Rev up Air Box

[Dicky]

Do you think the shape of the air box itself forms part of the improoved performance of this air box or is it just the steel tube (velocity stack)redesign. If it’s the latter it may be possible modify the older air box, what do you think?

[Jez @ H-Dev]

From what I've seen its just the metal bell mouth tube. Thats just from looking inside, not taken one apart to see if there are any other differences. I reckon it'd be possible to fit a bigger tube to the older boxes.

[Dicky]

Rang my local dealer to price the new air box and they quoted a ballpark of £350 and as there like rocking horse @*!# a mod seems the only option. Cant really see how it would improve performance, wouldnt have thought it was because of any venturi effect but dont know. Does anyone know?

[Jez @ H-Dev]

The early trumpets have a fairly tight radius, the later ones are longer with a more radiused intake which could help air flow.

[Neilp]

Rang my local dealer to price the new air box and they quoted a ballpark of £350 and as there like rocking horse @*!# a mod seems the only option. Cant really see how it would improve performance, wouldnt have thought it was because of any venturi effect but dont know. Does anyone know?

i will have one for sale in a week or 2, it has a little bit of plastic clip broken off but it serves no important purpose. It will be glued back on so its solid again.

[Dicky]

Rang my local dealer to price the new air box and they quoted a ballpark of £350 and as there like rocking horse @*!# a mod seems the only option. Cant really see how it would improve performance, wouldnt have thought it was because of any venturi effect but dont know. Does anyone know?

i will have one for sale in a week or 2, it has a little bit of plastic clip broken off but it serves no important purpose. It will be glued back on so its solid again.

 

PM'ed

[Mark@Abbey m/s]

To be 100% honest they do give a little better flow so will give a little more BHP/TORQUE but unless you can get one pretty cheap I wouldn't bother to be honest.

 

Just fir a free flowing panel filter and a remap makes a huge difference.

[rtbiscuit]

i'm in the process of creating new velocity stacks, i have an air box, so can do them on an exchange basis once i have the parts in.

[Mark@Abbey m/s]

Send me one then once you have it domne I can try it in my UK car.

[Dicky]

I’m fascinated how a tube that protrudes only 1" further into a plastic box with a radiused entry can have any affect at all. All I can think is somehow it produces a less of a turbulent flow allowing slightly more air to get to the engine. I’m tempted to make one out of plastic waste pipe (assuming same ID) Scary I know but nothing ventured no BHP gained

Interested to read Abby's post though but just thought if I go for the plenum spacer I may as well do this as well.

[rtbiscuit]

Send me one then once you have it domne I can try it in my UK car.

 

i'll see what i can do

[Aust350z]

I’m fascinated how a tube that protrudes only 1" further into a plastic box with a radiused entry can have any affect at all. All I can think is somehow it produces a less of a turbulent flow allowing slightly more air to get to the engine.

 

Correct. Read more here: http://en.wikipedia.org/wiki/Velocity_stack