specv5150

Looking to get some help on this. Maybe Spade or any other knowledgable VTEC-E/HX guys can help me out. Is the D15Z1 the OBD1 version of the D16Y5?? Both are VTEC-E. Does the D15 head have the roller rockers. And the same ECU ( I think someone said the HX has a "lean out" system or some **** like that). I aks because if they are the same, I want to get the ECU off one and convert top OBD1 to get rid of the secondary O2 sensor. I can keep the VTEC-E fuel maps and what not and covert to OBD1. Any help would be great.

Bense

the d15z1 has roller rockers as well (i just found this out earlier tonight)

and check this out
d15z1
primary = 38.427mm
secondary = 32.292mm
exhaust = 37.997

d16z6
primary = 35.9mm
seconday = 36.195mm
mid = 38.107mm
exhaust = 38.008mm

D16Y5
Intake
Primary......38.4mm
Secondary..32mm
Exhaust.......38.8mm


taken from the honda service manual for USDM civics 92-95. Also, it looks like the exhaust lobe is actually more aggressive on the z6 than the z1, however the inches conversion in the manual specifies 1.4960inches for the exhaust on both the z6 and z1

FalkenSiR

d15z1 is useless. Now kill yourself or buy a more powerful motor.

Bense

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fast88std &raquo;</TD></TR><TR><TD CLASS="quote">d15z1 is useless. Now kill yourself or buy a more powerful motor.</TD></TR></TABLE>

shut up, i do more research than you.

FalkenSiR

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

shut up, i do more research than you. </TD></TR></TABLE>Of course you are... But because you are trying to get power out of a useless engine.

Bense

how is it useless?

Hondaciv95VX

it is...I have it.

FalkenSiR

It's a 91 cubic in. motor that makes 92 hp.
If you think about it, it's in the lowest powered fuel injected hondas. Jesus christ, 92 hp! If you don't shoot nitrous or turbo it then it is useless. It was made to be a fuel efficient motor. That's what vtec-e is all about. That should have come up in your research.

btw,
D15Z1
1.5 16VSOHC
VTEC-E PGM-FI
1493cc
92hp@5500rpm
97tq@4500rpm
92-95 Civic VX 9.2:1

Bense

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fast88std &raquo;</TD></TR><TR><TD CLASS="quote">It's a 91 cubic in. motor that makes 92 hp.
If you think about it, it's in the lowest powered fuel injected hondas. Jesus christ, 92 hp! If you don't shoot nitrous or turbo it then it is useless. It was made to be a fuel efficient motor. That's what vtec-e is all about. That should have come up in your research.

btw,
D15Z1
1.5 16VSOHC
VTEC-E PGM-FI
1493cc
92hp@5500rpm
97tq@4500rpm
92-95 Civic VX 9.2:1 </TD></TR></TABLE>

it has a more aggressive cam than the z6 and it has roller rockers. So this head actually has more potential than the z6. Just like spade pointed out that the y5 head has more potential than the y8 head. Because it has a more aggressive cam and roller rockers. You have to realize that the reason that it only makes 92hp is because that ecu is leaning the **** out of the fuel mixture. Which is why it requires a 5wire wideband o2 sensor. BTW, you're wrong, the d15b8 has 70hp, 22hp less than the d15z1. the E in VTEC-E is for EFFICIENCY, not economy. Last time i checked, the more efficient a motor is, the more potential it has.

VXJDMHATCH

i had that motor .... its a pain in the *** ... o2 sensor costs 450 bux at the dealer b.c its a 5 wire ... it is pretty much useless .. but believe it or not ... it beats any honda motor, gas milage wise, that is not a hybrid till this day ... 55 mpg


Modified by VXJDMHATCH at 9:22 AM 10/15/2005

Tyte4Door

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by VXJDMHATCH &raquo;</TD></TR><TR><TD CLASS="quote">i had that motor .... its a pain in the *** ... o2 sensor costs 450 bux at the dealer b.c its a 5 wire ... it is pretty much useless .. but believe it or not ... it beats any honda motor that is not a hybrid till this day ... 55 mpg </TD></TR></TABLE>

jesus christ that is high. i see alot of arguing about potential and whoever is right or wrong i think the whole point why people swap in alternate motors is because they are more powerful to begin with making it ALOT less time consuming and expensive then trying to squeeze every last bit of horsepower out of a slow motor. which is why i'm gonna trash can my D15 lx motor and get a B18C

FalkenSiR

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

it has a more aggressive cam than the z6 and it has roller rockers. So this head actually has more potential than the z6. Just like spade pointed out that the y5 head has more potential than the y8 head. Because it has a more aggressive cam and roller rockers. You have to realize that the reason that it only makes 92hp is because that ecu is leaning the **** out of the fuel mixture. Which is why it requires a 5wire wideband o2 sensor. </TD></TR></TABLE>

yadda yadda yadda... Show me the aftermarket for the marvelous automotive invention that the d15z1 is? Please, maybe you can try and convince a couple big name companies to offer aftermarket parts for these engines. Go ahead and try. You are saying that you found some deep secret in this engine that makes so much power when unleashed. Come on man, wake up. Where's the VTEC-E controller? If it had so much potential, then there would be more aftermarket for the d15z1 than the d16z6, because that's what you are saying right?
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Gordon Liddy &raquo;</TD></TR><TR><TD CLASS="quote">it has a more aggressive cam than the z6 and it has roller rockers. So this head actually has more potential than the z6. .....Last time i checked, the more efficient a motor is, the more potential it has.</TD></TR></TABLE>


