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1095 Views 10 Replies 5 Participants Last post by Fast510, Jan 6, 2007

Fast510

Discussion Starter · Jan 5, 2007

But I have some questions about the D15Z1, (and don't tell me not to do it 'cause even if I have to do it myself I will figure it out, help is extremely appreciated though). Now before I ask anything I will say that I was a good noob and used the "search" button first, (and if any other noobs read this post, the search button works WONDERS, lol). Anyways, I currently own a 1992 VX Hatch with a D15Z1. The mods currently done are as follows:

Engine/Fuel:
Injen Short Ram Intake (with a J's racing carbon intake on the way)
D16(something) Intake Manifold
1996 EK (not sure engine code) Throttle Body
AEM High Flow Fuel Filter
Sun Auto Voltage System
Walbro 255lph Fuel Pump

Income Tax Return modifications:
GReddy 4-2-1 Header
Skunk2 Cat Back Exhaust
Skunk2 Test Pipe

So now that that's out of the way, first question. I know that this thing has E V-TEC and i've heard that it can pop like regular V-TEC with a modified/aftermarket cam. So does anyone make an aftermarket cam for this engine? Or am I going to have to have someone grind the stock one? And does anyone make aftermarket springs/retainers?

Second question. What other D-series engines have interchangeable parts with this engine? Mainly for aftermarket use.

Third. I read a post saying to get a P28 ECU and a D16Z6 EX/Si Tranny and put them on this engine. What are the significances? And can I use my stock shafts, etc. or do I need the ones off of the other tranny?

Fourth. This forum is amazing and I plan on staying. Okay not really a question but I thought I should just throw that out there.

Thanks!

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siregcivic

· #2 · Jan 5, 2007

the d15z1 is an alright motor.. im using it with boost.. but im also using a y8 head so i have the regular vtec.. but i wouldnt put a regular vtec head like the z6 or the y8 on the z1 block.. it drops the compression way too low for any streetable na power its about 8.04:1 with a y8 head and 7.8:1 with a z6 head...

what intake manifold are you using right now and what ecu?? i tried using a p28 on my friends vx once.. and it ran like crap.. when i was still na on the complete vx motor i was using a p28 that was chipped with vtec engagement at 4k and i was using the ex trans intake header exhaust.. it ran a 9.93 in the eigth mile.. wich isnt that fast. but thats still mid 15's!!!!

talk to bense or transzex on here.. i think they know where to get the vx cam reground to have some nice lobes.. but either way you WILL NEED A TUNE for that motor to run any better then it does now..

anyways.. gl with your setup and being different:alky:

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Orion

· #3 · Jan 5, 2007

siregcivic said:
but i wouldnt put a regular vtec head like the z6 or the y8 on the z1 block.. it drops the compression way too low for any streetable na power its about 8.04:1 with a y8 head and 7.8:1 with a z6 head...

You can just put the z6/y8 rocker assembly and cam in the z1 head iirc. Either that or it is the other Vtec-E engine that can do that trick.

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leftbraned

· #4 · Jan 5, 2007

thats a huge question! The best part about sohc d's is that so many parts are interchangable. The trans will blow your mind when you swap it in. It has much better gear ratios which makes better use of your power. I went from a 4spd to the si cable trans in my hatch and it is the single best mod I've done.

I'm not sure on newer ones but I'd be surprised if you cant find stock axles that will work for the swap.

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siregcivic

· #5 · Jan 5, 2007

Orion said:
You can just put the z6/y8 rocker assembly and cam in the z1 head iirc. Either that or it is the other Vtec-E engine that can do that trick.

i dont know if the valvesprings can handle the higher lift of the regular vtec cam... plus the ports on that head are hella small on the intake side

heres a comparison of a y8 intake mani gasket on the z1 head

also stock axles will be fine from the vx to ex trans

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Eyal 951

· #6 · Jan 5, 2007

I would swap the head to a Z6 or Y8 head, and change pistons.

You've spent money on stuff you really don't need. Why that fuel pump, and that "voltage" system? And just so everyone knows, the AEM "high flow" fuel filter is a Napa Gold filter painted and sold for a rediculous amount. High flow fuel filter? hahaha.

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siregcivic

· #7 · Jan 5, 2007

Eyal 951 said:
I would swap the head to a Z6 or Y8 head, and change pistons.

You've spent money on stuff you really don't need. Why that fuel pump, and that "voltage" system? And just so everyone knows, the AEM "high flow" fuel filter is a Napa Gold filter painted and sold for a rediculous amount. High flow fuel filter? hahaha.

the ONLY pistons that will go into that motor and fit right is the d15b vtec pistons.. good luck on getting a set of those

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Fast510

Discussion Starter · #8 · Jan 6, 2007

Eyal 951 said:
I would swap the head to a Z6 or Y8 head, and change pistons.

You've spent money on stuff you really don't need. Why that fuel pump, and that "voltage" system? And just so everyone knows, the AEM "high flow" fuel filter is a Napa Gold filter painted and sold for a rediculous amount. High flow fuel filter? hahaha.

Well, technically it isn't my car persay. It's kinda 1/4 mine 3/4 my girlfriends, (my car ... cars are listed in my sig.). The fuel pump is because eventually we're going do a boosted B16 and there's nothing wrong with too much fuel. The voltage system and the (ha ha hilarious ...), fuel filter are because it does some kinda stutter thing that we, nor anyone we know can figure out ... which is another reason for the engine swap.

Now everyone is probably wondering, "If you're gonna do the swap then why spend the money?" Because a family member of mine has a decent condition CVCC Civic that i'm going to buy from them to put the D series in and kick some ass autocrossing in. So i'm making it as good as I can now.

And thanks for all the other information everyone!

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Fast510

Discussion Starter · #9 · Jan 6, 2007

siregcivic said:
the d15z1 is an alright motor.. im using it with boost.. but im also using a y8 head so i have the regular vtec.. but i wouldnt put a regular vtec head like the z6 or the y8 on the z1 block.. it drops the compression way too low for any streetable na power its about 8.04:1 with a y8 head and 7.8:1 with a z6 head...

what intake manifold are you using right now and what ecu?? i tried using a p28 on my friends vx once.. and it ran like crap.. when i was still na on the complete vx motor i was using a p28 that was chipped with vtec engagement at 4k and i was using the ex trans intake header exhaust.. it ran a 9.93 in the eigth mile.. wich isnt that fast. but thats still mid 15's!!!!

talk to bense or transzex on here.. i think they know where to get the vx cam reground to have some nice lobes.. but either way you WILL NEED A TUNE for that motor to run any better then it does now..

anyways.. gl with your setup and being different:alky:

I'm using a 1991 Si Intake Manifold right now and i'm not sure the ECU. Just the stock one that came with it.

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siregcivic

· #10 · Jan 6, 2007

hmm your not getting a check engine light for the egr valve?? thats usually on the vx mani?..

anyway yea get a ex trans that will make a big difference... you can get a p28 and chip it with vtec at 3500-3800 it will be a little bit quicker if you get a header and exhaust it will make a difference on that motor.. like i said mine ran a 9.93 in the eigth.. my z6 ihe ecu ran a 9.66...

the vx isnt that bad of an engine just.. bad head but it can be made tolerable with little mods

also swap that 91 mani for a 92-95 ex/si z6 mani

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Fast510

Discussion Starter · #11 · Jan 6, 2007

Wow! That is awesome info. man. Thanks!

And yeah, the check engine light does come on kinda sporadically cause there is no EGR but it still runs fine. But i'll definatley switch it for a new one.

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