Thinking about putting a d15z1 (VX) or d16y5 (HX) swap with their respective transmissions in my 92 cx hatch. I want to get the best gas mileage I possibly can. In other words, I'd be willing to sacrifice performance for MPG. What would you guys recommend for my motor/tranny combo, intake/air filter, intake manifold/exhaust manifold, exhaust piping size, ECU, etc.?

From what I read the stock VX gets about 47-56 MPG and the HX about 37-44 MPG.

 

trade your 92 cx for a 92 vx

 

Lets pretend I have no motor or tranny at all - starting from scratch

 

Sell your car and buy a moped or small motorcycle.

 

What's wrong with a CX motor?

 

you're not going to get better than a cx motor, its powerless as it is!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Kendall &raquo;</TD></TR><TR><TD CLASS="quote">What's wrong with a CX motor?</TD></TR></TABLE>
the vx gets better mpg.
http://autos.msn.com/research/...sub=0

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AThiker &raquo;</TD></TR><TR><TD CLASS="quote">Thinking about putting a d15z1 (VX) or d16y5 (HX) swap with their respective transmissions in my 92 cx hatch. I want to get the best gas mileage I possibly can. In other words, I'd be willing to sacrifice performance for MPG. What would you guys recommend for my motor/tranny combo, intake/air filter, intake manifold/exhaust manifold, exhaust piping size, ECU, etc.?

From what I read the stock VX gets about 47-56 MPG and the HX about 37-44 MPG.</TD></TR></TABLE>

I have been trying to get good answers out of this crowd, but frequently they like to comment on stuff I do not ask about. Or they just like to comment about Driving style, and other stuff.
Although, a VX engine with a VX transmission, would be a good thing. I am not sure if some of the high performance stuff will help. But I can think if the items are lighter, than it is a good start. Some of these people will say some of the items only help out on high RPM's. So I am not sure. You might be on the cutting edge of developement.
First you want to search about D series modifications. Now most modifications and bolt on's have a little research about them and the interactions with the D16 Motor.
If those items are compatible for the VX engine, than those items should help.
Also LIGHTER is almost always better. So if a modification and a stock item have equal performance, look at the difference in weight.
Make sure all your modifications are legal for your state.
Also some of the modifications can actually hurt your gas mileage if you drive agressively.
As for the manifold, I am trying to find out about SKunk or Edelberg. The performane headers are all lighter in weight if they are one pieces instead of two pieces.
I am thinking the bigger the exhaust and the exhaust piping the better.

How do you feel about ripping out the power steering and air conditioning?

I am clueless about the ECU. My guess is something really lean, which is what I think the VX already has.

Good luck and check out my post as well. It might help.
https://honda-tech.com/zerothread?id=1205005

WTB A CARB legal perfomance 4-2-1 Header from the Socal area. AKA I want to pick it up.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Harvey_Hx &raquo;</TD></TR><TR><TD CLASS="quote">trade your 92 cx for a 92 vx </TD></TR></TABLE>
I agree with this guy... The vx comes with rpm tach, and also the wheels are a lot lighter. It weight nothing without tires, nothing.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Kendall &raquo;</TD></TR><TR><TD CLASS="quote">What's wrong with a CX motor?</TD></TR></TABLE>
8valves, and it does not have the cool vtec-e.

 

Get a VX engine. The CX and VX transmissions are the same, so either will do. The CX is the lightest of them all, so IMO, it'll be better for MPG. Get the lightest 13" wheels you can find. Do a good tune-up. Get a K&N drop-in air filter. Make sure your O2 sensor is up to par. Make sure your catalytic converter is up to par. Find a VX diffusor for the rear (hard to find, but you never know).

 

take off the a/c and powe steering less drag & weight

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jlacoy82 &raquo;</TD></TR><TR><TD CLASS="quote">Sell your car and buy a moped or small motorcycle.</TD></TR></TABLE>

Hahaha

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jlacoy82 &raquo;</TD></TR><TR><TD CLASS="quote">Sell your car and buy a moped or small motorcycle.</TD></TR></TABLE>

Very good idea, but I have passengers and pretty much live out of my car.

Thanks for all the responses. Car already has no AC and PS. I've got some Rota C8s with 205/50/15 Falken Ziex's, DC 4-1 header, AEM 3" CAI w/ K&N, Apexi WS2 (60mm?) right now. I know essentially nothing about physics, but can you increase MPG but putting on a larger diameter wheel/tire combo?

I thought the VX and HX had the CVT tranny?

 

The difference in fuel economy between the CX and VX is realistically negligible, unless you plan on keeping the VX long enough to justify the extra cost over your current CX.

The biggest thing you can change is your driving style, followed by keeping your car in good condition.

