Experimenting with Intake Air Temp. Request for comments.

juld0zer · 02-19-2013, 09:56 PM

yeh it does, mine's just more patchy like a pile of band aids hahah!

Do you guys have Radio Shack still around or similar electronics/DIY shops? Surely someone's put together a kit before and mass produced it. There might be some schematics available on the net to build your own but i'm not too good with soldering. It took me over an hour to solder that thermister onto the tip!

The sensors are Maxim DS18B20. I've dealt with Maxim IC in the past and they've sent me some samples so if you're interested in making your own you could give that a go. Not sure if they still give samples. Otherwise it shouldnt be too hard to buy the chips locally or on ebay. Let me know how you go because i've always wanted to know what the temperature of the air is (using an independent measuring device).

The thermister i used had almost identical resistance at 20*C but i'm not sure of the rest of the scaling.
I have a feeling my external IAT sensor reads 1-2*C warmer than the ambient temp indicated on the dash cluster - that's something i can live with. However i've seen the IAT temp match the onboard ambient temp so i could be wrong.

I did the Modshack fangvent mod on the weekend (had to do it slightly differently as the AUDM model has airbag sensors mounted on the fang vent plates) and i think it's a step backwards in terms of how quickly IAT drops after moving from a stand still. Maybe it's the black plastic ducting i used which is soaking heat and holding heat within the 65cm snorkel.

Maybe the ram air effect is only achievable if one mounts the snorkels exactly as Modshack and others did - directly in place of the fang vent plates. I couldnt do this so i just have two pipes with bell mouths zip tied very close to the fangs. My theory is that the diameter of the bell mouths is much smaller than the diameter of the entire radiator grille area, therefore takes longer to displace the (hot) air available to the airboxes. The air pressure via the radiator grille would also be higher than the air pressure thru the bell mouths, exacerbating the slow displacement of warmed air (assuming the same vehicle speed).

I'm also noticing my fuel level dropping quicker but i'll give it a couple of tanks & report back. Could be just me being extra aware of things. I need another very hot summer day to test the fang vent mod as well.

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02-19-2013, 09:56 PM	#36 (permalink)
juld0zer Enthusiast Member Join Date: Nov 2012 Location: Sydney Posts: 428 Drives: 11 Nissan 370Z MB M6 Rep Power: 140	yeh it does, mine's just more patchy like a pile of band aids hahah! Do you guys have Radio Shack still around or similar electronics/DIY shops? Surely someone's put together a kit before and mass produced it. There might be some schematics available on the net to build your own but i'm not too good with soldering. It took me over an hour to solder that thermister onto the tip! The sensors are Maxim DS18B20. I've dealt with Maxim IC in the past and they've sent me some samples so if you're interested in making your own you could give that a go. Not sure if they still give samples. Otherwise it shouldnt be too hard to buy the chips locally or on ebay. Let me know how you go because i've always wanted to know what the temperature of the air is (using an independent measuring device). The thermister i used had almost identical resistance at 20C but i'm not sure of the rest of the scaling. I have a feeling my external IAT sensor reads 1-2C warmer than the ambient temp indicated on the dash cluster - that's something i can live with. However i've seen the IAT temp match the onboard ambient temp so i could be wrong. I did the Modshack fangvent mod on the weekend (had to do it slightly differently as the AUDM model has airbag sensors mounted on the fang vent plates) and i think it's a step backwards in terms of how quickly IAT drops after moving from a stand still. Maybe it's the black plastic ducting i used which is soaking heat and holding heat within the 65cm snorkel. Maybe the ram air effect is only achievable if one mounts the snorkels exactly as Modshack and others did - directly in place of the fang vent plates. I couldnt do this so i just have two pipes with bell mouths zip tied very close to the fangs. My theory is that the diameter of the bell mouths is much smaller than the diameter of the entire radiator grille area, therefore takes longer to displace the (hot) air available to the airboxes. The air pressure via the radiator grille would also be higher than the air pressure thru the bell mouths, exacerbating the slow displacement of warmed air (assuming the same vehicle speed). I'm also noticing my fuel level dropping quicker but i'll give it a couple of tanks & report back. Could be just me being extra aware of things. I need another very hot summer day to test the fang vent mod as well.