Guest MacNastie Posted April 12, 2007 Share Posted April 12, 2007 hi every one! Here's the thing, my mkiv has bpu on stock turbos,i have no cats in,a apexi duel cone ind kit, denso plugs, apexi charging stabilizer, and hks fcd. I took it down to torque developments in lakeside, and SAM thinks I'm going to blow my turbo's because I'm ruining 1.4 bar or more!could this be true! Ive been ripping it for 6 months or more and nothing to serious has happend apart from hitting the limiter any help! Quote Link to comment Share on other sites More sharing options...
Kranz Posted April 12, 2007 Share Posted April 12, 2007 Is it a Uk spec or J Spec??? 1.3 bar on a J Spec is about the limit IIRC Quote Link to comment Share on other sites More sharing options...
tooquicktostop Posted April 12, 2007 Share Posted April 12, 2007 I am no expert but I think you are pushing it on 1.4+ and stock turbos they will give up sooner or later Quote Link to comment Share on other sites More sharing options...
Mas Posted April 12, 2007 Share Posted April 12, 2007 what ever it is you need to reduce the boost bar to 1.3/1.25 , do you have restrictor ring ? do you have boost controller? dont let it boost to 1.4 any more or you ll be paying a heavy price. Quote Link to comment Share on other sites More sharing options...
Guest gzaerojon Posted April 12, 2007 Share Posted April 12, 2007 i think you've been lucky so far, but 1.4 will put way too much strain of your ceramic blades (asuming it's j-spec) also wtf is a apexi charging stabilizer? Quote Link to comment Share on other sites More sharing options...
uk-rich Posted April 12, 2007 Share Posted April 12, 2007 also wtf is a apexi charging stabilizer? available from ebay, i think they are snake oil Quote Link to comment Share on other sites More sharing options...
tooquicktostop Posted April 12, 2007 Share Posted April 12, 2007 i think you've been lucky so far, but 1.4 will put way too much strain of your ceramic blades (asuming it's j-spec) also wtf is a apexi charging stabilizer? Ballast Quote Link to comment Share on other sites More sharing options...
Kranz Posted April 12, 2007 Share Posted April 12, 2007 Ballast An expensive capacitor Quote Link to comment Share on other sites More sharing options...
Jake Posted April 12, 2007 Share Posted April 12, 2007 The mkivsupra.net boys watched MacNasty with baited breath http://img238.imageshack.us/img238/4471/mrfse003vz1.jpg Quote Link to comment Share on other sites More sharing options...
JamieP Posted April 12, 2007 Share Posted April 12, 2007 Quote Link to comment Share on other sites More sharing options...
Muffleman Posted April 12, 2007 Share Posted April 12, 2007 Quote Link to comment Share on other sites More sharing options...
Guest gzaerojon Posted April 12, 2007 Share Posted April 12, 2007 Quote Link to comment Share on other sites More sharing options...
Guru Posted April 12, 2007 Share Posted April 12, 2007 @ Jake Quote Link to comment Share on other sites More sharing options...
Guest MacNastie Posted April 12, 2007 Share Posted April 12, 2007 thanks everyone! no boost control it wouldent make any dif if the waste gate is fully open anyway! looks like i have to put a cat back in! as for a charging stabilizer you can find them on e-bay this will give you a better description than i could! Guru is you exhaust form the cat back or do you have a restrictor ring in place! Quote Link to comment Share on other sites More sharing options...
SUPRALOOPY Posted April 12, 2007 Share Posted April 12, 2007 boooooooooooooooooooooooooooooommm i'm at 1.25/1.3 and just waiting for the smoke or the big bang!!!!!!! But i have another set or i'll rebuild and go single..LOL Quote Link to comment Share on other sites More sharing options...
Guest MacNastie Posted April 12, 2007 Share Posted April 12, 2007 quick question! does it matter witch cat i put back in? Quote Link to comment Share on other sites More sharing options...
Darren Posted April 12, 2007 Share Posted April 12, 2007 quick question! does it matter witch cat i put back in? Why not just get a restrictor ring? Second CAT is prob easiest to fit. Hope you are running an uprated fuel pump? Quote Link to comment Share on other sites More sharing options...
Soonto_HAS_soop Posted April 12, 2007 Share Posted April 12, 2007 boooooooooooooooooooooooooooooommm i'm at 1.25/1.3 and just waiting for the smoke or the big bang!!!!!!! But i have another set or i'll rebuild and go single..LOL Considering the speed you blat along the Southend Arterial Road, I can't see it taking long.... Quote Link to comment Share on other sites More sharing options...
SUPRALOOPY Posted April 12, 2007 Share Posted April 12, 2007 Considering the speed you blat along the Southend Arterial Road, I can't see it taking long.... Never go over the speed limit me:innocent: Quote Link to comment Share on other sites More sharing options...
dangerous brain Posted April 12, 2007 Share Posted April 12, 2007 OK I will put it a way that might make you back the gas off. On the dyno readings my car took, it actually started to lose power significantly above 1.15 bar. Speaking to the guy that dyno'd it he said that basically most J-spec tubbies have an efficiency range. That efficiency range runs out at about 1.2 bar. If you turn up the boost any more than that you are operating out of the turbo's efficiency range. Just so as you know when you operate turbo's out of their efficiency range they start to generate heat as well as pressure (thats what makes them in-efficient). That heat is stuck straight into your charge inlet air. All you are doing by upping your boost past 1.2 bar is knackering up the power flow. You actually lose power by doing this. Its the same as sticking a 6" exhaust on a 1.1 nova. Quote Link to comment Share on other sites More sharing options...
Wez Posted April 12, 2007 Share Posted April 12, 2007 Also worth noting that if you are J-Spec your fueling is in the hands of the gods at anything above 1.2bar since the stock map sensor tops out at that. Dont bother putting the cats back in, speak to Chris Wilson on this forum and get him to send you a restrictor ring. Quote Link to comment Share on other sites More sharing options...
Guru Posted April 13, 2007 Share Posted April 13, 2007 thanks everyone! no boost control it wouldent make any dif if the waste gate is fully open anyway! looks like i have to put a cat back in! as for a charging stabilizer you can find them on e-bay this will give you a better description than i could! Guru is you exhaust form the cat back or do you have a restrictor ring in place! I have a restrictor ring Quote Link to comment Share on other sites More sharing options...
spidermonkey Posted April 13, 2007 Share Posted April 13, 2007 *hijack* Jake i love the avatar is that from 'Rejected' ? ie "im the queen of France" *hijack over* Quote Link to comment Share on other sites More sharing options...
JamesG Posted April 13, 2007 Share Posted April 13, 2007 Also worth noting that if you are J-Spec your fueling is in the hands of the gods at anything above 1.2bar since the stock map sensor tops out at that. In fact, am I right in thinking that the ECU doesn't get to see boost pressure above 1 bar? I assume the fuel cut defenser will simply clamp the signal to just below what would cause the ECU to cut fuel. In which case, anything above 1 bar is eating into the safety margin of the standard map which is set up rich. Quote Link to comment Share on other sites More sharing options...
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