rosaaen89 Posted January 19, 2015 Share Posted January 19, 2015 Hey everyone I have a 2jzgte datsun. I am curious to see if anyone knows, if I should use a fuel cut defencer or boost cut controller for it? Let me know if you have an idea any info would help. I don't know if one works better for a jdm motor or USDM. Quote Link to comment Share on other sites More sharing options...
pat1 Posted January 19, 2015 Share Posted January 19, 2015 Both are the samething just different names. A good way to blow up a motor. Quote Link to comment Share on other sites More sharing options...
rosaaen89 Posted January 19, 2015 Author Share Posted January 19, 2015 When the car boosts up it cuts out. I've read a bit installing the fuel cut defencer or boost cut controller, will keep it from doing so. Quote Link to comment Share on other sites More sharing options...
Ryan Merrill Posted January 20, 2015 Share Posted January 20, 2015 Never cut fuel on a booster car. Quote Link to comment Share on other sites More sharing options...
rosaaen89 Posted January 20, 2015 Author Share Posted January 20, 2015 The fcd keeps it from cutting out. Quote Link to comment Share on other sites More sharing options...
pat1 Posted January 20, 2015 Share Posted January 20, 2015 What both these modules do is trick the ecu. Ok let's say the boost cut is set @ 14 psi so anything you hit 14psi the ecu cuts the fuel and the power is cut. What these modules do is lie to the ecu. It tells the ecu that it's only 13 psi and then you can boost to the moon. But there is a problem. Now all the ecu sees is 13 psi and never adds any fuel or pulls timing to account to the extra boost. Guess what happens? That one time you pull next to your buddy's honda to run him and hit MAD boost and BOOM! Done. Quote Link to comment Share on other sites More sharing options...
rosaaen89 Posted January 20, 2015 Author Share Posted January 20, 2015 If i didn't have a restrictor ring installed the car when first boosting up it will cut off because it will overboost which will ruin the turbos. But with a restrictor ring installed it seems to only push like 4pounds or so. Many guys on the supra forums said to install a boost cut controller or fuel cut defencer so it will push 14-17 pounds. I don't know if I swap out the JDM turbos for the USDM ones if i will still need a restrictor ring installed or not. So I have been trying to browse around and find info on that as well since I have some USDM turbos laying around. Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted January 21, 2015 Share Posted January 21, 2015 (edited) So would you rather over-speed the turbos or lean out your engine? I don't know Supras but it sounds like a better solution is to defeat the boost cut in the ECU, and don't mask the boost signal so the ECU can continue to fuel the engine appropriately. Edited January 21, 2015 by SleeperZ Quote Link to comment Share on other sites More sharing options...
rosaaen89 Posted January 21, 2015 Author Share Posted January 21, 2015 With a fcd or bcc it won't over boost the turbos. I've read that it limits to around 1 bar still. Quote Link to comment Share on other sites More sharing options...
johnc Posted January 22, 2015 Share Posted January 22, 2015 Why not reflash the ECU or install an aftermarket ECU? Quote Link to comment Share on other sites More sharing options...
rosaaen89 Posted January 22, 2015 Author Share Posted January 22, 2015 Probably could send it somewhere and have ecu reflashed but i'm not sure where. A lot of guys on supra forums run the boost cut controller and say it don't have any problems. Quote Link to comment Share on other sites More sharing options...
johnc Posted January 22, 2015 Share Posted January 22, 2015 It sounds like you've made up your mind and just want validation from us. Quote Link to comment Share on other sites More sharing options...
seattlejester Posted January 23, 2015 Share Posted January 23, 2015 Both are old school bandaids. Fuel cut defender stops the car from cutting fuel at a certain boost level and a boost control solenoid allows you to run more boost. You would need both for it to "work," a boost control solenoid will keep the waste gate closed and allow you to build more boost, the fuel cut defender will allow the stock ECU to keep adding fuel instead of cutting out, but as everyone is saying it really isn't the best idea. These are older work arounds when aftermarket ECU and reflashes/programmable things were much more cost prohibitive, an aftermarket ECU even a megasquirt would be able to read the additional boost and add fuel and timing changes to compensate. If you were adamant on going the old school route, you might as well upsize the injectors, add a bigger throttle body idle circuit and all the other work arounds people used to run. Quote Link to comment Share on other sites More sharing options...
rosaaen89 Posted January 23, 2015 Author Share Posted January 23, 2015 Where would one send there ecu to get re flashed or programmed? Quote Link to comment Share on other sites More sharing options...
seattlejester Posted January 23, 2015 Share Posted January 23, 2015 Look around, some of the japanese companies used to flash ECU's (Tom's, Mine's come to mind), but I think you can buy a megasquirt for the prices they wanted if they still offer the service. It would be advisable to look into a fully programmable ECU (megasquirt, AEM, etc etc). Quote Link to comment Share on other sites More sharing options...
rosaaen89 Posted January 24, 2015 Author Share Posted January 24, 2015 I seen a few AEM v1 for 700-800. Also saw a mines ecu for 700 on ebay as well. Quote Link to comment Share on other sites More sharing options...
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