TRD Intake ! CAI ?!

[Thorpedo]

Originally Posted by Kodename47

The ECU will obviously adapt to a certain extent anyway after a reset which I believe is recommended in the install instructions?

This is where my knowledge of the D4-S system runs a tad thin. I believe this to be correct, but I cannot say with all certainty. I know it does call for a reset as vtmike says.

To be honest when I said "firm" it was a tad misleading. I am working with a university and said information is their property given I am being paid to aid with research. Silly politics...

One thing to consider, because all of the bends in the stock setup it is more restrictive, thus creating more friction and heat decreasing the airflow because of less dense air coming in. Something that hints at this is the stock airbox has air straighteners to reduce turbulence at the maf, while the trd has none.

The friction of the air on itself and the surrounding intake does little to create heat, but you're spot on with the air straighteners. At this point it seems to me that they may have originally designed the car with something similar to the TRD unit, then designed the actual stock unit to accommodate the sound generator and create a situation where flow can be slightly improved for only XXX dollars! The air straighteners were required for a somewhat reliable MAF reading yet still resulted in an arguably rich running condition.

Obviously that is only speculation... but the TRD intake definitely results in an income stream and only helps with hype for the car.

[vtmike]

I found it interesting there was already a hole in the support at the front of the car for the grommet. Almost like it was planned from the beginning or something.

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[Red2Liter]

I've been sitting these discussions out for a few weeks while I just enjoyed driving my BRZ. I assumed that the OEM intake with the soundtube couldn't help but affect the total intake picture. The TRD intake looked good to me based on two things 1) the intake path was cleaner and more direct and 2) the CABox & filter were significantly bigger. It's true that one of the limits on airflow is the size of the OEM intake in the front of the nose, but I suspect the larger volume of the TRD box may be advantageous when you dump the throttle and the engine asks for a rapid input of air. Might not the larger volume box serve as a reservoir for air under those conditions? It's gratifying to see that some are measuring small HP gains with the TRD box and I've experienced a much more linear throttle response with mine. I believe that it's also passing more air too. This is suggested to me by a slightly lower fuel economy since I made the install. My train of thought goes this way: Slightly higher airflow = MAF calling for more fuel to keep the mixture ratios close to constant = slight increase in power or torque or both = slight increase in fuel consumption. I'm certainly open to other interpretations though.

[Red2Liter]

Originally Posted by vtmike

I found it interesting there was already a hole in the support at the front of the car for the grommet. Almost like it was planned from the beginning or something.

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I suspect that the OEM intake system was a compromise between fuel economy and performance.Remember these engines run 0W20 lube; hardly what we'd choose to protect engine life intuitively. Many manufacturers are going to these light weight lubes in search of lower friction and slightly higher fuel economy. Thank God the lubricant suppliers are on type of their games!

[zooki]

Originally Posted by beaver_scott

Blitz came in at 6.69hp with fitment rating 3of5 and takeda came in at 6.36hp. With fitment rating of 4of5. Hks @ 1.52hp and weapon r @ -0.63hp were pretty bad. Trd was in the middle @ 2.52hp. K&n @ 4.34 but a lot of low end loss. Injen @ 5.61 and aem @ 5.83. There are drop in filters for the stock intake as well. Apexi @ 5.45, blitz @ 6.09 and k&n @ 5.68. Next month I think they are going to tune the ecu with the intakes to recheck performance gains/losses.

I find it amusing that they can post horsepower gains out to two decimal places...on a chassis dyno. Come on, that's just silly. Anything under 10 HP is within a variance range. Your not going to feel a difference between 2.52 HP and 6.36 HP in a 2800 lb. car. You're just not.

