ashbuster Posted February 3, 2012 Share Posted February 3, 2012 in a jap spec wheres the best place to put the restrictor ring? inbetween the 2 decats or after the 2nd decat? thanks guys Quote Link to comment Share on other sites More sharing options...
tony tt Posted February 3, 2012 Share Posted February 3, 2012 Inbetween the two Decats bud. Quote Link to comment Share on other sites More sharing options...
dude Posted February 3, 2012 Share Posted February 3, 2012 Exhaust !!!!! Quote Link to comment Share on other sites More sharing options...
ashbuster Posted February 3, 2012 Author Share Posted February 3, 2012 nice 1 Quote Link to comment Share on other sites More sharing options...
Kirk Posted February 3, 2012 Share Posted February 3, 2012 Curious as to why people place them there. I've always put them between the second decat and the cat back Quote Link to comment Share on other sites More sharing options...
dude Posted February 3, 2012 Share Posted February 3, 2012 nice 1 Sorry could not resist !!! Quote Link to comment Share on other sites More sharing options...
tony tt Posted February 3, 2012 Share Posted February 3, 2012 Curious as to why people place them there. I've always put them between the second decat and the cat back Will it spool quicker if the rr is further back? I though between the Decats was the best place to allow safer back pressure Quote Link to comment Share on other sites More sharing options...
Kirk Posted February 3, 2012 Share Posted February 3, 2012 I dont think it makes any odds tbh. Either way they still work like every other Supra with decats so who knows Quote Link to comment Share on other sites More sharing options...
Dim Sum Posted February 3, 2012 Share Posted February 3, 2012 i know people who put it between exhaust and mid pipe. Or get a UK engine then you wont need it Quote Link to comment Share on other sites More sharing options...
Graham1984 Posted February 3, 2012 Share Posted February 3, 2012 I was going to go with glovebox. Quote Link to comment Share on other sites More sharing options...
fastcar Posted February 3, 2012 Share Posted February 3, 2012 I dont use one it started to stall the compressor at around 5k rpm forcing the car to hold back. Had mine between the 1st and 2nd cat Quote Link to comment Share on other sites More sharing options...
ashbuster Posted February 4, 2012 Author Share Posted February 4, 2012 I dont use one it started to stall the compressor at around 5k rpm forcing the car to hold back. Had mine between the 1st and 2nd cat any reason for this? i only have a manual ball and spring controller to fit at the moment so i wanted to put the ring in, and lol @dude Quote Link to comment Share on other sites More sharing options...
fastcar Posted February 5, 2012 Share Posted February 5, 2012 any reason for this? i only have a manual ball and spring controller to fit at the moment so i wanted to put the ring in, and lol @dude I'm not sure why it did it to be honest. My guess is it just made the system to restrictive. The RR would hold boost at 1bar with the EBC turned off. With it turned in it would hit 1.2bar but when it got to about 5k rpm it would just hold back. So took it out and turned the EBC off. It hit just under 1.2 in 3rd about 1.22 in 4th then in 5th and 6th about 1.27 which I don't mind because I don't hammer it all the time in the top gears but it dosent hold back anymore. An RR is an exact science some cars need them and some don't and other just need a slightly bigger hole made in them. It all depends on the system you have really Quote Link to comment Share on other sites More sharing options...
Scott Posted February 5, 2012 Share Posted February 5, 2012 Makes no odds where you put the restriction, as long as it's in the exhaust fow (As Dude says). Quote Link to comment Share on other sites More sharing options...
Samurai 20V Posted February 5, 2012 Share Posted February 5, 2012 Since we talking restriction in the exhaust, do the silencers in the tailpipe cause much restriction? I stuck my one back on the car as it was disturbing my neighbours, it quietened it down a hell of lot so surely it must be restrictive? Quote Link to comment Share on other sites More sharing options...
Scott Posted February 5, 2012 Share Posted February 5, 2012 Since we talking restriction in the exhaust, do the silencers in the tailpipe cause much restriction? I stuck my one back on the car as it was disturbing my neighbours, it quietened it down a hell of lot so surely it must be restrictive? Yes, the more silencers the more restriction you add. Also the diameter of the exhaust itself makes a difference. The stock exhaust system is very restrictive. One thing to make note of is how much boost your car makes without a controller in place. You want it to be just above 1.0bar as otherwise you will have too much of a restriction on the system causing higher than normal EGTs. Quote Link to comment Share on other sites More sharing options...
Samurai 20V Posted February 5, 2012 Share Posted February 5, 2012 Yes, the more silencers the more restriction you add. Also the diameter of the exhaust itself makes a difference. The stock exhaust system is very restrictive. One thing to make note of is how much boost your car makes without a controller in place. You want it to be just above 1.0bar as otherwise you will have too much of a restriction on the system causing higher than normal EGTs. Will check it out.. I wonder I could lose the RR and just use the silencer?? I came across this advert on Yahoo, it is a replacement actuator that is supposed to handle 1-2kg of boost (not sure what that is in bar).. I take it it has a stiffer spring, I reckon it would not eliminate the need for a RR? http://page9.auctions.yahoo.co.jp/jp/auction/k130735183 Quote Link to comment Share on other sites More sharing options...
