cmm-racing Posted December 8, 2008 Share Posted December 8, 2008 Hi I have just bought my first zx today its a twin turbo model. The seller told me before I bought the car that it was not boosting, this didn't put me off too much as it was a bit of a bargain. However I obviously want to try and sort the problem out and was wondering if anybody has any ideas of what is the likley cause or any checks I can do to try and diagnose the fault. Any help would be great :) Quote Link to comment Share on other sites More sharing options...
JeffTT Posted December 8, 2008 Share Posted December 8, 2008 No boost as in not going past zero normally means at least one seized turbo, a boost leak to cause zero boost would be so serious that not only would you hear it the car engine would not run well even at idle. So looks like you will be taking the engine out then:cry: Sorry Jeff TT Quote Link to comment Share on other sites More sharing options...
cmm-racing Posted December 8, 2008 Author Share Posted December 8, 2008 No way of unseizeing it without taking it off then? would I not get at least some boost if just one turbo was siezed or does one not work without the other? Quote Link to comment Share on other sites More sharing options...
petes21st Posted December 8, 2008 Share Posted December 8, 2008 no, if one doesn't work, none do Quote Link to comment Share on other sites More sharing options...
dunk300zxtt Posted December 8, 2008 Share Posted December 8, 2008 no, if one doesn't work, none do Not quite true...... If one is siezed, the other one can still work, but can only flow enough air for 150hp (think about it ;)) Quote Link to comment Share on other sites More sharing options...
petes21st Posted December 8, 2008 Share Posted December 8, 2008 nope, because the balance bar regualates the air between the two, so if one isn't boosting the other goes straight out the back Quote Link to comment Share on other sites More sharing options...
dunk300zxtt Posted December 8, 2008 Share Posted December 8, 2008 What do you mean? straight out the back? Quote Link to comment Share on other sites More sharing options...
SMW1 Posted December 8, 2008 Share Posted December 8, 2008 If one turbo is siezed you will not get any boost at all. I had this on mine passenger turbo siezes and couldn't get above 0 psi. Engine pull and turbo replacement. You should have asked here first before you bought the car. it would have saved you £1k. Quote Link to comment Share on other sites More sharing options...
Funkysi Posted December 8, 2008 Share Posted December 8, 2008 No way of unseizeing it without taking it off then? would I not get at least some boost if just one turbo was siezed or does one not work without the other? You might be lucky and find it's only one seized turbo and be the passenger side. In which case you can replace with a used one and not have to drop the engine. But wouldn't advise. The Z is not a car that can be maintained on a shoe-string. Hope you get it sorted. Quote Link to comment Share on other sites More sharing options...
Daves_Zed Posted December 8, 2008 Share Posted December 8, 2008 This is the same problem I currently have with Eliza :( So the future is not looking good at the moment, combined with paintwork problems and a couple of serious dents, this may look like the end of Eliza. And as I no longer have anywhere that I can break her, then it looks like she'll probably be scrapped, as I'm sure no one would buy her as she is :cry: Quote Link to comment Share on other sites More sharing options...
Daves_Zed Posted December 8, 2008 Share Posted December 8, 2008 "Always look on the bright side of life................" Quote Link to comment Share on other sites More sharing options...
Funkysi Posted December 8, 2008 Share Posted December 8, 2008 This is the same problem I currently have with Eliza :( So the future is not looking good at the moment, combined with paintwork problems and a couple of serious dents, this may look like the end of Eliza. And as I no longer have anywhere that I can break her, then it looks like she'll probably be scrapped, as I'm sure no one would buy her as she is :cry: Don't break it! I can't believe your car has gotten into that state after all the care you've given it. Quote Link to comment Share on other sites More sharing options...
petes21st Posted December 8, 2008 Share Posted December 8, 2008 What do you mean? straight out the back? wastegate, out ito the exhaust the boost pressure will not build up, air will spin the blades but you wont get boost Quote Link to comment Share on other sites More sharing options...
Funkysi Posted December 8, 2008 Share Posted December 8, 2008 PS. This photo's always made me laugh. Looks like you're trying a nurse a boner. :rofl: Quote Link to comment Share on other sites More sharing options...
