S4 / RS4 (B5 Platform) Discussion Discussion forum for the B5 Audi S4 & RS4 produced from 1998-2002

Does SEL do the "exact" same thing as a boost controller?

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Old 11-30-2005, 12:09 PM
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Default

BTDT, too....with no changes. Narrowband sensors just aren't accurate enough...
Old 11-30-2005, 12:14 PM
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Default have you tried cranking the boost way up and dialing it back down w/ SEL?

just trying to compare notes.
Old 11-30-2005, 12:16 PM
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Default I adjust boost ~.5 bar up/down when going to/from the track. I've never played with SEL on my car...

because I'm MBC only.
Old 11-30-2005, 12:18 PM
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Default So SEL adjusts boost through the N75 only?

and thus, changes w/ SEL once MBC only will do jack, correct?
Old 11-30-2005, 12:23 PM
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Default Actual boost won't change if you adjust SEL scaling while running MBC only.

That's why some people play with SEL scaling to eliminate negative deviation code when running XR+MBC only+TCD homebrew setup. Actual boost stays the same, but the requested curve changes. They try to fit the requested curve to the TCD's clamped setting better. With that said, I don't recommend trying this as you may induce TC up top due to positive boost deviation...just using this as an example of SEL changing and actual staying the same.
Old 11-30-2005, 12:31 PM
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Default Is the only reason people don't use MBC in parallel w/ fueling setups...

is for the quicker boost response? ie less lag?

I very much like the smooth ramp of the parallel setup and would be curious to see if it was the same when fueling is involved.

Would FATS or 60' times be slower w/ a parallel setup?
Old 11-30-2005, 12:35 PM
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Default Many say ramp up is better and taper is less. I have nothing to prove this, but love MBC only.

The drivability is great for my driving style. Others have complained about it in the past, but my car is butter smooth.
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