Gm IAT calibration help on s300
#1
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Gm IAT calibration help on s300
I have the gm sensor calibration sheet. On the s300 do I make all three setting on the iat temp the same? I notice there is a light, medium and heavy load temp setting
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Re: Gm IAT calibration help on s300
There is no way to calibrate non honda sensors on a Honda ecu base tuning software. There is not much of a reason to run a quicker responding intake temp sensor. What needs to be done is put the sensor in the charge pipe 5-8 inches from the throtttlebody. This will give you non-heat soaked readings and the sensor will actually respond to air charge temp changes. Also you can take it one step further and shave off the plastic from the oem sensor to expose the internals and it will respond much faster.
#3
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Re: Gm IAT calibration help on s300
Yes , I did this conversion for the heat soak reason and I place it on the charge pipe. Will the readings be off without not being able to change the air temp compensation correction percentage.
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Re: Gm IAT calibration help on s300
I've converted many OEM sensors to an open junction. response times goes from seconds to milliseconds. you have to be careful though, the stock thermocouple junction is very fragile... one wrong razor blade stroke and the sensor is destroyed.
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Re: Gm IAT calibration help on s300
Honestly you don't even need to touch the sensor. Just out a stock sensor in the charge pipe air temp compensation tables on s300 and Neptune don't do a whole lot of changing on the tune if the tune is good.
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Re: Gm IAT calibration help on s300
Yea on Honda based ecu tuning software there isn't much point. on a standalone however things are a bit different and they can definitely benefit from a sensor that rapidly responds to temp changes. especially if the weather is to one extreme or the other from when it was tuned.
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Re: Gm IAT calibration help on s300
Although I do feel like an idiot...
I thought my GM IAT sensor was closed junction so I cut the cage off to modify it to open junction only to find out it was in fact an OEM open junction sensor. Derp
I thought my GM IAT sensor was closed junction so I cut the cage off to modify it to open junction only to find out it was in fact an OEM open junction sensor. Derp
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#8
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Re: Gm IAT calibration help on s300
K, so I should be good for a dyno tune without any sitting changes?getting tune soon
Last edited by eg:R; 05-31-2014 at 08:00 PM.
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Re: Gm IAT calibration help on s300
You should be fine.
the bigger issue with the OEM sensor is heat soak, it will heat soak regardless of where it's located, heatsoak will be worse in the intake manifold though.
the problem is how the OEM sensor is made. the sensing thermocouple junction is under multiple layers of coatings.
there's a gray soft rubber layer immediately around the junction, followed by a harder, slightly thick black layer, then another soft layer of grey rubber (sometimes the colors differ between sensors but the number of and type of layers remains the same)
once these layers heatsoak it's hard to get the heat out of them. as a result the readings will be off regardless of placement and these layers basically insulate the sensor resulting in very delayed and inaccurate temperature readings.
what would help is using a thermally isolating gasket between the intake and head, between the throttle body and manifold, then use a similar material between the IAT sensor and it's mount. this well help isolate these parts from any heat transfer from the head.
if you have the OEM 2 bolt style IAT sensor that goes in the intake manifold then you'll have a hard time finding a way to mount it on the charge pipe. a company does make a billet aluminum mount you weld to the piping for the 2 bolt sensor, or you can make you're own and weld it on.
the easier method is to get the threaded style OEM IAT off of a crv with a b20. Just like the GM unit the body is threaded which means you can simply weld a threaded fitting to the charge pipe. it's a common pipe thread so you can find a fitting to weld on easily.
what material is your piping? you'll have to order an aluminum fitting online since most hardware/home improvement stores don't stock aluminum fittings. they do however stock steel/iron fittings that you could use if your piping is stainless steel or mild steel.
the bigger issue with the OEM sensor is heat soak, it will heat soak regardless of where it's located, heatsoak will be worse in the intake manifold though.
the problem is how the OEM sensor is made. the sensing thermocouple junction is under multiple layers of coatings.
there's a gray soft rubber layer immediately around the junction, followed by a harder, slightly thick black layer, then another soft layer of grey rubber (sometimes the colors differ between sensors but the number of and type of layers remains the same)
once these layers heatsoak it's hard to get the heat out of them. as a result the readings will be off regardless of placement and these layers basically insulate the sensor resulting in very delayed and inaccurate temperature readings.
what would help is using a thermally isolating gasket between the intake and head, between the throttle body and manifold, then use a similar material between the IAT sensor and it's mount. this well help isolate these parts from any heat transfer from the head.
if you have the OEM 2 bolt style IAT sensor that goes in the intake manifold then you'll have a hard time finding a way to mount it on the charge pipe. a company does make a billet aluminum mount you weld to the piping for the 2 bolt sensor, or you can make you're own and weld it on.
the easier method is to get the threaded style OEM IAT off of a crv with a b20. Just like the GM unit the body is threaded which means you can simply weld a threaded fitting to the charge pipe. it's a common pipe thread so you can find a fitting to weld on easily.
what material is your piping? you'll have to order an aluminum fitting online since most hardware/home improvement stores don't stock aluminum fittings. they do however stock steel/iron fittings that you could use if your piping is stainless steel or mild steel.
#10
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Re: Gm IAT calibration help on s300
I have aluminum piping. I have tap the gm iat onto the piping. A round 1/2' thick aluminum plates around the size of a quarter was weld on to the piping before it was
Tap due to the piping being to thin For rethread.
Tap due to the piping being to thin For rethread.
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Re: Gm IAT calibration help on s300
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Re: Gm IAT calibration help on s300
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Re: Gm IAT calibration help on s300
Yea the b20b powered crvs used a threaded GM "style" IAT sensor. I think they were on OBD1 and OBD2 models, can't remember exactly.
surprisingly not a lot of people know about the threaded body Honda IAT sensor. you'd figure more Honda ecu based builds would use that sensor due to greater flexibility in mounting solutions
surprisingly not a lot of people know about the threaded body Honda IAT sensor. you'd figure more Honda ecu based builds would use that sensor due to greater flexibility in mounting solutions
#18
Re: Gm IAT calibration help on s300
Factory Accord is thread in as well. Picture from when I was in the process of shaving the material off to expose the junction. OEM F series Accord IAT.
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Re: Gm IAT calibration help on s300
37880-P0A-A02
Rare indeed, only a couple MILLION produced for Accord, CR-V, Pilot, and Odyssey's. It uses a course M12x1.5 thread pitch, most Honda M12's are 1.25 pitch. Most people who "know Hondas" only know b-series or h-series.
Any more pics of that sensor mod, twkdCD595??
Rare indeed, only a couple MILLION produced for Accord, CR-V, Pilot, and Odyssey's. It uses a course M12x1.5 thread pitch, most Honda M12's are 1.25 pitch. Most people who "know Hondas" only know b-series or h-series.
Any more pics of that sensor mod, twkdCD595??
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