Catless downpipes & no tune

[Mpire]

does it make sense to do Catless downpipes & no tune ?
will I have issues other than CEL having catless downpipes without a tune?

[sales@vivid]

Originally Posted by Mpire

does it make sense to do Catless downpipes & no tune ?
will I have issues other than CEL having catless downpipes without a tune?

I would say about 90% of my clients that do catless downpipes also go with a tune. The CEL removal is an obvious reason to do it, but combining the power gains from doing downpipes with the additional power from the tune, is a huge difference in how the car drives. Let me know if I can be of any assistance when you go to order anything.

-Ralph

[BPMSport]

Originally Posted by Mpire

does it make sense to do Catless downpipes & no tune ?
will I have issues other than CEL having catless downpipes without a tune?

You won't know if there is another issue causing a CEL because it will already be on. This is a major downside. Much better paired with a tune but you won't hurt anything as is.

[lunden]

Originally Posted by Mike Benvo

You won't know if there is another issue causing a CEL because it will already be on. This is a major downside. Much better paired with a tune but you won't hurt anything as is.

lol, it will not throw DTMAL. The CEL will only light up after some miles. Also the CEL has a few functions but not many, if it blinks car has misfired. If it is on with DTMAL it can be boost issues. But if only CEL lights up it is ONLY cat efficiency codes

[BPMSport]

Originally Posted by lunden

lol, it will not throw DTMAL. The CEL will only light up after some miles. Also the CEL has a few functions but not many, if it blinks car has misfired. If it is on with DTMAL it can be boost issues. But if only CEL lights up it is ONLY cat efficiency codes

Did I say it would throw a drivetrain malfunction? No. Obviously if you have a drivetrain malfunction you would know something else is wrong other than the cat efficiency error.

Only more serious faults will trigger that and limp mode, including misfires.

The CEL will not blink on every misfire, it has to see a certain amount of misfires within a particular time frame (actually within a predefined number of ignition events/RPMs)

There are MANY faults that will illuminate a CEL without any drivetrain malfunction error.

You need to go back and do your homework.

The point I was making is simple, if you already have the CEL on for cat efficiency faults, then if another fault surfaces that would not cause a drivetrain malfunction, you would have no way of knowing without reading the faults.

[lunden]

Originally Posted by Mike Benvo

Did I say it would throw a drivetrain malfunction? No.

Only more serious faults will throw that fault, including misfires.

There are MANY faults that will illuminate a CEL without any drivetrain malfunction error.

You need to go back and do your homework.

In the s63tu, I have ONLY experienced what I wrote. Misfires will blink and throw DTMAL too...

[BPMSport]

Originally Posted by lunden

In the s63tu, I have ONLY experienced what I wrote. Misfires will blink and throw DTMAL too...

Yes if you sit there with your foot in it while it's misfiring like crazy, it will blink and you'll get a drivetrain malfunction. You're referring to something completely different than what is being discussed above.

[lunden]

Originally Posted by Mike Benvo

Yes if you sit there with your foot in it while it's misfiring like crazy, it will blink and you'll get a drivetrain malfunction. You're referring to something completely different than what is being discussed above.

It will blink even after misfire has occured.. Let me send over a shit file and you will see lol. Let's end this. Downpipes + tune is what this guy needs, no damn CEL no nothing.

[BPMSport]

Originally Posted by lunden

It will blink even after misfire has occured.. Let me send over a shit file and you will see lol. Let's end this. Downpipes + tune is what this guy needs, no damn CEL no nothing.

It will only blink if X amount of misfires happens in Y amounts of crankshaft rotations. It's programmed into the software. Also, mainly potentially catalyst damaging misfires will cause the blink. There are misfires that can be stored, and then there are the more serious misfires with emissions deterioration.

If you have a "shit" file as you say that is fueling wrong or changing knock control or ignition parameters to aggressively, then may reach X misfires faster and then blink.

We can agree to disagree

[MCarsFan]

Get a tune loaded and all your issues will go away.
1. Remove cold start - not required when you don't have cats. Neighbors will be nice again.
2. Remove CEL- you will be able to visit your dealership more frequently and they won't tell you there's nothing they can do because you have downpipes, so you will be able to get your car looked after more effectively.
3. You won't feel like you're making a hang of a lot of noise and not getting the full benefit of the downpipes

[TheHouseWon]

Getting a tune can probably solve world hunger

[BPMSport]

Also if you get a tune that's OBD flashable make sure your tuner knows how to mask the tamper detection faults so the dealer is never alerted in service.

[TheHouseWon]

Speaking of obd, can a tuner lock out other tuners by setting passwords or encryption? As in you get a tune by Xyz and then you want it re-tuned by Abc tuner via obd.

[Eddybro]

Originally Posted by Mike Benvo

Also if you get a tune that's OBD flashable make sure your tuner knows how to mask the tamper detection faults so the dealer is never alerted in service.

Tell me more ...

[MCarsFan]

Originally Posted by TheHouseWon

Getting a tune can probably solve world hunger

Ha ha!!

[mike@x-ph.com]

Originally Posted by Mpire

does it make sense to do Catless downpipes & no tune ?
will I have issues other than CEL having catless downpipes without a tune?

No tune you will get a CEL, you can ignore it. No harm will be done to the car

Catless DP will give you a better sound, a slight power increase and better turbo spool

Adding a tune to the mix will help you take full advantage of the DP to get max power increase

So to answer your question, if you are after sound only yes it makes sense.
If you want power, no get the tune

[BPMSport]

Originally Posted by Eddybro

Tell me more ...

Basically when the DME is programmed to accept OBD flashing, it knows this and throws faults for tampering that the dealer can see. We stop the ECU from throwing these codes so there are no red flags raised during service visits, etc..

[NightM]

If yo

[TheHouseWon]

Originally Posted by Mike Benvo

Basically when the DME is programmed to accept OBD flashing, it knows this and throws faults for tampering that the dealer can see. We stop the ECU from throwing these codes so there are no red flags raised during service visits, etc..

Originally Posted by TheHouseWon

Speaking of obd, can a tuner lock out other tuners by setting passwords or encryption? As in you get a tune by Xyz and then you want it re-tuned by Abc tuner via obd.

?

[mike@x-ph.com]

Originally Posted by F10M5Manual

If you get just catless dp. U cel light on if you are ok with that. Then go for it


If you are bothered by cel being on. Flash tune is way to delete cel light

Or JB4

[BPMSport]

Originally Posted by TheHouseWon

?

You'd have to lock out OBD programming completely which would be a very foolish thing to do, but it is possible.

[NightM]

Originally Posted by mike@x-ph.com

Or JB4

Jb4 deletes codes now?