Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB - View Single Post - Has anyone deleted the resonator in the stock airbox? or made a larger snorkel?

Kodename47 · 05-10-2013, 06:22 PM

@vtmike here's the results. All done in 1 hour, same map (Litchfield tune), same roads and each individual pull done at the same part of road. 2x 3rd gear and 1x 4th gear full throttle pulls. Closed is with the main resonator hole blocked, resonated is with the main resonator in use, open is with the hole open into the engine bay. The stock snorkel is in use.

MAF:

AFR:

MAP:

What this does show quite clearly is that, even with the same airbox and MAF location, changing something as small as the resonator impacts on the airflow readings. This can be seen in certain areas and the resultant AFR changes. It's clear that no more air is being used, yet some areas are leaning out and that correlates with lower MAF readings. TBH, I included the MAP graphs but I'm not 100% sure how to interpret them.

I'm yet to determine whether the ECU could learn and adapt to these changes which are really visible in the range I mentioned previously. Obviously a remap for each config would mean that the hesitation I was experiencing would go away (like @NickFRS), but I'm not sure that any particular config is "best" for performance. I also don't seem to lose any noticeable sound through using the resonator.

I've been temped to design a 2nd feed (or snorkel if you will) that uses the resonator port and snakes across the bay to a cold air pocket but again, I fear that this may not gain much, if anything.

05-10-2013, 06:22 PM	#295
Kodename47 Senior Member Join Date: Oct 2012 Drives: UK GT86 Location: UK Posts: 3,040 Thanks: 185 Thanked 1,633 Times in 1,113 Posts Mentioned: 156 Post(s) Tagged: 1 Thread(s)	@vtmike here's the results. All done in 1 hour, same map (Litchfield tune), same roads and each individual pull done at the same part of road. 2x 3rd gear and 1x 4th gear full throttle pulls. Closed is with the main resonator hole blocked, resonated is with the main resonator in use, open is with the hole open into the engine bay. The stock snorkel is in use. MAF: AFR: MAP: What this does show quite clearly is that, even with the same airbox and MAF location, changing something as small as the resonator impacts on the airflow readings. This can be seen in certain areas and the resultant AFR changes. It's clear that no more air is being used, yet some areas are leaning out and that correlates with lower MAF readings. TBH, I included the MAP graphs but I'm not 100% sure how to interpret them. I'm yet to determine whether the ECU could learn and adapt to these changes which are really visible in the range I mentioned previously. Obviously a remap for each config would mean that the hesitation I was experiencing would go away (like @NickFRS), but I'm not sure that any particular config is "best" for performance. I also don't seem to lose any noticeable sound through using the resonator. I've been temped to design a 2nd feed (or snorkel if you will) that uses the resonator port and snakes across the bay to a cold air pocket but again, I fear that this may not gain much, if anything. __________________ .: Stealth 86 :. Abbey Motorsport/K47 Tuned Sprintex 210 Supercharger Kodename 47 DJ: Soundcloud / Instagram / Facebook Last edited by Kodename47; 05-10-2013 at 07:40 PM.