corvette smog pump
corvette smog pump
03-26-02, 11:05 AM
#4
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I doubt it would give you any more power....
Removing the air pump will only give you a small increase in power (and kills your aux intake ports)
So, getting a smaller one I beleive would be pointless.- It's still pumping extra air into the exhaust, and still exerting a small amount of parasitic drag on the engine. (1/8 horse versus 1/4 horse to turn them maybe!!)
Unless there is something I havn't heard about, there are LOTS better ways to spend a Saturday with your head under the hood than by swapping in a different air pump! (Read: install a turbo
)
Removing the air pump will only give you a small increase in power (and kills your aux intake ports)
So, getting a smaller one I beleive would be pointless.- It's still pumping extra air into the exhaust, and still exerting a small amount of parasitic drag on the engine. (1/8 horse versus 1/4 horse to turn them maybe!!)
Unless there is something I havn't heard about, there are LOTS better ways to spend a Saturday with your head under the hood than by swapping in a different air pump! (Read: install a turbo
)
03-26-02, 11:23 AM
#5
I agree with you on the fact that the pump probably doesn't eat up any horsepower, however I would like to remove the ACV and other things from that side of the motor (to kinda clean things up).
I also have a buddy with a 3rd Gen that is contemplating a single turbo upgrade. There is no space for an airpump with his future set up.
I also have a buddy with a 3rd Gen that is contemplating a single turbo upgrade. There is no space for an airpump with his future set up.
03-26-02, 11:31 AM
#6
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Vettes
I believe the vettes use an electric air pump, which gives you alot of flexability as far as where you're going to place it. As well as the many benefits of removing the stock airpump, for those who still want to stay smog legal.
03-26-02, 11:49 AM
#7
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Electric air pump- That's a different story- may be worth the swap, but still won't really gain any power if you still have the cats.
Usually, people go to an electric pump because they don't want the drag on the engine, and they have no cats, so they don't need the extra air flowing through the exhaust (kills power) BUT they want their aux valves and VDI (89+) to be functional.
Usually, people go to an electric pump because they don't want the drag on the engine, and they have no cats, so they don't need the extra air flowing through the exhaust (kills power) BUT they want their aux valves and VDI (89+) to be functional.
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03-26-02, 12:22 PM
#8
I actually have an 88 TII. The air pump is only needed for pollution.
I have no cats currently, however I would like to be able to put a cat on there w/o messing with the air pump every time I need to take the car to the EPA.
The Electric pump could stay there and take up very little space in the mean time.
I believe that Brian Cain has the pump set up in his car.
I have no cats currently, however I would like to be able to put a cat on there w/o messing with the air pump every time I need to take the car to the EPA.
The Electric pump could stay there and take up very little space in the mean time.
I believe that Brian Cain has the pump set up in his car.
03-26-02, 12:37 PM
#9
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Yep. Last year I used a '97 Vette LS1 factory electric smog pump to pass emissions. At the time, the cost was $180 beans and wound up being nearly $200 with state tax added unto it. With it plumbed into the catalytic convertor, it worked great! I've got some pictures around here somewhere of it ...
http://bdc.genxracing.com/CorvetteSmogPump
That oughta give you some ideas of installation. It's pretty easy.
B
http://bdc.genxracing.com/CorvetteSmogPump
That oughta give you some ideas of installation. It's pretty easy.
B
03-26-02, 03:10 PM
#11
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How the pump was run? It's pretty easy:
The pump has (3) leads on it; Red, Orange, and Black. I'm still not certain what the difference is between the Red and Orange since they're both +12VDC power but I suspect one is for constant run and the other is for switched for whatever condition the original Corvette ECU had in mind for it.
Since you're not running any aftermarket EFI that can control this sort of thing, I recommend wiring it to a switch, relayed, to switched +12VDC power. Splice the Red and Orange leads together and run them to a relay as the 'Power to Lamps' output. Run the Black lead straight to chassis or battery ground. From there, find an adequate lead for your 'Switching Lead' and splice in your manual switch (in your cockpit somewhere) here. It works like a champ. Sounds pretty neat, too; makes a real high-pitched whistle.
