TRD Intake ! CAI ?!

[FR-Sizzle]

Originally Posted by JimmyMac

There are a few FI systems that work with stock intake box, but none with the TRD intake due to the placement of the opening facing the throttle body.

If you go FI like AVO the last thing I would really worry about modifying is the OEM air box. I doubt it would make a large difference if you did use something like the Perrin CAI or any other aftermarket intake that would work with it.

Just use a drop in filter and if space allows get a duct if you really want but IMO money could be spent at other places if you go FI to get better performance gains. I would much rather put that 3-400 bucks you use on an intake for a nice exhaust. If you go FI why not get something like a nice titanium exhaust which would benefit much more than a dumb intake where its mainly for the sound than anything else.

3-400 bucks more on a cat back/exhaust will get you a much higher quality exhaust and you would probably just need a little more to get an even nicer exhaust depending what you want. If your budget was say 900-1000 for an exhaust you could use that 300-400 you saved from an intake and get something like Greddy/Trust GTS exhaust. That is probably the only Non TI exhaust I would pay 1500 for since it looks and sounds amazing. I personally love the design. Or you can get a Tomei or Amuse full titanium exhaust.

Intakes are a waste of money. A drop in would be good enough especially if you have go FI with a kit like Innovate or AVO that keeps the stock air box. I am sure they would come out with a better intake too in the future if you really want something other than the OEM box. But why mess with something thats already working/designed well. If you arent FI and want some better induction sound then get an intake. I personally would spend it on an exhaust as that sound is much more satisfying in the end.

[Kostamojen]

Originally Posted by FR-Sizzle

Intakes are a waste of money.

Exhausts are a waste of money. They are afterall just a series of metal tubes. Save some money and have your local exhaust shop fabricate one for you.

Or like Dsport proved, just get a muffler delete and save almost all your money.


This TRD intake is the first quality OEM intake I've ever seen for a Subaru engine. It really should come from the factory with these screw the noise generator.

[FR-S Matt]

Originally Posted by Kostamojen

Exhausts are a waste of money. They are afterall just a series of metal tubes. Save some money and have your local exhaust shop fabricate one for you.

Or like Dsport proved, just get a muffler delete and save almost all your money.


This TRD intake is the first quality OEM intake I've ever seen for a Subaru engine. It really should come from the factory with these screw the noise generator.

Exhausts aren't a waste if you do it right. Combine it with a header and a tune and you'll blow away the stock exhaust all day. The right parts have to come together for it to work well. Exhaust alone is only going to change your sound.

[tennisfreak]

I've seen proven gains from just the header and a tune. Technically from the catback there is no significant gain which is why Nameless only recommends an axleback (for the sound).

The real gains after the header would be removing the cat in the front pipe which is where the most restriction is.

That being said. I have a CAI and a catback. Some can tell me they are useless but it does not make me any less happy with my choices.

[frs10]

where are you guys getting the best prices for ur TRD intakes?

[Hanakuso]

Originally Posted by frs10

where are you guys getting the best prices for ur TRD intakes?

Ebay seems to be the best. Especially if you snag a 10% off coupon

[frs10]

Originally Posted by Hanakuso

Ebay seems to be the best. Especially if you snag a 10% off coupon

they have coupons on ebay?

[Hanakuso]

Originally Posted by frs10

they have coupons on ebay?

I've gotten 2 10% off coupons within 1 year. I think they come random

[frs10]

Originally Posted by Hanakuso

I've gotten 2 10% off coupons within 1 year. I think they come random

im assuming they come from ebay itself?

[Hanakuso]

Originally Posted by frs10

im assuming they come from ebay itself?

iirc I got one a year ago from ebay and 2 months ago I got one from paypal.

[vtmike]

What tuners are you guys using with the TRD intake? I've read it wasn't the best intake to tune with (forgot which tuner mentioned it). So far this has been my experience with a remote tune, experiencing tip in knock and rattle noise from 3.5k to 4k rpms after multiple data logs and edits. These issues are persisting so I'm going back to stock tune with transient timing fix which I've had no issues with.

Sent from my Nexus 7 using Tapatalk 4

[wootwoot]

Originally Posted by vtmike

What tuners are you guys using with the TRD intake? I've read it wasn't the best intake to tune with (forgot which tuner mentioned it). So far this has been my experience with a remote tune, experiencing tip in knock and rattle noise from 3.5k to 4k rpms after multiple data logs and edits. These issues are persisting so I'm going back to stock tune with transient timing fix which I've had no issues with.

Sent from my Nexus 7 using Tapatalk 4

If it didn't happen with your stock tune then it is the fault of your new tune and not the intake... Does that sound right to you?

I think Drift Office said the intake made some turbulence which was difficult to deal with but they seemed to get it down well. I would contact them. Let us know what he says.

[vtmike]

Originally Posted by wootwoot

If it didn't happen with your stock tune then it is the fault of your new tune and not the intake... Does that sound right to you?

I think Drift Office said the intake made some turbulence which was difficult to deal with but they seemed to get it down well. I would contact them. Let us know what he says.

Yeah, saying it's the tune. I know some guys on here have mentioned having a tune with the intake. Just trying to get people's experience with various tunes.

Sent from my Nexus 7 using Tapatalk 4

[nelsmar]

Originally Posted by vtmike

What tuners are you guys using with the TRD intake? I've read it wasn't the best intake to tune with (forgot which tuner mentioned it). So far this has been my experience with a remote tune, experiencing tip in knock and rattle noise from 3.5k to 4k rpms after multiple data logs and edits. These issues are persisting so I'm going back to stock tune with transient timing fix which I've had no issues with.

Sent from my Nexus 7 using Tapatalk 4

Originally Posted by wootwoot

If it didn't happen with your stock tune then it is the fault of your new tune and not the intake... Does that sound right to you?

I think Drift Office said the intake made some turbulence which was difficult to deal with but they seemed to get it down well. I would contact them. Let us know what he says.

I have been tuning a local's car as of late. He has a TRD intake and i can verify there is turbulence at 2.6-3.2 maf voltage. We had to pull the low end to compensate for this to avoid knock. The reason for this is there are a number of spots where there is a wide swing in turbulence. For example we are commonly seeing at a specific part of this range the voltage swing from ~2.9v to ~3.2 on average multiple times. In the maf scaling this shows a swing of ~40% g/s air flow. Which means a literal 40% enrichment / lean back and forth. Due to this issue we have seen a "dip" and "hump" pattern that we get in our AFR. The reason for this is if we tune the two major regions of the maf and the turbulence is hitting both of these we swing one part of the tune lean, and one rich. You will see high spikes at the lower RPM, and low spikes in the higher RPM. So if you bring either up or down the other joins in. If there was a convenient way for the ecu to "average" this, then we could resolve it with ease. However the ecu doesn't work that way.

Here is a sample of the dips and hump vs our requested AFR:


And in comparison here is a more detailed view of MAF voltage vs requested AFR. You can see spots where the maf voltage swings quite a bit (giving upwards of 40% error margin) and then later on in the higher RPM range it smooths its self out.


The solution we are using as of current (which isn't fantastic) is to pull timing and just 'average' the two against our current target AFR. This works but obviously doesn't let us push the car to its potential due to air readings.

However last night we were not getting knock feedback in our tests as we simply pulled ignition to compensate for the swings. This just gives a little less power in the lower region.

We are planning on attempting to mess with the actual intake today to see if we can alter the turbulence effect today. We are going to try an alternative post-maf pipe, and remove, and if needed put in a modified snorkel to see if it changes how air flows during this region.

I would be more than happy to take a look at your logs if you would like. I'll pm you my contact info if you would like to chat.