power loss from smog equipment
06-07-2006, 03:59 PM
#11
3rd Gear Member
Join Date: Apr 2006
Posts: 506
RE: power loss from smog equipment
I have dyno'd my car with a catted x-pipe & without cat's x-pipe. No other changes & each time tuned to make the best numbers.... 323rwhp\309rwtq without & 296 \ 294 with cat's..... This is a simple bolt-on motor \ HCI....
So yes.... I'd tend to agree that the more power you make; the more the cat's will affect the power numbers.....
So yes.... I'd tend to agree that the more power you make; the more the cat's will affect the power numbers.....
06-07-2006, 07:09 PM
#13
I ♥ Acer
Join Date: Sep 2004
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Posts: 1,130
RE: power loss from smog equipment
ORIGINAL: anthonydalrymple
I have dyno'd my car with a catted x-pipe & without cat's x-pipe. No other changes & each time tuned to make the best numbers.... 323rwhp\309rwtq without & 296 \ 294 with cat's..... This is a simple bolt-on motor \ HCI....
So yes.... I'd tend to agree that the more power you make; the more the cat's will affect the power numbers.....
I have dyno'd my car with a catted x-pipe & without cat's x-pipe. No other changes & each time tuned to make the best numbers.... 323rwhp\309rwtq without & 296 \ 294 with cat's..... This is a simple bolt-on motor \ HCI....
So yes.... I'd tend to agree that the more power you make; the more the cat's will affect the power numbers.....
06-07-2006, 07:16 PM
#14
6th Gear Member
Join Date: Feb 2005
Location:
Posts: 8,439
RE: power loss from smog equipment
I noticed a power decrease in the vert when I removed all of the smog equipment. What are you supposed to do with all of the loose vacuum hoses and stuff after the tubes are removed?
06-07-2006, 07:33 PM
#15
3rd Gear Member
Join Date: May 2006
Location: THE AlbuCrackie,NM
Posts: 843
RE: power loss from smog equipment
ORIGINAL: cybermecium
If you removed the smog pump, cats, and put a CAI on, you would not only find yourself with a noticable increase in power, but also much better throttle response (esp. with the CAI) and a little bit better gas mileage, not to mention a much better sound without the cats. Smog pump is a parasitic loss of HP on the engine, and the stock intake as well as the cats are restrictions in your intake and exhaust (try plugging your nose and breathing through a straw in ur mouth.) Even if the HP gain is only 10hp, your engine will run cooler, last longer, and use less gas.
If you removed the smog pump, cats, and put a CAI on, you would not only find yourself with a noticable increase in power, but also much better throttle response (esp. with the CAI) and a little bit better gas mileage, not to mention a much better sound without the cats. Smog pump is a parasitic loss of HP on the engine, and the stock intake as well as the cats are restrictions in your intake and exhaust (try plugging your nose and breathing through a straw in ur mouth.) Even if the HP gain is only 10hp, your engine will run cooler, last longer, and use less gas.
The Kid seconds the info!
The main power you would see would be from disabling the Smog/AIR pump and removing the CAT(s), everything else is so minute that you wouldn't even tell unless you were rocking some serious RPMs.
Great luck to you,
Ivan
06-09-2006, 02:07 AM
#16
3rd Gear Member
Join Date: Apr 2006
Posts: 506
RE: power loss from smog equipment
ORIGINAL: Grimace5.0
Not trying to nit pick but was the "test" done back to back? The same day, same dyno, same dyno operator, same weather conditions?
ORIGINAL: anthonydalrymple
I have dyno'd my car with a catted x-pipe & without cat's x-pipe. No other changes & each time tuned to make the best numbers.... 323rwhp\309rwtq without & 296 \ 294 with cat's..... This is a simple bolt-on motor \ HCI....
So yes.... I'd tend to agree that the more power you make; the more the cat's will affect the power numbers.....
I have dyno'd my car with a catted x-pipe & without cat's x-pipe. No other changes & each time tuned to make the best numbers.... 323rwhp\309rwtq without & 296 \ 294 with cat's..... This is a simple bolt-on motor \ HCI....
So yes.... I'd tend to agree that the more power you make; the more the cat's will affect the power numbers.....
There is no stupid questions & yours are intelligent ones. I figure the real loss being 20rwhp & 10rwtq losses; not more as it would seem. I had no intention of doing what i did; it was simply my not being happy with the fuel fumes.....
I really do miss the power; i run 2 tenths slower in the quarter average than I did without the cat's...IMHO
06-09-2006, 02:34 AM
#17
3rd Gear Member
Join Date: May 2006
Location:
Posts: 792
RE: power loss from smog equipment
if they weren't done back to back with the same operator that test doesnt prove much.
there was a big article in my Modified Mustangs Magazine about dynos and how much room for error there is.
theres so many things that can be different in each dyno, you could have changed nothing
and with a different operator and date and what-not, and put down the same difference in numbers.
there was a big article in my Modified Mustangs Magazine about dynos and how much room for error there is.
theres so many things that can be different in each dyno, you could have changed nothing
and with a different operator and date and what-not, and put down the same difference in numbers.
06-09-2006, 11:19 PM
#19
3rd Gear Member
Join Date: Apr 2006
Posts: 506
RE: power loss from smog equipment
ORIGINAL: Stevens91gt
you can get hi flow cats
ORIGINAL: LOUDexhaust
Thats pretty convincing. Are those stock cats? Are there good aftermarket ones?
Thats pretty convincing. Are those stock cats? Are there good aftermarket ones?
06-09-2006, 11:36 PM
#20
RE: power loss from smog equipment
you have to look at it like this, eliminating the weight of the smog pump and eliminating a pulley you get maybe +2 hp? its a little noticeable diff, atleast i noticed a diff. with UD pulleys and having factory ac its a 77 inch belt to delete your smog pump. hope that helps