mini-me conversion help

[1996ek1]

Hey i've been searching for answers, over different forums, and there are just a few different things i cant find the answer to. I have a D16Y4 and planning to swap to a Y8 head.

1. Will my Y4 intake manifold fit the Y8 ?
2. Will the Y8 fit dirrectly to the Y4 block, or require modification ?
3. Is the VTEC solenoid part of the head, or seperate ?
4. Can i re-wire my Y4 ECU, to use VTEC or do i require a different ECU ?


Thanks

[turtleEK1]

Hey i've been searching for answers, over different forums, and there are just a few different things i cant find the answer to. I have a D16Y4 and planning to swap to a Y8 head.

1. Will my Y4 intake manifold fit the Y8 ?
2. Will the Y8 fit dirrectly to the Y4 block, or require modification ?
3. Is the VTEC solenoid part of the head, or seperate ?
4. Can i re-wire my Y4 ECU, to use VTEC or do i require a different ECU ?


Thanks

1. Yes... will bolt right up
2. Yes... will fit directly on... I recall something about a oil gallery modification when doing it??? Something to do with the oil pressure to engage vtec.
3. Yes... vtec solenoid is part of the head
4. No... you cannot use the y4 ecu. Its not equiped with the vtec components. Try looking through this forum a little more. I think it has been covered a few times on here! If any doubt, try d-series.org. Have plenty of mini-me work there but is mainly US based...

[Boban]

As above
4. you will need a P28 ECU, try a wrecker somewheres, also you will need to do some rewiring to your harness to make it all work.

Really good DIY: http://www.jdmuniverse.com/forums/view.php?pg=minime

[Edgeauto]

I now have harnesses for this conversion. You can use the OBD2b harness with the OBD2b P28 ECU as recommended above.

[1996ek1]

I now have harnesses for this conversion. You can use the OBD2b harness with the OBD2b P28 ECU as recommended above.

Thanks for all your help guys, i've tried looking but its normally Y7's that have the full conversion including ECU info. When ever i found the Y4 conversion they never mention the ECU.

Just a few more things;

Is the OBD2b P28 ECU & harness from a: 92-95 OBD-1 Civic Si/Ex ?
And do you know roughly how much that will cost ?
Is that what a wiring harness adapter is used for ?


As above
4. you will need a P28 ECU, try a wrecker somewheres, also you will need to do some rewiring to your harness to make it all work.

Really good DIY: http://www.jdmuniverse.com/forums/view.php?pg=minime

I've seen that thread before, but again its for a Y7

Thanks

[kraiye]

a y7 is basically a y4 with a shitty US intake and minus the annoying aus ecu.
aside from the P28 ecu, you can also use a P2P ecu. are a couple minor drawbacks but there's work-arounds for those :thumbsup:
i'm having a go at the wiring myself but it's not looking too good right now! lol
I've been prepping for a minime for... well seems like forever but now I might be getting a different car.
will keep ya posted if i do cause then i'll have a y8 head and a cheap turbo kit up for grabs :)

[1996ek1]

a y7 is basically a y4 with a shitty US intake and minus the annoying aus ecu.
aside from the P28 ecu, you can also use a P2P ecu. are a couple minor drawbacks but there's work-arounds for those :thumbsup:
i'm having a go at the wiring myself but it's not looking too good right now! lol
I've been prepping for a minime for... well seems like forever but now I might be getting a different car.
will keep ya posted if i do cause then i'll have a y8 head and a cheap turbo kit up for grabs :)

Yea i was going to try the wiring myself ;)
hope it works out. I just need to know from which car do i find the P28 now.

And if you are going to sell your y8 head i would love to buy it, so please keep me informed. Thanks !!:thumbsup:

[Boban]

I'm not 100% sure, but i'd guess you'll need one out of either ek vti or a ej8 (ek coupe). I don't think eg vti would fit because it's OBDI.

They're roughly about $160-$200 if you can find one. And if you find more than one, please let me know because i can't find one :)

[1996ek1]

I'm not 100% sure, but i'd guess you'll need one out of either ek vti or a ej8 (ek coupe). I don't think eg vti would fit because it's OBDI.

They're roughly about $160-$200 if you can find one. And if you find more than one, please let me know because i can't find one :)

Lol, i'll let you know if i find 2 ;)
( but that makes it sound like im going to struggle to find 1 )

[Boban]

maybe, or maybe i'm just lazy and haven't looked hard enough :p
I need one out of an eg and that's being a b!tch to find at a reasonable price

[1996ek1]

maybe, or maybe i'm just lazy and haven't looked hard enough :p
I need one out of an eg and that's being a b!tch to find at a reasonable price

Oh lol. This is getting more and more confusing as a read more.

Do i need to rewire some stuff, + get a new wiring harness, or just 1 or the other??:confused:

[Boban]

sorry man for confusing you. You can use your existing harness and add wires for the Vtec solenoid and for something else (something to do with oil pressure or something) to your stock harness. BUT if you are lazy or not sure what to do or can't get mates to do it for you, Edgeauto sells harnesses already pre made to make our lives easier :p makes sense?????

PM Paul (honda_be_blastin) and he'll tell you exactly what to do, he's done a few conversions

[1996ek1]

thanks again mate ;)

and can you tell me one more thing? =) ( I've searched the forums, can't find an answer =\ )

Which harness do i have atm? is it an OBD2?

