silicone intake boots

zukrider · 08-08-2022, 07:20 AM

opinions vs stock, is the resonator on the stock boot just for sound?

CTinline-six · 08-08-2022, 08:11 AM

I have a silicone boot on my E90 328i. There is a bit more sound at WOT (barely noticeable) and slightly better throttle response (less pedal lag). I wouldn't expect any crazy gains, but for how cheap they are I think it is a worthwhile mod.

The Nightman · 08-09-2022, 03:40 PM

It's a Helmholtz resonator to smooth airflow and yield better mid-range power at partial throttle. Unfortunately no proof from BMW, but lots of references from other manufacturers documenting the use of similar resonators for those purposes. It seems that BMW adds additional resonators for sound tuning. Eg the Z4 intake hose has an additional "sound generator" branch for more induction noise, while the E60 has an extra resonator presumably for noise reduction.

I had both and went back to the stock hose after my butt dyno felt it was more responsive in daily driving conditions. People keep claiming the silicone hose is dyno proven but I've yet to see an actual dyno graph. I would rather have more usable mid-range power than an insignificant increase in peak power.

https://www.e90post.com/forums/showp...34&postcount=8
https://www.e90post.com/forums/showp...5&postcount=17

08-08-2022, 07:20 AM	#1
zukrider Private 7 Rep 61 Posts Drives: e90 Join Date: Jul 2015 Location: Atlanta iTrader: (0)	silicone intake boots opinions vs stock, is the resonator on the stock boot just for sound?
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08-08-2022, 08:11 AM	#2
CTinline-six Hoonigan 6846 Rep 3,000 Posts Drives: '09 328i, '98 Wrangler Join Date: Dec 2016 Location: Connecticut iTrader: (0) Garage List 2009 BMW 328i N51 [0.00]	I have a silicone boot on my E90 328i. There is a bit more sound at WOT (barely noticeable) and slightly better throttle response (less pedal lag). I wouldn't expect any crazy gains, but for how cheap they are I think it is a worthwhile mod. __________________ "Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should." -Dr. Ian Malcolm, Jurassic Park
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08-09-2022, 03:40 PM	#3
The Nightman Cometh 1090 Rep 1,305 Posts Drives: Boy's Soul Join Date: Jul 2016 Location: Boy's Hole iTrader: (4) Garage List E90 LCI "330i& ... [10.00]	It's a Helmholtz resonator to smooth airflow and yield better mid-range power at partial throttle. Unfortunately no proof from BMW, but lots of references from other manufacturers documenting the use of similar resonators for those purposes. It seems that BMW adds additional resonators for sound tuning. Eg the Z4 intake hose has an additional "sound generator" branch for more induction noise, while the E60 has an extra resonator presumably for noise reduction. I had both and went back to the stock hose after my butt dyno felt it was more responsive in daily driving conditions. People keep claiming the silicone hose is dyno proven but I've yet to see an actual dyno graph. I would rather have more usable mid-range power than an insignificant increase in peak power. https://www.e90post.com/forums/showp...34&postcount=8 https://www.e90post.com/forums/showp...5&postcount=17
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