Advantages Of Smog Delete?
- Thread starter Joey5.0
- Start date
Bypass it with shorter belt -OR- buy a delete kit (like this one from UPR: http://www.uprproducts.com/shopping/shopexd.asp?id=194). UPR site has instructions too!
Fixed link.
It pumps oxygenated air to the exhaust side of cylinder heads and to just before the cat. converters.
It is intended to allow further burning of gas after the engine prior to the cats...better/cleaner emissions.
It is illegal to remove...but I just ordered mine last night (I have a UPR A/C delete and I love it, great quality).
By removing it, if you have cats, they will wear out quicker (supposedly).
Removing it cleans up engine bay (it is under the alternator on passenger side with tubes running out behind it), reduces weight from the car (more importantly, from the front end), and reduces parasitic loss/drag it places on the crank pulley system.
It pumps oxygenated air to the exhaust side of cylinder heads and to just before the cat. converters.
It is intended to allow further burning of gas after the engine prior to the cats...better/cleaner emissions.
It is illegal to remove...but I just ordered mine last night (I have a UPR A/C delete and I love it, great quality).
By removing it, if you have cats, they will wear out quicker (supposedly).
Removing it cleans up engine bay (it is under the alternator on passenger side with tubes running out behind it), reduces weight from the car (more importantly, from the front end), and reduces parasitic loss/drag it places on the crank pulley system.
MrKwik
Founding Member
Never seen a "noticable" power gain from deleting the smog pump myself. The only advantage to me is cleaning up the engine bay some. If I ran cats I would probably keep it, especially if I lived in a state with any kind of inspections.
Michael Yount
Mustang Master
Very little power to be gained by deleting the smog pump or egr systems. And detonation can be a problem if the EGR is removed without turning off the function in the ecu (chip, tweecer, etc.). Aside from cleaning up the engine bay, there is little performance reason to remove that stuff. The EGR doesn't function at w.o.t. anyway; gas mileage may actually drop without the egr.
The car WILL usually benefit from a larger diameter exhaust exhaust system with high flow cats. If you're gonna run the cats, probably a good idea to leave the pump on.
The car WILL usually benefit from a larger diameter exhaust exhaust system with high flow cats. If you're gonna run the cats, probably a good idea to leave the pump on.
Michael Yount
Mustang Master
I agree - aesthetics and access are the only viable reason to remove the stuff. Having said that, somehow all of mine went missing when I pulled my motor to do H/C/I....used a chip to turn off the thermactor and egr functions in the ecu.
Yount beat me to it. There really is no use to removing the smog unless you want the cleaner engine bay. But again, the pump mounts so low its hard to see anyways. The smog pump itself has next to no parasitic drag on it and is supposedly good for like 1 horsepower max gain. The weight loss is nominal at best. Have you ever held a smog pump? They weigh next to nothing. If you are using a catted pipe then keep the pump and do us air breathers a favor. Losing the AC on the other hand is a big loss of weight and a fair power increase noticable on a dyno.
Michael Yount
Mustang Master
Deleting the a/c adds absolutely no HP at all. The a/c clutch freewheels when the a/c isn't on. And the computer turns the a/c off at full throttle even if the driver hasn't. The only benefit to removing all the a/c equipment is a weight reduction -- which could be noticeable. Not sure how in the heck weight loss is gonna show up on the dyno though....
i agree that the AC system does weigh a lot... but how much hp could it drag away from the crank pulley when its not active? the thing just spins when the clutch isnt engaged. i wouldnt even bet that 1hp is lost. i personally have mine on still just because i havnet bought the march AC delete bracket. it just sits there without anything else hooked up.
I can say that the A/C does indeed have a good bit of weight. Between the compressor, the condensor, the accumulator, and all of the hoses and fittings, it adds up to be a decent amount. I would ballpark 25-35 lbs altogether. I have not taken the smog off yet - awaiting pulley from UPR. When I do, I will use my digital postal scale (maxes at 10 lbs) and see what it weighs.
i live in alabama where smog is not required,so i installed all 2.5 inch flowmaster offroad exhaust. when i removed all the smog equipmen i gained 3 tenths in the eighth. this could be attributed to two different things a. less belt run meant less parisitic drag
b. loss of over 30 lbs worth of smog pump lines, smog pump, and the smog tubes behind the heads and going down to the h-pipe. either way 3 tenths is 3tenths and that equates to about 17 hp gained or just the loss of weight, maybe both
b. loss of over 30 lbs worth of smog pump lines, smog pump, and the smog tubes behind the heads and going down to the h-pipe. either way 3 tenths is 3tenths and that equates to about 17 hp gained or just the loss of weight, maybe both
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