KTMStrawn Posted March 14, 2014 Share Posted March 14, 2014 So from what I have been seeing on here it looks like most people just switch to single turbos. Im wondering if anyone has experience keeping the stock twin turbos and what size downpipe you are running. The stock output flange for the aristo is 2.5" and I have heard that if you go any bigger it will drop the backpressure and overboost. Has anyone experienced this? I would hate to have to run a 2.5" exhaust to be safe to only have to replace the whole exhaust a few years down the road. And if it is safe to run 3" I was thinking about removing the stock collector and making my own so that the exhaust would be a true 3" and not restrict down to 2.5". If anyone has any info I would greatly appreciate it. Thanks Quote Link to comment Share on other sites More sharing options...
m1ghtymaxXx Posted March 14, 2014 Share Posted March 14, 2014 Any time you free up a restriction you can overboost, the question is whether the wastegate can be adjusted to compensate, otherwise porting the wastegate passage would be the next step. Quote Link to comment Share on other sites More sharing options...
Avernier Posted March 15, 2014 Share Posted March 15, 2014 I ran 3" on stock twins. Fuel cut doesnt kick in until 14.7 psi, you can expect the boost to go from 10psi to 12-13 psi. Its fine. You're overthinking it. Quote Link to comment Share on other sites More sharing options...
KTMStrawn Posted March 17, 2014 Author Share Posted March 17, 2014 Gotcha. Cool lol I would rather over think it and make sure it's safe than go blindly and ruin something. Thanks Quote Link to comment Share on other sites More sharing options...
Avernier Posted March 17, 2014 Share Posted March 17, 2014 The ecu is smarter than you. It wont let you hurt the motor until you throw a piggy back on it. Quote Link to comment Share on other sites More sharing options...
rosaaen89 Posted November 13, 2014 Share Posted November 13, 2014 I have stock twins on mine and overboosted without a restrictor ring. I still need to get a fuel cut defencer for mine as well and swap the jdm twins with the usdm. Quote Link to comment Share on other sites More sharing options...
KTMStrawn Posted November 13, 2014 Author Share Posted November 13, 2014 I have stock twins on mine and overboosted without a restrictor ring. I still need to get a fuel cut defencer for mine as well and swap the jdm twins with the usdm. What kind of exhaust were you running? Quote Link to comment Share on other sites More sharing options...
rosaaen89 Posted November 17, 2014 Share Posted November 17, 2014 3" exhaust no cats. I installed a restrictor ring and doesn't over boost like before. But still seems like it don't pull as hard as it should. So I think it needs fuel cut defencer or boost cut controller. Quote Link to comment Share on other sites More sharing options...
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