D series rebuild or swap [Archive]

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MrBlue

07-13-2006, 05:30 PM

I need Ur help, I have tried to look through these threads and it bewilders me on which is the best. Here is my story.....my son has a 91 CRX with the D15 B2 block & 16v head, & Duel Point PGM-FI fuel system. What the Hell would U do with this? It smokes real bad right now and needs to be shot, swaped or rebuilt. We are members of the SCCA and race almost every weekend, i run a 99 prelude with an H22A Vtec and he is trying like hell to keep up with me. I want his CRX to be competitive and kick my ass. I already swapped the rear drum brakes for Disk off of an 92 Acura. We will lower it after we build the motor. Talk to me!!!! I love the way the car handles, we have been on open road coarses and it is great expect for the horse power. Would U dump the 16V head for a VTEC? put the 16V head on a D16? Rebuild the D15 to 12:1 Compression (i plan on Turboing it later). I run a 99 Prelude with the H22A VTEC. I love the Power it has. Let me know please. Thanks, Blue

Dweezil

07-13-2006, 06:32 PM

Get a D16A6 and swap it in. Also do a MPFI swap and get the Si tranny to go with it and you'll be set for now. Later if you want to turbo it you have some of the work out of the way. You could also use a D16Y7 and swap that to OBD-0

Black91CRXsi

07-13-2006, 07:15 PM

If it didnt go against any class rules in SCCA, you could go one step better and drop in a DOHC ZC. ZC 130hp > D15B2 92hp for less than $1000 for the entire swap.
The cheapest option would be a VTEC head swap. Either a Z6 or Y8.
But there would be even more wiring issues involved. I'd go with the ZC!
Whichever you choose, Good Luck!!!

-Colin

MrBlue

07-13-2006, 08:40 PM

Bump, Good Replys so far. Anyone else?

goomer416

07-13-2006, 08:58 PM

depends on how much money you are willing to put into the car... or how much work your willing to put into it... i am swapping in a z6 into my dx and i found that they r easy to find (thx to the b16 swaps ppl r doing :P) so you could get a desent milaged z6 for realy cheap then ur also running mpfi rather then ur dpfi

Clutchmaster

07-13-2006, 09:09 PM

yeah i'd opt for the head swap

slowpoke-eg8

07-14-2006, 02:12 AM

either way, an MPFI swap is in order, no way about it. go ahead and do it now, thats a quick 10hp at _least_, and you might as well use a Y8 ("d-series type-r") intake manifold to further the gains.
and if you plan on turboing, you should swap in a D16 of some sort, the bottom end is stronger, and the aftermarket more readily supports them (e.g. high performance connecting rods).

MrBlue

07-14-2006, 08:07 AM

94EXa2

07-14-2006, 09:44 AM

not that big a fan of the dohc zc, seems as tho ppl like it just cuz its dohc.........personaly id swap in a z6 (strong motors) ex/si tranny and start from there.......with a lil boost he should hang with your h22:haha:

Crx vtec SOHCt

07-14-2006, 10:51 AM

My CRX with a D16y8 boosting, tuned, DSM turbo on 11 psi......Ran a 13.2 on street tires...

Infamous

07-14-2006, 02:32 PM

i put my money on a CRX with a sohc vtec motor over a Prelude any day. Power to weight ratio. JDM D15B they can be had for very cheap.

ddd4114

07-14-2006, 09:28 PM

z6 or y8 swap would get my vote. A turbo'd d16 would give your Prelude a hard time.

What is your budget for this?

Black91CRXsi

07-16-2006, 06:00 AM

Great Info.... What cars do the ZC motors come out of? What Changes will i have to make i.e. ECU, Tranny, shifter, wiring.....? There is probably a thread out there already on this. The D15 i have is smoking real bad and needs to be rebuilt, it sounds like it would be smarter and cheaper to go with the ZC swap. Any one have a built ZC for sale?

Dohc ZC's came out of JDM/EDM 88-91 Civic/CRX Si's. The only things you would have to do is the MPFI swap since you have a DX. And this: http://rywire.com/store/dohc-distributor-adapter-p-30.html?osCsid=b08cfebb3f25f1006b5dadd0ca45dc88. The ZC bolts right in. No need for different mounts. Plus you can use the tranny and shifter you already have.

