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Old 05-18-2002, 03:37 PM   #1
energy57
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Default AEM cold air intake... or ...Injen cold air intake?

Just curious which one people think is better?
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Old 05-18-2002, 04:39 PM   #2
RobPA
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Silencer Hack Mod, and cheaper :P
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Old 05-18-2002, 04:49 PM   #3
energy57
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Did it, and love it. But need more air!
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Old 05-18-2002, 05:44 PM   #4
datdudedennis
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aem better fitment, less maf distortion

dennis
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Old 05-18-2002, 06:01 PM   #5
Scoobs
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im the man for this question

this is my second wrx the first was an auto with the injen..and the one i have now is a 5spd with aem... and the aem fits much better.... for some odd reason was 100% easiar on the install part...the injen was a lil louder if you like that... performance wise there really is not a dif i see a better top end dif with the aem though...I would recomend the aem over the injen.
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Old 05-19-2002, 01:50 AM   #6
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the aem has larger diameter piping and therefore runs the car a little leaner to make more power. the aem is a good mod but if you want a unichip Turbo xs doesnt have a map for the aem intake. something to consider.
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Old 05-19-2002, 02:35 AM   #7
datdudedennis
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please when you post and try to help others out, post the right info. the aem where the maf is is smaller diamter than the 3 inch injen. the aem is 2.75 which is closer to the stock than the injen is. i sold my aem but i miss it already b/c i wanted to get a chip. some even run cai with chips and have it still run fine but who knows how the fuel mixture and everything is thrown off.

dennis
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Old 05-19-2002, 02:40 AM   #8
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I heard some good things about the Blitz SUS-power intake.
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Old 05-19-2002, 02:50 AM   #9
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trust me the aem and injen give power, i had a custom under the hood setup with a flat style filter and heat soak was a biotch.

dennis
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Old 05-19-2002, 02:59 AM   #10
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I don't know about any of that, from all the dynos i've seen from various people, neither cold air intakes for the WRX make ANY power. Power didn't change what so ever. ECU immediately tunes them out.

Jay
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Old 05-19-2002, 03:23 AM   #11
oldmansan
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Default AEM or Injen

Local speed shop owner had the Injen on his WRX, didn't fully appreciate it (also had to modify to get it to fit) and wound up going with the AEM. Felt it was the better CAI. I have a friend who has the Injen and after he looked at my AEM (before install) he commented that the machining and craftmanship looked better on the AEM and that the install instructions were light years ahead of the Injen. I bought the AEM myself and install was very easy and straightforward.

San
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Old 05-19-2002, 04:40 AM   #12
energy57
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Thanks Alot for all the suggestions! As of right now I'm leaning toward AEM, but as someone said since I might be getting a turboxs chip will it work?
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Old 05-19-2002, 05:00 AM   #13
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Quote:
Originally posted by energy57
Thanks Alot for all the suggestions! As of right now I'm leaning toward AEM, but as someone said since I might be getting a turboxs chip will it work?
We've had lots of problems with cars that have the AEM installed.

We don't recomend it, and really don't even like to tune a car with that intake.

The injen seems to be quite a bit nicer to tune... It's also only 2mm larger at the MAS housing, so the car runs a little less lean from the start with this CAI.

As a side note, we make more power by just cutting the Injen off before the pipe goes into the fender. You can get a consistant 2-3hp gain from hacking the injen. Makes you wonder what good a CAI is right?

-Nathan
www.turboxs.com
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Old 05-19-2002, 08:39 AM   #14
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So Nathan, your saying that short pod type units are better? Units like the MRT pod , Blitz, and HKS filters?
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Old 05-19-2002, 11:15 AM   #15
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Quote:
Originally posted by datdudedennis
please when you post and try to help others out, post the right info. the aem where the maf is is smaller diamter than the 3 inch injen. the aem is 2.75 which is closer to the stock than the injen is. i sold my aem but i miss it already b/c i wanted to get a chip. some even run cai with chips and have it still run fine but who knows how the fuel mixture and everything is thrown off.

dennis
This is what i was told by Mark at turbo xs. My friend has the injen and it looks to be smaller in diameter. maybe im wrong but it sure looks smaller.
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Old 05-19-2002, 11:34 AM   #16
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Mark at TurboXS told me that they were going to be coming out with an intake of their own in the near future. That would really work out nicely for all us Turboxs Unichiped costumers.
So far I'm still running a K&N filter with the stock airbox. I ran 13.3 with the stage 2 that way.
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Old 05-19-2002, 12:55 PM   #17
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Quote:
Originally posted by mitch808
So Nathan, your saying that short pod type units are better? Units like the MRT pod , Blitz, and HKS filters?
The short pod types seem to work the best. The Blitz however has a very oversized MAS housing. It's way too big and will cause serious lean run conditions. The newest version is smaller than the one they recalled, but it is still at least 7mm or so oversized. This is just way too big. I also am not a big fan of the blitz's "filter." Your not stopping much with that.

