AC93 Posted April 20, 2017 Share Posted April 20, 2017 Hi everyone, BPU'ing my stock Supra after a year of ownership and have ordered decat pipes, exhaust, fuel pump, boost controller. I recently bought a second hand HKS FCD and was looking through the install guide and couldn't help but read all the negatives about it ruining the voltage signal and that it was 'the worst kind'. Then other people say they've had it for x amount of years with no issues? I thought most people on here running BPU have this unit fitted? Has anyone actually had problems with it? What other options are there for the stock ECU? Or is it fine and I should just go ahead and wire it in? Mucho Gracias, Quote Link to comment Share on other sites More sharing options...
Rob W Posted April 20, 2017 Share Posted April 20, 2017 IIRC people only use to say it was bad as it totally gets rid of fuel cut, unlike some others that raise the limit. I had one fitted for years before I got the Mines ECU, never had a problem with it. Quote Link to comment Share on other sites More sharing options...
Scooter Posted April 20, 2017 Share Posted April 20, 2017 I prefer Chris Wilson's one that doesn't have the associated/implied issues, it was £60 or so quid well spent in my eyes, but agree that many people have them with no real issues too. Quote Link to comment Share on other sites More sharing options...
Frank Bullitt Posted April 20, 2017 Share Posted April 20, 2017 Can't go wrong with CW's stuff - http://www.mkivsupra.net/vbb/showthread.php?337727-Top-quality-fully-calibrated-fuel-cut-defenders Quote Link to comment Share on other sites More sharing options...
Marcus GTE Posted April 21, 2017 Share Posted April 21, 2017 IIRC people only use to say it was bad as it totally gets rid of fuel cut, unlike some others that raise the limit. I had one fitted for years before I got the Mines ECU, never had a problem with it. If that was the case why would it have the dial on it under the sticker to set it? There must be a degree of tuning on it with regards to raising the limit. Perhaps people who have issues have it on the wrong setting? Not saying it's the best out there But there's been no issues with mine. Quote Link to comment Share on other sites More sharing options...
Scooter Posted April 21, 2017 Share Posted April 21, 2017 From what I've read it does something else re a voltage that can effect the fueling? Quote Link to comment Share on other sites More sharing options...
Marcus GTE Posted April 21, 2017 Share Posted April 21, 2017 In what way?, can you remember? Just out of interest. Quote Link to comment Share on other sites More sharing options...
Scooter Posted April 21, 2017 Share Posted April 21, 2017 Per CW http://www.mkivsupra.net/vbb/showthread.php?327206-Top-quality-precision-fuel-cut-defenders-(FCD-s)&highlight=Defender Quote Link to comment Share on other sites More sharing options...
Scooter Posted April 21, 2017 Share Posted April 21, 2017 Loads of tech stuff in here. http://www.mkivsupra.net/vbb/archive/index.php/t-257044.html Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted April 22, 2017 Share Posted April 22, 2017 Mine is like the discontinued Greddy one. The MAP sensor output voltage is TOTALLY untouched until the clamp level. The HKS one is bizarre and whatever the clamp voltage is set to, it alters the MAP sensor output voltage, throughout the output curve. This changes the fuelling even when off boost, or on boost well below the cut off level. I was going to make a video of one on the test bench but decided I was no video maker in the end Quote Link to comment Share on other sites More sharing options...
Scooter Posted April 22, 2017 Share Posted April 22, 2017 Mine had a few niggles when I first got it, can't be 100% if it was all or some of the following, vsv's, hks fcd and electronic boost controller, but I'm happier now with CW's fcd, especially as now I've slightly upped the boost on the first turbo so fuelling is the last thing I want to be affected in the low/mid rev range. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.