flusted...did you get your car tuned up?cause if you change the intake mani,it will need a tune up... man,every single mani is in blue letters!its the vw colors!
so to recap; here's how we've concluded that an external id can be made of your 16v inlet manifold: oldest models - 41mm. has round bit cast into no1 middling age(!) - 50mm. has narrowing bit past plugs youngest models - 42.5 does have round bit or narrowing did we decide anything about bets application of each? why did they revert to smaller ones? ..didnt expect it to be such a popular thread
My small early manifold from an '87 doesn't have that round casting 'knob' on no.1 runner, thought that was just the corrado ones?
My mk2 is from Switzerland so maybe it is different as they have stricter emission laws. But there again it doesn`t have a cat.
Didnt get it tuned but MY GOD Wot a difference.I have now been converted and will stand up for the 42mm item as my car pulls harder from 4k now instead of having to wait till 5k. I would say that due to the corrados weight,gear ratios and the fact i have 17s,42.5mm is best suited for this set up. I bet not many ppl changle from smaal to big back to small again to see the difference???
?? 42 has the bigger plenam size best suited to the 2.0 in stock ish tune, the 50mm seems to work well on the 1.8 as my 158bhp seems to prove on a stock engine
i would like to know why the 42 on the 2.0l! i really would!cause if you have a bigger engine,that will need more air,why restrict it!? but i changed from 42 to 50 in my KR,and man,what a diference after 4000RPM!!damn,it pulls
it's not just the diameter of the pipes that makes the difference, the boxy bit where the pipes meet, needs to be a certain size, and it turns out the 42mm one has the right size for a 2.0 engine at the rev ranges most people use, if you are revving to 10k revs then things might be different
If the 50mm has a constriction where the plug go in then surely it is all incidental. A pipe is only as wide as its narrowest point
It's more complicated than that - you have pulse tuning etc. to think about.......... plus the fact that you have frictional losses all the way along a pipe, not just at it's narrowest point.....
A bigger inlet is definately more suited for a 16 valve engine. If you want really low down torque buy a Diesel !! There is very little difference in lbs of pull on a 2 litre valver with either 42 or 50mm inlets between 2-3k as my plots will show. You love a 16 valve for what it does....rev and the essence of tuning a 16V is to get more power in a linear fashion across the range but especially at the top where it becomes a delight on road and moreso on track. The 50mm is far better suited for top end punch when everything else comes into play ie head and cams. Where others die at 6K the 50mm will help maintain power all the way past 7K.......lovely just what a 16v is all about. Ian
If that's to me, it just made me smile the way you put it. I wouldn't disagree, it was just the way you said it
