dr20t wrote:alexeiwoody wrote:dr20t wrote:Thanks for the links
Anyone know whether target boost tables have an influence on dbw / throttle maps when I'm running stand alone ebc?
They do. However not in the way you're concerned about.
You won't experience boost fluctuations or engine misbehaviour, it will only affect your TCU, ie gear shifting.
Thanks Aladdin but are you certain about that?
Load is calculated off various sensors (including maf and map) but I can't help but have a "gut feel" that throttle position and therefore dbw have an impact on load. Therefore by extension anything impacting the throttle tables (such as target boost even when not used to control boost) will have an impact on ecu calculated engine load.
Taking this further, if true, then this would affect timing and fueling at that load/ rev range given the primary open loop and timing base tables are based on load (not static load but rather calculated load from the above parameters)
Am I way off track here?
Mick
Hahaha Alladin
I drove around for a while on some really stupid target boost tables (nearly the whole table of 20s, trying to see how fast we can make boost), while the boost controller was connected and also disconnected (running a manual controller at the time). No engine stumble, no surging, no misbehaving at all.
The only noticeable difference now that I'm using the ECU boost control and the target boost is set up in a sensible shape - the gearbox sees 'correct load', will drop gears more readily on deceleration and shifts smoother all around.
If you have any doubts, just set your target boost as close as you can to your actual boost. IMO it won't help your issue, but might be more predictable to drive if tables are currently way off.
If you want to see the other extreme - wherever in the target boost tables that your lib is normally on boost - change those values to be all max boost (whatever you're running). You'll notice on fast deceleration from 100/80 to a stop, the 5eat will want to stay in higher gear and will fight you with the brakes. Mine was as bad as staying in 3rd even as my speedo hit 0, then clunking through two gears while the brakes were fighting against the loaded driveshafts.
IMO if it was your Trgt Boost, you and Rome would have noticed on your old setups.
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