M7WSY Posted July 17, 2014 Share Posted July 17, 2014 Running a CT9 hybrid with supporting mods.its all been mapped,no leaks anywhere as far as I know and only thing left to do is electronic boost controller, as for spool up it's painfully slow, starts spooling about 2.8 - 3.4 k revs and hits full boost at about 4.7 - 5.0 k revs at about 16 - 18 psi roughly. There is no actuator as I have an external waste gate which the diaphragm is fine and the correct springs are in,anybody else had this problem? Quote Link to post Share on other sites
Ollieh17 Posted July 17, 2014 Share Posted July 17, 2014 Was it like that when mapped? Quote Link to post Share on other sites
M7WSY Posted July 17, 2014 Author Share Posted July 17, 2014 As far as I know yes,was done when I bought the car and as far as I know the only main thing still to be done was the electronic boost controller,but I can't see the boost controller bringing the spool up time down that much? Quote Link to post Share on other sites
Gainzy Posted July 17, 2014 Share Posted July 17, 2014 Must be losing pressure somewhere DV maybe double check all the gaskets and pipe's what's you boost gauge doing? Quote Link to post Share on other sites
M7WSY Posted July 17, 2014 Author Share Posted July 17, 2014 Haven't got a dump valve on either,pretty sure all gaskets are ok but I'm going to strip it and put new gaskets in,what u mean boost gauge?guessing you mean spooling time?peaks at about 17psi but only starts spooling up about 2.8 revs and struggles untill higher revs Quote Link to post Share on other sites
Ollieh17 Posted July 17, 2014 Share Posted July 17, 2014 Definetly a leak somewhere i reckon. Any shaft play on the turbo? Use the trick socks mentioned on herr. Removed air filter and block up the turbo inlet. If the car cuts out you have no boost leak, if it doesnt you should hear it Quote Link to post Share on other sites
M7WSY Posted July 17, 2014 Author Share Posted July 17, 2014 Very very slight play on the turbo shaft but nothing to worry about,my air filter is straight onto the turbo inlet,so the car should cut out?if not it's a boost leak correct? Quote Link to post Share on other sites
Ollieh17 Posted July 17, 2014 Share Posted July 17, 2014 Take the air filter off And block the inlet with your hand or a piece of plastic and see if the car cuts out Quote Link to post Share on other sites
Gainzy Posted July 17, 2014 Share Posted July 17, 2014 If your climing revs and holding boost all the way through without dropping off I don't think it's a boost leak it might be worth adjusting your TPS on the inlet mani, it may not be opening on time fully, the compressed air maybe getting pushed back onto the turbo then fully opening it's just a hunch though read your boost gauge at high revs look for any boost drop off you don't need to use a dumpvalve but it does take pressure off the turbo. What boost are you running (spring) Quote Link to post Share on other sites
Ollieh17 Posted July 17, 2014 Share Posted July 17, 2014 How well has the turbo wastegate penny been welded to accomadate the wastegate? Quote Link to post Share on other sites
mikey4410 Posted July 17, 2014 Share Posted July 17, 2014 Funnily enough I have just gone over to ct9 hybrid with external wastegate dude. I get boost start at 2,500 and full boost of 17psi @ around 3,500 Quote Link to post Share on other sites
mikey4410 Posted July 17, 2014 Share Posted July 17, 2014 And as above has ure penny been welded.what wastegate spring you got in there ? Quote Link to post Share on other sites
M7WSY Posted July 17, 2014 Author Share Posted July 17, 2014 Sorry guys what do you mean by penny?no idea what spring is in but it's holding boost at 16-18 psi,and yeah my boost is dropping off at the top of the rev range,just done a check and there is no boost leaks what so ever Quote Link to post Share on other sites
M7WSY Posted July 18, 2014 Author Share Posted July 18, 2014 Anybody else got any ideas? Quote Link to post Share on other sites
ste91 Posted July 18, 2014 Share Posted July 18, 2014 Are you sure it's not wastegate creep? If your wastegate has a weak spring for example, it might be set for lets say 15 psi but the force of the exhaust gas is enough to crack it open at 10 psi, so those last few psi rise very slowly as the gas is bypassing the turbine instead of continuing to spool it up. A boost controller can usually fix this problem, as the actuator will see no boost at all until it reaches whatever the boost controller is set at. As per the original example, if your boost controller is set to 15 psi, it will stay shut until it reaches 15 psi and then it will open and allow boost pressure to pass to your wastegate actuator. Quote Link to post Share on other sites
mark1991 Posted July 23, 2014 Share Posted July 23, 2014 spoke on FB, the penny was only tack'd to the exhaust housing and its snapped the weld! me and gary91 will be helping him out as he is pritty close to us Quote Link to post Share on other sites
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