Guest RZtt Posted February 27, 2010 Share Posted February 27, 2010 (edited) Hey guys got a problem with boost hope someone can help me out. Had the car on dyno last night and we set the boost at 17psi. It goes up to 18psi the drops back to between 14-15psi. It seem likes something not letting the boost to hold steady. Cant work out what causing the boost to drop. Could it be my actuator that not letting the boost to hold? When i was running JDM twins i had the same problem and never actually got around to fix it cause I did USDM turbo conversion. And now the same problem after completing the conversion. Mods on the turbo side: USDM twins Power Fc Greddy Ls intercooler Ported manifold Ported egcv Apexi Avrc boost controller kakimoto catback exhaust with hiflow cat 3"custom mid pipe 3" custom dump pipe Edited February 28, 2010 by RZtt (see edit history) Quote Link to comment Share on other sites More sharing options...
imi Posted February 27, 2010 Share Posted February 27, 2010 Perhaps a Boost Leak. Quote Link to comment Share on other sites More sharing options...
Guest RZtt Posted February 27, 2010 Share Posted February 27, 2010 Perhaps a Boost Leak. We had a quick check and didn't spot any boost leak Quote Link to comment Share on other sites More sharing options...
Guest RZtt Posted February 28, 2010 Share Posted February 28, 2010 Here is my old dyno graph was done when i was running JDM twins. As you see it hits 1.35 bar then starts to drop off to 1.05 bar. Will get new dyno graph next week http://img145.imageshack.us/img145/2626/dynosheetp.jpg Quote Link to comment Share on other sites More sharing options...
kaahari Posted February 28, 2010 Share Posted February 28, 2010 (edited) Exactly same when i got broken pressure hose in sequential system. It let some pressure to 2.nd turbo actuators but they newer opened fully... Edited February 28, 2010 by kaahari (see edit history) Quote Link to comment Share on other sites More sharing options...
Guest RZtt Posted February 28, 2010 Share Posted February 28, 2010 Exactly same when i got broken pressure hose in sequential system. It let some pressure to 2.nd turbo actuators but they newer opened fully... sorry I'm not very good with car parts. Where abouts is this pressure hose located? Quote Link to comment Share on other sites More sharing options...
kaahari Posted February 28, 2010 Share Posted February 28, 2010 (edited) sorry I'm not very good with car parts. Where abouts is this pressure hose located? Read that link first It could be VSV, actuator or hose... all things have to be in order to 2.nd turbo work correctly. These are quite a lot of hoses in the system! :d:d http://www.mkivsupra.net/vbb/showthread.php?t=35926 But... it can be loost leak also, because your boost raises fine when 2.nd turbo kicks in. It can be difficult to find, if it leaks only on full boost Edited February 28, 2010 by kaahari (see edit history) Quote Link to comment Share on other sites More sharing options...
Guest RZtt Posted February 28, 2010 Share Posted February 28, 2010 Thank you Quote Link to comment Share on other sites More sharing options...
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