What have we learned
First of all, this post might hurt the feelings of people who bought the injen CAI's but I feel like you need to be informed.
NO ONE should ever expect a 14hp+ gain just by installing an intake system. NO ONE!!! It's a tough horsepower battle out there between car manufacturers and believe me when I say that the stock intake systems are pretty much close to being maxed out. Infinity would not create a crappy intake system to loose hp while at the same time competing with carmakers like BMW. Why would they? Our engines only got bigger by 0.2 litres compared to the VQ35's but now it has two throttle boddies and air boxes instead of one. That's one throttle body and one intake system for only 3 cylinders. That's plenty.
Aftermarket intake manufacturers claim that their cold air intake will result in less restriction thus resulting in high hp gain. Have you seen how long the pipes are on CAI's? Yup, that in itself causes restriction all by itself. Race cars run open exhaust for the same reason. Also, that pipe will also get hot under the hood and air passing through it will also rise in temperature defeating the purpose of it being a CAI. The longer the pipe,also the more time the incoming air will have time to absorb heat!!! CAI pipes are also made of metal which is a great conductor of heat. CAI manufacturers will also claim you'll get a cool charge of air while you're driving. That only works on individual throttle body systems found on naturally aspirated race engines. Those throttle bodies are extremely close to the cylinder head intake ports so the air will not loose velocity. Long pipes with bends will kill that velocity. How can you get a high velocity air charge if the air filter is hiding behind the bumper anyway??? And last but not least, the little ripples on your stock intake arm causes air turbulence that creates a better A/F mixture. Old school road racers knows this trick. You simply won't get that turbulence effect on a smooth metal pipe!!! Ask any engine builders and they will tell you that they will port but not polish intake ports on cylinder heads on NA motors because they want that turbulence. I DARE INJEN OR ANY OTHER CAI MANUFACTURERS TO CORRECT ME ON THIS!!! I DON'T THINK ANY OF YOU CAN. YOU'RE DYNO RESULTS ARE PATHETIC CONSIDERING ITS PRICE. MORE ON THIS LATER. I NEED A CIGARETTE....
NO ONE should ever expect a 14hp+ gain just by installing an intake system. NO ONE!!! It's a tough horsepower battle out there between car manufacturers and believe me when I say that the stock intake systems are pretty much close to being maxed out. Infinity would not create a crappy intake system to loose hp while at the same time competing with carmakers like BMW. Why would they? Our engines only got bigger by 0.2 litres compared to the VQ35's but now it has two throttle boddies and air boxes instead of one. That's one throttle body and one intake system for only 3 cylinders. That's plenty.
Aftermarket intake manufacturers claim that their cold air intake will result in less restriction thus resulting in high hp gain. Have you seen how long the pipes are on CAI's? Yup, that in itself causes restriction all by itself. Race cars run open exhaust for the same reason. Also, that pipe will also get hot under the hood and air passing through it will also rise in temperature defeating the purpose of it being a CAI. The longer the pipe,also the more time the incoming air will have time to absorb heat!!! CAI pipes are also made of metal which is a great conductor of heat. CAI manufacturers will also claim you'll get a cool charge of air while you're driving. That only works on individual throttle body systems found on naturally aspirated race engines. Those throttle bodies are extremely close to the cylinder head intake ports so the air will not loose velocity. Long pipes with bends will kill that velocity. How can you get a high velocity air charge if the air filter is hiding behind the bumper anyway??? And last but not least, the little ripples on your stock intake arm causes air turbulence that creates a better A/F mixture. Old school road racers knows this trick. You simply won't get that turbulence effect on a smooth metal pipe!!! Ask any engine builders and they will tell you that they will port but not polish intake ports on cylinder heads on NA motors because they want that turbulence. I DARE INJEN OR ANY OTHER CAI MANUFACTURERS TO CORRECT ME ON THIS!!! I DON'T THINK ANY OF YOU CAN. YOU'RE DYNO RESULTS ARE PATHETIC CONSIDERING ITS PRICE. MORE ON THIS LATER. I NEED A CIGARETTE....
1) All things being equal, flow velocity is almost always better with a smooth surface. Do a search on extrude honing.
2) The ripples in the arms do not provide better A/F mixture because there is no fuel in the arms ahead of the throttle bodies.
3) Turbulence may be desired in the cylinder head itself, but every cylinder head I've seen is polished to reduce hot spots which cause detonation. They adjust the swirl pattern and create turbulence by head design. We use computational fluid dynamics (CFD) for that.
I'm not saying the Injen intake design is good or bad because I was not there when they did their R&D. There are too many variables into what makes an intake work. So why is everyone out to join the witch hunt without objective and comparable evidence of the results?
Finally, maybe the stock intake IS very good ... but there is ALWAYS room for improvement.
