Renault – Front Exit Exhaust Details

Copyright Sutton Images via

Although we almost didn’t believe it when the rumours emerged at the launch of the Renault R31, The car does indeed have exhausts that exit at the front of the sidepods. We ( and I) managed to see, understand and get the first pictures of the unique set up ( Now the car can be seen stripped in the pit garage, we can see exactly how the Renault packages the exhaust.

The exhaust system routes the four pipes into a collector which then continues to point forwards and direct the secondary pipe low underneath the radiator to the front of the sidepods. As the exhaust routes gasses at up to 1000-degrees C, it needs insulating to protect the other equipment housed in the sidepods. Renault appear to have fitted an insulated jacket around the main length of pipe in the sidepods. What is clear from the set up is that Renault had to raise the radiators to allow the pipe to ass underneath. The R31 has unusually large sidepod inlets and this might to cope with the ducting of the cooling airflow to the laid down radiator.

Copyright: Andrew Robertson (@JarZ)

From these pictures via Andrew Robertson (@Jarz) we can see the front detail around the sidepods. Although the exhaust outlets are not seen here, the problem of the final routing is apparent. Teams need to fit beams to the side of the monocoque for side impact protection. Known as Side Impact Tubes (SITs) there are two pairs to share the load, with one upper pair and a lower pair. As these SITs are heavy, the majority of the work is down by the lower pair, to keep the weight low in the car. Correspondingly the lower SITs are larger and the exhaust needs to pass over these and down to exit sideways.

Copyright: Andrew Robertson (@JarZ)

Renault has packaged these lower SITs into a narrow front and wider rear Tube. The exhaust will angle down along the front tube to blow still pointing downwards across the lower leading edge of the floor. We can see the metallic heat protection on the SITs.

Copyright: Andrew Robertson (@JarZ)

More info on Front Exit Exhausts and how they work –

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7 thoughts on “Renault – Front Exit Exhaust Details

  1. Hey Craig in our country we express this type of feelings as “Fatafati”. which means awesome. really it is awesome 🙂

  2. Hey great article as usual 🙂 Great to see some really good out-of-the-box ideas.

    But dont you mean “pipe to pass” in the second para 3rd line from bottom….

  3. Hi Craig,

    Looking at the second picture on the right hand side in the middle; there are 2 white pieces of material; the larger one on the bottom with a piece of gaffer tape on it. These look to be connected by some form of actuator in blue. Any ideas what this is?

    I thought it might simply be a support that protects the leading edge of the splitter while the car is on its stands. I also thought that it might be there to measure the deflection of the splitter under load.


    Nick aka TargetP

    • Its a sensor, Specifically a LVDT (Linear variable differential transformer) it wil be used to measure movement in the front splitter. Toro Rosso had a similar in testing

  4. Pingback: Malaysian GP – Technical updates « Scarbsf1's Blog

  5. G’day Craig,
    Could you post a downforce 101 for us? How is downforce created? Is it deflection of the air off a wing or the pressures created by the air?

    Thanking you in anticipation,

    btw, if you have posted this before would you please provide a link.

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