ATB Posted August 9, 2014 Share Posted August 9, 2014 Hey. I have a USDM 93 TT and I have done the double decat just recently. I have been reading and studying this topic several times: http://www.mkivsupra.net/vbb/showthread.php?94705-BPU-(Basic-Performance-Upgrade) I saw that I should have something like 0.85 bar after the decat, but I did hit boost cut once last week which I presume is from hitting 1 bar or more. Is this possible on a stock US spec? (Engine light flash and loss of power). I am putting the stock exhaust back on after the car goes in for winter storage as I have a MOT in the spring again. But after that I am doing the decat and HKS exhaust again, am I safe doing only the decat or should I change the plugs and get a fcd? I am not looking for more power I just want the added sound. Quote Link to comment Share on other sites More sharing options...
Dnk Posted August 9, 2014 Share Posted August 9, 2014 I'd take a guess and think you could well need a restrictor ring in the exhaust to hold the boost down, then fit an FCD along with a boost controller so you can then raise the boost up to 1.2 bar Quote Link to comment Share on other sites More sharing options...
Marcus GTE Posted August 9, 2014 Share Posted August 9, 2014 I have nearly the same spec as you at the moment except with a HKS fcd and platinum plugs. I've never hit fuel cut. Was it cold where you were at the time? As temp can effect things. Quote Link to comment Share on other sites More sharing options...
Dnk Posted August 9, 2014 Share Posted August 9, 2014 (edited) I have nearly the same spec as you at the moment except with a HKS fcd and platinum plugs. I've never hit fuel cut. Was it cold where you were at the time? As temp can effect things. If you have an FCD you wont hit fuel cut but you could be over boosting if it works the same as a j spec set up. Do you have a boost gauge showing what boost its making. Edited August 9, 2014 by Dnk (see edit history) Quote Link to comment Share on other sites More sharing options...
Marcus GTE Posted August 9, 2014 Share Posted August 9, 2014 If you have an FCD you wont hit fuel cut but you could be over boosting if it works the same as a j spec set up. Do you have a boost gauge showing what boost its making. Was just meaning a fcd might sort out the issue. The waste gate is bigger on export models hence why a ebc is needed to up the boost as it won't reach 1.2 bar like the jspec does with the cats out. It also doesn't need a restricor ring, that's just for Jspecs I believe. I don't know what I'm talking about, but for me fitting a fcd would probbably be the next logical step? Quote Link to comment Share on other sites More sharing options...
Dnk Posted August 9, 2014 Share Posted August 9, 2014 So its the same as a uk spec then, no restrictor ring needed just fcd and ebc if you want 1.2 bar Quote Link to comment Share on other sites More sharing options...
ATB Posted August 9, 2014 Author Share Posted August 9, 2014 My car is imported from USA so it has to be a export car so it should have the steel turbos. It was like 20 'C and it was a long third gear pull. and before shifting it cut out. What I thought was my next logical step was new plugs and fcd. But I got worried as the engine light flashed and it cut out. I do not have a boost gauge atm Quote Link to comment Share on other sites More sharing options...
Dnk Posted August 9, 2014 Share Posted August 9, 2014 (edited) I'd want to know once you fit an FCD what the boost is going too just to be safe. Think i'd look on the US forums as the info should be on there Edited August 9, 2014 by Dnk (see edit history) Quote Link to comment Share on other sites More sharing options...
ATB Posted August 9, 2014 Author Share Posted August 9, 2014 Checked the code I got and it was 34, so it was for sure a boost cut. Quote Link to comment Share on other sites More sharing options...
Marcus GTE Posted August 9, 2014 Share Posted August 9, 2014 Get a fcd fitted and I'm sure you will be fine. Honestly. If you plan to go full bpu some supporting mods will be needed, but they are all covered by clicking bpu Quote Link to comment Share on other sites More sharing options...
shaz2010 Posted August 10, 2014 Share Posted August 10, 2014 I had the same issue with mine, I was hitting fuel cut just with the double de cat and cat back exhaust. Make sure you are running a cooler plug and fit a FCD this will fix it. Uk/USDM are the same I some times hit 1.1 bar at high speed runs. No BC fitted. Quote Link to comment Share on other sites More sharing options...
Dnk Posted August 10, 2014 Share Posted August 10, 2014 I had the same issue with mine, I was hitting fuel cut just with the double de cat and cat back exhaust. Make sure you are running a cooler plug and fit a FCD this will fix it. Uk/USDM are the same I some times hit 1.1 bar at high speed runs. No BC fitted. Strange i never hit fuel cut on my car when it was de catted and with Super Drager exhaust, good to know your only getting to 1.1 bar, much over 1.3 i think and your just creating heat on stock turbo's Quote Link to comment Share on other sites More sharing options...
shaz2010 Posted August 10, 2014 Share Posted August 10, 2014 Strange i never hit fuel cut on my car when it was de catted and with Super Drager exhaust, good to know your only getting to 1.1 bar, much over 1.3 i think and your just creating heat on stock turbo's I know dunk I didn't understand how I was but I did. The thing is I checked the boost before and after the decats with the same boost gauge and I was getting the correct boost readings. But recently I've hit over 1bar like I said. From previous posts I thought the uk spec would not go over 1 bar :-/ Quote Link to comment Share on other sites More sharing options...
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