MrBlue

08-12-2006, 07:01 AM

Thanks for all the info; i went with the JDM D15BZ6. I am in the middle of swapping everything over. I need to find out how to do the MPFI swap. I am going to look for the info, but if U know please reply. Also need to find the OBD0 to OBD1 distributor conversion info. There is two blue wires on the OBD1 distributor that is not in my originial harness; where do they go.

imlost

08-12-2006, 07:22 AM

i found this...
http://www.50mod.com/fourthgenhatch/mpfi.html

hope it helps.

Black91CRXsi

08-12-2006, 07:48 AM

MrBlue

08-12-2006, 08:12 AM

I found the info. going to go wire it up right now.

MrBlue

08-12-2006, 08:13 AM

http://www.ef-honda.com/ben/
Go to tech on the right hand side and look up MPFI and Vtec wiring under Engine catagory. Good luck.

Thanks,

remoer

08-12-2006, 08:43 AM

My CRX with a D16y8 boosting, tuned, DSM turbo on 11 psi......Ran a 13.2 on street tires...
if you run w/a turbo it would put him in a different class which he won't run w/him.

now i've been doing some research in getting into road coursing. this is the set-up i'm building for my 90 crx:

d16a6 block (rebuilded and balanced)
pm7 pistons
d16y8 thin head gasket(i should have close to 12:1 compression)
d15b7 head mildly port and polish
272 regrinded delta cam
d16z6 intake manni
GSR 60mm throttle body
crx si tranny
35mm Quaife LSD (from king motorsports which should be around dec i get it)
converting it from ODB0-ODB1 so i can used crome pro
i do want to used cbr929rr itb, so i can used crome pro. i own cbr600rr but i was told they would choke my engine due to the work i'm doing.

i want to start doing this shit if it stop being so fucking hot in atlant. lol. but in truth i was told that all i would be is a moving road block. lol. i just want to be able to keep up with other crx and cars in my class, nothing more.

Hellhatch

08-12-2006, 10:00 AM

Head swap and si tranny.

MrBlue

08-14-2006, 12:32 PM

Here is whats up so far..... engine is in had to swap the front engine mount & exhaust manifolds. I wish i would have thought about depining the OBD0 distro connector and inserting them into the OBD1 connector instead of cutting and soldering. Ran 2 wires for the injectors and 2 for crank position sensor in the distro. Wired up my ECU conversion harness. I dont need the resitor box because i am running OBD1 injectors. My issue right now is how to wire up the grounds (yellow w/blk) for the injectors. The original DPFI has only two ground (yellow w/blk). I soldered 2 of the injectors to each of the existing grounds. Is this right?? i havnt heard back yet from anyone on this.

goomer416

08-22-2006, 04:03 PM

This is the instructions i fallowed, but basically what u did it the same...
from - http://www.geocities.com/kurtsi_on/page8.html

1. The injection resistor must be removed from the circuit. This is because the OBD0 injectors are not compatible with the OBD1 ECU. In order to do this, the yel/blk wire from the green plug on the injection resistor must be pulled. It will be relocated into an open space in a gray 8 wire plug from the OBD1 harness. This OBD1 plug has 8 yel/blk wires leading out from it and has a gray cap on it. Removal of the cap shows that it has an integrated metal clip that connects all the yel/blk wires together.

2. Injector wiring. To use the OBD1 injectors, the injector plugs from the OBD1 harness must be used. Each plug has a different color line (brown, red, light blue and plain yellow…1,2,3,4 injectors respectively) and a yel/blk wire leading from it. The yel/blk wire from each of the injector plugs leads back to the 8 wire plug mentioned in #1. The OBD0 injector plugs must be cut off and the OBD1 injector plugs soldered on. Match the injector colors to each other, as they are the same on both the OBD0 and OBD1 harness. Note: On the OBD0 harness, the wire leading from the injector plug to the injector resistor is red/blk. These wires need not be worried about as they only connects the OBD0 injector plug to the injector resistor.