 » Site Navigation | | | | » Recent Threads | | | |  |  |  |  04-21-2006, 03:49 PM | #1 | | Senior Member Join Date: May 2005 Location: Indianapolis, IN Posts: 228 |  Can cats rob HP?
I'm curious if a malfunctioning catalytic converter can rob power? The torque above 3500rpm in our Z3 feels crappy compared to the 318ti, and they both have the same engine. But the Z3's converter is crap and I'm in the process of replacing it. I just wondered if the cat could rob power, and if I should expect the pep to return to its step after the operation. |  |  | | 04-21-2006, 04:01 PM | #2 | | Senior Member Join Date: Feb 2006 Location: Montclair, VA Posts: 338 |
yes indeedy.. anything restricting outgoing airflow can inturn reduce the amount of availabe power, due to the fact that residual airflow stacks up and causes pretty much poor acceleration yet you should be able to top speed the same  __________________
[SIZE="1"]Current: Cooler, Intake, Headers, Valves, MAF, Exhaust, HIDS (white/blue), 17" ASA tuner with low-pros, tint, dvd/audio, I stand strong; Life's a slinky. | | | | | 04-21-2006, 04:02 PM | #3 | | Senior Member Join Date: Feb 2006 Location: Montclair, VA Posts: 338 |
is it a collapsed cat.. do you know? __________________
[SIZE="1"]Current: Cooler, Intake, Headers, Valves, MAF, Exhaust, HIDS (white/blue), 17" ASA tuner with low-pros, tint, dvd/audio, I stand strong; Life's a slinky. | | | | | 04-21-2006, 04:32 PM | #4 | | Senior Member Join Date: May 2005 Location: Indianapolis, IN Posts: 228 |
Quote: | Originally Posted by halobeamin yes indeedy.. anything restricting outgoing airflow can inturn reduce the amount of availabe power, due to the fact that residual airflow stacks up and causes pretty much poor acceleration yet you should be able to top speed the same | This is indeed the case, I can reach speed okay, but acceleration sucks. I'm talking GAS IT at 70 mph and count to 10 as I reach 80 mph. I'm not sure if it's collapsed or not because I'm not sure what that means! heh It's loud as hell and I have an 07-28 error code. "Catalyst Effeciency" i think it is. | | | | | 04-21-2006, 04:43 PM | #5 | | Senior Member Join Date: Jan 2006 Location: Tacompton, WA Posts: 309 |
just add some stickers! it will give you all your hp back! __________________ 95 318ti Alpine white, E46 m3 front bumper, Clear Corners, Cosmo CAI, k&n filter, Flowmaster catback, front strut bars, sony 12" sub Kenwood 800watt amp & Aiwa Deck, stickers
Future: Angel Eyes, Drop, Rims, and rear bumper
318ti.org sticker (added 100HP) | | | | | 04-21-2006, 05:02 PM | #6 | | TRETEN IRGENDEINES ESELS Join Date: Aug 2004 Location: Rhode Island Posts: 3,687 |
Quote: | Originally Posted by Severian This is indeed the case, I can reach speed okay, but acceleration sucks. I'm talking GAS IT at 70 mph and count to 10 as I reach 80 mph. I'm not sure if it's collapsed or not because I'm not sure what that means! heh
It's loud as hell and I have an 07-28 error code. "Catalyst Effeciency" i think it is. | If your cat was collapsed you'll notice it at any speed not just high speeds. When my cat was gone it took me 20 seconds to get up to 30mph. Pulling onto the highway is a nightmare,throw on your hazards and pick up spped in the break down lane before you pull out. And yes it would be quicker without the cat on the ti but you'd only gain 1-2hp if that. __________________ 98 Avus Blue 318 ti Active
clear outs all around,stealth turning signals,blue led interior lights, 35% tinted windows,K&N air filter, 12" Kenwood Sub, MTX Thunder Amp,Alpine cd changer, Leatherz Armrest,ACS Pedals/Handbrake/FloorMats & Vitesse Tuning Carbon Fiber B-Pillars/CF Spark Plug Cover, New 16" MSW Typer 14 Rims on Goodyear Triple Treds 
www.myspace.com/avusblueti | | | | | 04-21-2006, 05:17 PM | #7 | | Senior Member Join Date: Mar 2006 Location: Norfolk, Virginia Posts: 289 |
"just add some stickers! it will give you all your hp back!"
