Tuning VVT - problem with Oil Temperature
09-17-2013, 12:01 PM
#21
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I typically tune the VVT so that it doesn't start advancing until around 50kpa. The additional overlap at low throttle openings where there isn't much intake velocity and flow causes reversion in the intake manifold, just like having huge cams would cause reversion at lower RPM. Sounds pretty bitchin', but it doesn't drive so nice (kind of like a huge set of cams 
)
Huge improvements in low-speed driveability by leaving it at zero advance until higher throttle/RPM is used.
)Huge improvements in low-speed driveability by leaving it at zero advance until higher throttle/RPM is used.
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09-17-2013, 01:00 PM
#22
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Join Date: Mar 2006
Location: Schwarzenberg, Germany
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Amen.
I actually learned this just yesterday/today. Took out a bunch of advance below 3k and voila - this morning it drives like a peach even when cold. Well, that plus I reduced my accel enrichment pump settings and set tps/map blend to 80%
I guess I was silly in thinking this ancient BP likes lowend vvt advance like the subaru's and evo's I tuned using this logic. Lots of lowend intake cam advance - feels like a big 'ol motor and is just pleasant around town. The BP simply responds with "Nope, I'm not doin that"
lol
I actually learned this just yesterday/today. Took out a bunch of advance below 3k and voila - this morning it drives like a peach even when cold. Well, that plus I reduced my accel enrichment pump settings and set tps/map blend to 80%
I guess I was silly in thinking this ancient BP likes lowend vvt advance like the subaru's and evo's I tuned using this logic. Lots of lowend intake cam advance - feels like a big 'ol motor and is just pleasant around town. The BP simply responds with "Nope, I'm not doin that"
lol
Would be nice to see the development, so maybe even compare to the old map?
Thanks!
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09-19-2013, 01:02 PM
#26
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Join Date: Jul 2005
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I typically tune the VVT so that it doesn't start advancing until around 50kpa. The additional overlap at low throttle openings where there isn't much intake velocity and flow causes reversion in the intake manifold, just like having huge cams would cause reversion at lower RPM. Sounds pretty bitchin', but it doesn't drive so nice (kind of like a huge set of cams )
Huge improvements in low-speed driveability by leaving it at zero advance until higher throttle/RPM is used.
)Huge improvements in low-speed driveability by leaving it at zero advance until higher throttle/RPM is used.
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