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Discussion Starter #1
I swapped from a d15 non vtec to a d16 vtec, the manifold went from 4-1-1 to 4-2-1 but I'm using the 4-1 manifold right now because I don't have a down pipe for the 4-2.

How much does this effect my performance? the d16 is running at about 160-170 compression (108k on d16,) and it just seems no better than the d15 non vtec I just had it in.. and driving it on the highway I could not pass 170 km/h with my foot completely to the floor for a good 5 minutes.. I could get to 220+ km/h with the d15... and it had 350,000 clicks on it and horrible compression.

I'm getting a Header soon but I was just curious if this is my main problem right now performance wise. Thanks.. sorry if covered already.
 

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Discussion Starter #4 (Edited)
did u change transmissions as well? that would explain the lower max speed

not sure about the rest...
No, same tranny.

do you have vtec engaging? that low cam will definitly hinder high rpm power.
I have no idea to be honest, I helped with a Dohc swap and it was very obvious, but I also helped with a sohc and it was almost impossible to tell without a tack..

I have no tack right now so I don't know if vtec is engaging, but it is wired and I'm not pulling any cels.. so i'm pretty sure vtec is going.
 

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No, same tranny.



I have no idea to be honest, I helped with a Dohc swap and it was very obvious, but I also helped with a sohc and it was almost impossible to tell without a tack..

I have no tack right now so I don't know if vtec is engaging, but it is wired and I'm not pulling any cels.. so i'm pretty sure vtec is going.
you should beable to hear it in the higher ranges. what ecu are yo urunning?
 

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does the power stop after 5000rpms? if so you are only on low cam. you can feel if the Hi cam isnt working around 6000rpms there is NO power at all. just slowly dies off in power.
 

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Discussion Starter #8
does the power stop after 5000rpms? if so you are only on low cam. you can feel if the Hi cam isnt working around 6000rpms there is NO power at all. just slowly dies off in power.
Low cam? what does that mean?

And ill try that vtec test tommorow.. i think im gonna shell out a few bucks for a tack tomorrow too ;)

Oh, and im running p28 ecu.
 
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