D15Z1 Intake Manifold - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Reply
 
Thread Tools Display Modes
 
Old 01-01-2008, 02:23 AM   #1
Registered Member
 
Join Date: Oct 2007
Posts: 298
Country: United States
D15Z1 Intake Manifold

I finally got my D15Z1 yesterday. At $125 with ECU and EGR control box, it was certainly not a bad deal. BUT, it came with the larger DX/LX intake manifold rather than the VX manifold. I know that this manifold will probably not work optimally, given that the runners are SO much larger than the intake ports. Notice the size difference between port size here and the mark from the intake manifold gasket.



So I was wondering whether there might be an alternative available to the VX manifold. I know that both the 1988-1991 HF manifold and the 1992-1995 CX manifold are similar in size to the VX manifold. Will either of these work? And do the ports properly line up? Or am I going to be stuck having to find a VX manifold?
__________________

StorminMatt is offline   Reply With Quote
Old 01-01-2008, 08:03 AM   #2
Registered Member
 
Join Date: Aug 2006
Posts: 171
Country: United States
Send a message via AIM to Brian D.
If it turns out that a CX or HF manifold would work, I've got both. Either way, let me know; I'm curious also.
__________________

__________________
GAS GSLR
Brian D. is offline   Reply With Quote
Old 01-01-2008, 08:50 AM   #3
Registered Member
 
GasSavers_TomO's Avatar
 
Join Date: Oct 2006
Posts: 1,108
Country: United States
Send a message via AIM to GasSavers_TomO Send a message via MSN to GasSavers_TomO Send a message via Yahoo to GasSavers_TomO
CX manifold will work, plus you should be able to grab one from some kid that is swapping it out for a larger manifold for free. I'm not 100% certain that the HF manifold will work properly, but since you have the manifold off of the Z1 already, it wouldn't hurt to try if you can get one easily.
__________________

Honda Civic VX Info/Links
Remember to use good Webiquette!
Quote:
Originally Posted by ezeedee View Post
controversy is an idea thought up by weak people who are too afraid to hear the truth.
GasSavers_TomO is offline   Reply With Quote
Old 01-01-2008, 10:29 AM   #4
Registered Member
 
Danronian's Avatar
 
Join Date: Aug 2007
Posts: 652
Country: United States
I don't think finding the VX manifold would be too hard. I've seen a few for sale on ebay before.

The CX probably has a similar size to the VX, but I would look for the VX since it's the only OBD1 intake for a D series with an EGR.

The HF intake manifold might work fine since it does have the EGR and is MPFI, but I think that one will be just as hard to find, and I don't know if it has the tiny intake ports of the VX.

The HX manifold would probably work, but it will lack the IAT sensor, but you could add one pretty easily. The issue wth the HX would be that the intake ports are large since it's basically an EX intake with an EGR on it instead of vtec-e specific as the VX intake is.

If you want to give the HX manifold a try there is one at my local junkyard and I might have seen the HF manfold there too, but I'm not so sure about the HF.
__________________


On the never-ending quest for better gas mileage...
Danronian is offline   Reply With Quote
Old 01-01-2008, 05:11 PM   #5
Registered Member
 
Join Date: Oct 2007
Posts: 298
Country: United States
At my local junkyards, I have seen a good number of HFs and CXs. But NO VXs. I guess these are ALOT less common. Also, doesn't the CX manifold have a place for the EGR with a blind hole for the valve and untapped holes for the screws? I almost want to say that this is what I saw at the junkyard. Anyone have pics? If this is the case, then it seemslike it wouldn't be too hard to get the CX manifold set up for EGR. Then again, I would have to find an EGR valve. But maybe one from an HF would fit.
StorminMatt is offline   Reply With Quote
Old 01-01-2008, 08:16 PM   #6
Registered Member
 
Join Date: Aug 2006
Posts: 171
Country: United States
Send a message via AIM to Brian D.
HF manifold?