Scott Posted February 5, 2012 Share Posted February 5, 2012 Will check it out.. I wonder I could lose the RR and just use the silencer?? I came across this advert on Yahoo, it is a replacement actuator that is supposed to handle 1-2kg of boost (not sure what that is in bar).. I take it it has a stiffer spring, I reckon it would not eliminate the need for a RR? http://page9.auctions.yahoo.co.jp/jp/auction/k130735183 It's not the actuator that's the issue. It's the size of the wastegate hole. It just isn't big enough to allow enough of the exhaust gas to push through. Quote Link to comment Share on other sites More sharing options...
Bossco Posted February 5, 2012 Share Posted February 5, 2012 I read on here ( a few years back) that the RR sould be placed as far back in the exhaust as possibe. If it's to close to the front or the down pipe that the gases are spinning around in the pipe and the RR cant do it's job properly. I'll be honset, I've had mine at the front and the back and didnt see any difference. Quote Link to comment Share on other sites More sharing options...
RZtwin Posted February 6, 2012 Share Posted February 6, 2012 I don't want to raise my EGT's on my J-Spec TT cuz I don't have a gauge in place just yet. So let me get this straight. After I do a double decat, Nur Spec R and rr in place I should be around 1.0BAR right? Also what does the added rr do to my EGT's. I guess my question is: Is the stock exhaust more restrictive then adding and 1BAR restrictor ring? My goal is to hit 1BAR with Decat the use an EBC to raise it to 1.2 for spirited occasions Yes, the more silencers the more restriction you add. Also the diameter of the exhaust itself makes a difference. The stock exhaust system is very restrictive. One thing to make note of is how much boost your car makes without a controller in place. You want it to be just above 1.0bar as otherwise you will have too much of a restriction on the system causing higher than normal EGTs. Quote Link to comment Share on other sites More sharing options...
tony tt Posted February 6, 2012 Share Posted February 6, 2012 I don't want to raise my EGT's on my J-Spec TT cuz I don't have a gauge in place just yet. So let me get this straight. After I do a double decat, Nur Spec R and rr in place I should be around 1.0BAR right? Also what does the added rr do to my EGT's. I guess my question is: Is the stock exhaust more restrictive then adding and 1BAR restrictor ring? My goal is to hit 1BAR with Decat the use an EBC to raise it to 1.2 for spirited occasions The rr ring won't make much difference to you're egt's it will just provide enough back pressure to stop you're j spec tubs spooling to about 1.6bar and failure. The stock exhaust is more restrictive yes. Quote Link to comment Share on other sites More sharing options...
Scott Posted February 6, 2012 Share Posted February 6, 2012 The rr ring won't make much difference to you're egt's it will just provide enough back pressure to stop you're j spec tubs spooling to about 1.6bar and failure. The stock exhaust is more restrictive yes. Any restriction in the system will raise the EGTs unfortunately. The key is keeping the restriction to the minimum required to keep boost levels safe. Before I installed my RR I would see around 800-850 degrees f when motorway cruising around, once i installed it I saw anything from 950-1000 degrees f when motorway cruising. This was a bit high and without boost control I wasn't getting above 0.9bar. I ground out the RR so that I would hit a max of 1.1bar and my EGTs dropped to 900-950 on motorway cruising. I would always recommend aiming for 1.0-1.1bar with no boost control (1.0 in the lower gears, 1.1 in the higher) as this keeps the EGTs as low as they can be when going for 1.2bar. Quote Link to comment Share on other sites More sharing options...
RZtwin Posted February 11, 2012 Share Posted February 11, 2012 What did you mean by "ground out"? Do you mean grind out the rr?? Also How do I "aim for exactly 1.0bar ? Any restriction in the system will raise the EGTs unfortunately. The key is keeping the restriction to the minimum required to keep boost levels safe. Before I installed my RR I would see around 800-850 degrees f when motorway cruising around, once i installed it I saw anything from 950-1000 degrees f when motorway cruising. This was a bit high and without boost control I wasn't getting above 0.9bar. I ground out the RR so that I would hit a max of 1.1bar and my EGTs dropped to 900-950 on motorway cruising. I would always recommend aiming for 1.0-1.1bar with no boost control (1.0 in the lower gears, 1.1 in the higher) as this keeps the EGTs as low as they can be when going for 1.2bar. Quote Link to comment Share on other sites More sharing options...
Rob W Posted February 11, 2012 Share Posted February 11, 2012 Yea grind out the rr. Basically you have to take it off, grind a little out of the rr then back onto the car to see what your getting. Repeat till you have about 1bar mate. Quote Link to comment Share on other sites More sharing options...
Scott Posted February 11, 2012 Share Posted February 11, 2012 Exactly that ^^ Quote Link to comment Share on other sites More sharing options...
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