Reason for 4 intake resonators? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

ahausheer · 06-08-2012, 01:44 AM

Recently it has come to my attention that the FR-S/BRZ has 4 intake resonators. I wanted to ask the community for insight into why there are 4. Two are larger bottle like shapes and 2 are small branch resonators, one of the larger ones appears to be on the engine side of the MAF. Do you guys think these are simply for noise control or do they play a role in tuning the intake pressure waves or is it something else. ?

Perhaps this car was designed by committee (

).

Dimman · 06-08-2012, 02:07 AM

Quote:

Originally Posted by ahausheer

Recently it has come to my attention that the FR-S/BRZ has 4 intake resonators. I wanted to ask the community for insight into why there are 4. Two are larger bottle like shapes and 2 are small branch resonators, one of the larger ones appears to be on the engine side of the MAF. Do you guys think these are simply for noise control or do they play a role in tuning the intake pressure waves or is it something else. ?

Perhaps this car was designed by committee (

).

Errr... both?

There is some fancy acoustic (pressure wave) tuning involved to get the big boost of torque they manage at the low rpm hump and still pull decently up top. If you look at Perrin's dyno that got them the 4 lb-ft gains up top, you can see they lost about the same or more at the low hump.

Tainen · 06-08-2012, 02:49 PM

I think there's a good market opportunity for a company to come out with a set of caps to replace all the resonators and the sound generator... I'd buy it.

Gardus@Supersprint · 06-08-2012, 05:56 PM

If you keep it NA: stay with the stock intake / airbox

If you go FI: fit a CAI with a bigger filter unit

06-08-2012, 01:44 AM	#1
ahausheer Re-member Join Date: Nov 2011 Drives: Toyota camry Location: S. Cali Posts: 1,001 Thanks: 98 Thanked 292 Times in 152 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Reason for 4 intake resonators? Recently it has come to my attention that the FR-S/BRZ has 4 intake resonators. I wanted to ask the community for insight into why there are 4. Two are larger bottle like shapes and 2 are small branch resonators, one of the larger ones appears to be on the engine side of the MAF. Do you guys think these are simply for noise control or do they play a role in tuning the intake pressure waves or is it something else. ? Perhaps this car was designed by committee (). __________________ Nothing decays like progress, and nothing preserves like neglect.

06-08-2012, 02:49 PM	#3
Tainen Senior Member Join Date: Nov 2011 Drives: First SWP BRZ-L Location: Washington Posts: 809 Thanks: 154 Thanked 350 Times in 174 Posts Mentioned: 11 Post(s) Tagged: 0 Thread(s)	I think there's a good market opportunity for a company to come out with a set of caps to replace all the resonators and the sound generator... I'd buy it. __________________ First white BRZ in the country Limited SWP BRZ, 35% tint, clear bra, Nameless Performance downpipe, axelback, headers

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06-08-2012, 05:56 PM	#4
Gardus@Supersprint Banned Join Date: Nov 2011 Drives: Clio TCE Location: Mantova - Italy Posts: 494 Thanks: 17 Thanked 154 Times in 70 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	If you keep it NA: stay with the stock intake / airbox If you go FI: fit a CAI with a bigger filter unit

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