mattdavies Posted February 19, 2012 Share Posted February 19, 2012 (edited) i been looking in to fuel cut defenders and whole searching the web i noticed that there a re two main contenters for fuel cut defenders, Greddy BCC and HKS FCD. Just wondering which is the better one ? i have read that the greddy is better the HKS due to how it works BUT i believe most people use the HKS FCD. Any help or opinion is greatly valid Edited February 19, 2012 by Gaz6002 (see edit history) Quote Link to comment Share on other sites More sharing options...
Gaz6002 Posted February 19, 2012 Share Posted February 19, 2012 I've tweaked your thread title so people know which part you're on about. Quote Link to comment Share on other sites More sharing options...
welshbuddy Posted February 19, 2012 Share Posted February 19, 2012 turbosmart is also another choice mate. Quote Link to comment Share on other sites More sharing options...
mattdavies Posted February 19, 2012 Author Share Posted February 19, 2012 Pros / Cons / selling point over the above FCDs ? Quote Link to comment Share on other sites More sharing options...
Lude Posted February 19, 2012 Share Posted February 19, 2012 never really looked into them really, ive got a Blitz on mine, errr it cuts the fuel and lets me boost if thats any help Quote Link to comment Share on other sites More sharing options...
SteveC Posted February 20, 2012 Share Posted February 20, 2012 The difference is that the HKS affects the Turbo Pressure Sensor voltage all the time (not ideal), whereas the Greddy only affects the TPS voltage when the turbo pressure exceeds around 1 Bar. Quote Link to comment Share on other sites More sharing options...
mattdavies Posted February 20, 2012 Author Share Posted February 20, 2012 Therefore a greddy would be the better choice ?! Quote Link to comment Share on other sites More sharing options...
SteveC Posted February 20, 2012 Share Posted February 20, 2012 Out of the two, yes. That's what I use. Quote Link to comment Share on other sites More sharing options...
SteveC Posted February 20, 2012 Share Posted February 20, 2012 (edited) If you do decide on the Greddy, you can get one specifically for the Supra here. Edited February 20, 2012 by SteveC (see edit history) Quote Link to comment Share on other sites More sharing options...
mattdavies Posted February 20, 2012 Author Share Posted February 20, 2012 Thank you very much. Cheaper then I found elsewhere Quote Link to comment Share on other sites More sharing options...
Yakky Posted February 21, 2012 Share Posted February 21, 2012 The difference is that the HKS affects the Turbo Pressure Sensor voltage all the time (not ideal), whereas the Greddy only affects the TPS voltage when the turbo pressure exceeds around 1 Bar. This is not quite true. The HKS FCD changes the voltage at the certain voltage point onwards- so it does avoid changing off-boost map position. So this has the knockon effect of moving the map towards lean in order to allow for a mild boost upgrade. Lean is mean, especially if stock is rich for your setup. Greddy clamps voltage. Some say this is better, and it's probably true that it's safer because it's doesn't lean. Do you have a piggyback ECU? Quote Link to comment Share on other sites More sharing options...
mattdavies Posted February 21, 2012 Author Share Posted February 21, 2012 No i dont have a piggy back ECU, I'm just goin for a simple BPU set up that works and is more fit and forget. but in the meantime i want whats best for the car. Why do you ask if i have a piggy back ECU ? Quote Link to comment Share on other sites More sharing options...
SteveC Posted February 21, 2012 Share Posted February 21, 2012 The difference is that the HKS affects the Turbo Pressure Sensor voltage all the time (not ideal), whereas the Greddy only affects the TPS voltage when the turbo pressure exceeds around 1 Bar. This is not quite true. The HKS FCD changes the voltage at the certain voltage point onwards- so it does avoid changing off-boost map position. So this has the knockon effect of moving the map towards lean in order to allow for a mild boost upgrade. Lean is mean, especially if stock is rich for your setup. Greddy clamps voltage. Some say this is better, and it's probably true that it's safer because it's doesn't lean. Do you have a piggyback ECU? I think you may find that it is! Taken from here: The HKS unit reduces the signal coming from the turbo pressure sensor at a fixed percentage, which means that all the data coming from this sensor is corrupt. The Greddy BCC does not alter the signal significantly (I measured a 2.0 millivolt gain) and clamps the signal at a preset voltage that is user adjustable over a fairly wide range. Quote Link to comment Share on other sites More sharing options...
Yakky Posted February 21, 2012 Share Posted February 21, 2012 No i dont have a piggy back ECU, I'm just goin for a simple BPU set up that works and is more fit and forget. but in the meantime i want whats best for the car. Why do you ask if i have a piggy back ECU ? Because most have a built-in boost cut defender (volt clamp) anyway, like Emanage, AEM FIC, and some others. Quote Link to comment Share on other sites More sharing options...
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