The Raven Posted September 15, 2015 Share Posted September 15, 2015 Hi guys brought a RR and its measuring 60mm is this acceptable or should it be smaller? Quote Link to comment Share on other sites More sharing options...
fastcar Posted September 15, 2015 Share Posted September 15, 2015 On healthy turbos that should see you boosting about 1.25-1.30 bar. Depends on how free flowing the rest of your exhaust is. I run a 60mm RR with 3inch decats going to a 4inch exhaust and see a little over 1.30bar in higher gears Quote Link to comment Share on other sites More sharing options...
Ric Posted September 15, 2015 Share Posted September 15, 2015 isn't it usually best to install a RR which gives you around 1bar then raise with a controller? a more safer option? Quote Link to comment Share on other sites More sharing options...
The Raven Posted September 15, 2015 Author Share Posted September 15, 2015 This is what i want but i dont know what size a 1bar and a 1.2 bar ring is? Quote Link to comment Share on other sites More sharing options...
shaky Posted September 15, 2015 Share Posted September 15, 2015 2 inch should be 1 bar , it is on mine with a 3 inch exhaust. Quote Link to comment Share on other sites More sharing options...
safcdixon Posted September 15, 2015 Share Posted September 15, 2015 isn't it usually best to install a RR which gives you around 1bar then raise with a controller? a more safer option? You get higher egt's doing it that way as its a higher restriction, mines 64mm RR runs 1.35, 3" decats and 4" single box exhaust, no boost controller needed Quote Link to comment Share on other sites More sharing options...
Ric Posted September 15, 2015 Share Posted September 15, 2015 You get higher egt's doing it that way as its a higher restriction, mines 64mm RR runs 1.35, 3" decats and 4" single box exhaust, no boost controller needed But 1.34 is too much? thats pushing the limits of the stock injectors, nevermind the ceramic turbos is it not? I know it's not ideal, but it's the usual way of doing BPU as it gives greater control over the boost, and won't overboost if done right. Im also most certain that the EGT's will not be drastically different between the two? Quote Link to comment Share on other sites More sharing options...
fastcar Posted September 15, 2015 Share Posted September 15, 2015 If you want 1bar then the size RR is 2inch. You can get them from whiffbitz Quote Link to comment Share on other sites More sharing options...
safcdixon Posted September 15, 2015 Share Posted September 15, 2015 But 1.34 is too much? thats pushing the limits of the stock injectors, nevermind the ceramic turbos is it not? I know it's not ideal, but it's the usual way of doing BPU as it gives greater control over the boost, and won't overboost if done right. Im also most certain that the EGT's will not be drastically different between the two? 1.4 what has been proven by a couple of members i know to be a safe limit, ive been running 1.35 since april, (was running 1bar for 3yrs prior) and i kick its head in everywhere, done quite alot of miles in that time, its still perfect as it proved on the dyno on saturday, its on stock original 22yr old jspec turbos and stock 440cc injectors fueling is bang on the egts are obviously higher when running a smaller ring, it is like blowing through a straw compared to a hosepipe, the size might not sound that much in terms of inches/mm but the overall space opened is significant, my RR is 2.5" compared to 2" overboosting means more power = more speed Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted September 16, 2015 Share Posted September 16, 2015 1.4 bar, even if the stock turbos will produce that, will mean overspeeding and terrible turbo efficiency, they will be right off the efficiency map, thrashing the air and heating it significantly. 1.2 bar is definitely the safe limit in my opinion. Quote Link to comment Share on other sites More sharing options...
Gaz6002 Posted September 16, 2015 Share Posted September 16, 2015 1.4 bar, even if the stock turbos will produce that, will mean overspeeding and terrible turbo efficiency, they will be right off the efficiency map, thrashing the air and heating it significantly. 1.2 bar is definitely the safe limit in my opinion. But 1.4 is more, so it must be better! Sounds better down the pub, anyway. Quote Link to comment Share on other sites More sharing options...
Burna Posted September 16, 2015 Share Posted September 16, 2015 Or you could just run no restrictor ring at all like me But please please don't do that unless you are UK Quote Link to comment Share on other sites More sharing options...