Totally! When i put my H&R and AC Schnitzer stickers
on my Z3, well....all i can say is WOW!!!!! __________________ _____________________________________________
Cold air, Dual Exhaust, Ellipsoid headlights, CCFL Angel Eyes, custom ICE, M3 wheels, Cobra Radar Detector, CF eyebrows, ACS CF gauge bezel, clear corners, Euro tail lights.
Stickers add HP!!!  | | | | | 04-21-2006, 05:43 PM | #8 | | Senior Member Join Date: Sep 2004 Location: Manassas, VA Posts: 4,129 |
I imagine if the cat got caught in the air intake, it could severly reduce your horsepower  __________________ 
1998 (July) 318ti, 5-spd
OEM Armrest Blaupunkt Heidelberg CD50 CD Player/Compact Drive MP3 Player Diamond Audio 5.25" rear speakers Navman ICN 530 GPS BMWALARM.COM (with comfort settings) after market alarm system Magnecor 8.5mm wires M-Z3 Shifter/Momo Knob Burlwood Dashboard Stromung Exhaust X-brace Racing Dynamics Front Strut Bar Carbonio C.A.I. 17" Rial Rims Vader Seats/Heated/Lumbar Support M-tech Steering Wheel/Front Sway Bar/Front & Rear Bumper Depos/w 6500K Angel Eyes/6000K HIDs Clear Corners M3 Mirrors UUC Light Weight Flywheel/M5 Clutch/M3 Clutch Slave E28 3.46 LSD/Mcoupe Cover/E30 Flanges & Halfshafts UUC S.S. Brake/Clutch Lines Hartge Roof Spoiler BavAuto Springs Bilstein Sport Struts/Shocks E46 M3 Rear Shock Mounts SPC Front Camber Kit Reiger Hatch Spoiler BavAuto Rear Camber Kit Dinan Stage II Software Turner Rear Sway Bar Reinforcements BMW E46 Auto dimming mirror with Clown Nose alarm Engine Compartment Light Heated Wiper Fluid Retrofit OEM Fire Extinguisher Da'lan Trailer Hitch Rear Sun Shade OEM Fog Light Retrofit H & R MZ3 Rear Sway Bar/ UUC Adjustable End Links Cruise Control Retrofit On Board Computer Retrofit M3 twistie style side skirts Carbon Fiber Hood | | | | | 04-21-2006, 05:45 PM | #9 | | Senior Member Join Date: Mar 2006 Location: Norfolk, Virginia Posts: 289 |
I think you should check and see if there are any small rodents in your CAT, i dont think the car would run real well if there was a gerbil stuck in your exhaust.  __________________ _____________________________________________
Cold air, Dual Exhaust, Ellipsoid headlights, CCFL Angel Eyes, custom ICE, M3 wheels, Cobra Radar Detector, CF eyebrows, ACS CF gauge bezel, clear corners, Euro tail lights.
Stickers add HP!!! | | | | | 04-21-2006, 06:14 PM | #10 | | Moderator Join Date: Jun 2003 Location: Bouncing off the rev limiter in CT! Posts: 3,156 |
Quote: | Originally Posted by USMC318ti I dont think the car would run real well if there was a gerbil stuck in your exhaust. | I thought that was Richard Geere's problem???? | | | | | 04-21-2006, 06:37 PM | #11 | | Senior Member Join Date: May 2005 Location: Indianapolis, IN Posts: 228 |
If i was gonna fit the title of this thread in the "recent posts" bar on the left there was no way to avoid using the word cat. Therefore pussy jokes are mandatory I MEAN PUSSY CAT JOKES, pussy CAT jokes! | | | | | 04-21-2006, 08:33 PM | #12 | | Senior Member Join Date: Feb 2006 Location: Montclair, VA Posts: 338 |
Quote: | Originally Posted by J!m I thought that was Richard Geere's problem???? | hahahahaha __________________
[SIZE="1"]Current: Cooler, Intake, Headers, Valves, MAF, Exhaust, HIDS (white/blue), 17" ASA tuner with low-pros, tint, dvd/audio, I stand strong; Life's a slinky. | | | | | 04-21-2006, 08:34 PM | #13 | | Senior Member Join Date: Feb 2006 Location: Montclair, VA Posts: 338 |
dude i'd just go have your CATALYTIC CONVERTER looked at, and it mostly like is going to need replaced.. if i remember right, you wanted to add a Supersprint system??
if so.. just go have from the converter back replaced and installed.. i'm sure that's what it is __________________
[SIZE="1"]Current: Cooler, Intake, Headers, Valves, MAF, Exhaust, HIDS (white/blue), 17" ASA tuner with low-pros, tint, dvd/audio, I stand strong; Life's a slinky. | | | | |
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