Right, I'll try to explain further:
ECS is a US company that found out that a N75 valve off a non 1.8T engine would 'fool' the system into running more power by holding more boost.
It gave me 4.5BHP / 28 lb-ft of torque.
However...I have not had chance to fully test the EGTs, mixture etc to prove it's safe on a high output S3.
Also, it's fine when the weather is warm and the air density high...run the N75 in cold weather and you WILL hit limp mode...and without a VAG-Com to clear it, your up **** creek without a paddle.
Note also, that as boost increases, so does the inlet temperature as the crappy standard ICs cannot keep high boostcharge cool...I was getting up to 70 degrees inlet charge temperature on the standard ICs BRFORE fitting the N75...so there is no way I'd even think about running a different N75 on standard ICs with the boost levels I'm currentl running. You have been warned. Melted internals are not funny.
All in all...probably NOT a great mod for everyday use. In my opinion anyway.
So, back to the mods:
I'm stuch offshore at work at the mo, so I don't have all the graphs in front of me...but from memory the stages were as follows:
(All mods were dyno'd independantly by the same operator to the same standards...all at Star Performance, Glenrothes...by Jim)
Standard = 200BHP / 199 lb-ft
Added Milltek exhaust = 200 BHP / 203 lb-ft
Added Milltek Cats = 203 BHP / 207 lb-ft
APR low boost chip = 248 BHP / 260 lb-ft
- inlrt charge getting too high.
Added Forge FMIC = 254 BHP / 280 lb-ft
APR 1.4 bar high boost chip = 264 BHP / 288 lb-ft
APR 1.4 bar high boost optimax chip = 269 BHP / 300 lb-ft
Added modded airbox / K&N panel filter = APR 1.4 bar high boost optimax chip = 270 BHP / 305 lb-ft
Added ECS N75 = 275 BHP / 332 lb-ft
The figures may be off by as much as 5 either way, on both scales...but you get the idea.
These are not one off figures either...fully repeatable...I've even done testing to show the effects of heat soak (horrendous losses!!)
There are a few more stages to be added to in the next few months too...watch this space!!
As for the airbox...
I'm running a K&N panel filter and have smoothed out the box intrnals, and added a 4" cold air feed into the airbox...but the standard, sealed airbox remains.
I'm lucky that the 4" feed goes down the side of the airbox between the box and the inner wing, and down into the area normally reserved for the passenger side IC. This is an area of relatively high pressure (tested with a manometer!) and an area where there is plenty of cold, dense air.
I can post pics if people are interested.
Hope some of you find this interesting....