mr2ttd

I am thinking about swapping an HX cylinder head/intake manifold/ECU/O2 sensor onto my 96 EX 5 speed in an attempt to get even more stellar fuel economy.

Does anyone have first hand experience with this? My concern is since the VTEC-E is designed primarily for good fuel economy at low engine RPM's, that I may not see too much of a benefit without also using the tall-geared HX transmission.

Any input on this, or better yet, has anyone tried it? I already have the HX parts.

Thanks
Tony

blk92_d16

Sell what you have to make the money you would have saved in getting more fuel mileage. LOL

This coming for a proud owner of a '95 Ex coupe with a D15Z1 vtec-e!

teal_dx

never tried it, but the HX also uses a different wiring harness then the EX

Dasfinc

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mr2ttd &raquo;</TD></TR><TR><TD CLASS="quote">I am thinking about swapping an HX cylinder head/intake manifold/ECU/O2 sensor onto my 96 EX 5 speed in an attempt to get even more stellar fuel economy.

Does anyone have first hand experience with this? My concern is since the VTEC-E is designed primarily for good fuel economy at low engine RPM's, that I may not see too much of a benefit without also using the tall-geared HX transmission.

Any input on this, or better yet, has anyone tried it? I already have the HX parts.

Thanks
Tony
</TD></TR></TABLE>

I dunno about how bad the HX trans is, but the VX and CX transmissions are nearly TWICE as wide, as the Z6/Y8 transmissions and have a HUGE impact on gas mileage.

baller status

Well obviously you're going to get less freeway mpg due to the gear ratio. The EX cruises at 75 mph somewhere around 3500 RPM. I can't make any generalization about your street mpg because there are just too many variables. It will probably be similar to a stock Y5.

It's good to hear you're going to use the correct ECU/O2 sensor. I'm so embarrassed for all the people that say "I'm going to swap on a Y5 head and use a P28 ECU and it's going to be like normal VTEC".

rice is nice

so to do this d16y5 swap into a EK EX, you need the head, intake manifold, front 5 wire o2 sensor, ecu and hx engine harness?

teal_dx

the HX uses a different exhaust manifold with the cat built in under the header. Not sure if a regular header/cat on an EX will have any affect on your HX swap. You also might need the ECU harness as well, but you could get by if you pin & run a few wires by yourself.