I have a D16y7 SOHC 5 SPEED MT Hey I was wondering if there is any differencese in swapimg my upwards facing manifold for the side facing manifold other than the direction AND THERE BOTH STOCK MANIFOLDS THANK IN ADVANCE.......

 

Nope.

 

Minor change in your powerband, but I mean MINOR. You won't notice the difference.

 

it may shift the peak torque a little higher but a power increase if any wouldn't be noticeable. on a non-stock motor (with non-trivial changes requiring dyno tuning) the Y7 will limit you more than the Y8 will.

personal opinion, but I think the Y8 looks better under the hood and plays a much sweeter sound-track when winding up through the rev range.

so change: yes. power increase: none, virtually.

 

On a Y7 the catalytic converter is part of the manifold but on a Y8 it can be replaced separately, can't it? That's an advantage but not a power advantage.

 

Damn.......wow....

 

I have tested extensively this setup on my car. 97 CX baselined 101.67 w/crush bent cat back. Adding DC Sports 4-1 increased power to 105.6. Adding the Y8 manifold increased power to 114.68. All test were on a DJ 248C using the factory OBD2 ECU and 87 octane fuel. Further tweaking resulted in a best of 122.15 using S-300V1, adjustable cam sprocket, underdrive pulley etc.The single largest improvement was from converting the intake manifold.I later added an Edelbrock and made a small improvement to peak power but average was the same.

 

Did you add an intake at the same time?

 

I have had people tell me a Y8 manifold makes a difference over the Z6 but I doubt it's noticeable. The only real power gains with these small engines is boost.

 

Back in the day I had one on a Z6, no noticeable difference at all.

 

I have tested Z6/Y8 back to back same day same dyno, no difference. Y7/ Y8 very noticeable difference. My baseline test wstock Y7 was with factory air box new filter. When testing the Y8 combo I optimized the air pipe using what was available free. The Edelbrock was tested with the same air pipe. I posted these results for the benefit of the op, not everyone has money for turbos, engine swaps etc. My thinking is that he may have access to the manifold in question and enjoy modding his car, combined with a similar exhaust to what I used he may get an additional 10-16 whp,without tuning. I certainly did. Ecu tuning extended the rev range and was worth a total of maybe 2-4 whp . In the end running ragged edge timing/afr it made 124.1 whp

 

Hasport built a Super D series engine and proved the Y8 manifold flowed better over the Z6 and A6. They also used GX pistons.

 

But how about a stock engine?

 

IDK try it out for us

 

I have no idea what the Hasport combo was but would like to see a link posted if possible. I have tested this twice. Once on a stock Z6,(IHE) no difference in average power. Study #2 was a Y8 with 12-1 compression, what folks called the "ZEX" cam (Comp) DC 4-1 header a dyno tested pipe length/diameter, no muffler (vehicle was an auto trans/bracket) car), both cars were tuned on Hondata by the same tuner. The average power was virtually the same with minor trade offs along the graph. For the average build use whichever one you have access to.

 

It was a Super D article in Honda Tuning magazine a couple years back.

Found the link:
http://www.superstreetonline.com/how...renchin-d16a6/

 

Thank you for posting the link.

 

great info in here!

 

^^^

Ahh yung grasshoppa

yu stick around and learn

 

You guys are jumping all over the place, the motor in question is a y7.

 

Yup. Did it on mine a couple months ago. But I had to buy the entire manifold anyway, and it came with a new cat, so I'm not sure if they can be bought separately from the manifold.

 

The OP is asking about the intake manifold, not the exhaust manifold. WTF

 

I really liked that article Bently glad I saw that