Tuners have a thinking outside the box exhaust sound question

[Slow89]

Ok for the most part 95% wish our little EB sounded a bit better. So I had an idea and wanted to see if tuners could do this with DI engines. So SRT-4s are probably one of the best sounding turbo'd 4 bangers. It has a lot to do with the way the pcm is programmed on the car. The higher the stage PCM the louder the pops and crackles got. They all add a little fuel right before and during deceleration to give it that sound. - "Backfiring is the combustion of unburned fuel in the exhaust (or intake for that matter). So, the reason we get it during deceleration is because the flow is slowing down allowing any unburned fuel to heat up (autoignition temperature ~ 500 F). The reason Stage upgrades have more is because they allow more fuel to be delivered to the engine thus more fuel can get through unburned. Installing a 3" DP or turboback allows the flow to slow down even more during deceleration which give the fuel more time to heat up to that magic ~500 F." -


So I was wondering is it possible for any of our tuners to add this.... Maybe try it out and see how it sounds and responds to our little EBs.

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[K-Roll302]

The crackles, gurgles, and pops are the best part of a turbo 4's sound. The more the merrier, I say!!

 

[Slow89]

Hoping one of the tuners can hop in here

 

[Tucsonturbos]

Adding fuel on deceleration is not going to change the exhaust sound if that's what you are going for. As for the "pops", the less sound muffling pieces you have the more prominent it will be. Stock exhaust I had none but deleting that res and muffler I get a good amount almost every time I let off even on stock tune. If you have a cat, resonator and muffler than a tune designed to pop is going to need to dump a bunch of unnecessary fuel to sound "cool" kind of like the ghost cam from Lund. Sounds cool to some but zero gains either way that's something to ask your tuner.

 

[JGato]

Crazy part is that the SRT-4 did not even come with mufflers stock. I love that sound! I remember my buddy bought one when we got back from Iraq in 04. I always wanted to drive that car because it felt so damn fast! I had a slow ass 2004 civic SI that I dropped $5k into just to get hydro locked two weeks later.

 

[stang77]

Hoping one of the tuners can hop in here

I agree. These cars really don't have a great sounding exhaust at all. My Magna Flow setup helped mine some.

 

[ECM90]

Hold up! SRT 4 best turbo 4 banger sound?! I think this is up for debate.

I'd have to say a WRX/Sti with a nice exhaust takes the win on turbo 4 bangers engine sound. There's no tune or exhaust on any other car that can replicate that boxer engine note.

*Speakers with subwoofer required to appreciate true sound:

 

[i4gains]

actually, not to be a technical douche but it's not the boxer engine, but its actually the headers thats on the north american version on the STI's, in fact here in Oregon, Cobb has a store, Cobb surgline and he has the japanese version of the STI, which uses a different header, and it sounds like a ricer, nothing like the typical badass sounding subis

 

[Clarkson]

I remember that it seems like audi RS6/RS7 is programmed to spit a drop of oil to the exhaust when downshifting to provide a pop sound or anything. I wonder where do those oil come from tho

 

[Slow89]

Bump for a tuner to add to this

 

[Juben]

actually, not to be a technical douche but it's not the boxer engine, but its actually the headers thats on the north american version on the STI's, in fact here in Oregon, Cobb has a store, Cobb surgline and he has the japanese version of the STI, which uses a different header, and it sounds like a ricer, nothing like the typical badass sounding subis

That's the difference between unequal length headers (typical Subaru sound we all know) and equal length headers (standard sounding 4 cylinder sound).

Here's a video comparison of the two different header setups.

 

[Jdach]

I asked Adam about this a few months ago-
"Is there any way that you can make one of my tune slots pump in extra gas when I take my foot off the gas so it crackles? I know the jaguar f type and focus RS use software tuning to make it crackle and I was wondering if you could do something for my mustang ecoboost."


"There are no off throttle fueling tables unfortunately, so this wouldn't be possible."

 

[Slow89]

I asked Adam about this a few months ago-
"Is there any way that you can make one of my tune slots pump in extra gas when I take my foot off the gas so it crackles? I know the jaguar f type and focus RS use software tuning to make it crackle and I was wondering if you could do something for my mustang ecoboost."


"There are no off throttle fueling tables unfortunately, so this wouldn't be possible."

And there you have it.... Thanks for the answer :(

 

[ECM90]

That's the difference between unequal length headers (typical Subaru sound we all know) and equal length headers (standard sounding 4 cylinder sound).

Here's a video comparison of the two different header setups.

Equal length headers on a boxer still sounds different then a typical inline 4 cylinder.

The very nature of the boxer has the headers unequal length unless you do some weird bends to make them equal out, like shown in the video. So it's somewhat a byproduct of the engine design which is why I said it has that boxer "engine note". Also, the firing order is completey different as opposed to a inline 4. It goes 1324 as opposed to the inline 1342. All the Porsche 6 cylinder flat engines sound nothing like the V6s due to the firing order.

It's kind of like the difference in the GT350 with a different firing order using the flat plane crank which has more of a Ferrari V8 sound as opposed to the American v8 burble, its mainly attributed to the difference in firing order which is even for the GT350 just like in Ferrari V8s.

 

[Kbrewer]

I asked Adam about this a few months ago-
"Is there any way that you can make one of my tune slots pump in extra gas when I take my foot off the gas so it crackles? I know the jaguar f type and focus RS use software tuning to make it crackle and I was wondering if you could do something for my mustang ecoboost."


"There are no off throttle fueling tables unfortunately, so this wouldn't be possible."

I too asked Adam this question last week and got the same answer :(

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