jacko Posted January 25, 2009 Share Posted January 25, 2009 I know there are loads of posts about problems with the stock turbos caused by sticking valves etc.... but just wondered if you could help me with my problem. It's not a case of the 2nd turbo not working at all, it works sometiems, and then other times the first turbo boosts and then drops right off. Im guessing it is something to do with one of the actuators, but does this help to narrow it down to exactly which one is causing the problem? Cheers!! Quote Link to comment Share on other sites More sharing options...
supraGZaerotop Posted January 25, 2009 Share Posted January 25, 2009 have good look at all your vacuum lines around the turbos/vsvs to see if any are spilt, maybe vsv fault Quote Link to comment Share on other sites More sharing options...
jacko Posted January 31, 2009 Author Share Posted January 31, 2009 I took it to a RR day today and the second turbo decided not to put in an appearance, so i really need to get the problem sorted. I would do it myself, but the TT system seems quite complex and i'd rather just let a pro do it. Can anybody recommend somewhere to take it thats not too far from Northants Quote Link to comment Share on other sites More sharing options...
Steve Posted January 31, 2009 Share Posted January 31, 2009 Have a look through this thread mate http://www.mkivsupra.net/vbb/showthread.php?t=35926 May be one of the VSV's which are fairly easy to get to Quote Link to comment Share on other sites More sharing options...
Tom Posted January 31, 2009 Share Posted January 31, 2009 (edited) I had a problem like this a few years back, it turned out to be a faulty IACV VSV, sometimes the VSV would work and I'd see 0.9bar with both turbo's online but then it would drop down to 0.7, and other times the 2nd turbo didnt come on at all. If you pop outside, start your car then raise the revs from in the engine bay quickly to around 4-5k you should be able to see the actuator move, if it doesnt then this could be your problem It's takes about 1min to replace one of these vsv's or you could try this to diagnose the problem, http://mkiv.supras.org.nz/articles/andy.htm this thread may help too http://www.mkivsupra.net/vbb/showthread.php?t=49070&highlight=vsv Edited January 31, 2009 by Tom (see edit history) Quote Link to comment Share on other sites More sharing options...
Homer Posted January 31, 2009 Share Posted January 31, 2009 This is a very common problem. If you lift off and reapply the throttle does the 2nd turbo come online? As Tom says the VSV can cause a problem but more commonly it's the EGBV actuator sticking. Pig of a job to swap Quote Link to comment Share on other sites More sharing options...
jacko Posted January 31, 2009 Author Share Posted January 31, 2009 (edited) no it doesnt come online if i let off, ive try dipping the clutch as well, nothing helps. I need to get it sorted, i got 195bhp on the dyno earlier lol Is this the right actuator? If so i'll have a look at it tomorrow. Its only boosting on first turbo atm, so i'll give it a tap and see if the second one shows up Just thought i'd mention, it doesnt sound very loud when the second turbo doesnt work, not like the air is coming thru the exhaust system, more like it's never been in the 2nd turbo at all, if that makes any sense? The boost pressure is going from 7psi on first turbo to 0psi when the second should come on Edited February 2, 2009 by jacko (see edit history) Quote Link to comment Share on other sites More sharing options...
spiderpigcity Posted February 3, 2009 Share Posted February 3, 2009 no it doesnt come online if i let off, ive try dipping the clutch as well, nothing helps. I need to get it sorted, i got 195bhp on the dyno earlier lol Is this the right actuator? If so i'll have a look at it tomorrow. Its only boosting on first turbo atm, so i'll give it a tap and see if the second one shows up Just thought i'd mention, it doesnt sound very loud when the second turbo doesnt work, not like the air is coming thru the exhaust system, more like it's never been in the 2nd turbo at all, if that makes any sense? The boost pressure is going from 7psi on first turbo to 0psi when the second should come on i have a second turbo for sale and all the vsv valves if you need em Quote Link to comment Share on other sites More sharing options...
jacko Posted April 1, 2009 Author Share Posted April 1, 2009 Would a dodgy BOV be enough to cause this problem? Quote Link to comment Share on other sites More sharing options...
chazuk Posted April 1, 2009 Share Posted April 1, 2009 Would a dodgy BOV be enough to cause this problem? Yes I spent ages looking for a problem where my 2nd turbo would not kick in , supramatt came round popped off the bov and could blow though it when you shouldnt be able to . I got a screw driver to it to double check and the seal had spilt . Replaced it and good as new. Quote Link to comment Share on other sites More sharing options...
adnanshah247 Posted April 1, 2009 Share Posted April 1, 2009 (edited) well me and robert learnt a lot about the tt set up when we were mucking around on my car. theres a very very small pipe near the bottom side of the turbo which wasnt on, i was getting no second turbo at all as a result of it and everything your saying sounds exactly the same to what happened to me. Edited April 1, 2009 by adnanshah247 (see edit history) Quote Link to comment Share on other sites More sharing options...
legendswraith Posted April 1, 2009 Share Posted April 1, 2009 I might have the wrong bits of the system here but if you put it into true twin instead of sequential doesn't that remove the VSVs from the loop. Ignore me if you have done this already. Also whereabouts in northants are you as i have to go to corby/kettering every weekend and i have a stock bov if it will help Quote Link to comment Share on other sites More sharing options...
