10-04-2012, 01:45 PM
SRowell Wrote:Toms306 Wrote:Are there any particular uprated panel filter makes you'd recommend Dave?
K&N surely? Or green.... Green something or other?
None of them.
I think Pete (TB205) might have the link, but someone over in mainland Europe tested a bunch of filters years back on a 206 HDi with ~ 150bhp.
They tested OEM, uprated paper, cones, panel K&N's, yadda yadda.
They all made within about 2bhp of each other on a dyno (149-151bhp). They even tried it without a filter housing at all (MAF direct to air), and it still made about 150bhp
Given the fact it was on a dyno also means you won't have seen the benefits of the standard airbox on reducing heat soaking, and also won't have seen the benefit of the standard airbox on ram air intake effect.
The standard HDi90 intake system on the 306 is amazing basically
Spend money on the exhaust is my only bit of advice really. Anything there is an improvement (for performance and sound which is what we are looking for anyway)
As for exhaust mods, the standard centre section is very good.
If I were doing a HDi tune again I'd simply source a spare centre section, remove the OEM back box, replace it with my spare centre section, and then weld the OEM tip back on the back (chrome oval jobby) Then the usual de-cat.
That is what I ran on my 306 HDi with stg1 and stg2 and it was great and very cheap... a good sound and good free-flow performance.
It was even better with the centre box removed and just a centre box at the rear, but it was quite loud... and totally intolerable once the FMIC went on haha... some people may like it that loud but I didn't
Ignore anyone selling any kit/component for the HDi intake side unless they have some fantastic proof to show it's actually worth while!
I might get around to it one day relatively soon. 3D printing in ABS is getting pretty advanced now so I'm sorely tempted to build something that fits onto the OEM mounts, but feeds straight off an enlarged intake trumpet and then directly into a larger filter housing. Then just a flexi-mount onto the MAF.
But even still I'd want to test it to make sure it actually worked. That is where mainstreams go wrong. They make it and in theory it might work, but in practice it might not work, but then they retail it to you anyway at huge cost haha
Dave