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I finally got around to testing a 3" silicone duct I fabbed up from the passenger brake duct into the RR-Racing Intake Box.
here's the data (datalogged with OBD Fusion (highly recommended) with the Le Link OBD2 device).
By first glance, the data including the duct lean towards colder temperatures. In fact they do. A quick 2-sample t-test shows that the mean of the ducted data set is < the mean of the data w/no duct.
Overall, the difference in averages is 5 F. Not ducted ran 5 F hotter. And ducted ran 2 F cooler.
The two trials were performed back to back with the same conditions at NJMP track day sessions (e.g.ambient temp stayed steady at 46 F).
To clarify: for the no duct trial, I plugged up both ends of the duct with shop towels and taped the openings which resulted in no flow.
This is a cheap, quick, and effective DIY mod that's shown results at high speeds (and I reckon would work well during highway driving too).
Thanks for the data points and expirementing with this modification. Wouldn’t redirecting the air that’s supposed to be cooling the brakes result in higher brake temps and increased wear? Personally, I would want to keep my brakes cooler while on track rather than a few degrees colder air into the engine. It would be interesting to see the temperature difference between the front left and right brakes with this system in place.
Thanks for the data points and expirementing with this modification. Wouldn’t redirecting the air that’s supposed to be cooling the brakes result in higher brake temps and increased wear? Personally, I would want to keep my brakes cooler while on track rather than a few degrees colder air into the engine. It would be interesting to see the temperature difference between the front left and right brakes with this system in place.
This doesn’t redirect air completely to the intake...the brake duct is still functional. Even then, RR-Racing has done lots of track testing with one of the ducts removed (to make space for supercharger piping): no apparent effect on brakes, even remarkably in high-stress track day situations.
this was addressed on a previous thread and/or my build thread as well!
Great job JDMV8! I wonder if if could work on the stock intake box? I don't have the rr-racing intake and i don't I have headers. Been sticking with gutted cats as it worked pretty well so far although I am leaning towards headers as I suspect my passenger side stock header may be cracked.
I have no doubt it works as an effective ram air duct for more air and cooler air at higher speeds!
We did this exact same mod in the Volvo S60R community to get more cold air into the stock box so we tapped the duct next to the foglight and ran a tube exactly as shown here.
Wonder if Rafi and the crew will start to sell this if they deem it as effective enough?
Great job JDMV8! I wonder if if could work on the stock intake box? I don't have the rr-racing intake and i don't I have headers. Been sticking with gutted cats as it worked pretty well so far although I am leaning towards headers as I suspect my passenger side stock header may be cracked.
I'm sure it can. However, you'd have to cut a hole in your stock airbox and mount the other end of the duct in it. That would make for an enclosed system...I'm sure
Also, a 3" silicone pipe pinches when routing it behind the headlight (the cross-sectional area is reduced by 20%, I would guess). That constriction should necessarily increase air velocity (fluids speed up at constrictions). I guess coupled with the ram air effect at higher speeds, this did its job!
This was just a fun DIY project, headers are a whole different ballgame
Originally Posted by MileHIFcar
I have no doubt it works as an effective ram air duct for more air and cooler air at higher speeds!
We did this exact same mod in the Volvo S60R community to get more cold air into the stock box so we tapped the duct next to the foglight and ran a tube exactly as shown here.
Wonder if Rafi and the crew will start to sell this if they deem it as effective enough?
Yes, we talked about it before! Now at least I have data. I suppose a fog light delete kit would work well to market in this case, to make it more plug-and-play.
Thanks for sharing your data. Useful for those with the tuned intake.
Do you still have your stock airbox & filter element? Wonder what that delta would be vs. oem.
Smaller MAF housing but it'll be more of an enclosed unit with a duct being bypassed into it...comparable temperatures changes to my experiment for sure.
Originally Posted by FinLIFE
Do you have a picture of that piece that's mounted down low where you attach the hose to? Wanna see what it looks like. Might do the same
03-17-18, 09:48 PM
Air Intake Duct with Results...it works
