to keep the cats cool, so you have that excess to play with given a de-catted engine. Does that help? With a 3 inch bore system of low back pressure you probably need a restrictor ring, depends on health of turbos and engine in general. If you don't hit fuel cut without an FCD it suggests something's wrong or tired. Link to comment Share on other sites More sharing options...
jonny mac Posted March 1, 2018 Share Posted March 1, 2018 how high do they usually spike with a 3" decatted exhaust and a restrictor plate anyway? I'm quite keen to get one as my car is not on the road yet but I can see the first thing to happen is fuel cut due to all the bpu stuff I've done and no restrictions in the exhaust system delivery price to Aberdeen Scotland please Link to comment Share on other sites More sharing options...
Chris Wilson Posted March 1, 2018 Author Share Posted March 1, 2018 £84.96 all in, delivered. No way to say how high it might spike, it certainly should hit fuel cut with such a big exhaust though! Thanks Jonny. Link to comment Share on other sites More sharing options...
jonny mac Posted March 2, 2018 Share Posted March 2, 2018 ok, should I just email you and you can invoice my paypal? Link to comment Share on other sites More sharing options...
Chris Wilson Posted March 2, 2018 Author Share Posted March 2, 2018 ok, should I just email you and you can invoice my paypal? Sure, just e-mail me at [email protected] with your desired e-mail and Paypal addresses and I'll do a request for money via Paypal. Thanks Link to comment Share on other sites More sharing options...
Supraleeturbo Posted March 9, 2018 Share Posted March 9, 2018 Hi how can I order a vvti gte fcd please Link to comment Share on other sites More sharing options...
jza800 Posted March 9, 2018 Share Posted March 9, 2018 Well, the sensor doesn't do any clamping, it has enough headroom to allow the ecu map to cut fuel at about 1 Bar, it keeps reading a bit higher and runs out of range just above 1 Bar. My FCD is adjustable to clamp between 3V and 6V, and i set none VVTi ones at about 4.1V. Above that the ECU thinks the MAP sensor is going no higher and still allows fuelling. 1.2 Bar is he top limit for adequate fuelling, maybe a TAD higher... Toyota over fuelled substantially at high boost to keep the cats cool, so you have that excess to play with given a de-catted engine. Does that help? With a 3 inch bore system of low back pressure you probably need a restrictor ring, depends on health of turbos and engine in general. If you don't hit fuel cut without an FCD it suggests something's wrong or tired. That was exact the answer i was looking for.. i dont have chris fcd but a build in fcd in my boost controllere. so needede some guidens where i should set my clamp voltage at... thanks Chris.. hope it was alright to ake inhere.. Link to comment Share on other sites More sharing options...
Chris Wilson Posted March 9, 2018 Author Share Posted March 9, 2018 Hi how can I order a vvti gte fcd please Same as for Jonnymac, just e-mail me at [email protected] and I will send you payment options. I have a few left. Thanks Link to comment Share on other sites More sharing options...
Supraleeturbo Posted March 9, 2018 Share Posted March 9, 2018 Same as for Jonnymac, just e-mail me at [email protected] and I will send you payment options. I have a few left. Thanks Email sent mate Link to comment Share on other sites More sharing options...
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