RB-GTE Posted July 10, 2012 Share Posted July 10, 2012 I don't plan on going single turbo will just enjoy BPU on my Supra up to the safe limit (1.2) I'm just wondering have people been running BPU setups for long and the twins are still healthy? Quote Link to comment Share on other sites More sharing options...
tooquicktostop Posted July 10, 2012 Share Posted July 10, 2012 1.2 is the top limit, the 440cc injectors will be maxed out at this level Quote Link to comment Share on other sites More sharing options...
Gaz6002 Posted July 10, 2012 Share Posted July 10, 2012 Mine lasted around 4,000 miles at 1.2 bar. Quote Link to comment Share on other sites More sharing options...
johnny g Posted July 10, 2012 Share Posted July 10, 2012 Mine lasted around 4,000 miles at 1.2 bar. Same here, give or take a few miles - and they only came off for more power. Quote Link to comment Share on other sites More sharing options...
RB-GTE Posted July 10, 2012 Author Share Posted July 10, 2012 Yeah I'm just trying to figure out how long they have lasted for people If they don't go out on me I plan on keeping them Quote Link to comment Share on other sites More sharing options...
NathWraith Posted July 10, 2012 Share Posted July 10, 2012 How about on uk spec injectors? Quote Link to comment Share on other sites More sharing options...
Shane Posted July 10, 2012 Share Posted July 10, 2012 1.2 is the top limit, the 440cc injectors will be maxed out at this level You can get round this to a dgree though by upping the fuel pressure cant you? Andy Blythe (I think) did a write up of his results experimenting with upping the fuel pressure and iirc the 440s responded well. But back on subject re the life of the turbos, I am running just below 1.2 and have noticed that I am getting traces of oil in my intake now, so I guess thats a sign that the seals are starting to fail? Quote Link to comment Share on other sites More sharing options...
Dnk Posted July 10, 2012 Share Posted July 10, 2012 I've ran 1.2 bar on my uk spec for years but as to how long the turbo's have actually been at 1.2 bar is anyones guess. Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted July 10, 2012 Share Posted July 10, 2012 How long is a piece of string? How well has your car been looked after in the past? Lots of variables dictate turbo life, and shattering of the ceramic turbines is not unheard of if the oil seals dont give up. Quote Link to comment Share on other sites More sharing options...
bodilx6 Posted July 10, 2012 Share Posted July 10, 2012 Mine (j-spec) has lasted for 6+ years now. Soon 7. 50.000+ miles. Two yearly trips to The Ring through Germany not holding back on chasing top speed. A trackday or two on top of this each year. The car has not skipped a beat. Still pulls strong. I see 1 bar in hot weather and 1.2 in cold (seen 1.3 once or twice, but avoid that) From what I have heard, it is quite common for the tubbies to last for years if you use common sense. However, if people are looking to go single at some point, I guess they don't baby them too much.. Quote Link to comment Share on other sites More sharing options...
Shane Posted July 10, 2012 Share Posted July 10, 2012 (edited) I've ran 1.2 bar on my uk spec for years but as to how long the turbo's have actually been at 1.2 bar is anyones guess. And that Dunk is a very valid point. Just because you have the max boost set to 1.2, doesn't mean that you are going to be sitting at that constantly, its just there when you need it and in day to day use how often is that with our roads. Edited July 10, 2012 by Shane typo (see edit history) Quote Link to comment Share on other sites More sharing options...
spikedjack Posted July 10, 2012 Share Posted July 10, 2012 even when out for a spirited drive, 1.2 bar isnt seen for a huge amount of time, i mean if you can lay the full 1.2 bar down at WOT round bends then you're a much beter driver than me. As above though, they'll last someone who uses their car daily and only drives it spiritedly a lot longer than someone that simply uses their car for thrash and track seeing the 1.2bar more often Quote Link to comment Share on other sites More sharing options...
black_widow87 Posted July 10, 2012 Share Posted July 10, 2012 I've ran 1.2 bar on my uk spec for years but as to how long the turbo's have actually been at 1.2 bar is anyones guess. But wont the uk spec turbos handle 1.2bar better than ceramic jspecs's? Quote Link to comment Share on other sites More sharing options...
thedirtycat Posted July 10, 2012 Share Posted July 10, 2012 But wont the uk spec turbos handle 1.2bar better than ceramic jspecs's? Yes because they are steel so they say 1.4 bar is safe. Then I guess with the extra boost then other things are under more stress though. Quote Link to comment Share on other sites More sharing options...
