Arite so heres he deal, im putting a Z6 head on my D15 block and want to convert it to OBD1 w/a P28 and a jumper harness from Rywire, I already converted it to MPFI. How easy is this to do need some help from u guys that have done this or know someone who has. I know i need a OBD1 dizzy which i got w/ the head and a 4 wire O2 sensor....

 

Well you'll need a electronic vss from any 92-95 transmission also. That should pretty much be it.

 

whats he need another vss for, he's not changing the transmission..

you seem to be pretty much on the money. this should help out too
http://crx.honda-perf.org/arti....html
http://crx.honda-perf.org/arti....html

 

But for a p28 to engage vtec it has to read wheel speed. A cable trans is equipped with a mechanical vss. An rpm activate switch is the biggest getto way of engaging vtec, do it right or don't do it at all.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 4GE4YA &raquo;</TD></TR><TR><TD CLASS="quote">But for a p28 to engage vtec it has to read wheel speed.</TD></TR></TABLE>


Anyone confirm this? I've never heard that before. I'm not doubting you but I thought that for VTEC to engage it reads oil pressure. If it has the correct minimum oil pressure at the preset engagement point then the VTEC lobe takes over. I don't even understand why vehicle speed would be a factor.

 

The ecu has to see a number of variables actually, example ect, vss, ops, ckp, vps. Its not just oil pressure.

 

you do not need an electronic vss. I have a mini me swap and I don't have one.

 

Which ECU are you using?

 

i dont have a electric vss and im running a mini with no problem either

 

And which ECU are you running?

 

p28

 

UHG.. so much miss-information... 4GE4YA is wrong about needing to swap the VSS for a mini-me

Here is the deal. The only time you need to change the VSS in an EF to run OBD0 or OBD1 is if you change your dash cluster to a OBD1 or OBD2 cluster, or if you run an obd1 or 2 transmission. You do not need it for a mini-me because you aren't doing either of those things, hopefully.

So, to summarize, if you have an EF(88-91) and are going to OBD1, you can keep your mechanical VSS UNLESS you change your guage cluster for some reason.

The reason for this is simple. in the 88-91, the electrical pulse that is the VSS signal to the ecu is generated in the gauge cluster, which is spun (to generate the electrical signal) by a cable that plugs into the mechanical VSS on the ef transmission. OBD1 and OBD2, the electrical generator that creates the signal is mounted on the transmission instead. When you switch to OBD1 for a mini-me, the cluster still generates the electrical VSS signal from the mechanical VSS installed in the trans.

You may say "well what happens when i use a OBD1/2 transmission that comes with the electric VSS" and to that i say swap the mechanical VSS from your old trans into the new trans, and keep the cable VSS drive into your dash the same.

so, in the case of this guy's mini -me if he is not switching transmissions or guage clusters, he simply needs to plug and play for the VSS.

There are more electrical issues, like the 4 wire 02 that is a necessity, and the wiring for vtec activation, but thats it. If he has already done the mpfi swap, these things should be cake.


Modified by sanimalp at 5:17 PM 6/4/2008

 

head : Z6 SOHC w/dizzy
block : stock D15, fergot the letters after it
tranny : DX so no in know i dont need a electronic VSS
IM : Si w/ 450cc dsm injectors
ECU : P28 oh yah quick ? a PM6 hooked up w/ a VAFC II is just the same as a P28 just OB0 correct


other notes : Resistor box still stays?, neone have the instructions for wiring up VTEC?,

 

resistor box stays with the DSM 450's. You might want to check the block to make sure it isnt a D15b6, cause your plan wont work with the stock pistons.

a PM6 with VAFC does not a p28 make.. read up..


Modified by sanimalp at 11:21 AM 6/5/2008

 

To be more specific, the B6 block would work, it's the matching pistons that won't work. And yeah, PM6/VAFC doesn't = P28.

 

its the stock DX canada model...

 

so basically ur sayin hookin up a VAFC 2 a ECU sux pretty much

 

yes.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sanimalp &raquo;</TD></TR><TR><TD CLASS="quote">UHG.. so much miss-information... 4GE4YA is wrong about needing to swap the VSS for a mini-me

Here is the deal. The only time you need to change the VSS in an EF to run OBD0 or OBD1 is if you change your dash cluster to a OBD1 or OBD2 cluster, or if you run an obd1 or 2 transmission. You do not need it for a mini-me because you aren't doing either of those things, hopefully.

So, to summarize, if you have an EF(88-91) and are going to OBD1, you can keep your mechanical VSS UNLESS you change your guage cluster for some reason.

The reason for this is simple. in the 88-91, the electrical pulse that is the VSS signal to the ecu is generated in the gauge cluster, which is spun (to generate the electrical signal) by a cable that plugs into the mechanical VSS on the ef transmission. OBD1 and OBD2, the electrical generator that creates the signal is mounted on the transmission instead. When you switch to OBD1 for a mini-me, the cluster still generates the electrical VSS signal from the mechanical VSS installed in the trans.

You may say "well what happens when i use a OBD1/2 transmission that comes with the electric VSS" and to that i say swap the mechanical VSS from your old trans into the new trans, and keep the cable VSS drive into your dash the same.

so, in the case of this guy's mini -me if he is not switching transmissions or guage clusters, he simply needs to plug and play for the VSS.

There are more electrical issues, like the 4 wire 02 that is a necessity, and the wiring for vtec activation, but thats it. If he has already done the mpfi swap, these things should be cake.


Modified by sanimalp at 5:17 PM 6/4/2008</TD></TR></TABLE>

well put. yes vtec works off of oil pressure not wheel speed. whats this world coming to. might as well check your blinker fluid while figuring out the vss.

 

thanx fella's