The EFI cars run leaner, changing the mix of gases and thereby the smell. It was one of the first things I noticed when I went from carb to TBI on the engine in the Mustang II.So why do carbed cars from the 60's and earlier smell differently than modern cars with cats removed.
Tell me i'm not the only one that notices this??
But the cherry smells more better.If your getting to old to deal with a little exhaust fumes from time to time try some fuel fragrance in grape flavor
I've been driving a Mustang without cats for 23 years now, and to be honest with you, I'm getting sick of the smell too. It's messed up, because my car no longer requires emissions testing. I'm considering a way to put cats back on the car without killing the power. EFI cars without cats do stink bad.I actually can't stand to be behind any car without cats, save for those old 60's hot rods. I don't mind, and even like the smell of those. They seem very mild.
Modern EFI cars for some reason really bother me. I know everyone says it's in the tuning, but I find it hard to believe every single efi car without cats is tuned that badly. I have fond memories of being in friends Mustangs back in the 90's in drivethru with people behind us swearing at us due to the fumes. Even today, most often when I get behind a modded car with no cats (even Mustangs) I find myself changing lanes to get away from the smell. I've been behind a few Cat-delete S550's and it just smelled BAD.
Modern 3-way catalysts aren't very restrictive at all. Look at all of the 450hp+ production cars running two or more per bank now.I've been driving a Mustang without cats for 23 years now, and to be honest with you, I'm getting sick of the smell too. It's messed up, because my car no longer requires emissions testing. I'm considering a way to put cats back on the car without killing the power. EFI cars without cats do stink bad.
Kurt
13hp and 14tq is less than can be gained with a handheld tuner while retaining the cats. There's no real reason to delete cats on a modern car. Some of them are so well engineered that you'll lose power from doing it.In searching the web this guy did a dyno before and after deleting cats on his 2018GT
EDIT: won't let me link direct to thread
454HP/420TQ with cats and 467HP/434TQ with them deleted. +13HP, +14TQ. Roughly a 3% gain in power.
I'm going to figure something out if and when I ever switch to a turbocharged setup. I don't think I want to run cats with the nitrous setup.Modern 3-way catalysts aren't very restrictive at all. Look at all of the 450hp+ production cars running two or more per bank now.
A catalytic converter is actually in my plans for the 4.6 turbo build for my II.
All this talk of cats and off-road pipes got me wondering what it must have been like to walk down a busy street in a crowded city in 1970 with all the leaded gas and lack of catalytic converters.
Lots of pictures of the smog, but I’m wondering about what the assault on the senses must have been like at ground level.plenty of pics of the ole smog days
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