I can't remember what I had the pump fused at but I recommend starting w/ a 10A fuse. This oughta work.
B
By the way, where'd you hear about the 'Vette pump?
The pump has (3) leads on it; Red, Orange, and Black. I'm still not certain what the difference is between the Red and Orange since they're both +12VDC power but I suspect one is for constant run and the other is for switched for whatever condition the original Corvette ECU had in mind for it.
Since you're not running any aftermarket EFI that can control this sort of thing, I recommend wiring it to a switch, relayed, to switched +12VDC power. Splice the Red and Orange leads together and run them to a relay as the 'Power to Lamps' output. Run the Black lead straight to chassis or battery ground. From there, find an adequate lead for your 'Switching Lead' and splice in your manual switch (in your cockpit somewhere) here. It works like a champ. Sounds pretty neat, too; makes a real high-pitched whistle.
I can't remember what I had the pump fused at but I recommend starting w/ a 10A fuse. This oughta work.
B
By the way, where'd you hear about the 'Vette pump?
03-26-02, 03:17 PM
#12
I had been talking to the guys that are opening up a new shop in the Chicago Area (A Spec Tuning). They mentioned using it on 3rd gens during single turbo conversions and I remembered seeing your pics a while back. May have been on the old team fc3s list.
More importantly, did you pass emisions?
More importantly, did you pass emisions?
03-26-02, 03:21 PM
#13
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Aaah, ok. I bet they got the information from Mike Haun, then. He's been putting together some 3rd gen pump/cat combo stuff for those guys last time he told me.
Did I pass emissions? Look for yourself; before the pump w/ catalytic convertor only and then after w/ the pump and cat together.
http://bdc.genxracing.com/Inspection
B
Did I pass emissions? Look for yourself; before the pump w/ catalytic convertor only and then after w/ the pump and cat together.
http://bdc.genxracing.com/Inspection
B
03-26-02, 03:42 PM
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I'm not honestly sure if the latter is true or not. I used a pretty durn large cat-convertor used for a 5.7L V8 engine (350cu/in displacement) so I figured using this pump actually matches it. Considering the amount of air that passes through the exhaust, the airpump output air is negligible. I believe that having the pump in-place, rather, made the convertor work in the first place and sufficiently do its combustive duties. I think if it were straight dilution the actual Dilution figures would be much higher. I could be wrong on all of this, though. I just don't know. The exhaust did smell much cleaner and it started to emit small droplets of water which is one after-effective of a catalytic convertor operation. I think main it's just from using a large convertor/air pump pair on a smaller displacement engine that made it luckily work so well.
B
I think if it were straight dilution the actual Dilution figures would be much higher. I could be wrong on all of this, though. I just don't know. The exhaust did smell much cleaner and it started to emit small droplets of water which is one after-effective of a catalytic convertor operation. I think main it's just from using a large convertor/air pump pair on a smaller displacement engine that made it luckily work so well.B
03-26-02, 06:06 PM
#16
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Was 97' the 1st year they started using epumps? I like to save a little if they had one back in the early 80s. You think the output was over 3 psi so it can open up the aux ports and vdi?
03-26-02, 06:44 PM
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Originally posted by ka8legend
Was 97' the 1st year they started using epumps? I like to save a little if they had one back in the early 80s. You think the output was over 3 psi so it can open up the aux ports and vdi?
Was 97' the 1st year they started using epumps? I like to save a little if they had one back in the early 80s. You think the output was over 3 psi so it can open up the aux ports and vdi?
B
04-26-02, 12:25 PM
#19
I did the same thing after Brian. I am being hassled in Az becasue I didn't have the ACV installed. I did pass the sniffer before I tried to rig the ACV into the loop. 
I'm still working on it with the ACV. One thing, these pumps are not designed for continuous running. I was told 2min duty cycle by a vette guy. I picked mine up for $35 shipped off ebay. They appear quite regularly there
I'm still working on it with the ACV. One thing, these pumps are not designed for continuous running. I was told 2min duty cycle by a vette guy. I picked mine up for $35 shipped off ebay. They appear quite regularly there
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