Let's just chill until objective and comparable dyno runs are made.
Everyone can rant or rave after that!
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Joined: May 2008
Posts: 27
Likes: 0
Hahah man Da Hashi, so much anger. lol.
So from what gxerboi was putting together, we would want black ripple for creating air turbulence, shorter piping distance for the air to travel and less chance of heat soak, better location to get higher air velocity, and cone-shaped filter..........hm sounds like a JWT? Hahah jk. Everybody buy one, quick!
So from what gxerboi was putting together, we would want black ripple for creating air turbulence, shorter piping distance for the air to travel and less chance of heat soak, better location to get higher air velocity, and cone-shaped filter..........hm sounds like a JWT? Hahah jk. Everybody buy one, quick!
Make the box out of some kind of ceramic?
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Registered User
Joined: May 2008
Posts: 27
Likes: 0
You're a cool guy...
Nice write up. No disrespect intended, but I'd like to make a few comments:
1) All things being equal, flow velocity is almost always better with a smooth surface. Do a search on extrude honing.
2) The ripples in the arms do not provide better A/F mixture because there is no fuel in the arms ahead of the throttle bodies.
3) Turbulence may be desired in the cylinder head itself, but every cylinder head I've seen is polished to reduce hot spots which cause detonation. They adjust the swirl pattern and create turbulence by head design. We use computational fluid dynamics (CFD) for that.
I'm not saying the Injen intake design is good or bad because I was not there when they did their R&D. There are too many variables into what makes an intake work. So why is everyone out to join the witch hunt without objective and comparable evidence of the results?
Finally, maybe the stock intake IS very good ... but there is ALWAYS room for improvement.
Let's just chill until objective and comparable dyno runs are made. Everyone can rant or rave after that!
1) All things being equal, flow velocity is almost always better with a smooth surface. Do a search on extrude honing.
2) The ripples in the arms do not provide better A/F mixture because there is no fuel in the arms ahead of the throttle bodies.
3) Turbulence may be desired in the cylinder head itself, but every cylinder head I've seen is polished to reduce hot spots which cause detonation. They adjust the swirl pattern and create turbulence by head design. We use computational fluid dynamics (CFD) for that.
I'm not saying the Injen intake design is good or bad because I was not there when they did their R&D. There are too many variables into what makes an intake work. So why is everyone out to join the witch hunt without objective and comparable evidence of the results?
Finally, maybe the stock intake IS very good ... but there is ALWAYS room for improvement.
Let's just chill until objective and comparable dyno runs are made.
Everyone can rant or rave after that!2. Ripples in the intake arm creates turbulence. This kind of flow does make a difference when it's time to mix with fuel inside the combustion chamber.
3. You're talking about the combustion area of the cylinder head being polished to reduce detonation and hotspot. I was talking about the intake ports.
Nice inputs. I respect that.
Registered User
Joined: Jul 2007
Posts: 6,301
Likes: 1
From: al, eguor notab
I just finished my Injen install and have been driving around for the past 30-45 mins and frankly I dont give a **** what anyone thinks about them... these intakes are the ****. Maybe its not double digit numbers but by god I definitely feel something extra and the sound well all I can say is WOW! Long story short it was worth every penny to me. That will be all.
O and Diamond Im on a lease and did it. I actually told my dealer about it & they were like thats fine just make sure you put the stock back on when you turn in the car, we wont say anything.
O and Diamond Im on a lease and did it. I actually told my dealer about it & they were like thats fine just make sure you put the stock back on when you turn in the car, we wont say anything.
Thread Starter
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Joined: Mar 2008
Posts: 36
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First of all, this post might hurt the feelings of people who bought the injen CAI's but I feel like you need to be informed.
NO ONE should ever expect a 14hp+ gain just by installing an intake system. NO ONE!!! It's a tough horsepower battle out there between car manufacturers and believe me when I say that the stock intake systems are pretty much close to being maxed out. Infinity would not create a crappy intake system to loose hp while at the same time competing with carmakers like BMW. Why would they? Our engines only got bigger by 0.2 litres compared to the VQ35's but now it has two throttle boddies and air boxes instead of one. That's one throttle body and one intake system for only 3 cylinders. That's plenty.