Thanks in advance

[Boban]

yeah man i'm pretty sure you got the obd2

[SirEk1]

i wanna do a mini me conversion also. but this is confusing lol.

would there be any shops that would supply and fit all of it??

[kraiye]

probly but it wouldn't be worth the $$$

[Phuong1987]

You can use d16y1 as well. Im pretty sure y1 is stronger then Y8

[nd55]

[Warning: internet mechanic in the area]

I'm going on memory here, so forgive me any mistakes, please.


D16y4 vs y8, y5, y7:

Y8 has decent 4-2-1 headers, y4 has small cast 4-1 manifold, y7 has awful cast log manifold with.

American D16y5 has an awful cast log exhasut manifold. Not sure on power figures for US D16y5.

Y8 (130Hp) 98Kw.
Y5 96kW.
Y4 (Aus GLi spec) 88kw - Not much in it.
Y7 (100Hp) 75kW, this is why Americans do the mini-me.

D16y8 has high/low vtec cams on intake only.
D16y5 has only a single cam profile on intake and exhaust.
Only one valve is active up to 3000rpm, when 'vtec' kicks in and both intake valves run at the same time.
D16y4 + y7 single profile cams. period.

American D16y5 ran a wideband O2 sensor, and very lean tuning which
allowed it to set some impressive milage figures. Not sure about local version.

D16Y5 runs EGR, so manifold looks similar to D16y8 but has an extra passage.

D16y8 arrived locally in the coupe body. This why it is comparatively rare.
D16y5 shipped in the EK VTi which was almost $30K 10 yrs ago.
Australians' habit of running cars for longer and the high price of the VTi
explains why its not exactly a common junkyard piece.

D16y8 gearboxes have better (lower) gear ratios, with 40mm axle bearings.
The lower gear ratios are the best feature of the d16y8 IMHO and the 40mm
axle bearings allow the fitment of aftermarket LSD's.

Wiring issues.
The local D16Y4 (CX and GLi spec EK) uses two wires for the fuel injectors and
has no vtec wire.

Also, if choosing to run OBD1, obd1 motors have the crank angle sensor in the dizzy, whereas OBD2 legislates it be on the crank.

Your current ecu cannot activate the vtec function, so you will need to change it.
EIther a ecu out of a d16y8 car or a reprogrammed obd1 ecu.

D16y8 ecu doesn't just plug in to your existing car as they use a
completely different ecu plug and slightly different wiring loom.

an OBD1 conversion allows you to use your existing loom + a wiring harness adapter + some extra mods.

Its an awful mess, six of one, half a dozen of the other.

D16y4 (Aus specific plug), D16y8 (Obd2a, b) and obd1 ecu's all have a
different ecu plug and wiring loom.

Edgeauto has a ready to go solution, if you're gonna run a obd1 conversion, his might be a cost effective solution.

The blocks are all similar, when converting a non vtec block to a vtec block there's a plug on the block surface which need to be removed to allow oil to flow
into the head to activate vtec.

D16y8 runs a knock sensor. If you run a d16 vtec ecu without the sensor, you'll
get an ecu error code. Not sure if this prohibits vtec activation.

Hope I got some information across.
Nick.

PS> IMHO not enough in to be worthwhile. LSD and light flywheel!!!!!

[redefine]

i was thinking, could you possibly run a switch to the dash or something connecting 12v to the vtec solenoid, rather then having the ecu? i guess its not good, cause then you dont have any of the vtec specific controlls (i dont know what they are, but i assume the ecu has them).

[kraiye]

in short... yes
extremely impractical though
for track i guess it would be ok as long as you dont fall out a vtec rev range, otherwise you'd be flickin the switch on and off for best performance
for drag you'd be better off with a button on the steering wheel - like they use for NoS

[redefine]

i think i'm gonna do the mini me when i get cash.

couple more q's,
do the stock y4 headers bolt on to y8 head, like the intake manifold?
i read somewhere for the D15 mini-me you could swap out the pistons for ZC ones, and gain a bit of compression, is there a similar thing for the D16?

[VTec1987]

i think i'm gonna do the mini me when i get cash.

couple more q's,
do the stock y4 headers bolt on to y8 head, like the intake manifold?
i read somewhere for the D15 mini-me you could swap out the pistons for ZC ones, and gain a bit of compression, is there a similar thing for the D16?

yeh the y4 headers will bolt on the y8 head

[Webby_roller]

[Warning: internet mechanic in the area]

Not sure on power figures for US D16y5.


D16y5 has only a single cam profile on intake and exhaust.
Only one valve is active up to 3000rpm, when 'vtec' kicks in and both intake valves run at the same time.
American D16y5 ran a wideband O2 sensor, and very lean tuning which
allowed it to set some impressive milage figures. Not sure about local version.

D16Y5 runs EGR, so manifold looks similar to D16y8 but has an extra passage.


Hey, another name for the engine, I belive in America is the D15Z1. It is also known as Vtec-E. Power is 80-90hp i think from memory.

IT does run the wideband O2 sensor, and at cruising should run A/f of (from readings) 20:1.

The local version is delivered in the EG VEi.. I think... cant remember too much atm, too much vodka lol... anyways, hope this helps