i have heard that you can eliminate the vtec and make the motor run on all 16valves all the time instead of going from 12v to 16v @5700rpm. how do i do this? my motor is a D15B in a 97 civic ex. any tips? im not really a vtec fan. and i hate running on only 12valves, no power ha.

 

Maybe ask where you heard it from? It's a D-series. Pointless mod.
http://www.d-series.org/forums/engin...ller-cams.html

 

what do you expect to gain from this? it's surely not power.

 

hmm, i figured if it was running on all 16v that there would be a bit of a power increase or at least a little bit more acceleration. my 87 lude was SOHC 16v and it had a lot more pull and it was all stock ha.

 

of course that is probly because it was a 2.0 and now im driving on a 1.5 .

 

ive been thinking of selling the car anyway. i really dont like vtec. theres no power at all till it kicks in then when it does it doesnt really do much. vtec is a high school kids false sense of security haha!

 

you realize that as your car is only mapped to run on 12v's until the VTEC cross over point, you will lose power if you could enable VTEC constantly and it would run horribly

 

I wonder why Honda didn't think of that?

 

That's vtec-e, not regular vtec

OP since you haven't seemed to figure this out yet a vtec engine runs on 16 valves all the time. What changes is the cam profile at around 4800 RPM when it when it switches to a high lift cam profile (IE race cam) If you're familiar with aggressive race cams for V8s at all you'll know they idle like crap and suffer from poor driveability, the tradeoff being more power at high RPM. Vtec eliminates that issue.

If however you have a 3 stage D15B vtec yes it will run in vtec-e (12 valve mode) until around 3000 RPM and if you don't have the proper ECU it will run like crap. Yes you can feed 12v to the vtec-e solenoid so it stays in 16 valve mode all the time.

 

the smog tech i showed my motor too said it was a regular vtec not 3stage. i only have one solenoid. the engine is stamped D15B and the head is stamped P2J-4 with 96 stamped to the right of it. the guy i bought the car from put the JDM D15b in it. i didnt notice till after i bought it i thought it had the D16y8. i was greatly disappointed when i found out ha. i also didnt know that i am now going to have to referee the motor and ive been reading that no ref will approve a jdm motor right now.

 

and i dont feel the vtec kick in till it hits 5700rpm

 

Same engine.

 

by the way thanks for all the replies i really appreciate it guys! im new to the forum world ha

 

same engine as what?

 

The JDM D15B comes in a couple of flavors. The one you have is the equivalent to the D16Y8.

So, in truth, you aren't missing anything. Not that I know what you were expecting but if was some kind of Nightrider turbo boost when VTEC kicked in, like most people do, then you were mistaken.

 

so youre saying it IS a 3stage?
ha no i wasnt really expecting much. like i said im not really a vtec fan never was. i bought the car because i thought i was a good deal and i needed a car. timing belt snapped on my lude and ruined the head. im trying to post a picture of my motor but im not sure how to post pictures on here.

 

Where did I say that?

 

you didnt i just thought since its the same as the d16y8 that it meant it was a 3stage. sorry like i said im new to forums and new to the whole vtec thing

 

How can it be the same as a Y8 if the Y8 is NOT 3 stage?

 

 

oh i didnt know the y8 wasnt 3stage.

 

oh dammit. i guess im not allowed to post pictures?

 

You're not doing it right.

 

Yes you are. Read this sticky at the top.

 

the posting rules says "you may not post attachments"

and its not showing the paper clip attachment button.
ive got to go to work now ill try again later tonight. thanks guys