Aftermarket intake manufacturers claim that their cold air intake will result in less restriction thus resulting in high hp gain. Have you seen how long the pipes are on CAI's? Yup, that in itself causes restriction all by itself. Race cars run open exhaust for the same reason. Also, that pipe will also get hot under the hood and air passing through it will also rise in temperature defeating the purpose of it being a CAI. The longer the pipe,also the more time the incoming air will have time to absorb heat!!! CAI pipes are also made of metal which is a great conductor of heat. CAI manufacturers will also claim you'll get a cool charge of air while you're driving. That only works on individual throttle body systems found on naturally aspirated race engines. Those throttle bodies are extremely close to the cylinder head intake ports so the air will not loose velocity. Long pipes with bends will kill that velocity. How can you get a high velocity air charge if the air filter is hiding behind the bumper anyway??? And last but not least, the little ripples on your stock intake arm causes air turbulence that creates a better A/F mixture. Old school road racers knows this trick. You simply won't get that turbulence effect on a smooth metal pipe!!! Ask any engine builders and they will tell you that they will port but not polish intake ports on cylinder heads on NA motors because they want that turbulence. I DARE INJEN OR ANY OTHER CAI MANUFACTURERS TO CORRECT ME ON THIS!!! I DON'T THINK ANY OF YOU CAN. YOU'RE DYNO RESULTS ARE PATHETIC CONSIDERING ITS PRICE. MORE ON THIS LATER. I NEED A CIGARETTE....
NO ONE should ever expect a 14hp+ gain just by installing an intake system. NO ONE!!! It's a tough horsepower battle out there between car manufacturers and believe me when I say that the stock intake systems are pretty much close to being maxed out. Infinity would not create a crappy intake system to loose hp while at the same time competing with carmakers like BMW. Why would they? Our engines only got bigger by 0.2 litres compared to the VQ35's but now it has two throttle boddies and air boxes instead of one. That's one throttle body and one intake system for only 3 cylinders. That's plenty.
Aftermarket intake manufacturers claim that their cold air intake will result in less restriction thus resulting in high hp gain. Have you seen how long the pipes are on CAI's? Yup, that in itself causes restriction all by itself. Race cars run open exhaust for the same reason. Also, that pipe will also get hot under the hood and air passing through it will also rise in temperature defeating the purpose of it being a CAI. The longer the pipe,also the more time the incoming air will have time to absorb heat!!! CAI pipes are also made of metal which is a great conductor of heat. CAI manufacturers will also claim you'll get a cool charge of air while you're driving. That only works on individual throttle body systems found on naturally aspirated race engines. Those throttle bodies are extremely close to the cylinder head intake ports so the air will not loose velocity. Long pipes with bends will kill that velocity. How can you get a high velocity air charge if the air filter is hiding behind the bumper anyway??? And last but not least, the little ripples on your stock intake arm causes air turbulence that creates a better A/F mixture. Old school road racers knows this trick. You simply won't get that turbulence effect on a smooth metal pipe!!! Ask any engine builders and they will tell you that they will port but not polish intake ports on cylinder heads on NA motors because they want that turbulence. I DARE INJEN OR ANY OTHER CAI MANUFACTURERS TO CORRECT ME ON THIS!!! I DON'T THINK ANY OF YOU CAN. YOU'RE DYNO RESULTS ARE PATHETIC CONSIDERING ITS PRICE. MORE ON THIS LATER. I NEED A CIGARETTE....
Registered User
Joined: May 2008
Posts: 448
Likes: 1
From: Northern Virginia
Since this is supposed to be about what we have learned.....
I learned that it is better to wait and see before just blindly jumping in on such things.
I learned that the stock air box on the 2008 G37 is pretty damn good; it is just lacking that cool sound.
I learned that, for $550, HFCs are clearly a better mod for my car
I learned that, trying to "trick" the G37 ECU is not so easy to pull off.
I learned that a lot of my brothers and sisters get really fired up over such topics.
I learned that I made a good choice in dropping my order when I did.
I learned that we have an English major among us.
I learned that we have some good members who are willing to buy lots of non-OEM parts and pay lots of money to have dynos done....some post results and some don't; but they still spent the money.
Lastly, while not really learned but more perceived, I think I have come to believe that butt dynos may prove to be directly related to the psychological effects of hype and want. Kind of like the fact that a clean, shiny car feels faster than a dirty one…..same car, same everything, but your perception is that it is faster…..I think the same is true with this CAI!!!
I learned that it is better to wait and see before just blindly jumping in on such things.
I learned that the stock air box on the 2008 G37 is pretty damn good; it is just lacking that cool sound.
I learned that, for $550, HFCs are clearly a better mod for my car
I learned that, trying to "trick" the G37 ECU is not so easy to pull off.
I learned that a lot of my brothers and sisters get really fired up over such topics.
I learned that I made a good choice in dropping my order when I did.
I learned that we have an English major among us.
I learned that we have some good members who are willing to buy lots of non-OEM parts and pay lots of money to have dynos done....some post results and some don't; but they still spent the money.
Lastly, while not really learned but more perceived, I think I have come to believe that butt dynos may prove to be directly related to the psychological effects of hype and want. Kind of like the fact that a clean, shiny car feels faster than a dirty one…..same car, same everything, but your perception is that it is faster…..I think the same is true with this CAI!!!
