SIMON LC Posted June 20, 2007 Share Posted June 20, 2007 Just recently bought a TT which is running a higher boost than standard.How can I tell if the Turbos are standard of been upgraded? Link to comment Share on other sites More sharing options...
jaymdee Posted June 20, 2007 Share Posted June 20, 2007 What boost you running and how are you measuring it? Without taking them off, it's probably difficult. Your sequential system pipework may have been modified by the previous owner in some way. Is the exhaust stock, with CATS fitted? Link to comment Share on other sites More sharing options...
gaz1 Posted June 20, 2007 Share Posted June 20, 2007 Just recently bought a TT which is running a higher boost than standard.How can I tell if the Turbos are standard of been upgraded? only way i think is to take the shield of and see if there ceramic or steel blades mate;) or the other way is to rag it till they pop then check what bits are in your tailpipe:p Link to comment Share on other sites More sharing options...
jaymdee Posted June 20, 2007 Share Posted June 20, 2007 Just looked at one of your previous posts. I'm guiessing you've got standard J-Spec Turbos, full decat and NO restrrictor ring. You WILL destroy your turbos (or worse) if you keep running with the boost going off the scale on the standard facelift gauge (which apparently is a bit crap). If I was you, I'd get a restrictor ring and decent boost gauge fitted as suggested in your other thread before something goes bang. Link to comment Share on other sites More sharing options...
edge Posted June 20, 2007 Share Posted June 20, 2007 Tick ,, Tock ,, Tick Link to comment Share on other sites More sharing options...
SIMON LC Posted June 20, 2007 Author Share Posted June 20, 2007 Yeh I got the restrictor ring fitted now and putting boost gauge on over the weekend.I was wondering weather the turbos have been changed thats all.So basically I am looking at what material the impellers are made of,steel of ceramic? Link to comment Share on other sites More sharing options...
Bob Posted June 22, 2007 Share Posted June 22, 2007 No, the impellers are steel on the j-spec as well, it's the hot side that is ceramic. Only way to check that is to take the turbos off completely. Link to comment Share on other sites More sharing options...
SIMON LC Posted June 22, 2007 Author Share Posted June 22, 2007 Shit I dont want to do that?What about markings and model numbers on the outside of the turbo? Link to comment Share on other sites More sharing options...
Sheefa Posted June 22, 2007 Share Posted June 22, 2007 You'll have to take them off like Bob said mate. What did the previous owner say? Just hoping you haven't done any damage running them at a higher boost if they are J-specs. Link to comment Share on other sites More sharing options...
letmeshowyou Posted June 22, 2007 Share Posted June 22, 2007 markings and model numbers won't necessarily tell you anything if they've been hybridised with no external markings. You'll have to take them off mate Link to comment Share on other sites More sharing options...
SIMON LC Posted June 23, 2007 Author Share Posted June 23, 2007 The previous owner did'nt really seem to know much.He attempted to change the clocks and managed to F*** them up so I think I would be wise to just start from scratch rather than take his word for it. Link to comment Share on other sites More sharing options...
SIMON LC Posted June 23, 2007 Author Share Posted June 23, 2007 Ok my results are in with my newly fitted Boost guage.She is blowing max of 0.8 bar which I believe is safe and standard boost?Also pic of how I plumbed it in,is this the right place? Link to comment Share on other sites More sharing options...
Homer Posted June 23, 2007 Share Posted June 23, 2007 Ok my results are in with my newly fitted Boost guage.She is blowing max of 0.8 bar which I believe is safe and standard boost?Also pic of how I plumbed it in,is this the right place? Stock boost is 0.76 bar so you're on target for stock boost. That place is fine to use, though ideally there should be a small filter or damper on the line (stops oil vapour getting into the sensor, though its not a major issue). Link to comment Share on other sites More sharing options...
