With soaring petrol prices affecting many motorists, the question often gets asked, 'will a performance exhaust help to improve fuel economy with my V8?' The answer is yes, and here are some interesting reasons why.
The automakers typically have designed exhaust systems on V8s with small diameter pipework and large tri-flow mufflers in order to reduce the noise to a level that ensures most wouldn't even recognise that the vehicle is running a powerful V8 engine. Now this design intent serves its purchase for those that are just looking to enjoy their ride without the community knowing that they're in possession of a powerful V8!
However on the other hand it doesn't offer the satisfaction that many V8 vehicle owners want, and that's hearing the beautiful deep V8 rumble. This is why so many people decide to do an exhaust upgrade with a design of exhaust that has larger diameter pipework and less restrictive mufflers.
So along with the improved sound that a performance exhaust upgrade will provide, the design of the mufflers is also crucial to reducing the gas flow restriction and enabling the engine to breathe better, resulting in less fuel consumption.
The below image shows a typical muffler design in an exhaust system manufactured by the Toyota factory; it shows the restriction and turbulence the exhaust gas experiences in flowing from the inlet to the outlet. Toyota does this to reduce the noise level, but it chokes up the engine and doesn't allow it to flow freely.
The below image shows a typical performance muffler design used by Rhino Exhaust. The exhaust gas flows through the perforated tube effortlessly with minimal flow deflection, which naturally means less restriction.
And we all know that towing a trailer adds even more strain on the hardworking V8 of the 100 Series UZJ100 V8, which in turn leads to it guzzling even more fuel than when just humming around town. Again, a performance exhaust will help out here too, as the improved power afforded to the engine will take the pressure off always having to reach the top throttle to climb a hill, for example. One gentleman recently advised us that he was guzzling a whopping 28 litres per 100km of fuel when towing his caravan behind the 100 Series 4.7L V8! He installed the Cat Back Performance Exhaust by Rhino Exhaust and was most impressed with the gains!
For more advanced and the most notable gain in fuel efficiency on the 100 Series V8 Landcruiser is in the 100 Series Headers and High Flow Cats package.
The Rhino Exhaust Headers and High Flow Cats provide much-improved exhaust flow when the exhaust is at its highest temperature straight from the engine. Starting with 4 tubes of mandrel bent piping that finally meets into a single collector and then 2.5" flange; the next assembly is the high-flow catalytic converters which are identical for both the left and right-hand side and are manufactured in 2.5" pipework.
One of the critical design features of the Rhino Exhaust design is that you can install these headers and cats to the 100 Series V8 and save significantly on fuel burn without having to do an ECU remap. This is because we have a special oxygen sensor flange to enable override on high-flow cats. The two-bolt flange sensor position is still per the OEM style but is done to ensure that the ECU doesn't pick up the increased exhaust flow running through the manifolds and catalytic converters. This doesn't pose any safety risk or risk to your vehicle.
So get your 100 Series V8 Cruiser firing on all 8 cylinders and start saving on your fuel bill with one of Rhino Exhaust's 100 Series V8 performance exhaust upgrades.