Lotus Emira Track Car (Not a show car)

[odman99]

I’d delete the rear diffuser. Makes a huge difference in hot air dissipation and trash collecting in it

 

[Rcktmn]

Damn. Car sounds crazy with headers

 

[Tomwa]

I’d delete the rear diffuser. Makes a huge difference in hot air dissipation and trash collecting in it

Guess it depends on how fast your given track is. Seems a waste to have a flat bottom car and then give up the actual flow directing part in the last yard to goal post.

At high speeds I am sure you'd feel a stability difference between it being there vs not. If anything for something track dedicated, I'd be look to re-construct the diffuser part into something that extends out a bit more, has slimmer fins, and be looking at mesh-ifyiing more of the rear bumper to get air out. All besides which, the muffler is not a particularly critical part of the equation that is generating heat.

The muffler lives inside its own cavity with a small pass through to the main engine compartment. "freeing" air below/around the muffler is not really going to encourage a more cool engine bay since, for all intents, they aren't connected.

From the Evora folks, who have been chasing engine bay temps for some time longer than we have. Most of the engine bay heat is being generated around the catalytic converters that are in the manifolds. Supposedly moving to GRP headers or the like drops engine bay temps dramatically, while adding Hp to boot.