SIMON LC Posted June 23, 2007 Author Share Posted June 23, 2007 Yeh the little filter is further down the line inside the car.Ok if I take the restrictor ring out the de-cat section will this push the boost right up into dangerous levels? Link to comment Share on other sites More sharing options...
Steve Posted June 23, 2007 Share Posted June 23, 2007 Yes it probably will overboost if you remove the Restrictor Ring, you could always fit a boost controller and up it slightly from there. Link to comment Share on other sites More sharing options...
Homer Posted June 23, 2007 Share Posted June 23, 2007 Yes it probably will overboost if you remove the Restrictor Ring, you could always fit a boost controller and up it slightly from there. Agreed. Although a better option would be to remove the ring and grind it out a little until you reach slightly below your target boost in a high gear. This option will be slightly better on the egt's as it allows a little less back pressure. Link to comment Share on other sites More sharing options...
SIMON LC Posted June 23, 2007 Author Share Posted June 23, 2007 Am I right in assuming upto approx 1.2 bar is a safe zone?Also I have changed my back box from a one off made system to a TRD box and the boost seems to be less,would this be right.The one off made box was very small and louder and offered very little back pressure I would of thought.What sorta readings can I expect to get if I remove the restrictor ring? Link to comment Share on other sites More sharing options...
Homer Posted June 23, 2007 Share Posted June 23, 2007 Am I right in assuming upto approx 1.2 bar is a safe zone?Also I have changed my back box from a one off made system to a TRD box and the boost seems to be less,would this be right.The one off made box was very small and louder and offered very little back pressure I would of thought.What sorta readings can I expect to get if I remove the restrictor ring? Without the restrictor it will run away, 1.6bar is easily possible. If the weather is around 20 degress C you should aim for 1.1bar or slightly less, as when the cooler weather comes round this will hit 1.2 bar easy. The TRD system is a relatively restrictive system comared to most aftermarket systems, but it shouldn't make any real difference to boost pressure if both cats are already gone. Link to comment Share on other sites More sharing options...
SIMON LC Posted June 23, 2007 Author Share Posted June 23, 2007 Ok cheers guys.I will file the restrictor ring out till I am peaking at about 1.1 and leave it at that.I assume nobody has had any major dramas reliability wise running at this boost? Link to comment Share on other sites More sharing options...
Steve Posted June 23, 2007 Share Posted June 23, 2007 Alot of people do run slightly more than that. But that is a safe figure to aim for Link to comment Share on other sites More sharing options...
Flip Posted June 23, 2007 Share Posted June 23, 2007 My boost creeps a bit... .if I intently watch my boost gauge for a 3rd gear pull it will (for example) hover at 1.15bar - then I look at peak boost and its at 1.25bar or something! Anyone else have this prob? More importantly is this a problem for the stock Jspecs? If they sustain boost under 1.2bar but peak a bit above it, is that ok? Link to comment Share on other sites More sharing options...
Guest 0h2JAY Posted July 4, 2007 Share Posted July 4, 2007 ...... Link to comment Share on other sites More sharing options...
Jake Posted July 4, 2007 Share Posted July 4, 2007 yeah tis normal i got's a j-pec you need to upgrade your ecu and boost controller and get rid of the bcd or fcd i have same problem in 3rd and 4th running 14 psi but trust me if you are running a stock j-spec dont boost more then 14 as the stock intercooler is only a restriction and there is pressure drop of about 2lbs throu it so 14 on the gauge = 16 of the comp wheel.... i gots 270rwhp @ 13psi cant complain SIMON LC, you can safely ignore the above post. Link to comment Share on other sites More sharing options...
Steve Posted July 4, 2007 Share Posted July 4, 2007 SIMON LC, you can safely ignore the above post. Good call Jake Link to comment Share on other sites More sharing options...
Guest 0h2JAY Posted July 4, 2007 Share Posted July 4, 2007 my mistake wrong thread quick post :S sorry guy's Link to comment Share on other sites More sharing options...
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