I finally modified the intake system going from an Injen (POS) to a hybrid short-ram with the stock intake. Everything went smoothly, but I need help in figuring out the ideal position to install the air temp sensor.

Ideally I want to install it in the MAF assembly (#2) but not sure how that would affect the MAF sensor (turbulence?).

Alternatively I can install it in the air box assembly immediately after the MAF (#1), but I am concerned with the temperature coming back from the valve cover breather.

I suppose I could cap off the valve cover breather on the air box as another option and install the air temp sensor at #1 position.

Thoughts?

 

Put it as close to intake air this way your car can most accurately adapt to the changing air temp

 

Agreed, but the only place to mount it is the MAF tube. My concern is potential turbulence that would affect the MAF readings. Am I overly concerned with that?

 

Just duct tape it inbetween the air filter and maf.

 

Ghetto...but ironically I have duct tape around my air filter where it connects to the tube because of a tear in the filter. You can see it in the pic.

But that gives me an idea I'll have to look at. I think it can possibly be installed directly in the air filter.

 

Bam...problem solved. Air intake temp sensor fits nicely in the air filter. I just hope the emissions tech doesn't call this aftermarket and void my upcoming emissions test.

Do you like the ghetto duct tape on my air filter? HAHA...

 

I noticed an immediate difference last night with temperature once I had the air temp sensor mounted. Range from 25 degrees C to 45 degrees C (77 degrees F to 113 degrees F) so far. The outside temperature has cooled quite a bit in the last few days so that certainly helps as well.

My engine temp has gone down as well. I was running up to 110 degrees C (230 degrees F) when my one fan was broken and I had the Injen intake on. Now, after the fan fix, adding some purple ice to the coolant, and going with the hybrid intake it is down to 88 to 90 degrees C (192 degrees F).

The car seems to like this setup better as the throttle response and downshifting is quicker. I noticed with the Injen, and just got used to it, a half second to almost full second delay when I mashed on the accelerator. It doesn't have that delay any longer.

 

s m h

 

Valuable input...thanks.

 

this is off topic but how come everyone says the injen intakes suck? i thought they were all the same in the end its just a pipe right? and why just injen i never heard anyone say k&n or aem sucks plus i also heard injen was good but once i joined this forum i see so many people not likin it

 

It is an OK intake, but the real problem is that is sits right behind the radiator so all the hot air blowing into your intake doesn't help. It is like a half-a** cold air intake, but worse from air temperature standpoint, than a stock intake or short ram type intake.

If you think about it, this type of hybrid intake I converted too is very cheap to do. All you need is a cone style filter and an adapter plate for the MAF. The stock intake has the rest of the parts you need. The only issue is where to mount the air temperature sensor, which I opted to put it in my filter for now. I'm buying a used spare MAF tube and sensor to play around with mounting the air temp sensor in the MAF tube to see if affects the MAF sensor at all. I prefer this as it is a more stock and cleaner look.

The air filter in my pic is basically trash...I have a spare one I'll put in once I figure out the final mounting of the air temp sensor.

 

I like what you did with the IAT sensor. Did you just drill a hole in the plastic and stick it in there basically?

No I dont like the duct tape(at least you didn't use grey or decorative though), over time its going to get all gooey from the heat. I know they seel some type of adapter that will fit right there. my .02

 

I drilled a hole. It was very easy and simple. Personally, I would prefer to have it in my MAF assembly because it seems to be a cleaner look to me.

You are correct about the duct tape... You can see it starting to get gooey already. It is quite a mess. I'll be putting the spare filter in soon once I do a final determination of the air temp sensor location.

 

Injen runs about the same or just slightly lower temps than stock.
People only hate on the Injen because they called it a CAI, which isn't really accurate. But temps are still cooler than stock and way cooler than a standard SRI.

SRI is by far the hottest of the 3 setups.



This is good info, I have to say, it takes some ***** to post a picture like that!

As far as the location, that is a decent one. IMO, you'd be best getting a pipe to replace the Helmholtz resonator that you still have in there, and using that pipe for the IAT placement. As someone replied quickly in this thread, you're best measuring IAT as close as possible to the TB, directly in the intake air stream (installing in the Helmholtz resonator like you pictured originally is a no-go.)

 

The temperature data I have shows the Injen runs quite a bit hotter than the setup I have.

On a stock intake I would assume it runs a bit cooler than my setup with the hood scoop portion.

As far as the air temp sensor it seems closer to the air intake point is best. On stock setup the air temp sensor is on the hood scoop piece before the air filter and nowhere near the throttle body.

 

Yeah but your temperature data had a broken fan for the injen, and a working fan for the SRI. Thats not exactly apples to apples.

 

I have temp data after fan repair with Injen. SRI setup cooler than that. I'll post the data later today.

 

ooo makes sense i want a functional heat shield for my sri but idk if they make any for the max

 

Temperature data...

-Data from Injen Intake was taken two nights ago after replacing the fan shroud.
-Data from Hybrid Intake was taken last night after mounting the air temperature sensor in the intake.



Now I know some non-believers will point to the difference in ambient temperature, but honestly I can't see the 5 degrees difference impacting the intake temperature results THAT much.

 

The Injen that came installed on my car (2005) puts the filter behind the driver's foglight, fairly far away from the radiator and fan. I'm considering taking a dremel to the bumper cover to let more air in by the foglight.

 

Sounds like an upgrade from my 2k Injen intake as it was right behind the radiator fan. It was less than an inch from the fan.

 

What is your 'hybrid setup'? Maybe I missed this.

 

Ideal setup and Stock setup don't exactly go hand in hand, not that you're wrong, certainly not, just saying assuming that the stock setup is best is not, well, best.

The 02/03 is in with the MAF. The 00/01 is cheesily mounted in the lower inlet duct. IMO, that is NOT the ideal location, as it won't accurately measure the air temp.
Air temp in the main inlet will be different than air temp at the throttle body, perhaps only marginally depending on the setup, but on a stock 00/01 setup, the difference will be at least a few degrees I'm sure.

Measuring between the MAF and TB is best IMO. This gives you the most accurate reading of the incoming air temp.

This reason is amplified when you consider you could just as easily have the IAT out of the intake stream, beside the filter. It would technically be measuring 'incoming air temp', but because the flow characteristics, velocity, density, and so forth are vastly different IN the pipe, the temps will also differ greatly. It is for this reason the 00/01 Stock setup is not at all ideal for accuracy, and likely a big player in why Nissan changed it in 02/03. I'ts also of note that the method of measuring IAT at the MAFS is one that is commonly used amongst OEM's and has been for some time now, it's just a much better and more accurate way to measrue it.

As for your chart, that's well put together, nice! Yes there's variables not noted, and measuring at different ambient temps will throw the readings 'accuracy/legitimacy' out the window, but a nice bit of useful info regardless, certainly enough to gauge what's hotter/colder.

 

The hybrid references the mix of stock and aftermarket intake parts. I suppose it is basically a short ram intake.

As far as variance in temperature by the current location in the air filter this could be an issue since the data shows a small variance in the hybrid (11) versus the Injen (36).

When I get the other MAF assembly I'll do some more experimenting. I'd rather locate the air temp sensor in the MAF tube versus the throttle body as it is easier. I should have the MAF by end of next week so I can do some experimenting that weekend.

 

If you can post an overall pic of your setup it'll help. My vote ifs still removing Helmholtz and putting a pipe there. And install iat in that location. You don't want it before the mafs and can't have it too soon after or it could alter mafs signal.