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Hp Gain on removing smog Equipment?

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Old 09-28-2003, 10:03 AM   #1
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Hp Gain on removing smog Equipment?

Can any one tell me if there is a worthwhile Hp increase by removing all smog equipment?
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Old 09-28-2003, 11:01 AM   #2
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Any info would be appreciated.
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Old 09-28-2003, 11:50 AM   #3
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no hp gain, just makes the engine bay less cluttered and easier on the eyes.
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Old 09-28-2003, 04:55 PM   #4
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It would shed a few pounds off also.
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Old 09-29-2003, 07:07 AM   #5
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cool
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Old 09-29-2003, 01:37 PM   #6
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depending on how much smog you are removing. If ALL of it is going, you could gain a few here and there. Losing the air pump could free up some poundage and lessen the parrasidic loss due to drag of the v/serp belt. Cat removal would be a good way to lessen backpressue and also bring more sound out of your car. Just make sure you re-tune your car due to the change in smog equipment. Removing EGR will cause you to get SES codes and also could lead into running rich.
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Old 09-29-2003, 02:00 PM   #7
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Originally posted by bigals87z28
depending on how much smog you are removing. If ALL of it is going, you could gain a few here and there. Losing the air pump could free up some poundage and lessen the parrasidic loss due to drag of the v/serp belt. Cat removal would be a good way to lessen backpressue and also bring more sound out of your car. Just make sure you re-tune your car due to the change in smog equipment. Removing EGR will cause you to get SES codes and also could lead into running rich.

the EGR isnt a smog componet and actually gives your better gas miliage when you're crusing down the hwy.... taking it off isnt a great idea.. ours are computer controled anyway, so they arnt on when you're flooring it for power... taking it off will only effect your gas miliage..


unless you go thru the work of setting up the car for no EGR... but theres no point in that since it isnt costing you anything.... unless you swap manifolds or somthing...
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Old 09-30-2003, 12:29 PM   #8
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Removing the egr does keep intake temps down a little though. But your not gonna go 14.5 to a 14.4 by losing it.
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Old 09-30-2003, 02:35 PM   #9
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Quote:
Originally posted by MrDude_1
the EGR isnt a smog componet and actually gives your better gas miliage when you're crusing down the hwy.... taking it off isnt a great idea.. ours are computer controled anyway, so they arnt on when you're flooring it for power... taking it off will only effect your gas miliage..


unless you go thru the work of setting up the car for no EGR... but theres no point in that since it isnt costing you anything.... unless you swap manifolds or somthing...
thats what I was getting to when i said running rich . And yes, Exhaust Gas Recirculation is a smog equipment.
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Old 10-05-2003, 03:48 PM   #10
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I removed my crap (I live in michigan). It makes it much easier to work around on the engine and not so much stuff sittin around in there. I have a pretty empty engine bay now that ive taken all of it out, and having an LG4 helps out too!
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Old 10-05-2003, 03:53 PM   #11
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When i removed mine it didnt effect performance noticeably at all, but sorry, I just realized I was in TPI board, but the equipment is similar I'm sure. Does anyone know how to get rid of the tube sticking out of my manifold now? it is ugly and everyone asks why it is open. I tried to take off the nut holding it on and damn they are tight.
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Old 10-05-2003, 03:56 PM   #12
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best thing i did to my engine bay, was get headers with no air tubes, remove a.c, remove air pump and lines.

Click the image to open in full size.
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Old 10-05-2003, 08:41 PM   #13
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My car felt like it had more response.

