JohnA Posted September 16, 2006 Share Posted September 16, 2006 Bob, go to my site and click on the supra. I've got an extensive explanation regarding the workings of the sequential. It may give you ideas on what to troubleshoot. Quote Link to comment Share on other sites More sharing options...
ardasaliah Posted September 16, 2006 Share Posted September 16, 2006 TTC -try the 5 mins version- very easy to do. Will tell you if yout no.2 dead for sure., Quote Link to comment Share on other sites More sharing options...
Mike M Posted September 16, 2006 Share Posted September 16, 2006 After you take it for a run in TTC you can verify that the EGCV and IACV are open by checking that the position pivot arm is away from the adjustable screw. Quote Link to comment Share on other sites More sharing options...
Bob Posted September 27, 2006 Author Share Posted September 27, 2006 Tried the 5-minute TTC mod today (which seemed to make the exhaust embarassingly loud as well!). Given that the car was hitting 5k rpm and struggling to get to 80 I'd say it's certain that no. 2 is a goner. I'm not also pretty sure that the fluttering / tinkling sound I can hear is bits of ceramic stuck in the exhaust system (no 1st decat) On a positive note, hoping to pick up a 2nd hand set of turbos this weekend (thanks to Andyhannah ) Quote Link to comment Share on other sites More sharing options...
Fifty Posted September 27, 2006 Share Posted September 27, 2006 The auto box also seems to playing silly-buggers now; it's not changing down or up where normally it would. good luck with the problem just thought Id comment on the above as this may also be unexplainably linked to you issue faulty speed delimiter/convertor MAY do this. Rich:d Quote Link to comment Share on other sites More sharing options...
Bob Posted October 8, 2006 Author Share Posted October 8, 2006 Got the cat off today, despite a raging hangover - I think the contents of it are fairly conclusive! Quote Link to comment Share on other sites More sharing options...
Ric Posted October 8, 2006 Share Posted October 8, 2006 oops Quote Link to comment Share on other sites More sharing options...
JohnA Posted October 8, 2006 Share Posted October 8, 2006 ewwwww... As you probably know, ceramic turbines have been known to go from 1.2bar upwards (boost very roughly indicates shaft rpm, but at least gives an idea) What sort of boost were you running at the time? Quote Link to comment Share on other sites More sharing options...
jase_93tt Posted October 8, 2006 Share Posted October 8, 2006 Go single, simplifies the entire turbo system and one less turbo to worry about going pop Quote Link to comment Share on other sites More sharing options...
Steviekid Posted October 8, 2006 Share Posted October 8, 2006 Go single, simplifies the entire turbo system and one less turbo to worry about going pop Very expensive to do right though. I'd go down the hybrid route or pick up some second hand stock tubbies, unless you were planning on goin single anyway. Quote Link to comment Share on other sites More sharing options...
colsoop Posted October 8, 2006 Share Posted October 8, 2006 Well thats fairly conclusive Good luck stripping them down Bob, are you still going with 2nd hand tubbies till next year ? Quote Link to comment Share on other sites More sharing options...
Bob Posted October 8, 2006 Author Share Posted October 8, 2006 Car was running at stock boost, the only modification being an exhaust and 2nd decat I'll be going single but not til the new year; thankfully I've got a 2nd-hand set to go on courtesy of Andyhannah I'm quite chuffed so far, as I've managed to get the cat off as well as the turbo stays and oil pipework all with the hangover from hell. I even fell asleep under the car for about half an hour! Must say though, the Loctite 'Freeze & Release' stuff is an absolute godsend! Quote Link to comment Share on other sites More sharing options...
JohnA Posted October 9, 2006 Share Posted October 9, 2006 Bob, Your avatar shows a UKSpec - in that case exhaust and 2nd decat don't alter maximum boost. ...or is it a JSpec (like the signature says) with a bonnet scoop stuck on it? Either way, have you got a boost gauge to verify that it was running stock boost? That would be disconcerting indeed... Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted October 9, 2006 Share Posted October 9, 2006 If he's got those bits of ceramic in the firts cat he's got J-Spec tubos, I am sure it said ealier that it's a J-Spec car with a glued on scoop. Quote Link to comment Share on other sites More sharing options...
Sheefa Posted October 9, 2006 Share Posted October 9, 2006 Chris and co, I understand that obviously the J-spec tubbies are weaker than UK Spec. However, how do new hybrids compare with UK spec tubbies? Are the internals made of steal or are they still weaker in places? I only ask because my new Envy ST3 hyrbids were fitted in May of this year and what to know the 'rough' life expectancy. I never intend to run anything above 1.2 bar, normally I only run *standard?* 1bar. Thanks, Greg Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted October 9, 2006 Share Posted October 9, 2006 I don't agree, I have FAR FAR FAR more trouble with UK spec turbos, they are not built to the same tolerances, go out of balance (wear) faster, and have oil smoke issues at low mileages. I find the J-Spec turbo engines perform better, last longer, and are FAR nicer to drive. Many may disagree with me I don't like hybrids, they don't work well, IMO, the exhaust housings are too small to balance well with much more air flow from the compressor side. having said that I fit quite a dew of them and the owners seem happy! Quote Link to comment Share on other sites More sharing options...