Quavey Posted December 8, 2008 Share Posted December 8, 2008 what hes trying to say is that any boost the working turbo generates will be lost through the duff turbo since the balance bar is there to equalise pressure on both side of the engine, all the boost will be lost through the siezed blades. Which means you'll get atmospheric pressure in the manifold (0). Basically a case of findout which is siezed then you can look at how much of a job it is to replace. Although if one is knackered then other probably isnt far behind... So in that case, pop the engine out and go from there :) Quote Link to comment Share on other sites More sharing options...
Daves_Zed Posted December 9, 2008 Share Posted December 9, 2008 Si, I don't want to break her if I can avoid it, but like everything else these days, I've got to find the money from somewhere to pay for the repair. I really do love owning and driving her, and I'm still actively pursuing ways to have her sorted out. PS. This photo's always made me laugh. Looks like you're trying a nurse a boner. :rofl: I prefer the next one, the one where I have my weapon out!!! ;) Quote Link to comment Share on other sites More sharing options...
jaffa Posted December 9, 2008 Share Posted December 9, 2008 I wonder, do you still count it as a bargain after reading this thread? Quote Link to comment Share on other sites More sharing options...
SMW1 Posted December 9, 2008 Share Posted December 9, 2008 Just out of interest. How much did you pay for it and what else does the car have on it ?. Everything else in good condition ?. i.e. seals, sub frame, arches etc ?. No rust ? Quote Link to comment Share on other sites More sharing options...
TopLess Posted December 9, 2008 Share Posted December 9, 2008 The balance bar help to even things out, also the passenger side turbo feeds the drivers side cylinders and vice versa! Quote Link to comment Share on other sites More sharing options...
Uno Posted December 9, 2008 Share Posted December 9, 2008 back to diagnostic...could the fella not just blank off the balance bar to see which tub is seized...or is it easier just to ram some cloth up the tailpipe and force the pressure down one side / tub? Quote Link to comment Share on other sites More sharing options...
TopLess Posted December 9, 2008 Share Posted December 9, 2008 back to diagnostic...could the fella not just blank off the balance bar to see which tub is seized...or is it easier just to ram some cloth up the tailpipe and force the pressure down one side / tub? No mate one turbo feeds the opposite bank, a proper way to confirm it, is to pull off the downpipes and look at the turbine wheel! Quote Link to comment Share on other sites More sharing options...
crotchrocket Posted December 9, 2008 Share Posted December 9, 2008 I wonder, do you still count it as a bargain after reading this thread? Thats what i wondered, hope he was given it!!! As it will cost as much as a working Z to repair!!! Are there any other symptoms? Can't just have low boost can it? rough idle, coughing etc? As stated by Mark, If one tub is duff then it will not be boosting the opposite bank of cylinders, then that turbo is not going to be spooling up fast enough to boost the cylinders with a duff turbo!! not sure how you'd find which one was dead, lol Quote Link to comment Share on other sites More sharing options...
dunk300zxtt Posted December 9, 2008 Share Posted December 9, 2008 wastegate, out ito the exhaust the boost pressure will not build up, air will spin the blades but you wont get boost Ah I see where you're coming from now. What I mean is 1 stock turbo cannot supply enough air to put the engine into positive boost anyway, so it's always going to be in vacuum or '0', not higher. I've done 3~4 tubs now so i know those symptoms LOL Another way to check which turbo has gone is to loosen the 2 rubber tubes that go to the inlet manifold, fire the engine up, and pull one off. You will need to give it a bit of throttle to keep it from stalling but you will feel air rushing out of the pipe that comes from the I/C on the side with the working turbo. As FunkySi says, L/H turbo is FAR easier to replace than R/H. Last time I replaced my L/H it took me 5 hrs start to finish. On my red car the R/H turbo is gone at the moment and I've built an engine to swap into it over the Christmas break. Quote Link to comment Share on other sites More sharing options...
dunk300zxtt Posted December 9, 2008 Share Posted December 9, 2008 cmm-racing........ I see you're from Preston. Andy Duff is very close to you up that way, it might be worth him having a look but I guess it won't be good news. http://www.zxtreme.co.uk Quote Link to comment Share on other sites More sharing options...
damo-f Posted December 9, 2008 Share Posted December 9, 2008 i've got the same problem with mine at the minute. mine is passenger side turbo, but luckily the turbos are under warranty still so should hopefully be sorted foc (minus pulling engine). the way i found out which 1 it was, was to just pull the actuator feed pipe off the i/c and pop a boost gauge on an give it a lil rev. anyway, hope u get it sorted mate 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.