Last edited by weave; Jul 10, 2008 at 09:41 AM.
Since this is supposed to be about what we have learned.....
I learned that it is better to wait and see before just blindly jumping in on such things.
I learned that the stock air box on the 2008 G37 is pretty damn good; it is just lacking that cool sound.
I learned that, for $550, HFCs are clearly a better mod for my car
I learned that, trying to "trick" the G37 ECU is not so easy to pull off.
I learned that a lot of my brothers and sisters get really fired up over such topics.
I learned that I made a good choice in dropping my order when I did.
I learned that we have an English major among us.
I learned that we have some good members who are willing to buy lots of non-OEM parts and pay lots of money to have dynos done....some post results and some don't; but they still spent the money.
Lastly, while not really learned but more perceived, I think I have come to believe that butt dynos my prove to be directly related to the psychological effects of hype and want. Kind of like the fact that a clean shiny car feels faster than a dirty one…..same car, same everything but your perception is that it is faster…..I think the same is true with this CAI!!!
I learned that it is better to wait and see before just blindly jumping in on such things.
I learned that the stock air box on the 2008 G37 is pretty damn good; it is just lacking that cool sound.
I learned that, for $550, HFCs are clearly a better mod for my car
I learned that, trying to "trick" the G37 ECU is not so easy to pull off.
I learned that a lot of my brothers and sisters get really fired up over such topics.
I learned that I made a good choice in dropping my order when I did.
I learned that we have an English major among us.
I learned that we have some good members who are willing to buy lots of non-OEM parts and pay lots of money to have dynos done....some post results and some don't; but they still spent the money.
Lastly, while not really learned but more perceived, I think I have come to believe that butt dynos my prove to be directly related to the psychological effects of hype and want. Kind of like the fact that a clean shiny car feels faster than a dirty one…..same car, same everything but your perception is that it is faster…..I think the same is true with this CAI!!!
A clean car IS faster than a dirty. You see the dirt and other particles on the paint of a dirty car creates excess drag that slows the car down, thus a dirty car is slower than a clean car.
... lol. j/k.
Registered User
Joined: May 2008
Posts: 448
Likes: 1
From: Northern Virginia
Oh man this is awesome stuff.
I am going to ask again. Did any of you own a G35 or 350Z in 03 when the Injen CAI came out for that?
SAME EXACT SCENARIO!!! THIS IS HOW IT GOES IN THIS BUSINESS.
I am going to ask again. Did any of you own a G35 or 350Z in 03 when the Injen CAI came out for that?
SAME EXACT SCENARIO!!! THIS IS HOW IT GOES IN THIS BUSINESS.
All the G35s went to JWT PopChargers, which may end up being what people use on the G37s.
Registered User
Joined: Apr 2008
Posts: 330
Likes: 1
From: Jersey Shore
Since this is supposed to be about what we have learned.....
I learned that it is better to wait and see before just blindly jumping in on such things.
I learned that the stock air box on the 2008 G37 is pretty damn good; it is just lacking that cool sound.
I learned that, for $550, HFCs are clearly a better mod for my car
I learned that, trying to "trick" the G37 ECU is not so easy to pull off.
I learned that a lot of my brothers and sisters get really fired up over such topics.
I learned that I made a good choice in dropping my order when I did.
I learned that we have an English major among us.
I learned that we have some good members who are willing to buy lots of non-OEM parts and pay lots of money to have dynos done....some post results and some don't; but they still spent the money.
Lastly, while not really learned but more perceived, I think I have come to believe that butt dynos may prove to be directly related to the psychological effects of hype and want. Kind of like the fact that a clean, shiny car feels faster than a dirty one…..same car, same everything, but your perception is that it is faster…..I think the same is true with this CAI!!!
I learned that it is better to wait and see before just blindly jumping in on such things.
I learned that the stock air box on the 2008 G37 is pretty damn good; it is just lacking that cool sound.
I learned that, for $550, HFCs are clearly a better mod for my car
I learned that, trying to "trick" the G37 ECU is not so easy to pull off.
I learned that a lot of my brothers and sisters get really fired up over such topics.
I learned that I made a good choice in dropping my order when I did.
I learned that we have an English major among us.
I learned that we have some good members who are willing to buy lots of non-OEM parts and pay lots of money to have dynos done....some post results and some don't; but they still spent the money.
Lastly, while not really learned but more perceived, I think I have come to believe that butt dynos may prove to be directly related to the psychological effects of hype and want. Kind of like the fact that a clean, shiny car feels faster than a dirty one…..same car, same everything, but your perception is that it is faster…..I think the same is true with this CAI!!!
