I have, it dose make it a little louder and the pops and bangs sound better. I never had the need to re-map the car or anything. I went no resonated big stock imitating
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Got an RPM Performance one and it doesn’t throw any lights up, there’s a hole to trick the sensor. Doesn’t require a map. Certainly improves the noise a little
Anyone that's got a GPF delete (RPM performance or similar), how loud would you say it is even with the valves open/ closed/ cold start etc? Very tempted to buy one but want to keep a good relationship with my neighbours lol!
I have RPM flexi pipe and GPF delete installed. I think it`s ok at valves closed/easy driving. Valves open you get attention.Anyone that's got a GPF delete (RPM performance or similar), how loud would you say it is even with the valves open/ closed/ cold start etc? Very tempted to buy one but want to keep a good relationship with my neighbours lol!
Cold start bit louder, especially when the idle drops normal. Resonated is a bit quieter than straight through.
I got the GPF Delete. It's much louder with the valve open and close to stock in Normal mode. Cold start is louder of course, though nothing crazy. If you're worried about cold start noise, get the resonated version and add a Flexi later if you want a bit more soundAnyone that's got a GPF delete (RPM performance or similar), how loud would you say it is even with the valves open/ closed/ cold start etc? Very tempted to buy one but want to keep a good relationship with my neighbours lol!
I got the GPF Delete. It's much louder with the valve open and close to stock in Normal mode. Cold start is louder of course, though nothing crazy. If you're worried about cold start noise, get the resonated version and add a Flexi later if you want a bit more sound
I don't wanna sound stupid but what do you mean resonated version? Do RPM sell both of these? I don't particularly want to go for the flexi (replaces CATs no?), hence looking at just GPF deletes
Yes, they sell 3 versions:
- Non resonated (loudest)
- Resonated (not as loud)
- Stealth (kinda looks like factory part)
The CAT is in the downpipe, not the flexi pipe. The flexi is between the downpipe and GPF. It’s the most restrictive part of the exhaust, hence the improvement in the throttle response when you change it to a wider version like the one RPM sell.
The removal of this emission hardware component will undoubtedly reduce exhaust back pressure. However, it will disrupt the stock three-dimensional map for fuel delivery. Operating with an excessively lean fuel mixture can lead to piston meltdown or exhaust valve temperatures exceeding safe limits.
Adjustments to the fuel delivery map, turbo boost map, ignition timing, and other parameters will be necessary to prevent exhaust enrichment at high RPM.
These are just a few of the modifications that would be required. However, these parameters should be adjusted at a minimum.
Adjustments to the fuel delivery map, turbo boost map, ignition timing, and other parameters will be necessary to prevent exhaust enrichment at high RPM.
These are just a few of the modifications that would be required. However, these parameters should be adjusted at a minimum.
A lot of people, myself included, have been running with the GPF delete for tens of thousands of miles. The car runs just fine. It’s not that big of a difference in flow to require a remap. Not like a new downpipe does. As long as the catalytic converter is still there, no need for a remap.
The ECU can account for such small changes and adapt. That’s why it always runs a bit different the first few days after you switch out the GPF (I do it once a year for inspections). After about a week, the ECU adjusts to the new reality by itself.
If you have the ability to watch live data on the air/fuel ratio, exhaust temperature, and turbo vane adjustments, you will see what is happening. Even with the catalytic converter in place, there is a difference in exhaust back pressure that the stock ECM will have a hard time compensating for.
If going to this extreme. Full custom ECM remapping should be done to prevent engine damage.
If going to this extreme. Full custom ECM remapping should be done to prevent engine damage.
Modern ECUs are not adapting engine values until infinity, there are limits in place until which the ECU will adapt.
Apart from a different sound experience, a GPF-Delete will only impact the engine's performance/power output to a certain (marginal) degree - especially with the oem catalytic converter still in place. The engine will not suffer damage from such a change, the ECU's programming is there to prevent that.
I will agree with you up to some point.
But if engine is constantly being run to hit calibration values to prevent damage. It will eventually with time cause problems or damage.
I do work for N division and engine calibration and engine testing are part of my job.
And we are actually on same page regarding custom modifications and how they affect engine air to fuel ratio, cylinder combustion pressure and other things that are important for engine life.
agreed, but I know that at least for the i30N models the ECU does not run into limits regarding adaptation, just by removing the GPF. There are more mods needed, e.g. changing the catalytic converter to a more high-flow one.