I don't always tune n/a cars, but when i do, i make sure they belch black smoke
10-01-2013, 08:36 PM
#65
OEMs historically ran pig rich at full load to keep EGTs in check, primarily to ensure the cat would still be functional at the end of the 150k-mile emissions durability period.
The cooler EGTs also make things easier on exh valves, valve seats, turbine wheels/housings etc. This also allowed OEMs to be, er, more cost-conscious in their material selections while still meeting durability targets.
Nowadays the focus on fuel economy has made this fueling strategy undesirable in the OEM world.
The cooler EGTs also make things easier on exh valves, valve seats, turbine wheels/housings etc. This also allowed OEMs to be, er, more cost-conscious in their material selections while still meeting durability targets.
Nowadays the focus on fuel economy has made this fueling strategy undesirable in the OEM world.
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10-02-2013, 09:55 AM
#66
2 Props,3 Dildos,& 1 Cat
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so what do they do instead? advance timing a boatload so the combustion happens in the cylinder instead of the manifold? there's only so far you can go before timing + AFR = detonation.
I mean you can push it further with DI and stratified charge... but that's like 90's honda tech.
I mean you can push it further with DI and stratified charge... but that's like 90's honda tech.
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10-02-2013, 10:01 AM
#67
so what do they do instead? advance timing a boatload so the combustion happens in the cylinder instead of the manifold? there's only so far you can go before timing + AFR = detonation.
I mean you can push it further with DI and stratified charge... but that's like 90's honda tech.
I mean you can push it further with DI and stratified charge... but that's like 90's honda tech.
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10-02-2013, 11:11 AM
#70
so what do they do instead? advance timing a boatload so the combustion happens in the cylinder instead of the manifold? there's only so far you can go before timing + AFR = detonation.
I mean you can push it further with DI and stratified charge... but that's like 90's honda tech.
I mean you can push it further with DI and stratified charge... but that's like 90's honda tech.
Of course, there's a temp drop across the turbine, so the cat sees somewhat less. Still screaming hot though.
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10-04-2013, 09:33 PM
#73
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Join Date: Nov 2010
Location: Pittsburgh PA
Posts: 1,163
Total Cats: 12
huh?
No, he is on point: all oem cars are tuned to run relatively rich on startup to heat up the cats faster. Many newer cars even have a "smog pump" which is basically an air pump that blows into the exhaust stream or heads resulting in more crap flowing through the cats on a cold start and heating them up faster.
No, he is on point: all oem cars are tuned to run relatively rich on startup to heat up the cats faster. Many newer cars even have a "smog pump" which is basically an air pump that blows into the exhaust stream or heads resulting in more crap flowing through the cats on a cold start and heating them up faster.
Running rich is more about proper atomization of fuel with a cold engine/fuel supply, than heating up the cat. If rich AFRs did heat up the cat significantly better, OE manifolds wouldn't be cast with cats in them. Remember, a cat is a fine honeycomb, so the turbulence/restriction of the shape alone does most of the heating.
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10-04-2013, 11:06 PM
#74
Rich? My Trionic 7 Saab retards the timing until the cat is up to temp. Later combustion = more heat leaving the cylinders. Far more effective at toasting your cat in the morning. In the free tuning software suite, there's even a checkbox to disable the cat light-off timing retard.
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12-12-2013, 01:23 PM
#75
Senior Member
Join Date: Feb 2009
Location: DF-DUB
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Cant believe I missed this thread, I love following this guy.
You guys always ask why someone would read m.net, I'll tell you why, this guy is hilarious and I regularly check to see if hes posted anything new. I wish he posted more.
We had this same thing happen on a forum I used to moderate. People who understand tuning will know this guy is full of ****, people who bought his tune will say its the best. He will blow up a few engines, owners will say it wasnt the tune. Eventually he will learn something from the people telling him hes wrong, or major shenanigans will happen and he'll go away.
You guys always ask why someone would read m.net, I'll tell you why, this guy is hilarious and I regularly check to see if hes posted anything new. I wish he posted more.
We had this same thing happen on a forum I used to moderate. People who understand tuning will know this guy is full of ****, people who bought his tune will say its the best. He will blow up a few engines, owners will say it wasnt the tune. Eventually he will learn something from the people telling him hes wrong, or major shenanigans will happen and he'll go away.
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12-12-2013, 02:06 PM
#76
HAHAHAHAHAHAHAHAHA
Originally Posted by Tuning Done Rong
before anyone ask.
I did not post the AFR's so that we won't have to endure a "physics/business and advertising" lesson, and seeing that we are making 2 times as much power as anyone else... we are going to label the AFR's a trade secret.
So we will stick to providing results.
AFR's are not richer than a stock MX5 runs, is a non issue.
I did not post the AFR's so that we won't have to endure a "physics/business and advertising" lesson, and seeing that we are making 2 times as much power as anyone else... we are going to label the AFR's a trade secret.
So we will stick to providing results.
AFR's are not richer than a stock MX5 runs, is a non issue.
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12-16-2013, 03:30 PM
#79
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Join Date: Jul 2009
Location: Mesa, Az
Posts: 27
Total Cats: 3
Psssshhhh.
You newbs.
Everyone knows the worse mileage you get, you must be making more power. That is why the LEDs are "green" for GOOOOOOOOOOOOOOOOO! on the rich side of the wideband!
So, logically -
More Rich = More Power = More Rich "Tuner"
I made a pictorial diagram of how to tune a car :
You newbs.
Everyone knows the worse mileage you get, you must be making more power. That is why the LEDs are "green" for GOOOOOOOOOOOOOOOOO! on the rich side of the wideband!
So, logically -
More Rich = More Power = More Rich "Tuner"
I made a pictorial diagram of how to tune a car :
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12-16-2013, 03:39 PM
#80
I think the biggest reason this guy gets away with all his stupidity is because the ecutec maps and logs are not something you can easily pull from your ecu and upload to the interwebz for people to look at and discuss.
If and when this becomes the case, he's gonna need to figure out what he's doing REAL quick or people are gonna know better than to go to him.
If and when this becomes the case, he's gonna need to figure out what he's doing REAL quick or people are gonna know better than to go to him.
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