Mas Posted May 26, 2007 Share Posted May 26, 2007 Took the car to Mark today to get my MOT sorted, all the way today noticed the second turbo kicks well over 4000 REVs, actually about 4500ish , Im sure it used to kick just before 4000 before and thats the way should be, so what do you think is the problem here ? Turbos working perfectly though and the car pulls just as good as ever but this late kicking worries me ?! Link to comment Share on other sites More sharing options...
Mike M Posted May 26, 2007 Share Posted May 26, 2007 Could be anything from a cracked hose not opening up the EGCV quickly enough to a vsv fault. If it only does this once and No-2 comes in fine every other gear and repeats this after being off boost for a while then I'd say it could be the EGBV for pre spooling No-2. Lots of stuff to read through in the search function, seems quite common this. Link to comment Share on other sites More sharing options...
Mas Posted May 26, 2007 Author Share Posted May 26, 2007 Could be anything from a cracked hose not opening up the EGCV quickly enough to a vsv fault. If it only does this once and No-2 comes in fine every other gear and repeats this after being off boost for a while then I'd say it could be the EGBV for pre spooling No-2. Lots of stuff to read through in the search function, seems quite common this. Thanks alot mate I'll search for the above subjects and see what I come up with, could it be because of the disconnected VSV hose ? as we had to disconnect it once I installed my boostcontroller, due to boosting to over 1.7 bar with BPU !!! then found out that hose has to be blocked and soon as I did that the boost came back to 1.2 Link to comment Share on other sites More sharing options...
Mike M Posted May 26, 2007 Share Posted May 26, 2007 Could be as the leaking hose will prevent the correct pressure build up in the valve actuators to operate the valves and wastegate. Depends which hose was disconnected though. Link to comment Share on other sites More sharing options...
hiten55 Posted May 26, 2007 Share Posted May 26, 2007 is that not normal then? mine kicks in at 4200, done this since i bought it so i though it was ok Link to comment Share on other sites More sharing options...
flukey-lukey Posted May 26, 2007 Share Posted May 26, 2007 is that not normal then? mine kicks in at 4200, done this since i bought it so i though it was ok same here Link to comment Share on other sites More sharing options...
Whitesupraboy2 Posted May 26, 2007 Share Posted May 26, 2007 before my turbo change mine use to kick in around 3500rpm. now with these new turbo's it doesnt Link to comment Share on other sites More sharing options...
Angarak Posted May 26, 2007 Share Posted May 26, 2007 I had a similar problem a while back, tubby #2 was coming in late, and when it did it was 'violent' as if the turbo wasn't pre-spooling properly. Having investigated the plumbing, I discovered that one of the pipes on the EGBV actuator has rotted off (the worst pipes to reach!). See the 2 pipes coming off the actuator (#5) here: http://www.mkivsupra.net/vbb/attachment.php?attachmentid=13950&d=1112559186 Having replaced the pipe with the aid of my dad (a mechanic) and plenty of swearing, its been fine since. Link to comment Share on other sites More sharing options...
Sheefa Posted May 26, 2007 Share Posted May 26, 2007 Don't know if it's the same for the Seq setup, but Greg @ Turbofit mentioned on the singles that a later spool time generally means the turbo is getting weaker. Can't remember who it was specifically, but theirs had gone from a spool rate + 800 odd or something. Mine goes like the clappers from 4k exactly thank the lord I wouldn't worry about it Mas. Run it til she blows mate Link to comment Share on other sites More sharing options...
Mas Posted May 27, 2007 Author Share Posted May 27, 2007 thanks for all the help guys, as I said they perform perfectly and pull same as before once they kick off, so I might just try and play with some of the mentioned hoses and if nothing changed I just get n with it til they die That didnt mean Im gonna go single though Link to comment Share on other sites More sharing options...
AndyT Posted May 27, 2007 Share Posted May 27, 2007 thanks for all the help guys, as I said they perform perfectly and pull same as before once they kick off, so I might just try and play with some of the mentioned hoses and if nothing changed I just get n with it til they die That didnt mean Im gonna go single though Yet Hope you sort it though. Link to comment Share on other sites More sharing options...
Henk Posted May 27, 2007 Share Posted May 27, 2007 Mas as you know I'm no techie car expert but my 2nd cuts in just a smidge before 4000 (assuming my rev counter is accurate) Link to comment Share on other sites More sharing options...
Mas Posted May 27, 2007 Author Share Posted May 27, 2007 Mas as you know I'm no techie car expert but my 2nd cuts in just a smidge before 4000 (assuming my rev counter is accurate) Thats the way should be Henk, mine used to kick about 4000, but not anymore! Link to comment Share on other sites More sharing options...
Mas Posted May 29, 2007 Author Share Posted May 29, 2007 Guys regarding this thread: http://www.mkivsupra.net/vbb/showthread.php?t=35926 "Usually this is caused by no prespool taking place - your IACV opens, your EGCV opens, but the second turbo is sat on it's ass doing nothing. So, not only has it got to suddenly get up to speed, but it's fighting against #1's output trying to go backwards through it. Hence, the looong lag. This is usually caused by the EGBV not opening. You may notice more than 0.8bar of boost being generated by #1 turbo because of this, as the EGBV also acts as #1's wastegate." I just can't find any info to direct me to the exact part that needs to be replaced or fixed! might sounds dum but I tried the VSV related hoses and no split etc whatso ever! Link to comment Share on other sites More sharing options...
Rich Posted May 29, 2007 Share Posted May 29, 2007 is the problem erratic? My other car used to either 2nd turbo didnt kick in at all,sometimes came on song at the right time and sometimes really late .The problem was the pressure tank. More and more times now its occuring that pressure tanks are playing up on peoples cars. Link to comment Share on other sites More sharing options...
Whitesupraboy2 Posted May 29, 2007 Share Posted May 29, 2007 how easy is it to get to the pressure tank? can anything be fixed on it? Link to comment Share on other sites More sharing options...
Mas Posted May 29, 2007 Author Share Posted May 29, 2007 is the problem erratic? My other car used to either 2nd turbo didnt kick in at all,sometimes came on song at the right time and sometimes really late .The problem was the pressure tank. More and more times now its occuring that pressure tanks are playing up on peoples cars. no its not erratic, same thing keeps happening without changing the way it is, kicks at around 5000 revs which is late! it only started doing it since saturday (or atleast then was when I noticed it) I'm gonna check the pressure tanks too if I know what Im looking at . Link to comment Share on other sites More sharing options...
Rich Posted May 29, 2007 Share Posted May 29, 2007 The pressure tank is located under the bottom inlet manifold runners and is a bitch to get at. The best way to get it out is get underneath and remove the starter motor which is in the way,then you can get the damn thing out and swap it for the new one. Link to comment Share on other sites More sharing options...
Mas Posted May 29, 2007 Author Share Posted May 29, 2007 The pressure tank is located under the bottom inlet manifold runners and is a bitch to get at. The best way to get it out is get underneath and remove the starter motor which is in the way,then you can get the damn thing out and swap it for the new one. Oh not removing starter motor again:( only done that last month and what a pain it is! Link to comment Share on other sites More sharing options...
Mike M Posted May 29, 2007 Share Posted May 29, 2007 I think you can blow down the IACV VSV supply hose and feel the resistance of the pressure tank. Well you should feel resistance as long as its ok. Link to comment Share on other sites More sharing options...
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