Accord_Munch

Hey peeps,

I just had a friend help install the VAFC in my 97 EX, everything is just about working .. except I have no VTEC (Man .. does it suck!) I know that the blue VTM wire from the VAFC needs to be hooked up somewhere .. could someone please tell me what wire it is hooked into on the ECU???? PEEEERRRTTYYY Please .. thanks!

AggAccord03

it hooks to the ECU side of the VTM signal wire in the H2-a wiring diagram from Apex`i's web site. just cut that wire in the middle some where and tape off the car side and connect the vafc to the ecu side of that wire. I don't know the color of the wire on the ECU - I can look tonight maybe. I know mine did the same thing and once I hooked that up it worked great!

You'll love the VAFC. I got mine tuned and made 6 whp.

e-mail me if you need any other help. gigemaggies03@hotmail.com

Later

Accord_Munch

Please do tell me ... the H2a wire diagram is wrong ... we ended up using the H6-a diagram .. since it matched my ECU ... (3 rows of ecu wires .. while H2-a only has 2)

perrty perrrty please I want to dyno tune the car today .. but I don't have the vtec hooked up yet.

Accord_Munch

It would be even better if you could tell me what wires you have hooked up with what wires ...

Thanks!

Stew Pidasso

Set your crossover at 3500 and you're good to go.

Accord_Munch

Thing is .. my vtec is not engaging . right now the low is set at 4800 and the hi is set at 5200 .. when I get up in that range .. my car still accelerates . .but I don't feel the "kick". so I know something isn't hooked up right. Is your blue VTM wire hooked up?

Stew Pidasso

Yes the blue VTM wire is hooked up. Refer to the second page of this post for the wiring info... https://honda-tech.com/zerothread?id=157504

Notice I was learning myself in this post. Set your VTEC to a lower crossover like 3500 and you get a **** eatin grin

Accord_Munch

Well I just read the post, according to it, the Blue wire is not used? Now I am confused .. I read it from this.

OK. All of these will be looking at the wires with the connectors in the
> ecu. The top will be the part with the push tab.
>
> The Red and orange both go to the yel/blk wire on the 32 P connector #11 top
> right corner.
>
> The Blk and Brn both go to the Blk wire just to the left of the #11 above.
> Note the Brn wire needs to be closer to the ECU.
>
> The Grn wire goes to the 32P connector Yel/Grn Wire #20. This is down one
> row and left 3 columns. It should be the one with nothing in the row above
> it (an empty spot).
>
> The grey wire goes to the 16P connector (the smallest) Red/Blk wire. In the
> top row all the way to the left.
>
> The Blue wire is not used
>
> The pink wire goes on the car side of the cut 32P connector #8 Grn/Yel wire.
> Its the wire two to the left of the Blk wire for the ground. The Purple
> wire goes on the ecu side of the same wire. Make sure they dont connect
> bypassing the VAFC.
>
> The White wire goes on the car side of the cut MAP sensor wire. This is on
> the 16P connector white/yellow wire two wires to the left of the Throttle
> Positioning Wire. The ecu side of the cut wire should get the yellow wire
> from the VAFC.

Accord_Munch

Well I guess I will check the wires over at lunch

Accord_Munch

Guys, it turns out it was my vtec engagement point. It works now ... but .. according to the instructions I read off of here, the two ground wires are plugged into the black wire off of the ECU. Mine are plugged into the brown wire. Yet things seem to be working fine.
weird.

Stew Pidasso

Oh well too late. I believe the blue VTM signal wire goes to the blue wire with the black stripe on the ecu side.

niedejb

I didnt use the VTM. The 94-97 ex's (f22b1) dont have em.

AggAccord03

Ok now ya'll are freaking me out about my VAFC install. I also hooked my grounds to the brown wire instead of the black one like you did, but my VTEC did not work until I hooked the VTM wire to the blue/black wire (not positive - it's too freaking cold out there to go mess with it). But 2 of ya'll are saying that the VTM wire is not used.

