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Old 09-17-2013, 01:01 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.
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Old 09-17-2013, 02:00 PM   #22
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Originally Posted by 18psi View Post
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
Care to share your new VVT map?
Would be nice to see the development, so maybe even compare to the old map?
Thanks!
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Old 09-17-2013, 02:46 PM   #23
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Sure thing, when I get home. Its nothing special, more like a compilation of others' maps with only a few of my own tweaks
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Old 09-19-2013, 03:13 AM   #24
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@18psi - don't come home very often?
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Old 09-19-2013, 10:25 AM   #25
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lol I fail. will try not to forget again today

but in case I forget, here is a quick and very ugly MS paint chop I just made of it from my memory

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Tuning VVT - problem with Oil Temperature-vlad-vvt-table-memory-lol.png  

Last edited by 18psi; 09-19-2013 at 10:43 AM.
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Old 09-19-2013, 02:02 PM   #26
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Quote:
Originally Posted by Savington View Post
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.
Have you experimented with low vs high overlap during cruise, and look at MPG's?
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Old 10-02-2013, 12:57 PM   #27
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Minor update,

I ended up taking out that 12* at 90kpa/2800rpm due to cold oil bucking as well.

Now the car feels great cold and warm.
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