Smooth Bore Induction Hose ?

[daveb500]

I've got a small hole in the black pipe coming from the Plenum (looks like the dipstick has been rubbing on it at some point) and so I need to replace it. What are the benefits of the full "smooth bore" induction kits? I understand the logic behind it but does it make much difference on it's own or is it only really beneficial with other engine mods? Obviously I'm not expecting miracles.

Has anybody fitted one and noticed a difference?

[thegman]

I have one fitted. I have not noticed any difference except it looks better. Its meant to provide like 1 extra hp. Probably much less important than the wind direction....

[900T-R]

According to Joo as well as the owner of the place where we rolling road test all our road test cars, the 90 degree elbow from AMM to TB is the important one - IIRC Joo said it's an easy 5 hp (or so) to get.

[daveb500]

Ok. So infact, the pipe that I need to replace (the 90 deg. bend) is the bit that makes the most difference then. Question is, do I spend £30 to be practical or £120 to make it look nice....

[rev-erend]

Best put a bit of duct tape on it for now..

[900T-R]

daveb500 said:

Ok. So infact, the pipe that I need to replace (the 90 deg. bend) is the bit that makes the most difference then. Question is, do I spend £30 to be practical or £120 to make it look nice....

I spent not even that to make it practical and nice - a 135 degree silicone bend has longer legs than the 90 degree ones, so I took one and cut it off at 90 degrees (for some reason, this worked better with the 70 mm ID bend for the standard sized throttle than with the 76 mm one that replaced it, but then I had a mission getting it to fit on the AMM side as that's 80 mm... ).



Old 70 mm version which I still have in my basement storage - a cast-iron b**ch to put on at the AMM side, though.

[spend]

The resistance to deformation is just as important (probably more in fact) than the smoothness in the total induction. The smoothness seems particularly effective in the AFM-plenum, and the resistance to collapse in the filter-AFM IMHO

[900T-R]

So the above combo must be just about optimal, then.

[Uncle Fester]

Has anyone tried relocating the AFM?

What would happen if the AFM were rotated 90 degrees so the path of the air was a straight line from AFM to throttle body?

Then move the bend to before the AFM.

[rev-erend]

900T-R said:

daveb500 said:

Ok. So infact, the pipe that I need to replace (the 90 deg. bend) is the bit that makes the most difference then. Question is, do I spend £30 to be practical or £120 to make it look nice....

quote]

That must have been loud .. if you started it