Niedejb - I used the directions that you gave me when I installed mine, but your wires and locations were TOTALLY different from mine. are you SURE the ECU is the same on the Honda and the Acura?

Also, when you say cross over you mean the vtec engagement LO >> HI setting right? I have mine at 3,500 and HI >> LO at 3,200. Power band was smooth on the dyno, so I left it there.

What are your fuel settings? They leaned mine out in the low end but left it at 0 in the upper RPMS. Like a 3,000 - I think my WOT fuel setting is like -9! Anyone else had theirs actually tuned?

Thanks.

Stew Pidasso

I definitely used the blue VTM wire and it's on a 94 Accord EX F22B1. My VTEC didn't work until that wire was hooked up.

AggAccord03

yeah...same here, but some people are not using theirs and their vtec works? Are they just letting the ECU handle it and not adjusting it? or are they just crazy?

haha

accordexchange

did you set your VTEC settings to 3500...??did you set your VTEC settings to 3500...?? cause i think your vtec is kicking in way too late... like about 5200 rpms or so... that's why you're not feeling the kick... also go to the "monitor" feature to see if the vtec kicks on... rev till you see the vtec turns on and you'll see which rpms the vtec is kicking in... there's lo vtec and hi vtec like aggaccord03 said... make the sure hi vtec is 3500 i think... so for the "monitor" feature, you'll have the option to view the lo vtec, hi vtec, or both... cause only one kicks on for accords... my buddy with integra gsr is able to mess with th lo and hi vtec...

niedejb

Yes

Accord_Munch

Okay guys, the blue VTM wire .. I don't have it hooked up to anything. Now I have 97 .. so I have ODBII so I don't know if that makes a difference or not. But the brown and black (ground wires) I have hooked up to the brown wire. Things are working fine, I went and dyno tuned my car yesterday. Check these numbers out.

I did a baseline run in October minus some mods I have now. I was putting down.

129.2 HP
132.6 TQ

Which figures out to around 152 HP and 156 TQ .. not bad considering stock is 145/147.

After the dyno tune yesterday (did 21 runs total)

I am now putting down
139.97 HP
140.61 TQ

Which figures out to 164.7/165.5 ... swweeeeeeet.

And ... my vtec is set as low as it can go ... 3200-3100

ArchAngel Sabastian

sigh.. if you dont have the blue VTM wire hooked up your not influencing the vtec engagement point.

setup the vafc for vtec at 5k if you can rev past 4k and not noticed 0 for power then the vafc isnt hooked up right. if you set it at 5k and you rev past 4 and you get **** for power cuz your running on one valve it is hooked up right and i would suggest setting it for a lo<hi 3500 hi<lo 3300.


edit: all tho the initial factory spec xover is actually sometimes lower than 3500 lower isnt always better and you will make the best power across the band with a 3500 xover.



[Modified by ArchAngel Sabastian, 8:46 AM 12/5/2002]

ArchAngel Sabastian

those two wires have to be installed one closer to the ecu than the other you took that into account right?

Accord_Munch

I am not saying that you are not right, but I would have to disagree with you ... I had my cross-over point set at 3500 .. and according to the dyno I had a dip and spike. Setting it down to 3200-3100 smooth out the whole entire curve. I will print some of them out tonight hopefully and scan them in .. so I can show you guys.

Stew Pidasso

I used my VTM wire and Mine definitely kick in at 3500rpms. My little VTo indicator says on at 3500 accompanied by an definite increase in accelleration and power. Set up your VAFC so you can monitor 4 things. Then set those 4 things to monitor, Intake MAP, RPM, VTEC engagement and Throttle position. It will tell you exactly when VTEC engages and you should be able to feel it.

Accord_Munch

You are correct ... one wire is closer to the ECU .. I believe the black one is .. I can't remember.

ArchAngel Sabastian

vtec xover is nothing without proper fuel compensation

Accord_Munch

You are correct, which is a good thing the dyno has a wide band O2 sensor .. the fuel was adjusted ... which is why I had 21 some odd runs last night. The last 6 or so runs was getting the a/f points set right accross the low and the high.