Thorin Posted July 10, 2012 Share Posted July 10, 2012 People who say 1.4bar is safe on UK specs are wrong. Quote Link to comment Share on other sites More sharing options...
thedirtycat Posted July 10, 2012 Share Posted July 10, 2012 People who say 1.4bar is safe on UK specs are wrong. Can't you run slightly higher boost because they are steel and they wont shatter like the ceramic blades ? Quote Link to comment Share on other sites More sharing options...
Gaz6002 Posted July 10, 2012 Share Posted July 10, 2012 If I had another Supra I'd make sure I wasn't running close to the 'limit'. A bit of headroom is only going to be a good thing when it comes to turbocharged engines. Quote Link to comment Share on other sites More sharing options...
Dnk Posted July 10, 2012 Share Posted July 10, 2012 Back on topic, the question is pretty much unanswerable due to there being so many variants and i'm not including the UK twin set up. Quote Link to comment Share on other sites More sharing options...
Thorin Posted July 10, 2012 Share Posted July 10, 2012 Can't you run slightly higher boost because they are steel and they wont shatter like the ceramic blades ? They won't shatter, but they can still fail. At 1.4 they're outside their efficiency range and just generating more heat. IIRC Ian C did some testing years back and his car actually made less power at 1.4 bar than they did at 1.3. Quote Link to comment Share on other sites More sharing options...
Fitz Posted July 10, 2012 Share Posted July 10, 2012 As I know nothing about this whole turbo setup and the constraints along with it, could you not just uprate the injectors to a higher flow? Ive seen members mention that the 440cc injectors will be maxed out so could you not just put (say) 600cc in and have a RR in place? Apologies if that seems extremely silly but again, all I know is the GE engine. Quote Link to comment Share on other sites More sharing options...
zorglub Posted July 10, 2012 Share Posted July 10, 2012 drive with 1.2b on my French Supra (same spec as the uk spec, steel turbos and 550cc) for 5 years and 30 000km now without any issue Quote Link to comment Share on other sites More sharing options...
Nic Posted July 10, 2012 Share Posted July 10, 2012 But wont the uk spec turbos handle 1.2bar better than ceramic jspecs's? Bearing/oil seal wear seems to be more common with the UK spec turbos and the J-spec ceramic turbine wheels can shatter, running either turbos above the stock boost pressure will reduce their life. As Thorin says 1.2bar is accepted to be the maximum 'safe' boost pressure for both UK and J-spec turbos, above this and they start to generate high intake temperatures. Quote Link to comment Share on other sites More sharing options...
Nic Posted July 10, 2012 Share Posted July 10, 2012 As I know nothing about this whole turbo setup and the constraints along with it, could you not just uprate the injectors to a higher flow? Ive seen members mention that the 440cc injectors will be maxed out so could you not just put (say) 600cc in and have a RR in place? Apologies if that seems extremely silly but again, all I know is the GE engine. The stock J-spec 2JZ-GTE ECU is mapped to control the 440cc injectors, yes you can fit higher flowing injectors but you would also need some way of controlling them with either a standalone or piggyback ECU. Quote Link to comment Share on other sites More sharing options...
ubersonic Posted July 10, 2012 Share Posted July 10, 2012 Can't you run slightly higher boost because they are steel and they wont shatter like the ceramic blades ? Look at it from this pov, the UK turbos internals are essentially steel versions of the ones from a 1JZ's turbos, so at 1.2 bar they are already beyond what would be considered safe on a ceramic CT12 (1.0 bar) so there's your ability to run higher boost in effect. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted July 10, 2012 Share Posted July 10, 2012 If you are upping the boost on a tired old 100,000 mile plus engine and turbos you are just sailing very close to the wind, if you up the boost on a properly rebuilt engine and new (not rebuilt) genuine turbos, you are more likely to enjoy a long and reliable relationship In my experience Jap spec turbos last far longer than UK spec ones without smoking or blowing up, at stock or modestly raised boost levels. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.