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air induction

13 March 2001
Montreal, Canada
I was thinking of putting an extension from the throttle body to my side rear fender and then just putting an air filter directly behind my side vents. I wonder if this is going to help dramaticly or just produce problems. If so, would the fuel/air mixtures be a problem. I never drive the car in the rain.
Just to clarify, NSXTASY is not ScienceofSpeed. Richard was just pointing you to my website (thanks Richard).

-- Chris


www.ScienceofSpeed.com - Click for more info
www.NSXClassifieds.com - The internet's only exclusive NSX Classified site!
I like what you're trying to accomplish and wonder what the outcome will be (aside from a louder & throatier sound). It will definitely effect your carburetion - howmuch .. I can't tell you. I have alot of experience with 2 stroke race engines and since they are much more sensitive with air/fuel mixture, a larger air intake warrants re-jetting the carb.
Here's another suggestion that might help. Talk to your local Performance Imporvement shops that have tried this on Vetts and Camaros etc. Find out if they have to play around with the fuel/air mixtures. At least it will give you a starting point.
does the increased performace over an RM or similra warrant all the extra work or money? I'd still love to see dyno proven advantages of one over another for reference.
It seems that larger engines seem to benefit more from intakes. A cold air intake on my C5 added 25RWHP. The NSX was very efficient from the start so it's tough to add HP.
I am curious how much HP a cold air intake like you're suggesting would provide.
Has an NSX with the Cantrel ever been dynoed before and after?
I think that the hardest thing to notice with any of these inatke modifications is a dyno difference (either positive or negative), since most are intended to provide additional airflow while at speed, which no dyno (that I know of) can show. Does anyone with a Gtech or some similar device want to try a series of runs one afternoon?
There must be some way to view the speed density reading that the intake gets - the more the air, the higher the reading. You could view this at various speeds.

I believe that intake tract length has more of an effect on performance than almost any other variable. The Cantrell intake effectively lengthens the factory intake length. In most cases, I've seen that this increases mid range horsepower without affecting other areas of the power band.

There isn't very much room to fit a filter in that area on an NSX and it may be more trouble than it's worth. However, if you're serious about doing it, I would get the flat, conical K&N filter. Also, you would have to find something with ovalish mandrel bent pipes unless you want to cut factory metal and open up the hole between the factory intake and the vent area.

If I had the time, I would love to try this myself. The intake noise would be mean. Come to think of it, I'll make some calls and try to build one in the next couple of weeks and dyno it (who needs a life outside of cars and work?).

I remember reading somewhere (perhaps it was one of the black NSX books from Honda) about all the engineering work that went into the tuned intake plenum and air box.

I think there's very little performance to be gained from the air intake changes. For a stock, or close to stock, motor it seems pretty much optimized.

The only benefit seems to be that modified air intakes sound cool.


1992 NSX Red/Blk 5 spd #0330
1991 NSX Blk/Blk Auto #3070 (Sold)
1974 Vette 454 4 spd Wht/Blk
Looking for 76-79 Honda Accords
a longer intake pipe will decrease your performance. The shorter, the better. Honda owners gain more power when running cold air intakes because of filter location. it is out in the fender where the cold air is but while the normal intakes is in the hot engine bay getting air from the hot radiator fan. A short ram intake in the engine bay with a nice cold air box will beat a extended cold air intake any day. There have been dyno tests where both, a short ram intake, and a extended cold air intake being used sticking out of the engine from the hood and the shorter one won hroughout the rev band eccpet for a spike the cai had at 4400 rpm. As for an nsx, it all depends. if the air comming in the engine from the side scoops dont get heat soaked by the time it reaches your air filter, a extended intake will decrease performance. if it does, the extended intake piping might work if it does get the colder air. As for the SoS the air induction sounds wonderful but the price... kind of pricey for a piece of plastic. if they molded it out of carbon fiber, it would of justified its price. I am downing your product Chris, but the price shocked me. I originally saw it in a link off of prime and thought it was a great product but after looking at its price, it shocked me seeing how expensive it was.
It will definitely effect your carburetion

Our cars are being confused with Fieros again :-(

NotTooFast: While a comparable product on say a Civic may be inexpensive, you have to remember that product was R&D for a market based on economies of scale. WIth the NSX, NSX vendors/manufactures do not have that benefit.

