New to the Eco mod territory... ('96 Civic hatch with HX lean burn engine swap)

[Outlaws69]

Originally Posted by darcane

Good, another HX (sort of) and looks like your a local (I'm in Puyallup).

When you swapped, I assume you used the D16Y5 ECU, wiring harness, and O2 sensor, right? Are you using any sort of instrumentation to verify that it's going into Lean Burn mode?

Yes, I used all Y5 EQ! ECU, wiring and all. No instrument, any recommendation?

[darcane]

Originally Posted by Outlaws69

Yes, I used all Y5 EQ! ECU, wiring and all. No instrument, any recommendation?

The UltraGauge and Scan Gauge II are both quite popular on here and just plug into your OBDII port. They are easy to hook up and use. I use an UG and am pretty happy with it (good features and inexpensive).

Both have one problem... they can't accurately report fuel economy on a Lean Burn engine. To do that, you need to tap into the fuel injector circuits and an MPGuino can do that.

Even with the UG or SGII, you can tell when it enters Lean Burn mode, you just can't rely on the MPG data while it's in Lean Burn.

[PaleMelanesian]

Originally Posted by Outlaws69

D16Y7
SOHC, 16v, 85hp, 36mpg avg,

D16Y5
SOHC, 16v, 125hp, 44mpg avg

The biggest different is that the D16Y5 is a Vtec-E. it only operate 12v below 2800 rpm, it also has a lean burn feature that allows to to run 58:1 A:f ratio on 5th gear between 1900-3000 rpm depending on load. So in simple terms, if you stay off the gas paddle and below 70mph @2900rpm it uses 75% of the 1.6l and inject only 20% of normal fuel amount. Hope this help!!

Last I checked, the D16y7 is 106 hp, not 85, and the Y5 is 115 hp, not 125. You'll be gaining a bit, but not as much as what you posted.

Also, I highly doubt it goes as lean as 58:1. More like 22:1, while the Insight goes as lean as 25:1.

It'll be good, and I'd love to have an HX engine, but don't oversell your expectations.

[Outlaws69]

Correction made, thanks for the info.

[PaleMelanesian]

Considering you have to replace the engine, there's no other way I'd go. You have the HX transmission as well, right? Can you report the rpm in top gear at 60 mph? I'm running about 2500 rpm.

[Outlaws69]

Originally Posted by PaleMelanesian

Considering you have to replace the engine, there's no other way I'd go. You have the HX transmission as well, right? Can you report the rpm in top gear at 60 mph? I'm running about 2500 rpm.

60mph @ 2400
63mph @ 2500

[Outlaws69]

Originally Posted by darcane

The UltraGauge and Scan Gauge II... ...
Even with the UG or SGII, you can tell when it enters Lean Burn mode, you just can't rely on the MPG data while it's in Lean Burn.

Good info, would you please explaine more on I can tell when it enters lean burn!!!

[turbovr41991]

Nice to see another HX swapped EK hatchback. Mine uses a VX trans, but same HX engine ecu, etc. your goal of 50 MPG should be pretty easy to hit. Just need to figure out how to drive that new engine of yours!

I still have issues getting in lean burn whatever I want at low RPMs. It is really picky at the 1900 rpm level. I have figured out how to use the low speed lean burn, but if I hit traffic and kick out, it will not go back in at the lower rpm. At 2400-2500 it seems perfectly fine though. Still troubleshooting it.

Below is the link to my build thread.

http://ecomodder.com/forum/showthrea...wap-23235.html

[Outlaws69]

This is a lot more involved than I think... ... So much to learn! Just picked up some Marvel Mystery Oil and added 4oz, have the tank topped off. 500miles break in is completed. Lighter oil will be going in this weekend, tire pressures will be going up as well(it was left at 36psi to see the different between the Y7 and Y5). Will be advancing the timing as well. All the little things will be done!!! Will up date next week for results.

[turbovr41991]

awesome! good luck!