gildmi

I am looking to puchase a new civic as a daily driver to get teh best mpg and i was wondering the best swap to do this. Can i use a d16y5 head on a d16y8 or just swap teh cam and computer and o2 sensor. Also are the pistons in a d16y8 different then the ones in a d16y5? Let me know of any ideas. Thanks

Felliph3

Get a D15Z1,42MPG.VTEC-E

Relic1

D15Z1 with the 5-wire (wideband) O2 and 49 state emissions P07.
I used to get 40-45mpg in town, 50+ on the highway.

gildmi

would i need to swap teh wire harness as well?
i heard the d15z1 disadvantage was that it didnot accelerate quickly.
I am also havnig trouble finding the block and heads and ecu any places to get one let me know. Thanks alot.

Relic1

accelerate quickly and high mpg do not tend to work together.
VX/P07/D15Z1 - 92hp@5500 97ft/lbs@4500
since you're working with OBD2, you can stick with the HX setup. D16Y5 with the P2N and wideband O2. But still pull in 115hp@6200 104ft/lbs@5400
But the Z1 will get you better mpg figures.

Also keeping your foot away from the firewall will drastically increase your mpg.

If you're picking up a new civic as a daily driver, why not pick up an HX or VX and enjoy it as is?

allricedout

Z1 ftmfw. and if you wanted a little more pep without sacrificing too much MPG, id reccommend an si transmission with closer gear ratios.

gildmi

there are no hx or vx in my area closest vx is 500 miles away and the hx models are not much closer, i found one but it has a blown tranny and he still wants 5000 but thank you for the information

sundownz

My 94' DX hatch with a D15B7 got 40 - 44 MPG totally stock... and they are cheap engines.

pythoner

my 92 cx has gotten as high as 46 in the city...but it gets 37~ normally

hondajunkee

you could always get yourself a crx hf motor d16b6 i think and get 50+ mpg, and have a cool 62 hp

MR.johnson

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hondajunkee &raquo;</TD></TR><TR><TD CLASS="quote">you could always get yourself a crx hf motor d16b6 i think and get 50+ mpg, and have a cool 62 hp</TD></TR></TABLE>

lol runs out of power @ 4500.

93eg2james

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hondajunkee &raquo;</TD></TR><TR><TD CLASS="quote">you could always get yourself a crx hf motor d16b6 i think and get 50+ mpg, and have a cool 62 hp</TD></TR></TABLE>

Never heard of that... cool though well kinda

Eran

iTrader: (1)

Screw it, get a Vespa.

93eg2james

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Eran &raquo;</TD></TR><TR><TD CLASS="quote">Screw it, get a Vespa.</TD></TR></TABLE>

EK_B

Damn I wish I got that kind of mileage.

MR.johnson

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93eg2james &raquo;</TD></TR><TR><TD CLASS="quote">

</TD></TR></TABLE>


wheelie monster

gildmi

vespas dont help when i need to drive 300 miles one way on the highway but i like it
if i have an hx d16y5 vtece motor and increase the compression to 9.6 from 9.4 be cause of regular vtec pistons would there be any noticable effect?


Modified by gildmi at 9:24 AM 3/7/2007

Relic1

if you're going to use the stock ECU and hope that the lean burn mode that gets the HX/VX's higher mpg ratings then I wouldn't mess with the engine at all. If you want to convert to OBD1 and have it tuned then you can do what ever you want, but you're not going to have the lean burn mode.

gildmi

im thinking using a vtec motor putting in a hx cam and hx ecu and hx o2 sensor, i would probably need roller rockers too

Eran

iTrader: (1)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by gildmi &raquo;</TD></TR><TR><TD CLASS="quote">im thinking using a vtec motor putting in a hx cam and hx ecu and hx o2 sensor, i would probably need roller rockers too</TD></TR></TABLE>

Smart boy

gildmi

does anyone know where i can get a y5 ecu, cam, roller, rockers, and o2 sensor
also i was wondering if the vtec would idle fine even thought the pistons are not dished as much (2.12 vs 2.7) with the swirl in the head and also if the compression ratio would hurt or help the idle, but i think it would run fine thanks

Relic1

I know only a little about the Y5, but if it's anything like the Z1 you can't simply slap on the ECU, cams and O2 to get the right combination.
There is a lot to the way the combustion chamber is shaped to keep the swirl correct to be able to run as lean as it does down the road and not melt things.

I could be wrong about all this talk that I've done in this thread, but combustion chamber temps are not something that is easily to monitor. EGTs are about the only thing you can go by, but if you're not tuning and things are wrong... you will make holes in pistons fast.

this will mark the end of my replies to this thread.

gildmi

the heads of the y8 and y5 are the same cast they just have different pistons both dished one is just 2 ccs dished more than the other