Replace them or forget about it?

[Motorhead350]

My car has been running rich for a few months. When this happens the car spits up oil as we all know. I have high flow cats in the car and was wondering if they needed any attention after the dyno tune.

I know of a member on here that had his car running so rich for a while that he needed new cats, but they were stock to my knowledge. Since mine are high flow is there anything I need to worry about?

How is the set up different from stock to high flow?

[RR|Suki]

My car has been running rich for a few months. When this happens the car spits up oil as we all know. I have high flow cats in the car and was wondering if they needed any attention after the dyno tune.

I know of a member on here that had his car running so rich for a while that he needed new cats, but they were stock to my knowledge. Since mine are high flow is there anything I need to worry about?

How is the set up different from stock to high flow?

They'll prob die soon, my highflows lasted a few months running rich. One day on the big end of the track they decided they'd had enough.

[Zack]

Your car is far from ready for a dyno.

You replace parts BEFORE, not after.

[Motorhead350]

Your car is far from ready for a dyno.

You replace parts BEFORE, not after.

Should I replace the cats or are they okay?

Other than the "blow off valve thing" I don't recall what else there is left to do Zack.

I have:

1. Cleaned all tubing with carb cleaner and towel like you showed me.
2. Changed and gapped the spark plugs.
3. Changed the oil and filter
4. Constantly checked on where the oil was once coming from. After 100's of miles not a drop has come out.
5. Cleaned the MAF again
6. Changed the belt (Justbobs suggestion)

Left:

1. Cat converters?
2. 60 pound Fuel injectors (Bob will do it at his shop)
3. Repair blow off valve
4. Dyno tune

If I forgot something please tell me.

[justbob]

Generally it is good practice to change belts that are missing chunks. You will know from loss of power and stalling if the converters are good or not. Good time to install your cut outs, also they make it easy to check for clogged cats.

[Motorhead350]

The power feels just fine. I just didn't know if high flows could actually clog or not.

[Phrog_gunner]

My car has been running rich for a few months.



Left:

1. Cat converters?
2. 60 pound Fuel injectors (Bob will do it at his shop)
3. Repair blow off valve
4. Dyno tune

If I forgot something please tell me.

Your solution to your car running rich is bigger injectors?

[LeoVampire]

The power feels just fine. I just didn't know if high flows could actually clog or not.

The rodium and platnium inside of them change the unburnt fuel into a less harmfull gas. This process creates heat and the more unburnt fuel that gets into them the hotter they get until from the center of the honey combs to the outer start to melt down and close off the flow.

When this starts to happen the internal heat causes the outer skin to glow red with enough heat to cause rugs to ignite inside of the car, but not always depending on the internal design, until they start to break apart and rattle around inside of the shell and or get shot into the back half of the exhaust system which can cause more flow restriction problems.

Just depends on how rich the car is running as to how long this process takes.

[Motorhead350]

Your solution to your car running rich is bigger injectors?

No. The solution is a dyno tune. The reasoning is the car was tuned when I had a boost leak I was unaware of. The leak was fixed and the car went from 12.7 to 12.3 in the 1/4 mile. So since the car has more power now than it did on it's last dyno tune I know it needs it.

The cats was just something I thought of. They seem fine to me, but I just wanna be sure.

The reason for the bigger injectors is because right now I have 39 pound injectors. Those were meant for the car running 9psi. Now it's closer to 12 and needs to be upgraded due to the car running outta fuel in the top end, making it lean and cause potential engine damage.

[LeoVampire]

No. The solution is a dyno tune. The reasoning is the car was tuned when I had a boost leak I was unaware of. The leak was fixed and the car went from 12.7 to 12.3 in the 1/4 mile. So since the car has more power now than it did on it's last dyno tune I know it needs it.

The cats was just something I thought of. They seem fine to me, but I just wanna be sure.

The reason for the bigger injectors is because right now I have 39 pound injectors. Those were meant for the car running 9psi. Now it's closer to 12 and needs to be upgraded due to the car running outta fuel in the top end, making it lean and cause potential engine damage.

What is their duty cycle right now? Are they running above 90% then yes change them to something larger if not you are fine.

[Motorhead350]

What is their duty cycle right now? Are they running above 90% then yes change them to something larger if not you are fine.

I don't know how to make a reading.

Last time I made 456RWHP and was told I would need new injectors. Now I know I have greater than that so I would need them now for sure. I'm guessing my car should make around 480RWHP (according to Zack) and I just wanna be sure I don't blow it up or cause damage in the long run since I plan on keeping this car the rest of my life.

[FordNut]

My car has been running rich for a few months. When this happens the car spits up oil as we all know.

I don't follow this?

What does running rich have to do with spitting up oil?

Running rich and damaging cats, maybe. But over 90% of the time it's not running rich because it's in closed loop operation and constantly adjusting fuel injectors to give a 14.7:1 ratio, the only times it is running open loop is at WOT and when the engine isn't warmed up yet.

[FordNut]

The reason for the bigger injectors is because right now I have 39 pound injectors. Those were meant for the car running 9psi. Now it's closer to 12 and needs to be upgraded due to the car running outta fuel in the top end, making it lean and cause potential engine damage.

Is the car running out of fuel or do you just think it may be? You're right a dyno tune can tell you this.


What is their duty cycle right now? Are they running above 90% then yes change them to something larger if not you are fine.

If they're just about out of capacity, it is possible to change the fuel pressure to get a little more capacity out of the injectors, especially if the fuel system has adequate capacity. You can even make the fuel pressure jump dependent on RPM so the pressure stays just like it is (probably about 40 psi delta P) until the engine is in higher rpm range then it jumps to 60 psi.


I don't know how to make a reading.

Last time I made 456RWHP and was told I would need new injectors. Now I know I have greater than that so I would need them now for sure. I'm guessing my car should make around 480RWHP (according to Zack) and I just wanna be sure I don't blow it up or cause damage in the long run since I plan on keeping this car the rest of my life.

If you're making 480 rwhp on the stock engine it's just a matter of time. tick-tock-tick-tock BOOM (we need a couple more smilies, a clock and a bomb)

Been there, done that...