Rajinder Posted April 1, 2009 Share Posted April 1, 2009 Had the same problem, apart from all the above you could check you EGCV VSV. We found out that the EGCV VSV on our car was faulty, replaced it with a new one and the problem was solved. Quote Link to comment Share on other sites More sharing options...
Guigsy Posted April 1, 2009 Share Posted April 1, 2009 Can anybody recommend somewhere to take it thats not too far from Northants Im sure Silverstone garrage will be able to figure it out for you. Im taking mine on wednesday. Quote Link to comment Share on other sites More sharing options...
jacko Posted April 1, 2009 Author Share Posted April 1, 2009 Ye that's where im thinking of going. The problem is intermittent so im wondering if maybe the BOV is sticking open sometimes, or sometimes sticking shut, as the car randomly started chattering the other day, and then stopped again I'll check that first, as its the easiest / cheapest to sort Quote Link to comment Share on other sites More sharing options...
Guest supraman582 Posted April 1, 2009 Share Posted April 1, 2009 I had exactly the same problem as u mate with the stock turbos, if you want to get it sorted then check out advancedme.co.uk theyre based in silverstone ask for Dan he sorted mine out no problem. Quote Link to comment Share on other sites More sharing options...
Homer Posted April 1, 2009 Share Posted April 1, 2009 It's often the EGCV that causes it (thats the common one anyway). it's sort of centre top in the diagram. Also, a dodgy BOV can stop the 2nd turbo coming online, make sure it's connected up the right way round too! Any change you can post a pic of it? Quote Link to comment Share on other sites More sharing options...
Scott Posted April 1, 2009 Share Posted April 1, 2009 Personally i would check the IACV. If the iacv isn't working the 2nd turbo will pre-spool but won't come online. This is quite dangerous as it means you will be overworking the first turbo. After that its time to check the EGCV, if the EGCV isn't working then the 2nd turbo won't be getting any exhaust gas and when the IACV opens all of the pressure will be lost from turbo 1. This is less dangerous as the 1st turbo won't overspool. An easy and quick way to test the VSV's is to do the 5 min ttc mod. All you do is take the pipe from the rail to the IACV VSV out and plug it directly into the IACV actuator (this negates the VSV). Do the same with the EGCV, just plumb the pipe from the vac rail into the EGCV (does the same, negates the VSV). Take the car for a run. If you get full boost then its one of the VSV's. If you don't, its either the pressure tank, the actuators, the valves or the turbo's themselves. Quote Link to comment Share on other sites More sharing options...
adnanshah247 Posted April 2, 2009 Share Posted April 2, 2009 hey just nicked this pick from another thread but what i was talking about was the part marked but the number 3, the plumbing was loose on that. Quote Link to comment Share on other sites More sharing options...
jacko Posted April 2, 2009 Author Share Posted April 2, 2009 Ive ordered a reducer so i can fit my Greddy BOV, so we'll see if that sorts it Quote Link to comment Share on other sites More sharing options...
Guest drlee Posted April 3, 2009 Share Posted April 3, 2009 (edited) Pimping of wares without specifically being asked for quotes isn't required in tech thank you - Ian Edited May 4, 2009 by Ian C (see edit history) Quote Link to comment Share on other sites More sharing options...
Guest drlee Posted April 3, 2009 Share Posted April 3, 2009 (edited) Pimping of wares without specifically being asked for quotes isn't required in tech thank you - Ian Edited May 4, 2009 by Ian C (see edit history) Quote Link to comment Share on other sites More sharing options...
jacko Posted April 12, 2009 Author Share Posted April 12, 2009 Im still hunting around the engine trying to find the problem. Ive noticed that when i rev the engine the IACV actuator moves (opens or closes?) and then once the revs have dropped down to idle the arm moves back again. Is this right? Quote Link to comment Share on other sites More sharing options...
jacko Posted April 23, 2009 Author Share Posted April 23, 2009 anybody? Quote Link to comment Share on other sites More sharing options...
Scott Posted April 24, 2009 Share Posted April 24, 2009 Yeah thats perfectly normal Quote Link to comment Share on other sites More sharing options...
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