Well, if it turns out to be an HF manifold that you need, I have one in my shed that I was hoping to one day have polished. As it currently sits, it is stock, as removed from the car. If you need the EGR valve with it, I have that on it as well. It is currently complete, with all sensors in it...but I hoped to keep those. Just let me know if you need the manifold & EGR...or whatever else; I wouldn't be looking to rob you.
__________________
GAS GSLR
Brian D. is offline   Reply With Quote
Old 01-02-2008, 12:56 AM   #7
Registered Member
 
Join Date: Oct 2007
Posts: 298
Country: United States
Quote:
Originally Posted by Brian D. View Post
Well, if it turns out to be an HF manifold that you need, I have one in my shed that I was hoping to one day have polished. As it currently sits, it is stock, as removed from the car. If you need the EGR valve with it, I have that on it as well. It is currently complete, with all sensors in it...but I hoped to keep those. Just let me know if you need the manifold & EGR...or whatever else; I wouldn't be looking to rob you.
How much would you want for it? I need to take a look first to see what I can get locally, as I know that shipping could very well kill the deal.
StorminMatt is offline   Reply With Quote
Old 01-02-2008, 07:21 AM   #8
Driving on E
 
Matt Timion's Avatar
 
Join Date: Sep 2005
Posts: 3,110
Country: United States
I'm willing to bet that the CX manifold is identical to the VX manifold. The HF Manifold MIGHT work, but since it's obd0 the MAP sensor is in a different place (obd0 is mounted on the firewall, not the IM itself).

then again, is the EGR on the intake manifold, or is it mounted to the block? Either way, check ebay first, or put a "for trade" ad on honda-tech or craigslist. Trade your big one for a small one.
Matt Timion is offline   Reply With Quote
Old 01-02-2008, 06:04 PM   #9
Registered Member
 
Danronian's Avatar
 
Join Date: Aug 2007
Posts: 652
Country: United States
Quote:
Originally Posted by StorminMatt View Post
At my local junkyards, I have seen a good number of HFs and CXs. But NO VXs. I guess these are ALOT less common. Also, doesn't the CX manifold have a place for the EGR with a blind hole for the valve and untapped holes for the screws? I almost want to say that this is what I saw at the junkyard. Anyone have pics? If this is the case, then it seemslike it wouldn't be too hard to get the CX manifold set up for EGR. Then again, I would have to find an EGR valve. But maybe one from an HF would fit.
You could probably drill out the mounting "boss" for the EGR on the CX manifold, but it might be hard to get it right. I would just hold out till you find the VX manifold since I don't know if lean-burn will work right w/o the EGR.
__________________


On the never-ending quest for better gas mileage...
Danronian is offline   Reply With Quote
Old 01-04-2008, 03:58 AM   #10
Registered Member
 
Join Date: Oct 2007
Posts: 298
Country: United States
Quote:
Originally Posted by Danronian View Post
You could probably drill out the mounting "boss" for the EGR on the CX manifold, but it might be hard to get it right. I would just hold out till you find the VX manifold since I don't know if lean-burn will work right w/o the EGR.
I actually had a look at a CX intake manifold today. And it is not even 'roughed in' for the EGR valve. This is quite interesting, as it almost certainly costed Honda more to do things this way vs either 'roughing in' the CX manifold for EGR or having a block-off plate. So I guess I will have to look for a VX manifold.

As for lean burn without EGR, I don't see why this wouldn't be possible. But it certainly wouldn't happen. Having no EGR would cause a check engine light (code 12), which would certainly cause the ECU to not run in lean burn (the previous owner probably ran it with a P28 to avoid a check engine light). It would also cause the ECU to run in open loop mode, which would be GREATLY detrimental to FE. Not to mention that it would fail smog visually, at the very least.
__________________

StorminMatt is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Gearbox dropdown greyed out; missing engines? synergist Fuelly Web Support and Community News 2 09-05-2013 08:48 AM
6 fuel-ups in two months now 6 fuel-ups a month? acebrock Fuelly Web Support and Community News 5 07-28-2011 02:29 AM
Large Fuel Tank capacity JQL Fuelly Web Support and Community News 7 04-04-2010 04:52 AM
Recovering faster from partial fill-up hufman Fuelly Web Support and Community News 12 01-12-2010 03:16 AM
Gallons per Mile? nerb Fuelly Web Support and Community News 1 11-12-2008 04:33 AM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 06:20 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.