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DCIs vs stock filter vs modified filter boxes..the results are in

Specific discussion about the E89 2009 Z4 (sDrive35is, sDrive35i, sDrive30i, sDrive23i)
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B21
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DCIs vs stock filter vs modified filter boxes..the results are in

Post by B21 » Fri Aug 25, 2023 12:47 pm

Another day on the dyno…

This time we tested the impact of DCIs vs the other things already tried.

Two charts..

The one with 5 lines shows a circa 500 BHP tune with various airbox / filter / DCI options ..

The one with 3 lines shows our latest tune V17 (iteration 19)..with Mr.5 mod and DCI..the other line is an earlier tune V13+ which unfortunately had a few too many ignition timing corrections for my tuners approval.

Net result DCIs consistently show an increase in peak torque probably due to the removal of interfering effects of pulses in the air intakes..these merge destructively in the airbox but dissipate in the open engine bay..

Peak power not significantly affected especially on 500 BHP and under levels
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Last edited by B21 on Fri Aug 25, 2023 2:17 pm, edited 2 times in total.
We choose to go to on with this endeavour at this time and do the other things, not because they are easy, but because they are hard…
A very modified Atacama Yellow 35is :thumbsup: Previously a slightly less modified Atacama Yellow 20i MSport :thumbsup:

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jock156
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DCIs vs stock filter vs modified filter boxes..the results are in

Post by jock156 » Fri Aug 25, 2023 1:04 pm

First 2 images didn’t load mate :(

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B21
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DCIs vs stock filter vs modified filter boxes..the results are in

Post by B21 » Fri Aug 25, 2023 2:17 pm

jock156 wrote: Fri Aug 25, 2023 1:04 pm First 2 images didn’t load mate :(
Joys of the antique forum software..resubmitted via a different format
We choose to go to on with this endeavour at this time and do the other things, not because they are easy, but because they are hard…
A very modified Atacama Yellow 35is :thumbsup: Previously a slightly less modified Atacama Yellow 20i MSport :thumbsup:

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