The exit port on a K14 turbo (92 Eco) is about 2.25 in. diameter. I guess I don't see the advantage of going to a larger ID downstream of the port. I run 2.25 in. I.D. pipe.
i say if you are going to put a downpipe on it should be at least 2.5, you want to eliminate any possibility of back pressure[/i], i would love to go 3" with my k14 if it is possible! i just have the stock downpipe and it is a little small i think, even with 2.5 exhaust pipe.
this was originally posted by 935 racer in the vendors section under 3" downpipes ". The reason is that exhaust post turbine can expell quicker than it can exit the engine due to the small turbine, the downpipe can move more volume than what is capable of being pushed though the tiny turbine and the manifold pressure increases."
In my experience 2,5" is perfect up to 170hp. I could measure a little backpressure, not much but little. Dumped the exhaust, drove with only 3" downpipe and got 0,1 seconds off 1/4mile time with gtech Now I have all 3"
So what would be the recommended size of a DP/exhaust for a 1.6TD that's stock but has a K14 on it?From what you are saying you can't have too big of a downpipe regardless of turbo size?
No what I am saying is you can have too big of a downpipe if your turbo is too small, like a k14. If you have a larger turbo and especially if you have a really big turbo you can't have a downpipe too large.
Quote from: "MJF"In my experience 2,5" is perfect up to 170hp. I could measure a little backpressure, not much but little. Dumped the exhaust, drove with only 3" downpipe and got 0,1 seconds off 1/4mile time with gtech Now I have all 3"Do you have any pictures of your 1.7 IDI engine bay, and some dyno sheets or other details? I'd love to build a 1.7 myself.