A few simple CAI questions - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 10-30-2005, 10:50 PM   #21
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Quote:
Originally Posted by optmusprimer
So did what I wrote go over everyones heads or what? Forget it, put your IAT in the AC vents for all I care, I know where mine will be.
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Old 10-31-2005, 01:35 AM   #22
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Quote:
Originally Posted by optmusprimer
Quote:
Originally Posted by willwren
Ask yourself where the FACTORY put the sensor.
EXACTLY what I am saying. Which is why, in the intake I made the IAT is the roughly the same distance from the TB as the orginal one.
Well, that may be true, but there are two things to consider.

For one thing, on the stock intake, the IAT is located on the top and slightly to the rear, away from the exhaust crossover. On your custom intake, the IAT is on the bottom, much closer to that source of heat. That source of heat could give falsely hot IAT readings.

Secondly, most factory intakes that I have seen do not share that IAT sensor placement. My '89 has it on the airbox, a full foot away from the TB. The Series I engines had it on the airbox as well, also about a foot away from the TB. I believe that the Series II airboxes are generally too baffled to provide a good IAT mounting point, with the IAT in the moving air stream, and that that is the only reason that the factory chose to mount it in the flex tube. I can't say that for sure, but I have seen internal design of the Series II intakes, and I don't recall seeing a good place to mount an IAT and have it in the airstream. So I guess my second point is that I believe that the airbox, far from the heat of the manifold, is the factory'* IAT sensor mounting point of choice. I think that'* what Bill meant by his quoted comment.

Really it'* not the distance from the TB that matters. It'* the accuracy of the readings. And the most accurate temperature readings will probably not come from a sensor mounted facing the exhaust crossover pipe.

There'* really no need to get all up in arms over this. It'* just a difference of opinion.
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Old 10-31-2005, 01:46 AM   #23
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Quote:
Originally Posted by optmusprimer
Quote:
Originally Posted by willwren
Ask yourself where the FACTORY put the sensor.
EXACTLY what I am saying. Which is why, in the intake I made the IAT is the roughly the same distance from the TB as the orginal one.

Nice to see some brainstorming in this section for once.

http://www.bonnevilleclub.com/forum/...ic.php?t=41645
We're not measuring distances here, bud. We're talking RIGHT BEHIND THE FILTER. Which is VASTLY preferred than in the pipe itself. We're NOT talking about the same thing here at all. Why would you put a temp sensor in a pipe that runs hotter than the air within it?

Put your IAT in your AC vents for all I care. We'll keep putting ours right behind the filter where it belongs.
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Old 11-02-2005, 08:59 AM   #24
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1) the IAT was nowhere near the exhaust crossover pipe on my car

2) the critical part of the IAT is the actual probe tip on the end, not the body.
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Old 11-02-2005, 11:26 AM   #25
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1. A CAI or intake pipe DOES go right over the crossover pipe (heat rises, btw).

2. Heat transfer from the body of the sensor WILL affect it'* reading.



Now can you see why we put the IAT where we do?

1. To keep it from heating up from a hot intake pipe
2. Because the damn factory put it right behind the filter for a reason
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Old 11-02-2005, 09:54 PM   #26
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Quote:
Originally Posted by optmusprimer
1) the IAT was nowhere near the exhaust crossover pipe on my car

2) the critical part of the IAT is the actual probe tip on the end, not the body.
normally I try to stay away from this, but your attitude has been HORRIBLE, so I thought I'd chime in. Since what people are saying here is obviously just going over your head, here'* another thing to consider on your intake setup: you're sticking an obstruction in the path of your air a mere 3 inches before the MAF.

now, to re-iterate what has been said here several times. please pay attention. you can say we're not brainstorming, but if that'* the case, it'* only because we've had this conversation, oh, I dunno, a couple HUNDRED times ALREADY.

1. the length of the wire has JACK to do with the IAT readings.
2. the stock location is right behind the filter, away from heat sources.
3. as theJMFC pointed out, the air moving through the pipe will NOT be the same temp as the pipe itself - so putting the IAT at a hot point on the pipe gives you the possibility of a higher false reading.

The PCM will compensate if the IAT is reading cooler than what it expects (based on O2 data). It will likely even compensate for readings that are too hot. But by sticking the IAT right infront of your MAF, you're negating part of the reason for putting a CAI on the car to begin with! If you're okay with introducing restrictions into the system that DON'T need to be there, why get rid of the accordian tube at all?

LOOSE the attitude. People here give advice based on EXPERIENCE. There have been PLENTY of discussions based on the intake design, which is what the advice is based off of. That and plenty of practice and theory.

I'm stopping now before I get closer to flame territory. But I seriously get pissed when people come in here and throw attitudes around like teenage girls.

<edit> and the fact that you're trying to give advice based on your intake... when you were so sure that you didn't get any benefit from it, and have moved back to a drop in and stock box... well...
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Old 11-02-2005, 11:54 PM   #27
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All this talk makes me wish I could install mine right now.

So when you drilled your Rx-4750'* hole bigger, how did you keep the plastic shavings out of the filter so they didn't get sucked into your engine?
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Old 11-03-2005, 10:29 AM   #28
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Quote:
Originally Posted by Logan
All this talk makes me wish I could install mine right now.

So when you drilled your Rx-4750'* hole bigger, how did you keep the plastic shavings out of the filter so they didn't get sucked into your engine?
when I did mine, it was a two man job. I had a couple of fingers inside of the filter holding a pop bottle cap (from a 2 liter of coke ), while theJMFC dremeled away. all of the shavings fell into that, and we were able to remove it (be careful to not let it drop into the filter while you're taking it out!) that way. worked out well, but it deff. took two people for me to do it right. I didn't figure we'd be able to do it any other way w/o leaving something inside of the filter...
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Old 11-03-2005, 10:54 AM   #29
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I chose a different path on my IAT hole. I used a soldering iron. No debris. It stunk for awhile (did it outside), but worked well.

I currently have my water/methanol injection entering the IAT hole with a custom bracket pointing the nozzle right into the metal intake pipe inside the filter, and the IAT in a hole in the pipe RIGHT behind it. I may switch these two soon, as I think the methanol is giving me false IAT readings (need to scan and verify) causing me to run too rich.
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Old 11-03-2005, 11:23 AM   #30
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I used a rotozip, then my air compressor to gently blow the debris out.

Randy used a step drill for Mortehl'* then air.
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