Armin Posted May 18, 2007 Share Posted May 18, 2007 I got one now and i havent installed it yet with the dp and frontpipe, but ive read different stories about this mod, what performance advantages have you seen? im thinking of throwing this to the trashcan because it doesent seem smart at all installing a 2" restrictor on an engine who should develope say 400hp. any ideas about sorting this wastegate problem otherwise? and can someone explain this wastegate problem more accurate, i havent really figured out the problem yet, the explenations ive found here by searching are very thin. Link to comment Share on other sites More sharing options...
Nic Posted May 18, 2007 Share Posted May 18, 2007 First of all is yours a J-spec or European spec Supra? If it is a European spec, you do not need to install a restrictor ring as the Euro turbos have a bigger wastegate that is able to control the boost when the cats are removed. The watsegate on the J-spec turbos is smaller and cannot flow enough exhaust gasses through it to control the boost pressure when the cats are removed. Without a restrictor ring fitted the J-spec turbos will over spool and boost will go skyhigh; >1.5+bar. The ceramic turbos are not able to cope with these levels of boost and will self destruct very quickly. To control the max boost of the j-spec turbos, it is neccessary to fit a restriction in the exhaust to limit the gas flow slightly and subsequently prevent the turbos from over spooling. It not an ideal way, but is the simplest and cheapest, ideally you'd want a bigger watsegate to control the boost, but there is just not enough meat on the J-spec turbos to be able to open the wastegate up wide enough to do this. Link to comment Share on other sites More sharing options...
Armin Posted May 18, 2007 Author Share Posted May 18, 2007 thanks for the explenation, i have a jspec supra and the parts are coming in but im not sure if i want to go the "restrictor way" Bud it seems that the only way is to swich to eurospec turbos and that is nothin i´m interested in. Going singel´in a couple of months. has anyone done any 1/4 mile times with bpu japspec? any twelve second times? Link to comment Share on other sites More sharing options...
Nic Posted May 18, 2007 Share Posted May 18, 2007 thanks for the explenation, i have a jspec supra and the parts are coming in but im not sure if i want to go the "restrictor way" Bud it seems that the only way is to swich to eurospec turbos and that is nothin i´m interested in. Going singel´in a couple of months. has anyone done any 1/4 mile times with bpu japspec? any twelve second times? If you are removing the cats, then you'll have to use the restrictor ring (or your right foot) to limit the boost. See here http://mkivsupra.net/vbb/showthread.php?t=29073 Link to comment Share on other sites More sharing options...
letmeshowyou Posted May 18, 2007 Share Posted May 18, 2007 12 second times in a japspec BPU isn't a problem what's your objection to the restrictor now you know why it's there? Link to comment Share on other sites More sharing options...
Thorin Posted May 18, 2007 Share Posted May 18, 2007 Getting rid of both cats, and without a restrictor ring your turbo's will grenade themselves pretty quickly. There's also the fact that the j-spec injectors are already on the limit at 1.2 bar let alone 1.5+... ...but go ahead and don't bother fitting one if you wish. Link to comment Share on other sites More sharing options...
Armin Posted May 18, 2007 Author Share Posted May 18, 2007 Hehe i just think that tuning a car by mounting on straw sized restrictions is wrong. But if it works then i guess that its fine. The goal for this year is to run a twelve sec run with my 6spd japspec that i bought in uk earlier this spring. Going singel turbo in -08 season Link to comment Share on other sites More sharing options...
Thorin Posted May 18, 2007 Share Posted May 18, 2007 A few people on this forum have done 11's with stock turbo's Link to comment Share on other sites More sharing options...
Armin Posted May 18, 2007 Author Share Posted May 18, 2007 A few people on this forum have done 11's with stock turbo's thats freakin inpressive did they have the rr to? or switched turbos to euro? Link to comment Share on other sites More sharing options...
Thorin Posted May 18, 2007 Share Posted May 18, 2007 thats freakin inpressive did they have the rr to? or switched turbos to euro? They had drag radials! It's all about traction! Link to comment Share on other sites More sharing options...
Jake Posted May 18, 2007 Share Posted May 18, 2007 They had high stall TCs! It's all about the launch! Link to comment Share on other sites More sharing options...
Thorin Posted May 18, 2007 Share Posted May 18, 2007 They had high stall TCs! It's all about the launch! Pffft, buy some drag radials for me and I'll do 11's! Link to comment Share on other sites More sharing options...
letmeshowyou Posted May 19, 2007 Share Posted May 19, 2007 yeah I reckon I could do an 11 on some drag radials too (without High stall) - wouldn't do my gearbox alot of good though! Link to comment Share on other sites More sharing options...
Recommended Posts
Please sign in to comment
You will be able to leave a comment after signing in
Sign In Now