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| Catalytic converter delete (Page 2/3) |
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theogre
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DEC 01, 01:09 PM
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Removing the Cat Does Nothing for Performance or Heat. Removing a Cat or any Emissions parts have been illegal since ~ 1975 regardless of state rules.
If the Cat is plugged/bad then very likely have engine problems burning oil etc. Just replacing a cat on a iffy engine just wrecks it often fast.
Many Myths claiming Fiero Engine Bay Heat is Higher the Front Engine cars... Is completely  .
If the car is moving even a little then a lot of air is moving around the engine etc then out thru the lid vents and so on.
See http://www.fiero.nl/forum/Forum2/HTML/141784.html
I'd be worried about Cabin Temp parked outside in sunny days... even in cool weather, can kill kids and other things when hits 140°F or more.
Yes, most cars run hotter then whatever T-stat says. But don't trust a dash gauge to read engine temp. Use ECM scanner or other methods.
If Coolant temps are hotter then ~ 230°F most to all the time... or Temp spikes at idle, most so in cool/cold weather...
Read my Cave, Thermostat, Crushed Pipe and rest of section.
Anything blocking coolant flow will cause problems. Normal T-stat will fake a problem in second issue.------------------
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)
The Ogre's Fiero Cave
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Dennis LaGrua
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DEC 03, 01:49 PM
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| quote | Originally posted by theogre:
Removing the Cat Does Nothing for Performance or Heat. Removing a Cat or any Emissions parts have been illegal since ~ 1975 regardless of state rules.
If the Cat is plugged/bad then very likely have engine problems burning oil etc. Just replacing a cat on a iffy engine just wrecks it often fast.
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But it does eliminate the no. 1 cause of fire caused by oil leaks. A leaky valve cover gasket causing some oil dripping down on a cat that operates at a normal operating temperature of 1200*F-1600* F and there's your fire. It only takes a few drops of oil on that piece of equipment to start a fire and your Fiero goes up in smoke. For a show or hobby car I certainly see no need for a CAT.
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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "
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Mickey_Moose
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DEC 03, 01:54 PM
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| quote | Originally posted by theogre:
Yes, most cars run hotter then whatever T-stat says. But don't trust a dash gauge to read engine temp. Use ECM scanner or other methods.
If Coolant temps are hotter then ~ 230°F most to all the time... or Temp spikes at idle, most so in cool/cold weather...
Read my Cave, Thermostat, Crushed Pipe and rest of section.
Anything blocking coolant flow will cause problems. Normal T-stat will fake a problem in second issue.
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If the chin spoiler on the front is also missing it can also lead to the car overheating on the highway - I learned this the hard way. 
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Falstaff
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DEC 06, 01:04 PM
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I cut the cat off mine a long time ago. Completely useless and gets in the way. There is zero inspection of any kind in Michigan so when the cat clogs, rusts or the car just becomes old the cat is removed. Sure it's illegal Federally, but nobody is enforcing it.
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fierofool
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DEC 06, 01:15 PM
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I've removed the converter on one of my cars over 10 years ago, and it does give it a little louder exhaust note. The only time I've ever smelled my exhaust is when I'm standing outside at the rear or if I'm backing up. Since I do neither very often, it isn't an issue with me.
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Patrick
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DEC 06, 08:54 PM
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| quote | Originally posted by Falstaff:
I cut the cat off mine a long time ago. Completely useless...
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"Completely useless"? Not if it was functional.
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fireboss
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DEC 07, 11:58 PM
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Cat delete----- ------- this gonna be fun
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Spadesluck
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DEC 08, 01:40 AM
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I have an 87 GT that I recently rebuilt from the ground up. When I did the exhaust I left the catalytic converter off. With the straight pipe and ocelot exhaust the car sounds great. I traveled over 4k miles and 9 different states last June in the car and I had no problems with noise. I would even go far as to say if you stood next to the car you would never know it did not have a cat on it. Now reasons I didn't put one back on better flow and I did not want to purchase something I did not want anyways. Win win for me I suppose. Others results may vary.
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Habanera Hal
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DEC 08, 09:00 AM
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A properly functioning cat will not affect exhaust flow. While Dennis has a valid point regarding the dangers of oil drips, a heat shield above the cat would address that issue (although better to maintain the car so there are no drips, anyway. Besides if there is a drip, it's either going to hit the cat or a hot exhaust pipe, so I don't see much difference either way.)
As a side note, over the years I've gotten used to breathing. I'd kinda miss that.
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Patrick
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DEC 08, 04:09 PM
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| quote | Originally posted by Habanera Hal:
As a side note, over the years I've gotten used to breathing. I'd kinda miss that.
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