Hp Gain on removing smog Equipment?
Supreme Member
Joined: Nov 2001
Posts: 4,456
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From: Ocean, NJ
Car: Check The Sig
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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Joined: Jun 2001
Posts: 9,550
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From: Charleston, SC
Car: 91 Camaro Vert
Engine: 02 LS1, HX40
Transmission: 2002 LS1 M6
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.
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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Supreme Member
Joined: Nov 2001
Posts: 4,456
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From: Ocean, NJ
Car: Check The Sig
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...
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...
. And yes, Exhaust Gas Recirculation is a smog equipment. 
Member
Joined: May 2003
Posts: 117
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From: A STATE WITH NO EMMISIONS LAWS!!!!!
Car: 1986 Z28
Engine: LG4 305ci
Transmission: T5
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!
Member
Joined: May 2003
Posts: 117
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From: A STATE WITH NO EMMISIONS LAWS!!!!!
Car: 1986 Z28
Engine: LG4 305ci
Transmission: T5
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.
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
copy and paste link for pic
plus it's a lot less clutter in the engine bay.
http://www.fbody.com/members/MNFormu...mulaengine.jpg
copy and paste link for pic
Senior Member
Joined: Sep 2002
Posts: 984
Likes: 55
From: Nebraska
Car: '89 Formula
Engine: 355
Transmission: 700R4
Axle/Gears: 9 bolt
Losing the air pump could free up some poundage and lessen the parrasidic loss due to drag of the v/serp belt.
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.
Member
Joined: Aug 2003
Posts: 126
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From: Illinois
Car: 89 TA
Engine: 413 TPI
Transmission: TKO 600
Axle/Gears: 3.42
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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Joined: Feb 2001
Posts: 451
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From: Keller, TX
Car: 06 Toyota Tundra SR5
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.
Junior Member
Joined: May 2003
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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
copy and paste link for pic
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
copy and paste link for pic
WOW.
That is a gain and a half. Horsepower be damned. I'd rather have the 50-60 miles to a tank better milage...
Member
Joined: Jun 2003
Posts: 233
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From: IN THE LBC
Car: 1988 IROC CONVERTIBLE
Engine: 305 TPI PAXTON SUPERCHARGER & NOS
Transmission: T5
Could you post pics and supply details on how and what parts to remove when eliminating the AIR pump.
Thanks in advance.
Thanks in advance.
Supreme Member
Joined: Nov 2001
Posts: 4,456
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From: Ocean, NJ
Car: Check The Sig
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.
Not likely. Under WOT, the AIR diverter valve switches to 'dump' anyway, so there is virtually zero drag due to the pump.
Member
Joined: May 2003
Posts: 110
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From: Cedar Grove, Wisconsin
Car: 91' Firebird Formula WS6
Engine: 305 TPI
Transmission: TH700R4
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!
Senior Member
Joined: Sep 2002
Posts: 984
Likes: 55
From: Nebraska
Car: '89 Formula
Engine: 355
Transmission: 700R4
Axle/Gears: 9 bolt
But for how long are you at WOT?
Supreme Member
Joined: Jan 2004
Posts: 1,206
Likes: 4
From: Western Ky
Car: Z/28..39 Plymouth truck in progress
Engine: S/B
Transmission: Manual
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!
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!
(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.
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.
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.
It did; however, cut the amount of time in half that it takes to change spark plugs, wires, sensors, etc.
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