[G68]

Hello,



I have taken my intake mod to the next level.



What's new:



- The original rubber/aluminum piping has been replaced by a mandrel bent 3" stainless steel version. Ordered from Road Race Engineering.



- The AFM is now rigidly mounted after the air filter, not hanging off the Throttle Body.



I noticed that the power delivery was a bit rough with the AFM mounted in the original location. I know from previous dyno pulls that when I removed the air box, thus the rigid mounting of the AFM, the A/F ratio and power curves were very rough. Without the proper mounting, the AFM signal is effected by the engine vibrations. This results in a less than smooth power delivery.



Now, with the AFM isolated from the engine vibration, the power delivery is silky smooth. Combined with the new piping, this iteration is far better than the factory.



I didn't get to the dyno yet, but I did get to try the mod out on my friends '05 S2000. On the highway, before the mod, from 80 - 130 he would pull away from me. Now with this mod, I pull on him just a bit.



First pic is of the old design, the last three are the latest.



Thanks,

G-



   

           

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[Lemming]

Very nice install, can't wait to see the dynos. Please post you A/Fs as well.

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[968cab]

Looks very attractive and clean. Any concerns on driving in a hard rain vs the stock air box?

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[Josho]

Interesting theory, sounds logical. Verry clean install. How is the sound affected with the rigid tubing? Could be another cheap addition to move to the top of the list. Thank you for continuing to make these cars better.

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[flash]

looking clean - gives me an idea for something else too



the results you describe from moving the MAF tell me that the tube itself has restriction - that's what we found in the testing we did on the similar cone filter setup too, and why we ended up with our setup - i'd like to see some intake temp readings to see if maybe you get some chilling to make up for the resistance



i don't think he will have any problems whatsoever from water - the stock snorkel is actually in a much better position to present water issues than anything up in the engine compartment - water would have to go through way too many turns and over way too many obstacles to get up there

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[G68]

Flash,



I measured the intake temps (j type thermal couples in the intake stream) from beginning to end. There was only about a 1 to 2 degree F difference between filter and throttle body. No temp delta to make a difference.



Actually, this intake will have a rain / water problem. The factory intake in the front goes directly, in a straight line, into the filter. I have fabricated a panel to block a portion of the intake air on the passenger side of the long narrow intake grill to avoid any issues with rain.



Explain to me how you determined how the tube has restriction...... pressure differential?



G-

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[flash]

bummer - was hoping for a velocity induced chilling - oh well



given the height and the fact that it actually has to go through a grill, into a chamber and then through the opening to finally reach the filter, there is really no chance of water being an issue unless youare submerged, and at that point you have other things to worry about - don't sweat it



sort of - we measured restriction using a manometer - this was a very accurate instrument - we showed better than a 10% drop in flow due to the tube - the specifics are in the article



there is actually a formula for calculating restriction of a tube, given the size, length, bends, etc - i don't have it, but i know it exists if you want to figure out exactly how much

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[G68]

I am not sweating it. Maybe I am not explaining it properly. The intake air comes into the long narrow opening....right in front of the intake ...I can actually see the filter if I look into the front of the car....rain would directly hit the filter @ speed.



I am aware of the equation, I just don't think, given the length, the diameter, and the volume of air flow, the piping would create enough resistance in flow to reduce HP. I should dyno the intake compared to the air box version though.....

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[flwbyu]

I can actually see the filter if I look into the front of the car

Any pictures from the front showing this?

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[Greimann]

The instrument was actually a Dwyer Magnahelic gauge - a dial version of a manometer, which is typically a water or mercury column. The measurement was in differential pressure, the reference being atmospheric and the measured being a port just before the high tech suction device. The units were in inches of water and the flow was as constant as we could make it. It illustrated the difference in restriction among the various configurations. The most stunning piece of data showed that the stock snorkel and air box was equivalent to having the filter 75% blind.

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[flash]

i can see the intake with mine too - i have the greimann grille and no bumper at all in there - straight shot - drove in the rain - not a drop in there - even if a few drops did manage to hit the filter, they would be atomized and sucked into the intake - this is not a bad thing - a bit of water cleans things out nicely and actually increases poer (think water injection)



i would not spend a minute worrying about that part, and definitely would not put anything in the path of the airflow



as for the reduction in power, given that we saw a good 10% increase is resistance, and given the increase in power at maximum flow, you would only be talking about a little over 1 horsepower loss - nothing to worry about, still way more than stock, and you get the bragging rights of something you did yourself



enjoy it - good on ya

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[G68]

I will try to run the car in the rain without the additional block-plate to see. Your probably right.





Thanks for all the input and support.



Graham Rippel.

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