Kranz Posted October 9, 2006 Share Posted October 9, 2006 Greg, your hybrids should take more than 1.2 bar, so will be fine at that setting. J spec hybrids (stage 3's) have all the advantages of the UK spec & the J spec turbos, plus bigger compressor wheels! They have the steel turbines in common with UK spec & the bigger diameter shafts from the J Spec (bigger bearings so can take more load & are less likely to snap!). They will take a lot more boost than a J spec, and should deliver it more efficiently than a UK spec, although they will be more laggy than both. An option to improve hybrids that I'm looking at is to have both the turbine & compressor extrude honed to improve gas flow & therefore spool up time and efficiency. Quote Link to comment Share on other sites More sharing options...
Sheefa Posted October 9, 2006 Share Posted October 9, 2006 Thanks Chris and Sup. I'm quite surprised at that Chris. Just shows the difference of opinion between people and mechanics! Thanks for enlightening me with the advantages of the hybrids Sup mate. Seems they offer good reliability, performance and spool for the money. Happy they were fitted now So Chris as per Sups comments - will having both the turbine & compressor extrude honed improve gas flow & balance the air flow from the compressor side resulting in a faster and more efficent spool up time? Quote Link to comment Share on other sites More sharing options...
Kranz Posted October 9, 2006 Share Posted October 9, 2006 Try here Greg. http://www.nissanperformancemag.com/april06/nerds/ http://www.nissanperformancemag.com/march02/projectser.shtml It looks like its something worth looking into, and if it proves to be not a cost effective benefit then at least its been considered! I'll be doing this at some point on a pair of rebuilt hybrids, and also back to back tests to verify if it has made a difference. I'll let you know how it goes. Quote Link to comment Share on other sites More sharing options...
Sheefa Posted October 9, 2006 Share Posted October 9, 2006 Looks good mate! Will take a look. Yeah please keep me updated. I'm not overly keen on creating a power hungry Sup as it's running about 380 RWHP at the mo, but a little extra wouldn't go a miss! Thanks and good luck buddy. Quote Link to comment Share on other sites More sharing options...
JohnA Posted October 9, 2006 Share Posted October 9, 2006 I don't agree, I have FAR FAR FAR more trouble with UK spec turbos, they are not built to the same tolerances, go out of balance (wear) faster, and have oil smoke issues at low mileages... I guess I've got a 'goodun' then, peaks regularly at 1.5~1.6bar and couldn't exactly be described as 'low mileage'. Not by a long shot. Oil is fully synth changed every 1500-2000 miles though, and airfilter is stock. They still haven't given up the ghost:innocent: I agree about the hybrids ofcourse, they are mismatched and begging for compressor surge without tackling the exh A/R issue Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted October 9, 2006 Share Posted October 9, 2006 I speak generally, John, I have a 300K plus miler that comes in, on stock UK turbos, never had the head off, only a touch of smoke at start up Motorway mileage, regular oil changes 9used to come in forthnightly..... Now retired from high mileage duties, used to do Portsmouth to Inverness nearly daily.. Quote Link to comment Share on other sites More sharing options...
JohnA Posted October 9, 2006 Share Posted October 9, 2006 It's the same as the USSpec. The americans believe that the shaft is a bit too thin for the sort of loads it has to cope with - There was a turbocharger designer/whatever on supraforums explaining the issue. Maybe he was on to something. In any case, I've found experimentally that obsessive/frequent oil changes can greatly prolong the life of a turbo that is running way out of it's limits. People who stick to their manufacturer's intervals miss out, especially when running high boost. It's hard to prove though. Quote Link to comment Share on other sites More sharing options...
Bob Posted October 9, 2006 Author Share Posted October 9, 2006 If he's got those bits of ceramic in the firts cat he's got J-Spec tubos, I am sure it said ealier that it's a J-Spec car with a glued on scoop. Sadly, that is the case. Not only that, but as far as I can tell it's superglue so any chance of a half-decent bonnet once I take the air-brake off (no hole either ) is nil. Quote Link to comment Share on other sites More sharing options...
Bob Posted October 9, 2006 Author Share Posted October 9, 2006 . . . they don't mess about, do they? Looks like #1 was a little worse for wear as well. These taken off at a smidge over 90k miles on the clock. Thought you people would like to see some not-so-pretty pics Quote Link to comment Share on other sites More sharing options...
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