Scooby Posted July 11, 2006 Share Posted July 11, 2006 Afternoon all, I have a UK 6 speed and I am about to fit a boost controller, does anyone know what I can allow my turbos to boost to?? I think I herd a rumor they were ok at 1.4 Bar but I wanted to check. Brad Quote Link to comment Share on other sites More sharing options...
Thorin Posted July 11, 2006 Share Posted July 11, 2006 1.2 Quote Link to comment Share on other sites More sharing options...
LeeT Posted July 11, 2006 Share Posted July 11, 2006 i ran them at 1.3 bar with no problems. i have heard of 1.4 but i cant really see it producing any more power and the lifespan of your turbos will be very short Quote Link to comment Share on other sites More sharing options...
Sharpie Posted July 12, 2006 Share Posted July 12, 2006 Lee, did you have an AFR gauge fitted at the time for 1.3 bar ? Brad, I have it in my head from when I first joined here that 18psi / 1.24 bar was the max you could run with the stock fuelling map on UK spec. I could be wrong but, I'm sure some of the old posts would answer this for you. IMO if you want to enjoy BPU keeping the turbo's lifespan in mind, 1.2 bar max. Quote Link to comment Share on other sites More sharing options...
Homer Posted July 12, 2006 Share Posted July 12, 2006 Let it run unlimited, most of the local guys do and they have no problem (so far!) If it blows up, build a beast BTW - did you get my message re Saturday ? Quote Link to comment Share on other sites More sharing options...
JohnA Posted July 12, 2006 Share Posted July 12, 2006 Afternoon all, I have a UK 6 speed and I am about to fit a boost controller, does anyone know what I can allow my turbos to boost to?? I think I herd a rumor they were ok at 1.4 Bar but I wanted to check. Brad *Anything above stock levels will reduce the life of the turbos, I hope that much is clear* I run mine currently at 1.5 - max possible without an extra spring in the wastegate. They are more resilient than the JSpec ones - they haven't got the ceramic turbine glued on, so it cannot break loose. As for overspeeding damage to the shaft ---- well that's another story. Change your oil often, that helps a bit. Fuelling is surprisingly adequate as well, remember that the UKSpec has 550cc injectors as stock, plus a stronger fuel pump. Even at these levels, I use the AFCII to actually pull out fuel:d Quote Link to comment Share on other sites More sharing options...
letmeshowyou Posted July 12, 2006 Share Posted July 12, 2006 John, are you taking fuel out even at full boost? Quote Link to comment Share on other sites More sharing options...
Thorin Posted July 12, 2006 Share Posted July 12, 2006 ...and what are EGT's like running at 1.5bar? Waaaay out of the turbo's efficiency range and will end up just producing more heat than anything. Quote Link to comment Share on other sites More sharing options...
letmeshowyou Posted July 12, 2006 Share Posted July 12, 2006 id imagine he doesn't have an egt problem with the various injection methods he's employed Quote Link to comment Share on other sites More sharing options...
JohnA Posted July 12, 2006 Share Posted July 12, 2006 John, are you taking fuel out even at full boost? yes, at 21psi I need to take off 15% to get them to low 12s Quote Link to comment Share on other sites More sharing options...
JohnA Posted July 12, 2006 Share Posted July 12, 2006 id imagine he doesn't have an egt problem with the various injection methods he's employed True, mine is unconventional and doesn't mean for a moment that it's safe to take a stock car, boost it to 1.5bar and take fuel off at the same time. That would be unwise But it indicates the resilience of UKSpec turbos. They just won't die, he he... Some of my "boost" is pure steam, so no oxygen molecules there (hence no need to pair them with fuel molecules;) ) This 'deadweight' steam pays for itself earlier on though, as it increases the efficiency of the compressors and drops charge temps *below* the theoretical figure. That is equivalent to having compressor efficiency ~ 130% - by cheating ofcourse (the laws of thermodynamics have not been amended lately), but the discharge temps are low all the same. Stock SMIC is having a very easy life, like freakin walking in the park:) Quote Link to comment Share on other sites More sharing options...
bignum Posted July 12, 2006 Share Posted July 12, 2006 John, your running stock uk tubbies at 1.5 bar? hell i was worried about going too 1.1, so how does that work, the steam thing. Quote Link to comment Share on other sites More sharing options...
wkdtime Posted July 12, 2006 Share Posted July 12, 2006 John, your running stock uk tubbies at 1.5 bar? hell i was worried about going too 1.1, so how does that work, the steam thing. PFM thats how it works....Pure Fuc**ng Magic Quote Link to comment Share on other sites More sharing options...
JohnA Posted July 13, 2006 Share Posted July 13, 2006 John, your running stock uk tubbies at 1.5 bar? hell i was worried about going too 1.1, . Boost is not a good indicator, beware. * Just adding heat will show as more boost, so there's a big gotcha;) * Adding restrictions to airflow will show as more boost, that's another nail in the 'boost' coffin. * Higher airflow (what really makes power) won't necessarily show as more boost * Fast-expanding steam (as in my case) creates pressure that shows as boost - yet if you find any way to combust steam, please let me know, lol... So don't be in awe with fancy boost figures thrown around (for more, also read the 'boost is good' page on my site) .so how does that work, the steam thing. It allows the turbo shaft speeds to be lower for the same total airflow, which is good (cannot tell exactly how much though without measuring shaft rpm) It also allows operation at lower temps all the way from the diffuser onwards, another good thing. Intercooling needs are much reduced, to the point that a good SMIC is more than adequate (I had plans to augment it with a chargecooler, but these are shelved since charge temps are laughably low) You need to replenish the tank often though (it is lossy). After every boosted ride it has drunk 0.5-1litre. Quote Link to comment Share on other sites More sharing options...
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