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Polo GTI+ Overrun?
Posted: Sat Apr 27, 2024 6:09 pm
by JS92
Hi folks,
This week I got a 2019 Polo GTI+ to replace my stolen Seat Leon Cupra 290 (MY2019) which I absolutely loved (would recommend if you ever think of selling your Polo) and one thing (among many) that I really liked about the Cupra was the overrun/pops when downshifting in Cupra mode, it wasn't OTT since it had a GPF and it just sounded nice - this is something I am missing in the Polo GTI.
So, since both cars are GPF/OPF and 2.0L engines, and pardon my ignorance, why can't the Polo produce this overrun? Is this something I would need to get via hardware or software mods?
Thanks
Re: Polo GTI+ Overrun?
Posted: Sun Apr 28, 2024 2:00 am
by redgti
Isn't it just faked somehow?
I doubt any modern engine is going to inject unburnt fuel into the exhaust to be burnt later for fun.
You will own nothing and be happy etc...
Re: Polo GTI+ Overrun?
Posted: Sun Apr 28, 2024 11:32 am
by JS92
redgti wrote: Sun Apr 28, 2024 2:00 am
Isn't it just faked somehow?
I doubt any modern engine is going to inject unburnt fuel into the exhaust to be burnt later for fun.
You will own nothing and be happy etc...
I don't quite see how it would be faked?
https://www.youtube.com/watch?v=Vw4mU1FJolI - Watch to 0:20 seconds you will clearly hear real pops on the downshift
And this is in Cupra mode, so injecting unburnt fuel will be mapped into that mode - it doesn't happen in Normal mode.
Re: Polo GTI+ Overrun?
Posted: Sun May 05, 2024 2:34 pm
by redgti
Interesting if the factory map does this! It does sound cool.
Re: Polo GTI+ Overrun?
Posted: Thu May 09, 2024 6:28 pm
by mobbeduo
Hey,
Congrats on the Polo GTI! If you're missing the pops and burbles you loved in the Cupra, your Polo actually has that feature, but it's just more subtle. By factory default, it includes a mild overrun burble, created by slightly retarding the ignition timing during overrun. You’ll notice it more if you drop the rear seats, which lets the sound come through clearer.
Both your Cupra and the Polo have GPF/OPF and similar engine setups, but they are tuned differently. The Polo is quieter straight from the factory. However, you can change this feature with an ECU remap, which adjusts the engine's fuel cut-off and ignition timing settings to enhance the overrun effects.
If you want to know more about how this sound is created, this video is a very good explainer.
https://youtu.be/Ya8p4grHV3U?si=6W-c4U6vywo0Jlf0
Re: Polo GTI+ Overrun?
Posted: Sat Jun 01, 2024 9:41 pm
by JS92
mobbeduo wrote: Thu May 09, 2024 6:28 pm
Hey,
Congrats on the Polo GTI! If you're missing the pops and burbles you loved in the Cupra, your Polo actually has that feature, but it's just more subtle. By factory default, it includes a mild overrun burble, created by slightly retarding the ignition timing during overrun. You’ll notice it more if you drop the rear seats, which lets the sound come through clearer.
Both your Cupra and the Polo have GPF/OPF and similar engine setups, but they are tuned differently. The Polo is quieter straight from the factory. However, you can change this feature with an ECU remap, which adjusts the engine's fuel cut-off and ignition timing settings to enhance the overrun effects.
If you want to know more about how this sound is created, this video is a very good explainer.
https://youtu.be/Ya8p4grHV3U?si=6W-c4U6vywo0Jlf0
Hey thanks for the reply - I've been mulling it over for the past couple of weeks and I think I'm leaning towards getting a Scirocco R, 440i or even another Cupra. The Polo GTI just isn't cutting it for me; cheap noisy/rattle interior, annoying DSG and (no fault of its own) slower.
Tuning the ECU to produce a louder overrun is something I may look into but tbh, I like my cars stock.