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Techsalvager
Joined: 21 Jun 2011
Posts: 140
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 Posted: Tue May 08, 2012 2:05 pm Post subject: truck with boost and vct |
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working on chevy truck with the 6l motor that has vct and has been boosted.
I'm going over for boost leaks but I'm wondering if anyone has dealt with the ls series vct and turbos. around 4800 boost drops down no matter what from the target to around 3-2 psi to 6k rpms. The cam timing iirc advances. Using a diablosport trinty and have no cam timing based options or a way to lock the cam in a static position to test.
Has anyone else dealt with such instances?
Possible a blown gasket or etc, which I'm checking for now. |
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Roberto Arano
Joined: 22 Nov 2005
Posts: 361
Location: colorado
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StantonWarrior
Joined: 10 Dec 2010
Posts: 188
Location: UK
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| Posted: Wed May 09, 2012 3:00 am Post subject: |
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| Can you log actuations and events through OBD, and see what is happening as boost drops? |
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Techsalvager
Joined: 21 Jun 2011
Posts: 140
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| Posted: Wed May 09, 2012 9:49 pm Post subject: |
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open boost control, just external wastegate and boost controller.
I have some log data showing what is happening to the intake cam but I can't bring in above atmo pressure into the same data. |
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StantonWarrior
Joined: 10 Dec 2010
Posts: 188
Location: UK
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| Posted: Thu May 10, 2012 12:31 am Post subject: |
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| Im not familiar with that engine at all, so cant comment on the exact strategy used, but if its advancing the intake cam around when boost drops, you could unplug the solenoid to keep the cam in a fixed position.....to rule it out more than anything. |
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Techsalvager
Joined: 21 Jun 2011
Posts: 140
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| Posted: Mon May 14, 2012 4:55 pm Post subject: |
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variable cam timing was effecting boost.
disabled boost stayed just fine. |
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Roberto Arano
Joined: 22 Nov 2005
Posts: 361
Location: colorado
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| Posted: Mon May 14, 2012 7:49 pm Post subject: |
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| Techsalvager wrote: | variable cam timing was effecting boost.
disabled boost stayed just fine. |
?there was a VE change because boost control was not closed loop,yes?
what happens if you keep the variable cam timing and run closed loop boost in order to keep the boost constant with the increased VE, you may/will pick up hp if all else will allow it.
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http://stores.ebay.com/Circuit-Se7en |
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Techsalvager
Joined: 21 Jun 2011
Posts: 140
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| Posted: Tue May 15, 2012 9:06 pm Post subject: |
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| Currently I don't have a way to do closed loop boost control and reguardless of turning up the boost, it falls back to the same ammount up top. |
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Roberto Arano
Joined: 22 Nov 2005
Posts: 361
Location: colorado
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| Posted: Wed May 16, 2012 9:26 am Post subject: |
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A simple high quality manual boost control with the pilot line attached to the manifold (rather than compressor outlet) will provide closed loop boost control. PM if you want one I have some.
_________________
www.circuitse7en.net
http://stores.ebay.com/Circuit-Se7en |
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