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Old 02-18-2008, 09:22 PM   #1
BrysImpreza
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Default CAI Piping into stock (93-99) airbox?

I've got this mocked up in my garage, but I have no had the chance to install it due to cold and busy conditions.

Has anyone done this yet with a K&N or Green panel filter in the airbox?

I'm looking for a balance of optimal performance, reduced heat, reduced noise and the option of running some ducting into the backside of the airbox from the front of the car.

Opinions?

Bry.
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Old 02-18-2008, 09:42 PM   #2
RaceFaceXC
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Done what? Is there supposed to be a picture or something? Where is the CAI piping going to from the stock airbox? fenderwell? foglight? I think you might need to add more info. There are tons of setups custom/ebay frankentakes that have been tried succesfully.
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Old 02-18-2008, 10:03 PM   #3
suby53
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I have also considered doing this. I have a '97 Outback so my airbox is the same as earlier years but I have a large "torque box" right on the throttle body. I guess this is for max low end torque by giving the motor the max amount of filtered air flow available when needed. I was thinking of keeping the torque box and stock tube into the air box and then putting in a K&N filter in the stock box. I was gonna cut out the hole in the fender bigger and run a 3 or 4 inch pipe down to behind the foglight area for cold air. I think it is a good idea!
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Old 02-18-2008, 10:09 PM   #4
formula91
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Quote:
Originally Posted by suby53 View Post
I have also considered doing this. I have a '97 Outback so my airbox is the same as earlier years but I have a large "torque box" right on the throttle body. I guess this is for max low end torque by giving the motor the max amount of filtered air flow available when needed. I was thinking of keeping the torque box and stock tube into the air box and then putting in a K&N filter in the stock box. I was gonna cut out the hole in the fender bigger and run a 3 or 4 inch pipe down to behind the foglight area for cold air. I think it is a good idea!
AHHHH there's TOO many things wrong with this!

-20 : Bad idea!

1. Snorkus provides little air restriction
2. Torque box doesn't do anything anymore: Low end loss is due to #4.
3. Main restriction comes from the torque box and the stock according tubing.
4. Removing the snorkus will cause MAF misreadings

Williaty's data logging proves it. The snorkus does not change the flow, and it caused him so much trouble when it was removed. Because anything past the snorkus doesn't change flow, process of elimination puts it at the stock tube past the air filter and unnecessary black box of doom. Will's setup involves: snorkus -> airbox -> frankentake -> TB and he gets 97% flow of a regular SRI/CAI setup at minimal cost.

Only problem is that it's not a CAI.

--edit--
I sound like his hoe, but he's the only one around here who does serious data logging...
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Old 02-18-2008, 10:54 PM   #5
suby53
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How would removing the snorkus effect the air readings at the MAF?! The air gets so turbulated by the filter that it won't even make a difference. And, the stock snorkus pulls air from inside the engine bay which is bad.

I have ran a number of different air intake setups and the stock torque box gives the best low end torque of any intake pipe style. Sure the top end is not as good as a 3" pipe but...

Also, using a panel filter that is sealed in the air box pull air from a high flow 3" pipe also sealed at air box will increase gas mileage and power by bringing in colder air.
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Old 02-19-2008, 12:33 AM   #6
formula91
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Quote:
Originally Posted by suby53 View Post
How would removing the snorkus effect the air readings at the MAF?! The air gets so turbulated by the filter that it won't even make a difference. And, the stock snorkus pulls air from inside the engine bay which is bad.

I have ran a number of different air intake setups and the stock torque box gives the best low end torque of any intake pipe style. Sure the top end is not as good as a 3" pipe but...

Also, using a panel filter that is sealed in the air box pull air from a high flow 3" pipe also sealed at air box will increase gas mileage and power by bringing in colder air.
A correctly done SRI will make power at all rev ranges. You shouldn't lose low end with a good intake setup. So in reality, it doesn't matter. A torque box has no bearing, it is the snorkus, and the lack of tuning that makes a low end low. (Allow me to explain )

The air gets turbulent after the air filter: this sort of.. not really true. Unless your panel filter is really warped. (Mine is )

However, due to the intake pulses from the engine, the air actually reverbs. That is it vibrates back and forth. This gets read by the MAF, and actually thinks that there is more air than in reality. Your engine then runs excessively rich for the 1k-2k range. After that the intake pulses are so fast that it becomes a continuous flow. If you take a look at the snorkus construction, the big jug at the bottom is designed to cancel out the reverbs by bouncing them against each other, allowing a smoother flow. You don't notice this much because the car is in CL. However, will's car was set to OL as soon as it hits the gas, and the effects are pronounced. Ask him, his A/F values were all over the place. After he did a 3" piping straight to the TB AND put back the snorkus, his problems were eliminated. Even if the filter did mess the airflow, the reverbs are a back and forth air flow problem not a swirling air flow problem.

If you wanted a cold air intake you could just cut off the tubing that leads back into the engine bay. That way you keep the snorkus, but stays in the fender well. Or you can just remove the snorkus, keep the stock air filter box and run a 3" pipe straight to the throttle body. Either way.

Essentially, it's the same thing you want to do, except with less restrictive stock tubing, and less chance of water intake. You still get cold air, and it costs about the same. What's not to lose from that setup in comparison to yours? That stock tubing is way too restrictive, and the snorkus is actually (surprisingly actually) beneficial for N/A cars. The turbo'd vehicles don't get this problem for obvious reasons.

The MAF/air reverb is the reason why so many ppl have low end loss. The first few thousand RPMs is when the MAF gets bogus readings. It has nothing to do with the torque box. If anything it's just something that came over from the old intake design days.
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Old 02-24-2008, 10:50 PM   #7
BrysImpreza
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Someone did this on a 99 RS, he said he had really good results, so I am going to try it this week.

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Old 02-25-2008, 12:54 AM   #8
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Originally Posted by BrysImpreza View Post
Someone did this on a 99 RS, he said he had really good results, so I am going to try it this week.

FOR THE WIN!

That would be a killer setup for any MAF-based NA subie.


Especially with the airhorns.




The airhorns are clutch.
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