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| Boost drop off http://www.gt4dc.co.uk/forum/viewtopic.php?f=1&t=7207 |
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| Author: | clu7ch [ Fri Oct 31, 2014 9:15 pm ] |
| Post subject: | Boost drop off |
Hey guys just had a question about a possible boost leak on my 185. Currently I have a turbosmart manual boost controller installed and set to 14-15 psi (~1bar). I am able to easily hit the full 15 psi of boost...however, by the time I hit red line I am down to about 7 psi(~.5bar). Right now I am running the stock ct26 turbo and all of the connections to the inter cooler are tight. My thoughts are that either the blow off valve is leaking under the higher pressure or that the waste get is opening due to the increased boost pressure....any other thoughts as to what might be causing this? Thanks in advance. |
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| Author: | Sunny [ Sun Nov 02, 2014 11:51 pm ] |
| Post subject: | Re: Boost drop off |
Hi, sounds like the turbo is not able to delivery any more air, when the point is reached where it drops down try 0,7bar or something else and look for it again.... greetz |
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| Author: | clu7ch [ Mon Nov 03, 2014 5:30 pm ] |
| Post subject: | Re: Boost drop off |
Sunny wrote: Hi, sounds like the turbo is not able to delivery any more air, when the point is reached where it drops down try 0,7bar or something else and look for it again.... greetz Worth a shot thanks for the idea |
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| Author: | TrackToyFour [ Tue Nov 04, 2014 12:31 pm ] |
| Post subject: | Re: Boost drop off |
In addition to Sunny's suggestion, have you pressure tested the actuator to confirm it is working to specification? Also worth checking the wastegate spindle to make sure it's moving freely and not partly stuck open. You are running a downpipe so there should be no downstream restriction to the exhaust gas flow which could cause the compressor to 'choke' at higher rpm. |
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| Author: | clu7ch [ Tue Nov 04, 2014 5:28 pm ] |
| Post subject: | Re: Boost drop off |
I haven't pressure tested the actuator yet but when I remove the manual boost controller and go off of the wastegate spring pressure I run a constant 5 psi boost. I am pretty sure the spindle is moving freely but I will double check its movement. Thanks |
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| Author: | Nibbles [ Tue Nov 04, 2014 11:10 pm ] |
| Post subject: | Re: Boost drop off |
Double check the vac pipe from the inlet manifold to the top of the dump valve is present and not blocked / kinked. Without this, the DV will act as a pressure relief valve. |
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| Author: | mixer72 [ Thu Dec 18, 2014 3:10 pm ] |
| Post subject: | Re: Boost drop off |
if you still running a stock ct26 then the boost will not hold any more then .8bar over 5-5.5krpm it will spool upto 1-1.2bar be for 5k but the nit just can not flow after 5-5.5k and this is why it drops off, |
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