Easy/Inexpensive Intake Sound Upgrade

[86MLR]

Originally Posted by Scala

+1 but most people prefer to fool themselves.

And yet it didn't effect mine.

You do know resonators are designed to muffle sound frequencies, that's why there are so many, at the snorkle, airbox an induction pipe.

Lots of R&D went into these little tanks IRT having the vehicles noise level compliant.

But, as always, opinions may vary.

[Scala]

So you removed all the "little tanks" and this "didn't effect" your car?
No documented power loss or gain or sound change?

Did you do other modifications at the same time or just that?

[re-animator]

Originally Posted by Scala

So you removed all the "little tanks" and this "didn't effect" your car?
No documented power loss or gain or sound change?

Did you do other modifications at the same time or just that?

mishimoto posted some numbers that came when they messed with the resonator while designing their intake let me see if i can find it...


turns out removing the resonator actually hurts power:

https://www.ft86club.com/forums/showthread.php?t=61621

[Lincoln Logs]

Originally Posted by 86MLR

And yet it didn't effect mine.

You do know resonators are designed to muffle sound frequencies, that's why there are so many, at the snorkle, airbox an induction pipe.

Lots of R&D went into these little tanks IRT having the vehicles noise level compliant.

But, as always, opinions may vary.

Did you A/B/A test your results on a dyno? Do you have data backing this claim? Intake design is far more complicated than it ever was. Yes, part of the job for those chambers is to reduce noise but their primary job is to improve the volumetric efficiency of the intake and improve power. Check out the article HERE for more information on this subject.

The factory intake system on most cars are so well designed at this point, it isn't rocket science why aftermarket intakes don't work. Look at most intake systems for this car, they "improve" power slightly on a dyno but in the real world transient throttle response turns to garbage. Hard for a straight piece of pipe to emulate a computer designed and engineered system of resonance chambers to ensure smooth airflow across the MAF.

[Scala]

Thank you re-animator.

Exactly my experiences and those of other Miata NA/NB racers and countless dyno tests. You remove the Helmhotz chamber and you pay for it.

[86MLR]

Originally Posted by Lincoln Logs

Did you A/B/A test your results on a dyno? Do you have data backing this claim? Intake design is far more complicated than it ever was. Yes, part of the job for those chambers is to reduce noise but their primary job is to improve the volumetric efficiency of the intake and improve power. Check out the article HERE for more information on this subject.

The factory intake system on most cars are so well designed at this point, it isn't rocket science why aftermarket intakes don't work. Look at most intake systems for this car, they "improve" power slightly on a dyno but in the real world transient throttle response turns to garbage. Hard for a straight piece of pipe to emulate a computer designed and engineered system of resonance chambers to ensure smooth airflow across the MAF.

Didn't dyno.

Generally when I do something I see how my 0 - 100 goes.

Both the dyno and the 0-100 have inherent flaws though.

As for the resonator on the intake tube, opinions and results vary, you say it looses power others say it doesn't, why wouldn't the TRD airbox have one?

I'm not buying it, especially when dyno results are brought up, I've seen so much variation over the years, trying to pick one or 2 horsepower isn't going to be repeatable, you can fudge the graph quite easily though to give you any result you want.

IMO dynos are for tuning and circlejerks, 0-100 and the 1/4 mile will tell the truth.

I'm just posting my findings.

Enjoy

[Lincoln Logs]

Originally Posted by 86MLR

Didn't dyno.

Generally when I do something I see how my 0 - 100 goes.

Both the dyno and the 0-100 have inherent flaws though.

As for the resonator on the intake tube, opinions and results vary, you say it looses power others say it doesn't, why wouldn't the TRD airbox have one?

I'm not buying it, especially when dyno results are brought up, I've seen so much variation over the years, trying to pick one or 2 horsepower isn't going to be repeatable, you can fudge the graph quite easily though to give you any result you want.

IMO dynos are for tuning and circlejerks, 0-100 and the 1/4 mile will tell the truth.

I'm just posting my findings.

Enjoy

Dynos are not perfect tools and they are often used incorrectly for testing. Real dyno testing needs to happen with the car strapped to the dyno and you make changes to the car right there and test again. The way you strap a car down on the dyno can effect numbers so even coming back the next day to the same dyno can skew results.

Resonance chambers are not always required if the design is correct. I suspect the design of the TRD box accounts for that, those folks know a thing or two. Keep in mind that the TRD airbox fits to the factory snorkle which has resonance chambers on it as well, so it doesn't lose all of them.

[86MLR]

From here > http://www.ft86club.com/forums/showt...=129897&page=3

[vandemo1133]

I have the perrin intake with a perrin inlet tube and doesn't make that suction noise that people talk about for some reason. Is it possible it was installed wrong? Does clamping or loosening the clamps a bit contribute to a better sound at all?

[tomm.brz]

the Perrin CAI?

[vandemo1133]

Originally Posted by tomm.brz

the Perrin CAI?

Yes sir!

[Mr_Eyo]

Is there a noticeable under the hood induction nsound change going from stock to sound tube delete?

[Yoshoobaroo]

Originally Posted by Mr_Eyo

Is there a noticeable under the hood induction nsound change going from stock to sound tube delete?

In my opinion no. But that varies greatly depending on who you ask. Unplug it at the firewall and go for a drive, it's really easy.

[churchx]

Simplest is to not unplug anything. Just plug hole from inside cabin with reusing second ciglighter socket plug from glovebox. No need to buy anything or even lifting hood to just test of how it's w/o soundtube. It's very subjective feel, but with 100% stock exhaust by i had wrong & subjective feel car becoming weaker/limp a bit, so stayed with that soundtube left functional. Probably wouldn't need to, if i had aftermarket exhaust.