hey i know Vx aren't that strong. but i have never run Vtec on my car before. and Plus the Vx head is free. i want to put it on my 94 Dx. you guys think it will run a little faster than just the Dx alone? just want to know if anyone has done a Vx head to Dx Block before and how it worked out. thanx

 

im actually tempted to put my d15z1 head on my d16z6 block since the vtec on the vx pulls harder than any sohc vtec car I have been in. I have a d15z1(vx motor) in my 4dr civic and when vtec engauges the car pulls ALOT. I love how noticable the speed increase is. But on every d16z6 I have driven you can only hear a high pitch whine but dont feel any difference in pull.

 

The VX uses a VTEC-E system, nothing like normal VTEC. Instead of changing to a more aggressive cam lobe at high RPM, the VX runs on twelve valves at low RMP and 16 at high RPM. The low RPM valve deactivation provides a more fuel efficient engine. The DX engine works like a VX would if VTEC was wired perminently on, so no, the swap is a huge waste of time and money.
You might want to have your butt dyno calibrated, or take your VX to a real dyno. An Si, stripped to the weight of a VX, will pull noticably harder.

 

Actually the VX head is a great head. The factory cam profile and vtec system is very unique compared to the rest of the vtec-e systems.

I say go for it. You'll need the entire head and then the d15z1 ecu.

I know that the d15z1 has the same torque numbers as a d16z6 but they come on way way earlier. That is why they are so noticable when vtec hits. It won't much top end but the bottom end would be great for a daily. The short skinny intake primaries and the tiny throttle body help out with the low end as well

 

If you run the VX ECU, you need the very pricey wideband O2 sensor and run wires for the EGR system.That's because down low it functions as a 12 valve engine, thus reaching maximum flow efficency earlier then 16 valve designs.The VTEC-E system locks in the extra rockers and makes it perform like just like a DX in the higher rev band.

The last VX I drove was a slug, and it was in perfect running order. Swapping to a VX head is a huge pain and expense for no real results.