[TouchMyHonda]

Originally Posted by beaver_scott

Blitz came in at 6.69hp with fitment rating 3of5 and takeda came in at 6.36hp. With fitment rating of 4of5. Hks @ 1.52hp and weapon r @ -0.63hp were pretty bad. Trd was in the middle @ 2.52hp. K&n @ 4.34 but a lot of low end loss. Injen @ 5.61 and aem @ 5.83. There are drop in filters for the stock intake as well. Apexi @ 5.45, blitz @ 6.09 and k&n @ 5.68. Next month I think they are going to tune the ecu with the intakes to recheck performance gains/losses.

Nice

[Red2Liter]

Originally Posted by zooki

I find it amusing that they can post horsepower gains out to two decimal places...on a chassis dyno. Come on, that's just silly. Anything under 10 HP is within a variance range. Your not going to feel a difference between 2.52 HP and 6.36 HP in a 2800 lb. car. You're just not.

Yeah, one probably encounters more variation in output due to changes in weather/temperature, than the increases noted in the dyno pulls. However I'm still a believer in the improved drivability that I've noted in earlier posts on the TRD.

[cslntuee]

Originally Posted by Red2Liter

I've been sitting these discussions out for a few weeks while I just enjoyed driving my BRZ. I assumed that the OEM intake with the soundtube couldn't help but affect the total intake picture. The TRD intake looked good to me based on two things 1) the intake path was cleaner and more direct and 2) the CABox & filter were significantly bigger. It's true that one of the limits on airflow is the size of the OEM intake in the front of the nose, but I suspect the larger volume of the TRD box may be advantageous when you dump the throttle and the engine asks for a rapid input of air. Might not the larger volume box serve as a reservoir for air under those conditions? It's gratifying to see that some are measuring small HP gains with the TRD box and I've experienced a much more linear throttle response with mine. I believe that it's also passing more air too. This is suggested to me by a slightly lower fuel economy since I made the install. My train of thought goes this way: Slightly higher airflow = MAF calling for more fuel to keep the mixture ratios close to constant = slight increase in power or torque or both = slight increase in fuel consumption. I'm certainly open to other interpretations though.

I read the website here.
http://www.guerillaracing.com/subaru-brz-air-intake/
It wrote “Adding an air intake not only increases performance on your Subaru BRZ, but it also increases your fuel efficiency. “</SPAN>
However, you wrote” slightly lower fuel economy”
Which one is correct?
Thanks.

[Touge86]

Originally Posted by vtmike

Instructions do call for a reset.

One thing to consider, because all of the bends in the stock setup it is more restrictive, thus creating more friction and heat decreasing the airflow because of less dense air coming in. Something that hints at this is the stock airbox has air straighteners to reduce turbulence at the maf, while the trd has none.

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How do you reset the ECU? :O

[vtmike]

Originally Posted by Touge86

How do you reset the ECU? :O

Disconnect the battery for at least 5 minutes.

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[Red2Liter]

Originally Posted by cslntuee

I read the website here.
http://www.guerillaracing.com/subaru-brz-air-intake/
It wrote “Adding an air intake not only increases performance on your Subaru BRZ, but it also increases your fuel efficiency. “</SPAN>
However, you wrote” slightly lower fuel economy”
Which one is correct?
Thanks.

My experience with the TRD intake has been a slight decrease in fuel economy. The website you cite is an Advert. One must be sceptical always of claims for aftermarket products;" more power, better milage and it also cures shyness with women!"

[tripjammer]

Originally Posted by Red2Liter

My experience with the TRD intake has been a slight decrease in fuel economy. The website you cite is an Advert. One must be sceptical always of claims for aftermarket products;" more power, better milage and it also cures shyness with women!"

Yeah maybe a little bit, but I got 38 MPG with the intake installed just driving normal. But if you get on it...you will avg about 24 MPG...

[kev1360]

My mileage has gone up since the install. Only a couple of days though. Drivability much better.

[vtmike]

Originally Posted by kev1360

My mileage has gone up since the install. Only a couple of days though. Drivability much better.

I reset my car with the install, the dead pedal is finally gone and the car feels so much better. The low rpm torque increase is really evident.

My wife even noticed it without me pointing anything out.

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