Silicone intake hose suggestions - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

mrg666 · 02-12-2021, 04:24 PM

Perrin is selling that little rubber hose for the price of a complete tire. And it makes no difference in performance. Save your money!

gen3v8 · 02-12-2021, 05:04 PM

Quote:

Originally Posted by mrg666

Perrin is selling that little rubber hose for the price of a complete tire. And it makes no difference in performance. Save your money!

Wish I could get a good tire for $160AUD

Grady · 02-12-2021, 06:29 PM

Quote:

Originally Posted by mrg666

Perrin is selling that little rubber hose for the price of a complete tire. And it makes no difference in performance. Save your money!

It is worth it just for the visual aspects! FYI you need to buy better tires.

churchx · 02-12-2021, 08:59 PM

Perrin's tube due different diameter probably needs MAF sensor rescaling. Hmm .. i guess that would be also reason for me to consider stock sized ones instead. Obviously, ecu tune can be retuned to account also that, but still why, if one can avoid extra hassle.

mrg666 · 02-12-2021, 09:21 PM

Quote:

Originally Posted by Grady

It is worth it just for the visual aspects! FYI you need to buy better tires.

I have goodyear eagle f1 on my frs right now. They were $112 on sale. Good enough for me 😉

PulsarBeeerz · 02-12-2021, 11:12 PM

Quote:

Originally Posted by churchx

Perrin's tube due different diameter probably needs MAF sensor rescaling. Hmm .. i guess that would be also reason for me to consider stock sized ones instead. Obviously, ecu tune can be retuned to account also that, but still why, if one can avoid extra hassle.

The tube after the MAF section or their CAI? The MAF doesn't care about the section after the air has passed it..

Cephas · 02-13-2021, 07:20 AM

Quote:

Originally Posted by PulsarBeeerz

The tube after the MAF section or their CAI? The MAF doesn't care about the section after the air has passed it..

Yep. I'm no tuning expert, but the logs I collected after I installed the intake tube didn't show really anything different or out of range.

Grady · 02-13-2021, 09:35 AM

Quote:

Originally Posted by mrg666

I have goodyear eagle f1 on my frs right now. They were $112 on sale. Good enough for me 😉

A Goodyear eagle F1 tire is more expensive than a Perrin intake tube.

churchx · 02-13-2021, 10:47 AM

Quote:

Originally Posted by PulsarBeeerz

The tube after the MAF section or their CAI? The MAF doesn't care about the section after the air has passed it..

I didn't meant their complete CAI. Just their silicone intake hose connecting stock airbox and throttle body, which this thread was about.
Which is of different diameter then stock intake, so i predict that more then possible that changes MAF readings as per same reading now different air volume passes in.

RToyo86 · 02-13-2021, 10:48 AM

I required minor MAF rescaling with the inlet hose, header+OP. It was relatively minor adjust from my understanding. Tomm.brz did my tuning.

Inlet hose is said to he worth 2-4whp. Pretty worthless number but not bad considering most intakes are at best 5whp and cost 3x the price.

PulsarBeeerz · 02-13-2021, 11:36 AM

Quote:

Originally Posted by churchx

I didn't meant their complete CAI. Just their silicone intake hose connecting stock airbox and throttle body, which this thread was about.
Which is of different diameter then stock intake, so i predict that more then possible that changes MAF readings as per same reading now different air volume passes in.

It does not require a re-scale as the housing size doesnt change. The air volume fluctuates all the time due to different throttle inputs and temp swings which is already compensated for in the MAF table. The oem scale has plenty of resolution for a tube as well. I've ran much larger tubes than the Perrin, the maf didn't care it just read higher in some areas.

gpvecchi · 02-13-2021, 04:00 PM

I try argumenting why I'm looking for the same stock shape for hose explaining the theory after the MAF.
MAF sensor works measuring a fraction (let's say 10%) of the quantity of the air passing by its duct; more cold air with more pressure (so more dense) is good.
So, making mods BEFORE sensor to reduce pressure loss (i.e. filter and intake ducts) are good and doesn't need MAF scaling (measure is still 10% of more air).
Mods on MAF housing absolutely need rescaling (if I double the pipe where the MAF sits, it will not still measure 10%, but 5%).
Mods after MAF should THEORICALLY not need rescaling: try thinking of you drinking a coke with a straw that has a MAF sensor on the tip.
The quantity of coke that enters the straw is the same that exits in your mouth.
Using a larger straw with rescaled MAF is the same (but with less effort); using a longer straw is the same (but with more effort).
Using a smooth silicone straw with less bends is the same (but with less effort).
This SHOULD not need rescaling.
Using a longer straw made with metal that passes inside an engine bay, will probably makes you drink hot coke.
As MAF is calibrated on temperature shift too, this probably needs rescaling.
The function of the resonator on the hose is not really clear, Subaru says it's for noise, my butt dyno for low torque. Probably both, and to prevent back pressure waves hit MAF sensor.
That's why I would like to keep stock shape, to have the bigger, shorter and straightest hose possible, but smooth and retaining the resonator.

