I keep hearing that some (maybe all) of the 4th gens already have wiring in place for VTEC. Check out this link. I have also heard it some other place, but cant remember where. Can ayone shed some light on this?
Originally posted by preludechic I like your new sig pic, red92s. You're such a sweetheart. I'm glad to see that you're doing good.
the caption is kinda blurry: "voted "best hair" for the Decatur High School yearbook, Sarah's ability to find humor and joyin the worst of circumstances inspired those around her to also be their best". Thats the picture they are using in the yearbook for the best hair award.
So, no one can confirm/deny the existance of this wiring?
I can confirm that my 92 S was not wired for VTEC when I did my swap. However, I know member quikprelude over at hp.com was pre-wired on his 95 SE. So Its possible that the SI's are wired but the S's arent, or maybe its a 93 and after thats wired...wish I had more info for you.
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Dave 92 VTEC
http://lude92.tripod.com/VTECLude
Originally posted by kevie88 I've heard that some 92's are, but after that (93-) they aren't. My 93 S was not wired for VTEC.
I'll walk out to my 92 right now and check if someone can tell me what wires I'm looking for. The dude on hp.com (thread above I posted) said the wiring was taped behind the dash though.
This is from the new writeup on hp.com about the h22 swap:
Quote:
My car wasn't wired for VTEC so I took an old connector that was similar to the ECU one and broke it and took some pins with a few inches of wire and added the pin to the ECU for pins A4 and D6. Then I passed some wire through the firewall, there's a place for that under the fusebox, and I connected the VTEC solenoid to the A4 pin and the oil pressure switch to pin D6 and the other wire of the oil pressure switch should be wired to the ground on the thermostat housing
Are the VTEC solienoid and oil pressure switch the ONLYwires you need to add, because I keep getting different answers.
Vtec switch (one wire, signal to ecu)
Vtec pressure switch (two wires,one signal, one ground)
IAB (intake air bypass) two wires, one +12v, one signal)
Knock sensor (one wire, signal to ecu)
My 'S' model wiring harness was a little too short on almost all the connectors, so I had to do quite a bit of cutting, splicing and soldering. It's not hard at all, just time consuming.
Originally posted by kevie88 For my 'S' model I had to add:
Vtec switch (one wire, signal to ecu)
Vtec pressure switch (two wires,one signal, one ground)
IAB (intake air bypass) two wires, one +12v, one signal)
Knock sensor (one wire, signal to ecu)
My 'S' model wiring harness was a little too short on almost all the connectors, so I had to do quite a bit of cutting, splicing and soldering. It's not hard at all, just time consuming.
So you just added the signal wires (knock, VTEC, oil pressure) to their appropriate locations on the ECU connector? Do you happen to know which pin locations they go to?
Sorry if I am being a dunce here, but if we get this figured out and written up, it can go to the H22 swap FAQ.
Is there a pin diagram in the Helms manual? I ordered one, but havent gotten it yet. . . "A17" dont help much if I dont know which hole it is. I have the B18c giagram, but no H22
If I do the swap this summer, I'll make a little graphic showing the pic locations.
Yep, the service manual has great diagrams, makes everything easy(er)! I PM'd you!
I wanted to add (totally O/T -sorry) that I noticed in the 'engine swap faq' section of the 4th gen FAQ's, someone stated that the engine mounts are different for the 3 different engines that the 4th gen came with. THIS IS INCORRECT!. All engine mounts for 4th gen preludes are the same part number.
Originally posted by kevie88 Yep, the service manual has great diagrams, makes everything easy(er)! I PM'd you!
I wanted to add (totally O/T -sorry) that I noticed in the 'engine swap faq' section of the 4th gen FAQ's, someone stated that the engine mounts are different for the 3 different engines that the 4th gen came with. THIS IS INCORRECT!. All engine mounts for 4th gen preludes are the same part number.
Wow, I think it was P2W that said that. I seem to remember this conversation coming up before, but we never really came to a conclusion as to if they were identical or not. Hmmm....
Yeah the mounts are all the same, as I said before, apparently I was not believed...hehehe.
Anyhow, when people need a visual reference online I send them to http://hybrid.honda-perf.org/tech/info.html for the ECU Pinouts....even though it says its for a civic or a teg, its all the same for the OBDI hondas....
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Dave 92 VTEC
http://lude92.tripod.com/VTECLude
Sorry I forgot you had an S model... yeah I think there's a few more wires for those... when you'll get your Helm take a look in it it'll tell you what wires are NOT in your car so you'll have to add them
Originally posted by Forbidden Sorry I forgot you had an S model... yeah I think there's a few more wires for those... when you'll get your Helm take a look in it it'll tell you what wires are NOT in your car so you'll have to add them
Really? I've never heard that before. I've been hearing that VTEC solenoid, oil pres., IAB, and knock sensor are the only required additions. I can't think of any wires that an H23 HAS that an f22 dosn't, so why would it be different? Also, for the VTEC pressure switch ground, do you just ground it to the chassis, or just splice to the ground for another sensor?
Originally posted by red92s
Really? I've never heard that before. I've been hearing that VTEC solenoid, oil pres., IAB, and knock sensor are the only required additions. I can't think of any wires that an H23 HAS that an f22 dosn't, so why would it be different? Also, for the VTEC pressure switch ground, do you just ground it to the chassis, or just splice to the ground for another sensor?
I didn't need to add IAB and Knock sensor since they were already on the H23, they're the few extra wires you'll need to hook up
For the VTEC switch ground just ground it on any ground, it was so cold when I wired mine that I just took a long enough wire and connected it to the ground in front of the battery it was the easiest place to connect it
Originally posted by Forbidden
I didn't need to add IAB and Knock sensor since they were already on the H23, they're the few extra wires you'll need to hook up
Oh, I see. . .just a little misunderstanding there. So, lemme see if I got this right:
Swapping an H22 into an h23-equipped car, you will need to add:
VTEC solenoid, (signal=Green/Yellow to ECU Pin A4 )
VTEC pressure (oil pressure), (signal=Lt blue to ECU Pin D6 )
VTEC pressure (oil pressure), (ground=Black/Red )
Swapping an H22 into an f22-equipped car, you will need to add:
The wires listed above AND. . .
Knock sensor, (signal=Red/Blue to ECU Pin D3)
IAB, (signal=Pink to ECU pin Pin A17 ), (power=Blk/Yellow to 12v+ switched power source (hot with key in "on" or "start")
Is this correct? Complete?
Of course, from what I'm hearing, you might get lucky and not have to do anything (?)
This information is correct. However, I never wired in the IAB. Since it is basically removed when you add a CAI to your engine. I figured, why add it if I wasnt gonna use it. So I capped off the fitting that it (the vacuum line) plugs into on the intake manifold.
Hope that helps!!
it was the easiest place to connect it 
