lagging an exhaust

[eybic]

Helloooooo,

I plan to lag the exhaust on my GT-Four, I have a big roll of graphite wrap and some stainless tie wraps. Do I need any sealant for the wrap to stop it soaking up any water and steaming like Thomas the tank.? Any suggestions on making it an easy job? I thought of cutting it into more manageable lengths like maybe 4 metres.

Any suggestions welcomed.

[stevieturbo]

I'd ask why bother ?

[eybic]

I have heard it increases gas flow out of the exhaust due to keeping the heat in it longer, also I have an aftermarket turbo on the car which means the exhaust isn't in the standard position so vibrates sometimes on the front crossmember as it is such a tight space and no amount of shoving and "manipulating" will stop it so it would also help reduce this, I know it's not an ideal solution and will be getting a custom exhaust (Haywood & Scott) done at some point.

[456lbft]

The main gain from lagging, is reducing the underbonnet heat and thus increasing the charge density (amount of oxygen) in the incoming air. I have yet to see evidence of a measurable gain from increasing the exhaust gas temp. As for curing vibration, the lagging will wear through very quickly being much softer than the steel it is wrapped around.