AIH - delete or not?
Posting Guru
Joined: Oct 2004
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From: Morgantown WV
Originally Posted by guzzle92
My take on it after spending 23 years in HVAC, a restriction in the cold air return (intake) or heat duct (exhaust) is still a restriction and will effect air flow. With reguards to the AIH, I do not have any idea of how much that restriction would affect performance.
Post Fiend
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From: Carhenge
Originally Posted by guzzle92
My take on it after spending 23 years in HVAC, a restriction in the cold air return (intake) or heat duct (exhaust) is still a restriction and will effect air flow. With reguards to the AIH, I do not have any idea of how much that restriction would affect performance.
The AIH is not the most restrictive point in the induction system.
Postmaster
Joined: Oct 2004
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Originally Posted by Kwikkordead
Well that wouldn't be any fun. 
Thread Starter
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Fleet Mechanic
Joined: Feb 2005
Posts: 1,797
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From: Northern Colorado
Originally Posted by clux
What's the diameter of your turbo compressor outlet?
The AIH is not the most restrictive point in the induction system.
The AIH is not the most restrictive point in the induction system.
I don't know if the "most restictive point" has much to do with it as restriction seems to be accumulative. Try blowing through 3" of garden hose verses 50ft of hose. There doesn't seem to be any restrictive points in the 50ft hose, but the accumlative friction from that much wall suface really limits the amount of air that can pass through it.
Since I can't increase the outlet of the turbo or the size of the induction tube without a very large investment, I was looking for other ways to make small improvements of air flow.
Posting Guru
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From: Morgantown WV
Originally Posted by guzzle92
Stock turbo (.85)?
I don't know if the "most restictive point" has much to do with it as restriction seems to be accumulative. Try blowing through 3" of garden hose verses 50ft of hose. There doesn't seem to be any restrictive points in the 50ft hose, but the accumlative friction from that much wall suface really limits the amount of air that can pass through it.
Since I can't increase the outlet of the turbo or the size of the induction tube without a very large investment, I was looking for other ways to make small improvements of air flow.
I don't know if the "most restictive point" has much to do with it as restriction seems to be accumulative. Try blowing through 3" of garden hose verses 50ft of hose. There doesn't seem to be any restrictive points in the 50ft hose, but the accumlative friction from that much wall suface really limits the amount of air that can pass through it.
Since I can't increase the outlet of the turbo or the size of the induction tube without a very large investment, I was looking for other ways to make small improvements of air flow.
Post Fiend
Joined: Feb 2002
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From: Carhenge
Actually i think the stock turbo outlet is about 2" (that's a guess).
When I was studying the AIH delete trying to decide whether to actually do it, I read claims of inceases of mileage, lower EGT, and "feeling" more power. I got none of those results, just $10 poorer and some spare parts, and lots of smoke on cold mornings. I honestly plan on putting my heater back in.
Sometimes I think we get caught up in doing mods just because everone else is doing them. Of the free or low cost mods I have tried (zoodad, prepump, intank, harpoon and AIH) the harpoon is the only one that has lived up to what I read about it. I just don't want you to be dissapointed when you don't see any effect from doing the AIH delete.
When I was studying the AIH delete trying to decide whether to actually do it, I read claims of inceases of mileage, lower EGT, and "feeling" more power. I got none of those results, just $10 poorer and some spare parts, and lots of smoke on cold mornings. I honestly plan on putting my heater back in.
Sometimes I think we get caught up in doing mods just because everone else is doing them. Of the free or low cost mods I have tried (zoodad, prepump, intank, harpoon and AIH) the harpoon is the only one that has lived up to what I read about it. I just don't want you to be dissapointed when you don't see any effect from doing the AIH delete.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
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From: Rio Rico, AZ.
Originally Posted by clux
Actually i think the stock turbo outlet is about 2" (that's a guess).
When I was studying the AIH delete trying to decide whether to actually do it, I read claims of inceases of mileage, lower EGT, and "feeling" more power. I got none of those results, just $10 poorer and some spare parts, and lots of smoke on cold mornings. I honestly plan on putting my heater back in.
Sometimes I think we get caught up in doing mods just because everone else is doing them. Of the free or low cost mods I have tried (zoodad, prepump, intank, harpoon and AIH) the harpoon is the only one that has lived up to what I read about it. I just don't want you to be dissapointed when you don't see any effect from doing the AIH delete.
When I was studying the AIH delete trying to decide whether to actually do it, I read claims of inceases of mileage, lower EGT, and "feeling" more power. I got none of those results, just $10 poorer and some spare parts, and lots of smoke on cold mornings. I honestly plan on putting my heater back in.