-Nathan
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Old 05-19-2002, 01:20 PM   #18
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Does anyone know the inside diameter of the stock, Injen and AEM intakes?
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Old 05-19-2002, 01:33 PM   #19
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Quote:
Originally posted by nmyeti


We've had lots of problems with cars that have the AEM installed.

We don't recomend it, and really don't even like to tune a car with that intake.

The injen seems to be quite a bit nicer to tune... It's also only 2mm larger at the MAS housing, so the car runs a little less lean from the start with this CAI.

As a side note, we make more power by just cutting the Injen off before the pipe goes into the fender. You can get a consistant 2-3hp gain from hacking the injen. Makes you wonder what good a CAI is right?

-Nathan
www.turboxs.com
Hey Nathan is that 2 or 3hp over the CAI intake or over the stock setup or over the Resonator removal as in stage 1? Also when you say 2 or 3hp increase is that on an otherwise stock system or one of the stage setups (obviously makes a difference).

Also just for reference do you know roughly home much difference there is between the resonator/hack compared to the Injen/hack (shortened) on something like the stage 2 kit. Also, if you convert a standard stage 2 setup over to the injen/hack intake setup is there a new map for this?

Oh, and I might as well also ask about the TurboXS intake in the works. Is this going to be "knock-off" of the shortened Injen intake or will it be a little different in design?

Thanks,
Carlo
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Old 05-19-2002, 01:34 PM   #20
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Quote:
Originally posted by nmyeti


The short pod types seem to work the best. The Blitz however has a very oversized MAS housing. It's way too big and will cause serious lean run conditions. The newest version is smaller than the one they recalled, but it is still at least 7mm or so oversized. This is just way too big. I also am not a big fan of the blitz's "filter." Your not stopping much with that.

-Nathan
Nathan, do you think the pod type intakes (I usually call these HAI - Hot Air Intakes) is any better then the stock airbox? I know the ECU on the WRX is picky so I want something that gives gains but not give idle problems and throw CELs. On my previous car, i had a PR CAI and that dropped my idle about ~200rpms but there was some gain but lost low end.
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Old 05-19-2002, 02:58 PM   #21
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I'll try to answer all these questions in one post.

1. It's 2 or 3 hp over the CAI design. Which is about = to the hacked silencer setup. Most of the CAIs on the market make power by leaning out the car with a false mas reading (i.e. the they tell the ecu there is less air going into the motor than there really is) and once you correct that signal so that you get the proper A/R reading your actually at about the same power as the stock box with a hacked silencer. When you use a short pod setup, there seems to be another 2 to 3 hp to be gained over a CAI or hacked silencer setup on stage 2 up to stage 4. I assume the gains are similar on a stage 1 or stock car, but we've not tested the hacked injen on stage 1.


2. The difference then between a stock box with a hacked silencer and a hacked injen is really only about 2-3 hp. Makes most CAIs not really worth it does it? We've had cars with stock air boxes make 290hp on the dyno. The stock system is just not that restrictive. At least the biggest restriction is not the air box.

3. There is no new map for the hacked injen vs. the standard injen map.

4. The TXS intake will be a short pod style setup with proper a proper mas housing size similar to an Injen that has been hacked, but with a bit better sensor placement in the mas housing.

5. For the most part the short ram pod types make a few more hp than the stock air box. The difference is really not huge, and until you replace the inlet hose I don't see you making huge gains with a free flowing intake.

-Nathan
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Old 05-19-2002, 04:58 PM   #22
Carlo
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Thanks Nathan for your answers. They were pretty much what I thought you were going to say however.

Not to put you on the spot but what I don't understand is why TurboXS (and Vishnu for that matter) don't use a LARGE CAI and tune appropriately for it. What I'm getting at is more like the way Cobb tunes the Unichip.