Cephas · 02-13-2021, 04:23 PM

I get what you're saying, I just think you're over-thinking the difference between the stock tube and the Perrin. The difference in flow isn't zero, of course, but it's well within the margins of the stock MAF and tables to compensate. Like I said, the logs I pulled after I dropped the Perrin in there didn't show anything on the trims that would indicate the need for a MAF rescale. I might do it anyway at some point just to play around, but it won't net me anything really, in terms of performance or efficiency.

PulsarBeeerz · 02-13-2021, 05:37 PM

+1 On the over think. These cars have been out for 8 years now and the tubes have been out for around the same amount of time and not once has MAF rescale for one came up. Stock, Perrin, custom 3.25", I ran and logged them all. The MAF doesn't care. FWIW I'd stick with a stock MY17+ setup as it has a very gentle bend compared to most aftermarket tubes, is already slightly larger than the MY13-16 intake and aesthetically looks better.

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02-12-2021, 08:59 PM	#18
churchx Senior Member Join Date: Mar 2015 Drives: 2014 GT86 Location: Latvia, Riga Posts: 4,333 Thanks: 696 Thanked 2,086 Times in 1,436 Posts Mentioned: 53 Post(s) Tagged: 1 Thread(s)	Perrin's tube due different diameter probably needs MAF sensor rescaling. Hmm .. i guess that would be also reason for me to consider stock sized ones instead. Obviously, ecu tune can be retuned to account also that, but still why, if one can avoid extra hassle.

02-13-2021, 10:48 AM	#24
RToyo86 Senior Member Join Date: Mar 2018 Drives: 17 Asphalt 86 Location: Ottawa Posts: 2,190 Thanks: 1,732 Thanked 2,243 Times in 1,143 Posts Mentioned: 15 Post(s) Tagged: 0 Thread(s)	I required minor MAF rescaling with the inlet hose, header+OP. It was relatively minor adjust from my understanding. Tomm.brz did my tuning. Inlet hose is said to he worth 2-4whp. Pretty worthless number but not bad considering most intakes are at best 5whp and cost 3x the price.

02-13-2021, 04:00 PM	#26
gpvecchi Senior Member Join Date: Mar 2018 Drives: Toyota 86 GT Limited PP (Model G) Location: Italy Posts: 1,018 Thanks: 406 Thanked 335 Times in 187 Posts Mentioned: 14 Post(s) Tagged: 0 Thread(s)	I try argumenting why I'm looking for the same stock shape for hose explaining the theory after the MAF. MAF sensor works measuring a fraction (let's say 10%) of the quantity of the air passing by its duct; more cold air with more pressure (so more dense) is good. So, making mods BEFORE sensor to reduce pressure loss (i.e. filter and intake ducts) are good and doesn't need MAF scaling (measure is still 10% of more air). Mods on MAF housing absolutely need rescaling (if I double the pipe where the MAF sits, it will not still measure 10%, but 5%). Mods after MAF should THEORICALLY not need rescaling: try thinking of you drinking a coke with a straw that has a MAF sensor on the tip. The quantity of coke that enters the straw is the same that exits in your mouth. Using a larger straw with rescaled MAF is the same (but with less effort); using a longer straw is the same (but with more effort). Using a smooth silicone straw with less bends is the same (but with less effort). This SHOULD not need rescaling. Using a longer straw made with metal that passes inside an engine bay, will probably makes you drink hot coke. As MAF is calibrated on temperature shift too, this probably needs rescaling. The function of the resonator on the hose is not really clear, Subaru says it's for noise, my butt dyno for low torque. Probably both, and to prevent back pressure waves hit MAF sensor. That's why I would like to keep stock shape, to have the bigger, shorter and straightest hose possible, but smooth and retaining the resonator.

02-13-2021, 04:23 PM	#27
Cephas Senior Member Join Date: Aug 2018 Drives: 2017 Toyota 86 (860 SE) Location: Dayton, OH Posts: 328 Thanks: 537 Thanked 434 Times in 167 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I get what you're saying, I just think you're over-thinking the difference between the stock tube and the Perrin. The difference in flow isn't zero, of course, but it's well within the margins of the stock MAF and tables to compensate. Like I said, the logs I pulled after I dropped the Perrin in there didn't show anything on the trims that would indicate the need for a MAF rescale. I might do it anyway at some point just to play around, but it won't net me anything really, in terms of performance or efficiency.

02-13-2021, 05:37 PM	#28
PulsarBeeerz Senior Member Join Date: Mar 2017 Drives: JRSC BRZ SOLD Location: Ohio Posts: 934 Thanks: 677 Thanked 739 Times in 396 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	+1 On the over think. These cars have been out for 8 years now and the tubes have been out for around the same amount of time and not once has MAF rescale for one came up. Stock, Perrin, custom 3.25", I ran and logged them all. The MAF doesn't care. FWIW I'd stick with a stock MY17+ setup as it has a very gentle bend compared to most aftermarket tubes, is already slightly larger than the MY13-16 intake and aesthetically looks better.

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