Sometimes I think we get caught up in doing mods just because everone else is doing them. Of the free or low cost mods I have tried (zoodad, prepump, intank, harpoon and AIH) the harpoon is the only one that has lived up to what I read about it. I just don't want you to be dissapointed when you don't see any effect from doing the AIH delete.
The newer TDI's have three glow plugs in the coolant flange to help with getting the coolant warmer, but still not IAH.
Food for thought.
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Postmaster
Joined: Jan 2004
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From: colorado
Originally Posted by clux
Yeah, and they sell plugs for the port. it might be an issue if it was on the intake side of the turbo, but this thing is in charged side of the intake system. At positive pressure (boost) the heater isn't going to stop any air from getting into the cylinders.
I saw absolutely no effect from removing it, other than my pickup smokes a LOT more when it's cold out.
I saw absolutely no effect from removing it, other than my pickup smokes a LOT more when it's cold out.
Post Fiend
Joined: Feb 2002
Posts: 10,600
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From: Carhenge
Originally Posted by wlihntr
weather it is on the intake or pressure side does not make any difference, a restriction is a restriction. removing it WILL increase air flow in to the motor and it WILL increase smoke on cold starts...thats it
take a garden hose, turn it on free flowing, and start to kink the hose. How far do you have to kink it before you see a reduction in the output? not very far. Now, put a impulse sprinkler on it, turn the water on, and let it come up to pressure so the impulse sprinkler is running correctly. Now, slowly start to kink the hose to restrict flow. How far do you have to kink (restrict) the hose before you see a reduction in the sprinkler output? You will have to kink it until there is less water getting by the kink than is going out the nozzle of the sprinkler.
Being on the pressure side does make a difference, because the engine is both pushing (with the turbo) and pulling (with the cylinders) the air through. The turbo is already pushing more air than the engine can use, or you wouldn't see manifold pressure on your boost gauge. There is no change in boost when the AIH is removed.
Istill maintain that the AIH delete is a "feel good" mod, nothing more.
Post Fiend
Joined: Feb 2002
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From: Carhenge
Originally Posted by Kwikkordead
I wouldn't bother. The VW diesels that I work on have never had any sort of pre heater but glow plugs. Thier first offering to the US market was the '77 Rabbit and Dasher. A basic IDI with a air cleaner housing for a manifold and no heated intake whatsoever.
The newer TDI's have three glow plugs in the coolant flange to help with getting the coolant warmer, but still not IAH.
Food for thought.
The newer TDI's have three glow plugs in the coolant flange to help with getting the coolant warmer, but still not IAH.
Food for thought.
Not that the AIH has any thing to do with cold starting ability anyway, strictly emissions. But I also think we should be concerned about the emissions of our pickups and the perceptions that a smoking diesel creates. I would much rather have a clean burning diesel than a smoking one.
Postmaster
Joined: Nov 2004
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From: New Hampshire
Originally Posted by Fordafied
Istill maintain that the AIH delete is a "feel good" mod, nothing more.
I believe this also. There is no proof that it does anything for you.[/QUOTE]
i have done the mode, i used it to hook up the turbo boost gauge... VERY EASY..! that's why i did it that way... i was also concerned about getting a good reading on the boost gauge.. use a boost relief valve on the map line and you might as well not get your reading from that... and i was not interested in drilling into anything... taking out the AIH, which has had no noticable effect on my truck's cold weather operation, was the easiest way i could find to install the gauge... other than the occasional AIH code coming up when i go in to clear the codes... i don't think there is any increase in performance, but i loved the ease of install for the gauge..
Senior User
Joined: Jun 2003
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From: SC
I have 3 different things hooked to my MAP line. If done correctly, you can get a very accurate boost reading. I see PSI's up into the low to mid 30's when I am on it hard in the race setting using propane. I have the boost tap 1st in-line off the manifold, then I have my pressure sensor for the Pane and just before the MAP itself, I put the Over-boost eliminator in. Everything works like it is suppose to.
Posting Guru
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I wanted to do it the easy way. I also know that the AIH does NOT aid in cold starting, just in emissions when running cold.
Additionally, here is SoCal, it doesn't really get cold. I had no hesitation in deleting the AIH and using that spot for my boost gauge. If I need to restore it, no problem.
Did I notice "better throttle response, more power, better mileage"?
Nope. Sorry. Couldnt feel or measure any change.
Additionally, here is SoCal, it doesn't really get cold. I had no hesitation in deleting the AIH and using that spot for my boost gauge. If I need to restore it, no problem.
Did I notice "better throttle response, more power, better mileage"?
Nope. Sorry. Couldnt feel or measure any change.