That's the thing. Some of the sound will be down exhaust. i.e how the exhaust note has been tuned when the exhaust was built and some will be down to engine configuration, induction and mapping.
Now I appreciate that the 500 has the 1.4 t jet and that it runs a similar but different turbo (it appears the USA ones run multi air with GT1446 same as the mito qv) , with a very similar downpipe configuration i.e CAT in the downpipe.
So, where am I going with this..
1. pops and bangs.. This isn't the exhaust (although a free flowing system with CAT's removed will amplify the sound) it's the mapping. The pops and bangs are fuel igniting after the exhaust valve has opened and in the exhaust manifold through the decel regions of the map. (Now when I say regions of map, I'm talking about traditional table ecu's, but the principle is same for torque demand based ecu's). So what is happening is that the engine is running lean through decal and the map is pulling ignition timing out (retarding the ignition timing). However you will still have some fuel vapours left around the injector nozzle, in the chamber and in the squish area. This gives a very lean and a very slow burning mixture, as a result the burn will still be happening when the exhaust valve opens which gives a very high, sudden pressure release into the exhaust. The pressure release gives the pop sound and the combustion reaching, and finishing, in the exhaust is the bang.
Also the noise on idle and load is a product of cam phase and overlap. A combination of static and dynamic ignition timing. The t-jet is twin cam ours is a multi-air the fact that the ecu on the multi air changes this on the fly means you probably ain't gonna get what you want.
So considering that the multiair unit is designed for economy foremost and the performance side comes from being able change the lift on the fly for given toque demand, you should some pops and bangs whatever exhaust you fit, but this is not a guarantee and you prob won't get exactly the same sound.
2. exhaust sound: some of that rasp you get on the 500 is down to the induction. We know the mito airbox isn't up to the job, it also a load of bends and corrugations in the pipe. This is to make it quite.. Change this as well.. superspirnt do a good one I'm looking at.
3. decat downpipe.. get the cat out and you will get some more noise. although the turbo does a good job of taking a lot of noise away.
tbh.. Just a wizard exhaust and downpipe on. It will sound great, prob not quite like a 500, but so what..
The Wizard exhaust isn't particularly loud on the Mito, and at low-medium throttle at mid revs such as motorway driving you get more noise from the frameless windows..Thanks Evo! Interesting stuff.
Just exploring the options, but nothing back from Pro Alfa yet.
The Wizard sounds good, just worried it's too loud and bleary for my liking, but that's only from listening to them on 147gta's.
I have a K&N induction kit on mine, so my QV has plenty of induction noise! Haha.
Sent from AutoGuide.com Free App