Stock D series Intake manifolds D15Z6 vs D16Y8 vs D16Z6

[EmZvr]

I was trying to find out before, which is the best stock intake manifold but there are conflicting views in the internet. And now thanks to google translate I found someone who has tried all of those intakes and send him a PM. So here it is:

Hi,

Yes, I've testet all three of them.

It is said that intake from D16y8 is the best for D-series engines.

In my car that was not thruth.

At first I've tested the D15z6 because it's the same as D16y8 (which is a little more expensive and rare in poland) and my feelings were that in low rpm the car was faster. That was because it had more air in bigger manifold tube, after throttle body. But in mid, and high rpms it was like a mule in comparison with stock D16Z6 manifold. Because then I wasn't completely sure that D15z6 and D16y8 were the same sizes inside I've tested the D16y8 as the second one. It was better, but still worse than stock d16z6 manifold. The car had some kind of lag, and slower response for hitting the acceleration pedal.

At the end I oversized the inlet of stock D16Z6 intake manifold and I put a throttle body from B16A2 on it (if I rememer it well, it's 60mm against stock 56mm - something like that).

And that's it. The response is quick. And in mid and high rpm's the old good d16z6 is really crazy. Most B16, and some B18 couldn't manage it on 1/4. The stock ones of course.

You can find some mine old vids on youtube (user 222majkel) to see how it goes from inside of the car.

To be completely honest I didn't tried to oversize the D15z6 or D16y8 intake manifolds. But the slower throttle response decided that I didn't wanted to. I think that in small D-series the fast response from low rpms is the most important thing. In that case the D16z6 intake manifold was always the best for me.

All credits go to majkel

I can say Poland forums are full of information, too bad Google translate is so bad with them