I bet I can get better mileage in your CX than you can get in a VX.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Outrun &raquo;</TD></TR><TR><TD CLASS="quote">The difference in fuel economy between the CX and VX is realistically negligible, unless you plan on keeping the VX long enough to justify the extra cost over your current CX.

The biggest thing you can change is your driving style, followed by keeping your car in good condition.

I bet I can get better mileage in your CX than you can get in a VX.</TD></TR></TABLE>

Well, I actually have a d16z6 swap getting up there in the miles so I'm just think of my next motor for it.

Anyone ever swap in a motor/tranny from an Insight?
--1.0 liter
--3 cyl
--73 HP
--61-68 MPG

 

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

Very good idea, but I have passengers and pretty much live out of my car.

Thanks for all the responses. Car already has no AC and PS. I've got some Rota C8s with 205/50/15 Falken Ziex's, DC 4-1 header, AEM 3" CAI w/ K&N, Apexi WS2 (60mm?) right now. I know essentially nothing about physics, but can you increase MPG but putting on a larger diameter wheel/tire combo?

I thought the VX and HX had the CVT tranny?</TD></TR></TABLE>

Usually not, I mean it will give you higher gearing, but the amount of rolling resistance they will add and the increase in rotational weight will give you worse gas mileage.

Well the CVT transmission isn't available until 96-2000 which weren't the best Gas mileage years. The CVT tranny isn't that great anyways. According to consumer guide, the same motor got better mileage with the 5speed than with the CVT transmission. If you really want an auto, the CVT is by far the most efficeint auto, but manual gives better gas mileage than auto of course.

A clean car has less drag, not much but hey you need every little bit for them big numbers! Lowering the car helps a little bit on gasmileage. I can only imagine a front lip would help too. If you can't find a VX diffuser i think you can buy them through honda for lotsa $$$

I'll try to respond to this thread a lot, I'm Very intersted in this project.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by red91sit &raquo;</TD></TR><TR><TD CLASS="quote">

Usually not, I mean it will give you higher gearing, but the amount of rolling resistance they will add and the increase in rotational weight will give you worse gas mileage.

Well the CVT transmission isn't available until 96-2000 which weren't the best Gas mileage years. The CVT tranny isn't that great anyways. According to consumer guide, the same motor got better mileage with the 5speed than with the CVT transmission. If you really want an auto, the CVT is by far the most efficeint auto, but manual gives better gas mileage than auto of course.

A clean car has less drag, not much but hey you need every little bit for them big numbers! Lowering the car helps a little bit on gasmileage. I can only imagine a front lip would help too. If you can't find a VX diffuser i think you can buy them through honda for lotsa $$$

I'll try to respond to this thread a lot, I'm Very intersted in this project.
</TD></TR></TABLE>

Car dropped on Omni's and I have an OEM front lip Currently looking for a VX diffuser.

Say I go with the 92 HP VX D15Z1 (if I can find one of course), would the VX/CX or HX transmission give me better gas mileage or are they same?

Thanks to all who respond

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jlacoy82 &raquo;</TD></TR><TR><TD CLASS="quote">Sell your car and buy a moped or small motorcycle.</TD></TR></TABLE>Hondas are 4 wheel motorcycles.

 

I have a D16Z6 with 223,xxx miles and it still gets 38-40mpg.

You need to estimate how long it will take for a VX swap to save you money in the long run. If you get a swap now and sell the car in a few years you may still end up not recouping any savings.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AThiker &raquo;</TD></TR><TR><TD CLASS="quote"> Building a gas mileage monster ... </TD></TR></TABLE>


my friend has a k20 in an integra that beats ls/vtecs in eg's

and he's getting 36 mpg.

 

I'm with CRXDX. When my 43x,xxxkm D15B7 ever dies, I'm going to swap in a K20A2.

 

that cx motor=shitty powerless 8 valve but is great on gas milage and it doesnt have any emissions it burns really clean

 

a vx gets such good gas mileage man. let me tell you, i drove around the whole day with 4 gallons in my tank

 

i love my vx.

heres a few links that you should read.

Losing 114 Pounds
https://honda-tech.com/zerothread?id=693678

^i'm currently doing this one, i'm gonna replace the carpet and redo the whole interior, only things i have left is the headliner, carpet, and the pillars to remove. I've been driving tonite and i can really tell the differnt with out all the weight. but as you said before people pretty much live in your car. so you wouldnt want to do this.

Weight for the 1992-1995 Hatchbacks
https://honda-tech.com/zerothread?id=150315

Performance questions for D15Z1
https://honda-tech.com/zerothread?id=400281

Massive how to's archive and good information
https://honda-tech.com/zerothread?id=642479

i cant find it right now but there is another guy on here that Turbo'd his VX

 

What about the d15b-e sohc vtec, wasnt that engine about 70hp and all about gas mileage.

Come to think about it, its kinda like the vx engine