Physics tell us with out a doubt that colder air going into the turbo will equal colder air coming out of the turbo. The intercooler is of no concern because it will try and lower temperatures even lower. The colder the air going into the intercooler the colder the air coming out of the intercooler and the more oxygen going into the engine. It may not be huge but every little bit helps (just like "porting" does).

The trick to this is of course picking a presently made CAI, or designing one yourself. The AEM or Cobb/APS intakes seem to have the best design and I would say probably the APS has a lot of R&D behind it. Once the correct ratio is figured out for the intake it should be pretty easy to compensate correctly in the Unichip for it and be able to add fuel accordingly.

I agree that the end result will be the same "safe" Air to Fuel ratio that we already have. The BENEFIT is that more air and fuel can get into the engine QUICKER and it will be COLDER. This in a sense is the same with lightened pulleys. You can rev up quicker and the engine follows the throttle position slightly quicker.

Oh, just came back and added this part. The reason the hacked Injen intake is making slightly more horse power (even though it's hotter air) IS BECAUSE there is a flow restriction. By cutting the intake you are allowing air to pass through the tube quicker. Now if you have a bigger tube with proper flow, sucking colder air that is COMPENSATED for correctly in the Unichip I bet you see even better horse power from the system.

I think most of the present Unichip tuners have dropped the ball a little on pushing the envelope with the intake because the "dyno" showed no difference. Of course the dyno won't show a difference unless the system is tuned properly for the part. As an example look at dynos for the FP turbo when it was just installed using the stage 2 map. Then go back and look at it now with some proper tuning.

Doesn't this make sense?

Carlo
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Old 05-19-2002, 05:28 PM   #23
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Carlo,
The bottom line is that unless you replace the hose after the intake, you have not gotten rid of the main flow restriction.

The APS intake is quite nice, but once its tuned there is no real difference in power.

The heat difference between air in the fendor and air under the hood is very slight... even more so when the car is moving, and the best thing is to provide as easy of an intake path as possible for the turbo to suck air into itself.

The overall post intercooler temps seem to be almost no different with a CAI vs a short ram or the stock box. I feel there is no reason to push the development of a much larger intake if we are still stuck with the main restriction in the inlet path which is the stock inlet hose. Replace that, and you might see some good gains, but you still have the next restriction which is the inlet size on the turbo.

The best bet is to convert to a MAP based system, and run a straight (but short pipe) off of a much larger tubine inlet, that has been moved to allow for a full 3 inch pipe to fit. As for that, you bet i am working on it... but it has very little application to both unichip customers or those that want "bolt-on" turbo chargers.

-Nathan
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Old 05-19-2002, 08:07 PM   #24
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FWIW, I had installed the MRT POD filter on my car awhile back. I liked it a lot. The sounds were great, as without an aftermarket BOV, I had no other way to get those "rally" sounds. I bought the MRT unit because upon reading the "Training WRX" book (worth having, but get the new 2nd edition), one of the authors felt the pods sucked more air than a CAI, and thus if the inside/outside temps were not over a certain % difference, then the pod wins hands down.

Now as for performance, I noticed that the boost went a bit higher (on oem gauge), came on faster, and throttle was more responsive. BUT. This is good while you are moving! If you AutoX like I do, waiting in line for your run can kill you! At one of our last events, a practice with a lot of laps, the outside temps at California Speedway were in the 120's! Under the hood could cook a steak in almost 2 minutes. I lost a lot of power then. So this time, the inside/outside % was great. But on a cold, misty morning, that car was amazing (of course, colder and denser air).

I have now gone back to the stock airbox, and though I no longer get the "rally" sounds, I am still not loosing power. Just a wee bit response loss, but not that much. So, for my next step, I am thinking of doing the resonator mod. Could someone please explain it to me? I have heard some mention to just cut the bottom off, and seal the top tubes off to make the front scoop blow right to the airbox. Another cut the box off at an angle so as to still get some fenderwell air in. What I was thinking, upon looking at the resonator, has anyone just cut the front of the bottom "tank" off so as to make it into a scoop? Seeing as it is facing the airvents on the side of the front bumper, it could concievably help to partially ram air in. What do you think?
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Old 05-19-2002, 08:17 PM   #25
dolbnyc1
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I agree with the shorty theory too, the intercooler will
cool the intake charge. anyway, the pipes on the injen and
AEM get really hot anyway. so short one like the MRT,
Blitz, and HKS. work well.
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