Originally posted by Wee man
Hi i know im new to these ibizas but my mk2 8v's powerband is lower down the rev range and if i put a induction kit on, it may say what it says on the box, but the power would be in the wrong place as the bhp increase would happen outside the powerband and would actually sacrifice low end torque same goes for sports exhausts they enhance the car no-end by looks and by sound but you would probably never feel the benefits, you would only feel the loss of torque due to the decrease in backpressure which is caused by fatter pipes, biggerbackbox or straight throughs, a good way of demonstrating this is buy driving a modded car ie exhaust/induction kit and then driving a standard and then blastin side by side.
But then again i dont know **** apart from why take a perfectly fine plastic airbox with a cold feed pipe out of a car and dump in a round blob that sucks up anything under the bonnet ie hot air?
I know why not surround it by placing a metal case around it effectively sealing it from the engines warm air!!!
Mmm
so not only have you made replaced a light weight air box with a silly heavy alloy filter, but also the filters total surface area as well,
ITs all a bit funny aint it! lol
Somewhere deep down there are some real facts and figures though, so wade through the tuning minefield.
57i type kits, are good for induction noise, and generally have reduced air resistance and flow more air than stock paper filters. Bad aspect of them is drawing hot air from the engine bay. Nett effect may well be backwards.
Lightweight stock airbox and "silly" alloy filter housing? You clearly have'nt actually weighed anything at all. The alloy housing is certainly lighter on Hurricanes for example than the stock airbox.
A decent sized cold air feed pipe is essential also, routed to somewhere outside of the engine bay so cooler air can be drawn in. Stock airbox pipes, certainly on 20VT's are very small and quite restrictive. The good side of a stock airbox is it does at least breath through a cold air feed. (it is quieter than an induction kit also, which suits some but not others)
From kits I have tested and seen test results for, gains are pretty much everywhere, but most gain is top end, where there is more requirement for more airflow obviously. No losses though, on cold air fed kits.
Pleated cotton gauze filters are available in many sizes and shapes and surface areas vary hugely. They are also available in different layers 1,2,3 etc.... Surface area is only one part of the equation, surface restriction is equally as important and that is a feature of its construction. Paper filters can work very well too.
I guess someone should tell the likes of K&N or Green etc that they have it all wrong eh?
People should not kid themselves that adding any filter will dramatically improve their engines performance..... They would be over optomistic. Where you read claims, without dyno evidence of +10bhp from this and that product, you should be mindfull of its actual performance. 15bhp from a filter is staggering, but I saw this claimed once by PiperX for their Viper @ £250 too :eak:
regards
Bill