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Gordon Liddy &raquo;</TD></TR><TR><TD CLASS="quote"> BTW, you're wrong, the d15b8 has 70hp, 22hp less than the d15z1.</TD></TR></TABLE>No I'm not.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fast88std &raquo;</TD></TR><TR><TD CLASS="quote">t's <U>in the lowest</U> powered fuel injected hondas.</TD></TR></TABLE>

Jorsher

Anyways why don't you people just answer his question. Yes it's a weak engine, no efficiency doesn't always mean it has more potential (there are many inefficient engines that have a ton of potential), but if he wants to try to make this puny engine fast just help him with his questions lol.

specv5150

WOW year and a half later. Why would someone bring this back up from the dead? Since me asking this questions I have turboed my D16Y5 and had ALOT fun with it. I really only asked for ECU purposes. I had no intentions on swapping the engine especially for a Z6 or Y8 with only 12 more HP. NOt worth the time and energy. Besides I prefer to work with the engine I have vs buying overpriced crap. Sure the aftermakret is slim pickings but with turbo and my goals it didnt really matter. Once you ditch the ECU, the Y5 isnt bad. Sure you cant go on ebay or your local performance shop and get a cam, but I think aftermarket support is a bit overrated. Oh my god you cant get a m4d l337 cam for your Y5 VTAK-E but if you never have intentions of getting one, why does it matter. Alot of the good stuff (ie turbo) is interchangeable. And I thought there a place that had cams for the Y5. Not like I really care if there is or not. My Y5 has been good to me

lazie

if you actually have the z1 in your car and thinking about doing stuff to your car than read on, i know this is kinda off topic but it would help

if your looking for power your gonna have to swap something else in there no avoiding it. the engine was made for FUEL EFFICIENCY NOTHING ELSE! if you want the thing to be really fun to drive there are a few things that you can do to make it drive better.

this would be the most helpful thread that can be found on a VX/d15z1 on this board https://honda-tech.com/zerothread?id=400281 i
f you find something better please let us know. i've spent countless hours on the net looking for stuff on this board for my car as well as others have and have found this to best the most helpful.

next i would do the Suspension, do it. I mean all of it. Dont leave nothing out. if you need help or any questions thats what the suspension forum is for.

dont fret if you cant find any thing else you can always do the following as what many others have dont to there hatches

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

or you can take the route of verry few if any out there and TURBO IT! yes it is possible!

https://honda-tech.com/zerothread?id=1094480
https://honda-tech.com/zerothread?id=1139109
i dont think the pics from those links work any more but if you have any questions about it i'm sure you can always pm that user 'Built B16A'

i know it was kinda off topic to go that in to it but what the hey i've seen too many people come on to here and start asking questions w/o searching and getting Ahole responses from people telling them to search frist with out actually helping.

maybe sometime i'll actually make a faq when i think i know enough about the car to actually help people.

Bense

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fast88std &raquo;</TD></TR><TR><TD CLASS="quote">yadda yadda yadda... Show me the aftermarket for the marvelous automotive invention that the d15z1 is? Please, maybe you can try and convince a couple big name companies to offer aftermarket parts for these engines. Go ahead and try. You are saying that you found some deep secret in this engine that makes so much power when unleashed. Come on man, wake up. Where's the VTEC-E controller? If it had so much potential, then there would be more aftermarket for the d15z1 than the d16z6, because that's what you are saying right?

No I'm not. </TD></TR></TABLE>

you can use z6 aftermarket springs and valves. VTEC-E controller? i don't know if you realize this, but the d15z1 has a vtec solenoid just like the d15z6. so a VAFC will work on this head as it will any other VTEC head.

Bense

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tyte4Door &raquo;</TD></TR><TR><TD CLASS="quote">jesus christ that is high. i see alot of arguing about potential and whoever is right or wrong i think the whole point why people swap in alternate motors is because they are more powerful to begin with making it ALOT less time consuming and expensive then trying to squeeze every last bit of horsepower out of a slow motor. which is why i'm gonna trash can my D15 lx motor and get a B18C</TD></TR></TABLE>


you mean to tell me that an engine swap that costs over 6 times the amount of a d-series swap makes more power? What an amazing concept.


At one time i did have the infamous setup of a built b18c1 with a sc61 turbo. But that setup got stolen from me. and i had to put a d-series motor in my car just to get from A to B. I am not arguing that D series has more potential than B series. I have already invested an assload in a motor setup just to have it all stolen. Not about to dump another 8k under my hood again.

All i am saying is that for a D series, the d15z1 has more potential than a d15z6 and that a d16y5 head has more potential than a d16y8. Stock vs. stock of course. Yes there is no aftermarket cam support, but the whole idea of having a d-series is cause it's cheaper than a b-series. What's the point of building the **** out of a z6/y8 head when you can just get a b18b swap for cheaper and be just as fast. Besides, like the original poster said, it's not like i'm going to be wanting to change the cam anyways.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jorsher &raquo;</TD></TR><TR><TD CLASS="quote">Anyways why don't you people just answer his question. Yes it's a weak engine, no efficiency doesn't always mean it has more potential (there are many inefficient engines that have a ton of potential), but if he wants to try to make this puny engine fast just help him with his questions lol.</TD></TR></TABLE>

does the term Volumetric Efficiency mean anything to you? Why is it that people upgrade their i/h/e and somehow get more hp and better gas mileage? Wow, what an amazing concept!