Intake Temps?

[tt3kgt]

Your very welcome.

Next time I make a smart ass comment, Ill try to make it relevant.

porter:
The temperature sensor measures air temp, but heat transfers from the IM to the sensor giving it a false reading. When you are idling there isn't much air coming in the motor to cool the sensor so it reads hotter than actual IAT.

so why did honda put it where they did? it is different, but is it actually not more accurate? I see how the manny could heat it up since most of it body is bordered by the manny. i think this would help but i am curoius about any drawbacks maybe with deacceleration. i think that it would maybe overrichen the mixture, since the sensor will read cooler temps where it would be, especially when idling on a hot day when the tb is closed. tell me what ya think.

[d112crzy]

Injectors shut off during decel...

Anyways, Honda put it there because they wanted to. The stock ecu can compensate for it well enough. If you take the time to tune it out, your tuning softare(even crome) can compensate, but not as well. It'll get you close enough.

What's your timing look like? I'm thinking maybe you have high EGT's and the heat is just transferring all over causing high IAT's. I've seen smaller turbo's put out less heat than that.

[tt3kgt]

Injectors shut off during decel...

Anyways, Honda put it there because they wanted to. The stock ecu can compensate for it well enough. If you take the time to tune it out, your tuning softare(even crome) can compensate, but not as well. It'll get you close enough.

What's your timing look like? I'm thinking maybe you have high EGT's and the heat is just transferring all over causing high IAT's. I've seen smaller turbo's put out less heat than that.

i'll get val to get a copy of the map up here as soon as we can, what are you looking for?

[dbsharp]

Yea your not going to get the IAT 100 correct with one sensor. The only way I can think of to get it dead on would be to measure the temp before the tb and the temp of the IM metal, then figure out the rate of heat transfer to the air from the IM. The equation to figure that out would be complicated and there would be a lot of variables to account for. Its just not practical.

When your at the drag strip and your getting a false high temp reading, due to the time spent waiting to run, your engine management is probably retarding the timing which is going to cost you precious power.

[HondaBob]

what intake temps are everybody running? ours is 140f degrees today while the outside temp is around 97-103F. it seems a little high for what i like, so any help would be greatly appreciated!

I know you guys have moved on from the original topic, but I thought i'd share a similar situation.
This is at 8-12psi, evo3 big 16g.


This is the only good log I could find, this is on a 65 deg day, on my first run at the track of the night. The run started with 120 deg iat. My intercooler is too small. On a 75 deg day, I have seen them climb to 210*f..

I would love to see 140 degrees on my setup, but my ic setup is just too nifty to ditch, lol. We'll see what the meth does.

[noobcake]

im assuming thats on the accord, and is that because of your top mount cooler?

edit:is that dip on the first graph because you double clutched?

[bcjammerx]

I know you guys have moved on from the original topic, but I thought i'd share a similar situation.
This is at 8-12psi, evo3 big 16g.

This is the only good log I could find, this is on a 65 deg day, on my first run at the track of the night. The run started with 120 deg iat. My intercooler is too small. On a 75 deg day, I have seen them climb to 210*f..

I would love to see 140 degrees on my setup, but my ic setup is just too nifty to ditch, lol. We'll see what the meth does.

No intercooler setup is "too nifty" if it gives you 210*f ...

[WiKKeDV16]

joser you might be onto something.. low timing might be causing the egts to be higher than they should...


wheres the timing map val?

[MRX]

We'd need the base timing as well, mike.

Granted I don't think it's the timing, the air velocity is much too high under boost and when heat is being dissipated from the oncoming air to be greatly effected by the heat transfer from the intake mani.

I had intake temps around 85-90 degrees under boost as a reference.

[gdout90accord]

We'd need the base timing as well, mike.

Granted I don't think it's the timing, the air velocity is much too high under boost and when heat is being dissipated from the oncoming air to be greatly effected by the heat transfer from the intake mani.

I had intake temps around 85-90 degrees under boost as a reference.

damn bro where u been.


like carlos said, u might be having high EGTs.

[midnightrayne]

sorry ill load the map tonight - this is a bit over my head and i told mike he needed to put his .2 cents in. so i havent been keeping track. sorry - but thanks for all the input so far!

[MRX]

damn bro where u been.

School

Thought about it some more...if there are high egt's then the turbo itself would be getting hotter than normal, then before and just after the air is compressed it's in a small heat soaked enclosure where the transfer can take place quickly as opposed to the intake mani. Egt's are a viable solution if that's true.

[HondaBob]

Second thought, Post up a pic of your entire chargepipe routing. You may be close to a downpipe, manifold, or other heat source.

Third thought... Its freakin 100 degrees outside, and you have a dark color car... even sitting still not running in the sun, your iat's will probabally show a good bit higher than ambiant. Without a liquid/air or other auxiliary cooling than air itself, your iat's are always going to be higher than outside. 40 degrees is not too much out of the question for just being normal on a hot day.

As for the intake manifold spacer, I personally belive they help... for a little bit. You will still heatsoak to the intake eventually... The bolts will still transfer a good bit of heat too. Its not like that stock paper gasket transfers heat very well anyway.

im assuming thats on the accord, and is that because of your top mount cooler?

edit:is that dip on the first graph because you double clutched?

haha, funny guy.. I think that could be a loss of trakshun, and I feathered it out a hair. and yeah, thats the top mount IC.

[WiKKeDV16]

bob..here.. two things i think might need addressing.. heres the IC routing. and a shot from below without the DP on.. i couldnt find any shots from below or above..with downpipe and IC pipes together.. but i wonder how close the DP gets to the IC piping








wonder how close the unwrapped IC pipe is to the full rad...

[MRX]

There's a huge difference in the physical temp of the intake mani before and after the phenolic gasket. Before the phenolic, just as reference, I wasn't able to touch the intake mani without burning myself afterwards the phenolic I was able to keep my hand on any part of the intake mani as long as I wanted, it was barely warm. In fact, there should be a phenolic throttle body and upper intake mani gasket if they don't already exist.