JasonR24 Posted September 16, 2015 Share Posted September 16, 2015 So the ecu won't stop boost at all. Say if you put a 2.5 RR in with no boost controller it will still always go to 1.4 bar? When is fuel cut? Quote Link to comment Share on other sites More sharing options...
fastcar Posted September 16, 2015 Share Posted September 16, 2015 So the ecu won't stop boost at all. Say if you put a 2.5 RR in with no boost controller it will still always go to 1.4 bar? When is fuel cut? No if you haven't got a fuel cut defender or a piggyback/standalone ecu you will hit fuel cut at 1bar Quote Link to comment Share on other sites More sharing options...
CraigMoSupraRSP Posted September 16, 2015 Share Posted September 16, 2015 ....and it's not a nice feeling hitting fuel cut! Quote Link to comment Share on other sites More sharing options...
JasonR24 Posted September 16, 2015 Share Posted September 16, 2015 Ok so I've got a 1.2 bar restrictor ring in place on my VVTI. Why doesn't it try boosting to 1.2 bar and then hit fuel cut at 1 bar? I'm totally confused Quote Link to comment Share on other sites More sharing options...
Ric Posted September 16, 2015 Share Posted September 16, 2015 A supra will only boost to 1.2bar if the cats are taken out. 3seconds at 1+bar will hit fuel cut, you need to fit a FCD to stop this. with RR only, it's a very fine art to take enough metal away to get it exactly to 1.2 bar, this will change with air tempreture also, which is why its usually said best to fit a 1bar RR and raise with a controller. As you can only raise boost with a controller, not lower it. If you ran a supra with no restrictor ring and no cats, it would overboost, sometimes to 2bar, bye bye turbos. Quote Link to comment Share on other sites More sharing options...
JasonR24 Posted September 16, 2015 Share Posted September 16, 2015 This is what I'm saying. I have a double decat on the exhaust, it's an RSR one. It has a 1.2 bar restrictor ring... Therefore shouldn't it boost to 1 bar and hit the fuel cut as it can go to 1.2 bar? I don't know if it's because it's vvti and has a MAF that it stops it hitting the cut but seems odd Quote Link to comment Share on other sites More sharing options...
safcdixon Posted September 16, 2015 Share Posted September 16, 2015 This is what I'm saying. I have a double decat on the exhaust, it's an RSR one. It has a 1.2 bar restrictor ring... Therefore shouldn't it boost to 1 bar and hit the fuel cut as it can go to 1.2 bar? I don't know if it's because it's vvti and has a MAF that it stops it hitting the cut but seems odd Do you have an fcd? Quote Link to comment Share on other sites More sharing options...
JasonR24 Posted September 16, 2015 Share Posted September 16, 2015 Do you have an fcd? Nope Quote Link to comment Share on other sites More sharing options...
Ric Posted September 16, 2015 Share Posted September 16, 2015 Depends how restrictive the RSR is, i seem to recall they are. Dont you have a boost gauge? seems silly not too if you have double decat? If the exhaust is restrictive it would have the same effect as having the cats in, hence no increase in boost. Do you have a Mines or Blitz ecu? those have built in fcd's Quote Link to comment Share on other sites More sharing options...
fastcar Posted September 16, 2015 Share Posted September 16, 2015 Does it boost past 1bar? Or just up to it? Quote Link to comment Share on other sites More sharing options...
JasonR24 Posted September 16, 2015 Share Posted September 16, 2015 Well it's Abzs old car. The weird part is it has no boost controller or FCD or boost gauge for that matter but it's definitely not hitting fuel cut and it has a double decat and 1.2 bar restrictor ring. Quote Link to comment Share on other sites More sharing options...
Axl Posted September 16, 2015 Share Posted September 16, 2015 Hitting fuel cut sucks Quote Link to comment Share on other sites More sharing options...
fastcar Posted September 16, 2015 Share Posted September 16, 2015 Well it's Abzs old car. The weird part is it has no boost controller or FCD or boost gauge for that matter but it's definitely not hitting fuel cut and it has a double decat and 1.2 bar restrictor ring. What size RR is it? Is it a 2inch? If it is you are most likely only boosting to just under 1bar - - - Updated - - - Hitting fuel cut sucks Shhh you:p Quote Link to comment Share on other sites More sharing options...
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