philsmith1a Posted October 13, 2010 Share Posted October 13, 2010 Just had some s/h j-spec turbos fitted (minimum play in shafts and visible impellers in perfect condition), problem in having is there is next to no boost being generated from the first turbo. When the second turbo kicks in everything seems to be fine. I have searched for days on this but I can’t find a cause. I have checked the IACV VSV and it seems to be working as it should, also checked all related piping. What do I check next? How could I check the actuators are working properly? p.s. car was running fine before turbo change. Quote Link to comment Share on other sites More sharing options...
Dr_Doom Posted October 13, 2010 Share Posted October 13, 2010 When the second turbo kicks in do you get full boost? (0.9bar+) If yes then it definitely sounds like a VSV / Actuator problem. I'd start by double checking that all the hoses are the correct way round as it's easy to mix them up. There's that many, it's easy to forget one Quote Link to comment Share on other sites More sharing options...
philsmith1a Posted October 14, 2010 Author Share Posted October 14, 2010 Yes, getting full boost when second turbo kicks in, although once or twice it has held back and neither turbos have kicked in. Will check all hoses again but it just seems strange to me that a vsv or actuator would fail when the new turbos were fitted. Quote Link to comment Share on other sites More sharing options...
pistonbroke Posted October 14, 2010 Share Posted October 14, 2010 I bet you have a couple of hoses backwards. Quote Link to comment Share on other sites More sharing options...
Jurgen-Jm-Imports Posted October 14, 2010 Share Posted October 14, 2010 (edited) did you split the turbos to check the EX side wheel is still on.. as this can also cause your issue ( i have learned this from experience and had to get some more lol) Edited October 14, 2010 by Jurgen-Jm-Imports (see edit history) Quote Link to comment Share on other sites More sharing options...
philsmith1a Posted October 14, 2010 Author Share Posted October 14, 2010 That doesn't sound good. Surely if that was the issue it would sound really rough. Anyone know how I could check the operation of the actuators? Quote Link to comment Share on other sites More sharing options...
philsmith1a Posted October 24, 2010 Author Share Posted October 24, 2010 Iv checked the VSVs are working , all seems ok(switching when connected to battery) Next I did TTC mod to try and rule out the IACV actuator, after the ECU sorted is self out the car ran and boosted EXACTLY the same. As the IACV actuator can be moved manually, would this mean there is something up with the signal to the VSV? Could it still be a damaged first turbo? Quote Link to comment Share on other sites More sharing options...
Jurgen-Jm-Imports Posted October 24, 2010 Share Posted October 24, 2010 Iv checked the VSVs are working , all seems ok(switching when connected to battery) Next I did TTC mod to try and rule out the IACV actuator, after the ECU sorted is self out the car ran and boosted EXACTLY the same. As the IACV actuator can be moved manually, would this mean there is something up with the signal to the VSV? Could it still be a damaged first turbo? have you split the turbos to check Quote Link to comment Share on other sites More sharing options...
philsmith1a Posted October 24, 2010 Author Share Posted October 24, 2010 No not yet, wanted to try to eliminate everything else before pulling them out. Quote Link to comment Share on other sites More sharing options...
Jurgen-Jm-Imports Posted October 24, 2010 Share Posted October 24, 2010 No not yet, wanted to try to eliminate everything else before pulling them out. am pretty sure you can check the first turbo ex side by stripping certain parts etc.. am sure we have done this before. Quote Link to comment Share on other sites More sharing options...
philsmith1a Posted October 25, 2010 Author Share Posted October 25, 2010 i hope so. i am still boosting over 1bar, would this be the case if the 1st turbo wasn't working? Quote Link to comment Share on other sites More sharing options...
x2k.dk Posted June 19, 2011 Share Posted June 19, 2011 did you find your problem? mine is doing the same thing. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted June 20, 2011 Share Posted June 20, 2011 If the second turbo is kicking in the first turbo MUST be making quite good boost, as it's the pressure the first generates that controls the actuation of the second one. Quote Link to comment Share on other sites More sharing options...
x2k.dk Posted June 20, 2011 Share Posted June 20, 2011 well that boost isnt going into the engine because the my boost is only around 0.1-0.2 bar until 4500rpm and after that the 2nd turbo comes in and boosts til 1.2bar Quote Link to comment Share on other sites More sharing options...
mellonman Posted June 20, 2011 Share Posted June 20, 2011 make sure they are both plumbed correctly they may wellbe plumbed for ttc thats why you dont see so much boost from first turbo as they are spooling together just a thought Quote Link to comment Share on other sites More sharing options...
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