D5 euro 3 with after market DPF. Delete EGR or not?
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Hi there,
I've been researching the pros and cons of deleting the EGR system, particularly in relation to the Volvo D5 Euro 3 engines that have been retrofitted with aftermarket DPFs as mine is. One concern I keep coming across is the impact on soot and unburned diesel particles. From what I understand, the EGR system allows for a sort of “second burn” by recirculating some exhaust gases, which helps reduce the amount of raw soot entering the exhaust system.
If the EGR is deleted, wouldn’t this mean that all that carbon and unburned fuel now bypasses the intake and goes straight through the turbo and into the DPF? In the long run, wouldn't that increase the risk of clogging the turbo vanes and causing premature DPF failure, especially with aftermarket DPFs that may not regenerate as efficiently as OEM systems?
I'm also wondering if this leads to higher backpressure, increased exhaust temps, and possibly reduced turbo lifespan. While I know that deleting the EGR can reduce intake fouling and avoid issues like EGR cooler leaks, does it really make sense to do so on a system that still has a functioning DPF — especially a non-OEM one?
In your experience, is an EGR delete a viable option in these cases, or does it simply shift the problem downstream? Would a proper ECU remap and optimized fueling be enough to offset the increased soot load, or is this more of a risk than it's worth on a daily-driven D5 with an aftermarket DPF?
Appreciate any insight you can share!
