Mazda 5 Exhaust Measurements

[DynoBunny]

When I was changing the oil I decided to snap some shots of the exhaust. I'm going to take some precise measurements of the lengths, angles, etc, next time I put it in the air, but for now I'm just trying to get a visual comparison of how similar it is to a Mazda 3 exhaust. For one the piping seems much smaller than the 2.5l 6 piping. I know the camera skewed the measurements I took, but I'd say that it's about 2in diameter piping, what I think is very small for a 2.5l.

It maintains the same diameter throughout.

This thing has to go :/

 

[dieseldriver]

I would love to do catback exhaust swap but that can be very expensive on these car from what I am finding out. Good info nevertheless.

When I was changing the oil I decided to snap some shots of the exhaust. I'm going to take some precise measurements of the lengths, angles, etc, next time I put it in the air, but for now I'm just trying to get a visual comparison of how similar it is to a Mazda 3 exhaust. For one the piping seems much smaller than the 2.5l 6 piping. I know the camera skewed the measurements I took, but I'd say that it's about 2in diameter piping, what I think is very small for a 2.5l.

It maintains the same diameter throughout.

This thing has to go :/

 

[MarkVII88]

In terms of your thought that the diameter of the exhaust piping maybe smaller than that of the 2012 Mazda 6 with the 2.5L engine, I don't know. But, the specs for the 2.5L in the Mazda 6 state 170hp @ 6K RPM and 167lb-ft at 4K RPM. That is 13 more hp and 4 more lb-ft and there has to be a reason for why the same engine makes less power and torque in a different car. Though, I can't imagine that Mazda or any other car manufacturer would opt to use different diameter piping for exhausts in different cars that use the same engine. That just doesn't make sense from an efficiency standpoint.

 

[Orangutan]

In terms of your thought that the diameter of the exhaust piping maybe smaller than that of the 2012 Mazda 6 with the 2.5L engine, I don't know. But, the specs for the 2.5L in the Mazda 6 state 170hp @ 6K RPM and 167lb-ft at 4K RPM. That is 13 more hp and 4 more lb-ft and there has to be a reason for why the same engine makes less power and torque in a different car. Though, I can't imagine that Mazda or any other car manufacturer would opt to use different diameter piping for exhausts in different cars that use the same engine. That just doesn't make sense from an efficiency standpoint.

I've actually been thinking about this quite a bit recently. Let's look at the MZR 2.5:
[table="width: 500, align: left"]
[tr]
[td]Mazda6[/td]
[td]Mazda3[/td]
[td]Mazda5[/td]
[td]Mazda CX-7i[/td]
[/tr]
[tr]
[td]170hp[/td]
[td]167hp[/td]
[td]157hp[/td]
[td]161hp[/td]
[/tr]
[tr]
[td]6,000rpm[/td]
[td]6,000rpm[/td]
[td]6,000rpm[/td]
[td]6,000rpm[/td]
[/tr]
[tr]
[td]167lbs[/td]
[td]168lbs[/td]
[td]163lbs[/td]
[td]161lbs[/td]
[/tr]
[tr]
[td]4,000rpm[/td]
[td]4,000rpm[/td]
[td]4,000rpm[/td]
[td]3,500rpm[/td]
[/tr]
[/table]



To me, this suggests that the engine is in a different state of tune in the CX-7 while the engine in the other three applications is essentially the same. They gave the CX-7i a bigger boost to torque in the lower range because it's a crossover suv and that's what people expect. In the Mazda3/5/6, though, it looks like it's the same horsepower and torque tune that is breathing differently in each application. I'd love to be able to dyno each one to see what the case actually is.