Got no proof though.
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Old 10-06-2003, 01:39 PM   #14
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when i removed all my a/c and smog equipment i noticed a 50-60 more miles out of a tank of gas.

plus it's a lot less clutter in the engine bay.

http://www.fbody.com/members/MNFormu...mulaengine.jpg

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Old 10-06-2003, 01:57 PM   #15
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Losing the air pump could free up some poundage and lessen the parrasidic loss due to drag of the v/serp belt.
Not likely. Under WOT, the AIR diverter valve switches to 'dump' anyway, so there is virtually zero drag due to the pump.
The main reason not to remove the EGR is because the ECM is tuned to work with it, if you are willing to get a custom PROM to program it out, theres no reason to keep it. If youre using the stock programming, keep the EGR.
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Old 10-10-2003, 01:20 AM   #16
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I took off the cat first. Then when I got headers I dropped the Air pump. When I drop in my new motor over the weekend I'll take off the a/c since I got the 1LE pully for it. I had tuning issues but when I dropped the emmisions stuff I reset the computer by unhooking the battery then the car started to really pick up so I think It made a big diffence for me. But also I think the bearings in the pump were shot too so...
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Old 10-10-2003, 02:57 AM   #17
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when i first got it i was curious as to what it was, and i found out that it just pumped air into my exhaust manifolds , is this really better for air wtf?, so i decided just to remove it. At the time I was getting weird mixture, and i was backfiring when i let off the gas, so I removed the whole smog pump and lines, and it stopped backfiring.
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Old 10-10-2003, 04:59 AM   #18
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Quote:
Originally posted by Dave84Bird
when i removed all my a/c and smog equipment i noticed a 50-60 more miles out of a tank of gas.

plus it's a lot less clutter in the engine bay.

http://www.fbody.com/members/MNFormu...mulaengine.jpg

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WOW.

That is a gain and a half. Horsepower be damned. I'd rather have the 50-60 miles to a tank better milage...
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Old 03-10-2004, 01:11 AM   #19
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Could you post pics and supply details on how and what parts to remove when eliminating the AIR pump.

Thanks in advance.
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Old 03-11-2004, 03:17 PM   #20
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its in one of the tech articles
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Old 03-13-2004, 04:04 AM   #21
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Quote:
Originally posted by formularpm
Not likely. Under WOT, the AIR diverter valve switches to 'dump' anyway, so there is virtually zero drag due to the pump.
But for how long are you at WOT?
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Old 03-13-2004, 05:50 PM   #22
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a good way to keep it legal and free up some hp is get a exhaust cutoff from summit or jegs, and weld that just after the headers. then you can flip a switch and run open exhaust, switch it again and you run it through the exhaust system. its a good way to keep it legal, avoid troble with cops and at the same time free up some backpressure when you need the extra hp and the growl. give it a try!
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Old 03-13-2004, 06:02 PM   #23
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But for how long are you at WOT?
14.6 seconds with the old engine. Hopefully 12.5 seconds with the new one. I dont think anyone uses part throttle when racing. Anyway, the point of my reply was not to have any delusions of gaining any real power by removing the pump. Mine had a noisy bearing, that was reason enough for me.
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Old 03-13-2004, 06:14 PM   #24
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Quote:
Originally posted by FastBack
a good way to keep it legal and free up some hp is get a exhaust cutoff from summit or jegs, and weld that just after the headers. then you can flip a switch and run open exhaust, switch it again and you run it through the exhaust system. its a good way to keep it legal, avoid troble with cops and at the same time free up some backpressure when you need the extra hp and the growl. give it a try!
That is not true, in Illinois it is illegal to just have cutouts on your car here is a quote from the vehicle code:

Quote:
(625 ILCS 5/12‑602) (from Ch. 95 1/2, par. 12‑602)
Sec. 12‑602. Mufflers, prevention of noise.
Every motor vehicle driven or operated upon the highways of this State shall at all times be equipped with an adequate muffler or exhaust system in constant operation and properly maintained to prevent any excessive or unusual noise. No such muffler or exhaust system shall be equipped with a cutout, bypass or similar device. No person shall modify the exhaust system of a motor vehicle in a manner which will amplify or increase the noise of such vehicle above that emitted by the muffler originally installed on the vehicle, and such original muffler shall comply with all the requirements of this Section.
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Old 03-13-2004, 07:05 PM   #25
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I saw no increase in mph or decrease in elapsed times on an 1/8th mile track when I removed my smog equipment, pump, piping, etc.

It did; however, cut the amount of time in half that it takes to change spark plugs, wires, sensors, etc.
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