I am trying to put a dohc zc in my 88 hf and just want to know if I will have to change the wiring harness or what I need to do to make this work.

 

not its all set wiring wise

 

that is good new I read a post saying that you couldn't use the hf wiring harness at all. How do I wire for the cam angle senor?

 

The si/hf wiring harness is the same on the 88-91 models, but you have to use the same hf tranny or you will have to change out you'r hubs.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Contender25 &raquo;</TD></TR><TR><TD CLASS="quote">The si/hf wiring harness is the same on the 88-91 models</TD></TR></TABLE>

sorry, but that's just not true... they are alot alike and are both mpfi harnesses, but not the same...
you will need to use your hf's engine harness and put it on the zc engine.... i was told the hf and si harnesses were the same when i did my first swap and had alot of problems because of it until i just changed back to the hf.... good luck, and if you have any questions you can feel free to e-mail me, i've done this 3 times...

 

O yeah whats so different about them, 1 or 2 wires?, thats not even gonna make a difference probally.

 

get rid of the hf tranny for sure....either go with a si or a zc. You then have to change the hubs but its worth it.

Also if you go with a zc you need different axles. Sometime it will come with an intermediate shaft otherwise you will need that and for the axles get them from a 90-93 integra, cause they are equal length.

 

the wiring in the main plug is completely different, and there is some of the stuff needed for the emissions in the hf that isn't in the si

you could make it work, but you would have to rewire the plug... just using the hf harness is a whole lot easier

 

here's a diagram with the differences

sorry, i don't have what each is at the moment

 

Rewiring the plug is not a problem, i have a HF but the old harness is in pieces and all i been findin is the si harness on ebay, so thanks for the diagram. Thats for the main plug on the passenger side close to the main fuse box under the hood right?, the big fat round one.

 

No wait thats for the plug on the drivers die next to the injector resistor box correct?, i had to take a look real fast, hmm mine aren't matching what it shows on the diagram, thats wierd.

 

Hey you sure that things correct?, i was lookin and everything on my plug next to the injector resistor box is right except for 7 and 8, the light blue is in the red's spot, and the red is in the light blue's spot, i find that kinda strange unless it has something to do with the 88/89 being differen't from the 90/91 models. ?

 

Let me know man, what each one is that is.

 

If you guy would read my sign you wouldnt have tell me to get a different tranny

88 hf with a dx motor si tranny and si manifold, dx brakes, gsr mc, gsr brake booster, and working on dohc zc boosted. Winter project.

 

hey do u have a lay out of an 1991 honda crx zc j spec wireing harness

 

How do you wire in the cam angle senor in to a hf need to asap

 

take the 2 wires that would normally be going to the si dizzy and extend them to the sensor, i think one's blue and one's blue with a stripe, not positive though


that's for the plug by the resistor box by the way

 

Thats what i thought pyro, but my 7 is in 8 and the 8 is in 7, strange. Hf btw so im tryin to figure it out and mess with it, but if i get a si harness is that all i will have to repin?, just makin sure.

 

the picture that pyro posted is for 88 HF (i know, because i made the picture right from my 88 HF harness) the 89-91 HFs are a little different - if you are swapping in a DOHC ZC, there are only 6 wires in the connector that are used - the 4 injector wires (red, brown, yellow and light blue), the black/yellow power wire and the yellow/black which is the injector resistor box power - on the 88 HF chassis harness, the yellow injector wire is at location 4 - the other yellow at location 3 is the HF EGR lift sensor, which isn't used on the ZC - the 88 HF chassis harness has a white/yellow wire for the power instead of the black/yellow on the Si (same thing, just different color) - the dark blue wire in the Si connector location 6 is for the fast idle control valve on 89-91 Si (not on 88 and this is why 88 Si has square 6-wire connector at this location) and is also not needed for the ZC - i have never tried it, but you may be able to repin the Si engine harness to match the 88 HF chassis harness - you may need to also check the connector at the passenger side at the firewall to make sure all the wires match there - at the distributor, you need to replace the round 7-wire connector on the Si/HF engine harness with a square 5-wire connector from the DOHC ZC harness or from a DX - match wire colors on both sides of the connector - you will have 2 wires left over, one blue/green and one blue/yellow - extend these wires and connect them to the green 2-wire connector on the Cylinder Position Sensor on the end of the exhaust camshaft, again matching wire colors on both sides of the connector - if you are using the engine harness that comes on the ZC, it will have a square 6-wire connector at the driver's side firewall and not round 8-wire - DOHC ZC engine harness will plug right into 88 Si chassis harness without changing anything
Jerry
ZCspeed Racing
http://www.ZCspeed.com

 

That still doens't explain if i only have to repin the connector next to the injector box, for the si harness to fit on a hf body.