$1000 R&D over 1000 cars is different than
$1000 R&D over 100 cars

It's not just a 'piece of plastic'. It has aluminum and fiber as well :)

-- Chris


www.ScienceofSpeed.com - Click for more info
www.NSXClassifieds.com - The internet's only exclusive NSX Classified site!
"...$1000 R&D over 1000 cars is different than $1000 R&D over 100 cars..."

Actually the differential is probably even greater than 10 to 1. In fact, I'm somewhat surprised and delighted that there's an aftermarket market for the NSX at all.

When you consider that the potential import market for a Honda Civic component could be in the tens of thousands compared to a few hundred for the NSX market it makes you wonder why companies even bother.

Kudos to all the NSX aftermarket developers!


1992 NSX Red/Blk 5 spd #0330
1991 NSX Blk/Blk Auto #3070 (Sold)
1974 Vette 454 4 spd Wht/Blk
Looking for 76-79 Honda Accords
while the normal intakes is in the hot engine bay getting air from the hot radiator fan

Measurements of temperatures in the engine bay of the NSX have shown that, when the car is moving, it's not much hotter than the ambient temperature.
First of all, thanks for all the replies. Second, I was thinking of using the HKS mushroom filter that I had on my Probe GT. That filter is amaazing and is much smaller and round compared with the KandN.(for the fender)
I was also thinking that if I could angle all the tubing for optimal flow instead of just a straight pipe, the effort would be wourth it. The reason why I am interested in this mod is that I am convinced, but not dyno proven, that performance will be increased. Not to sound crazy, but my friend has a GSXR1300 and we would race on the highway (no point racing on a street start, by the time I drop the clutch he is gone) he would pull away easaly, after just installing my exaust/headers I could keep up with him. When I got my cheap dropin filter by KandN, I would actually pass him.
Now you know why I really want to try this idea, but I am worried about air/fuel mixture. I do not feel like looking on EBay for an NSX engine(unless it's supercharged)
Keep up with / pass a Hayabusa? With just bolt-ons? What gear was he in? The Busa hits red-line at about 80mph in 1st gear. I assume you started around 60? Even if he only dropped to 2nd gear, you'd have no hope. 3rd at 60 would be tough to beat. Was he in 4th, or even 6th?

01' NSX-T Silverstone
01' Audi A6 2.7t
00' Suzuki Hayabusa GSX1300
02' Honda VTX-1800
While a longer intake track (all else equal) is always less effective, if you use a set up that is ram-air, the benefits of increased volume will much more than offset the normal losses through the longer pipe.

I am confused at the suggestions that it will change your A/F ratio. How? The motor knows there is more air (in all cars with either mass air or speed-density systems) and the ECU will adjust. Since air is the limiting reagent in this situation, more air is more hp.

Don't no nuttin 'bout no NSX;
Don't no nuttin 'bout birthin' no babbies.

I know you are probably freaking out about my comment, but it's true. I didn't mention at what speeds, but I did mention only highway. I was talking from 180kph up until 260kph. I kid you not my friend but it's true. From a stand still he could probably take me going backwards on his bike and me going downhill with the wind on my back.
Not freaking out at all. I know Busa's can be beat, but I don't believe by an NSX. Even super/turbocharged, let alone N/A. At 260kph the busa is half way through 4th gear, and pulling strong. The NSX is done, and hasn’t pulled hard for 20kph or so. Now, I don't blame the rider if he didn't have the throttle WOT, or wasn't winding it out in every gear(those speeds are scary on a bike), but I have a real tough time believing an n/a NSX is even close.

I'm not saying it didn't happen, just saying I believe something was wrong with the rider or bike.
Like David said, short for Hayabusa, or Suzuki GSX1300R. Some stats:
1298cc, 170 hp, 540 lbs wet.
Top speed: 194 mph
1/4 mile: 9.94 @ 144 mph

That's stock. There are nut cases that install big bore kits, cams, NO2, and even Turbo's.

I've heard of some hopped-up Vipers and even some Supras that can pull a stock Busa from 70mph up, but they are few and far between.