Air Pump Replacement Pulley Kit
Thread Starter
Instructor
Joined: Sep 2001
Posts: 128
Likes: 0
From: Pittsburgh PA
Air Pump Replacement Pulley Kit
Hello everyone. I'm a new user. In March I bought a 91 Corvette, and I'm looking to slowly upgrade it so I'll be asking alot of questions. I just installed an air foil and I was wondering if the Air Pump Replacement Pulley is a good upgrade to do. Also what other upgrades would anyone recommend for a good ol' L-98.
Safety Car
Joined: Jun 2000
Posts: 4,870
Likes: 25
From: Long Island, NY
Re: Air Pump Replacement Pulley Kit (Lexdog)
Yes, it is a good upgrade. It will clean up the engine compartment a little.
Also there is a slight performance gain, about 1 tenth in the 1/4 mile.
Vic
Also there is a slight performance gain, about 1 tenth in the 1/4 mile.
Vic
Thread Starter
Instructor
Joined: Sep 2001
Posts: 128
Likes: 0
From: Pittsburgh PA
Re: Air Pump Replacement Pulley Kit (Vic'89)
What actually does the AIR Pump do anyway, and will it effect my car's idle if I replace it? Also can I use the down sized and oversized pulleys with the Air pump replacement pulley?
Racer
Joined: Jul 2001
Posts: 369
Likes: 0
Re: Air Pump Replacement Pulley Kit (Vic'89)
It recyles emissions gasses I heard to make the engine burn cleaner for emissions, shouldn't have much of a negative effect without it.
I hear most people like it because it reduces down the number of things in the engine bay.... which reminds me I need to call and find out how my engine swap is doing... busy buying a house and I forgot about the critical thing I'm going to fill the garage with ;)
I hear most people like it because it reduces down the number of things in the engine bay.... which reminds me I need to call and find out how my engine swap is doing... busy buying a house and I forgot about the critical thing I'm going to fill the garage with ;)
Burning Brakes
Joined: Apr 2001
Posts: 904
Likes: 0
From: Langley, BC, Canada
Re: Air Pump Replacement Pulley Kit (notbob)
waste of money..buy a shorter belt and save your cash..im using an 85" belt instead of the stock 88.2" been on for over 6 months..no problems
Former Vendor
Joined: Jun 2001
Posts: 7,204
Likes: 6
From: St Marys PA
Re: Air Pump Replacement Pulley Kit (nsimmons)
nsimmons can you explain in more detail for the rest of us? Perhaps a diagram showing how you routed the belt? I'm looking forward to seeing this. Thanks
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Le Mans Master
Joined: Feb 2001
Posts: 6,398
Likes: 1
From: Loveland Co
Cruise-In III Veteran
Re: Air Pump Replacement Pulley Kit (ski_dwn_it)
Welcome, as soon as i get my website up and running i will post times and mods to show how i went from 15.6-15.8 at bandimere to 14.82. Depending on how much you want to spend 91's are really easy to make power with. I don't think i have more than $600 into performance on my car so it really isn't too expensive
Safety Car
Joined: Apr 1999
Posts: 4,623
Likes: 2
From: Ohio
Re: Air Pump Replacement Pulley Kit (nsimmons)
Nick, can you post the routing that you used? I think that it's different on an '84. The Camaro guys do it, but the C4 L98's have the PS pump I believe, in a different location. There is a diagram that I have somewhere that shows how they do it, but it's definitely different than a Corvette L98.
[Modified by h rocks, 10:40 AM 10/2/2001]
[Modified by h rocks, 10:40 AM 10/2/2001]
Burning Brakes
Joined: Apr 2001
Posts: 904
Likes: 0
From: Langley, BC, Canada
Re: Air Pump Replacement Pulley Kit (h rocks)
yeah the routing is different on an 84, but it shouldnt make a difference..I used the stock routing on my car, without the air pump you would need a belt 3"s shorter i simply routed it from over the top of the alternator, under the tensioner then over the a/c usually the belt goes from the alt, to the air pump, but in my case the belt just runs straight across the engine from the alt to ac, what i did was buy 5 belts from 87-82"s found the one that fit,a nd returned the others
Team Owner
Joined: Aug 2000
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From: Sydney, Australia
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St. Jude Donor '07-'08-'09-'10-'11-'12-'13-'14-'15-'16-‘17, '22
Re: Air Pump Replacement Pulley Kit (nsimmons)
I can't say for certain but I read here a while back that there is a difference. If memory serves me, if you try this method, the part where the belt runs from the air pump to the ac will foul the air intake duct on all models except the 84's.
Racer
Joined: Jul 2001
Posts: 368
Likes: 0
From: Tampa FL
Re: Air Pump Replacement Pulley Kit (Lexdog)
The air pump adds fresh air to the exhaust stream to make the catalyst more effective. That's all it is for. If you have no cats, or have gutted them, it is useless. By removing it, not only will you eliminate the mechanical loss in operating the pump, but you will also decrease the amount of work the exhaust system has to do. The only downsides are higher emissions (if you care about that sort of thing) and the cost of the replacement pulley.
The recycling that Notbob was referring to is the EGR system, it's not part of the air pump system.
http://forums.corvetteforum.com/zerothread?id=155378
I'm curious if a shorter belt would work like Nsimmons said. I'm pretty sure I looked and decided it wouldn't on mine, but I have an 86 and it is probably different from the 84.
[Modified by TJR, 2:02 PM 10/2/2001]
The recycling that Notbob was referring to is the EGR system, it's not part of the air pump system.
http://forums.corvetteforum.com/zerothread?id=155378
I'm curious if a shorter belt would work like Nsimmons said. I'm pretty sure I looked and decided it wouldn't on mine, but I have an 86 and it is probably different from the 84.
[Modified by TJR, 2:02 PM 10/2/2001]
