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Discussion Starter · #1 ·
Ok guys wondering if anyone could help me with something. i was going to drop some pm7 pistons on my a6 with some other bolt ons but i think i wanna do a head swap z6/y8. Now i have a few questions:

First z6 or y8 cause ive heard the y8 creates very high compression but bolts right on unlike the z6.

Second what do i need to dowith the ecu, get a z6 or y8 or can i keep the a6. Or should i just go with an apexi unit for the vtec and will that run with my a6 ecu.

Third what kinda injectors and fpr should i get.

Last and sorry for so many questions is what about timing will everything flow good after you dial it in with a timing light.

If anyone would could help me that would be great thanks guys.
 

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y8 will create higher compression than the z6 (if memory serves me correctly)

They both bolt onto the a6 block the same way after the oil jet is removed from teh a6 block. The only difference is that the a6 dist will bolt to the y8 head.

Personally, I would swap a z6 head and intake manifold onto your existing block, get a p28 ecu (stock z6) a conversion harness and run it obd1. You will need the z6 dist with this setup as well. You can run your stock injectors if you keep your resistor box or you will have to run obd1 injectors and bypass the resistor boz ala stock obd1 style. Time the engine as you normally would.

Good luck.

PS there are 850 million posts about mini mes floating around the internet. Google pwns thee!
 

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I used a Y8 head, I think it's a better choice. Compression is higher, but with your stock pistons, it's not going to be crazy, you can run fine on pump gas. In general, the Y8 is newer too, and is going to create more power. I agree about converting to OBD1, you can run the Y8 head on a P28, I'm doing it now, and other than plugs, the OBD1 and OBD2 distributors are the same. You'll need to use a conversion or repin the plug anyway. There's no need to change injectors or get a FPR, unless you want to do more mods. You'll need a Y8 dizzy if you go OBD1 as well. If you really want to use the PM6 or AFC, you can keep your A6 dizzy and it will bolt right up, but I would seriously recommend converting to OBD1 and doing it right. You'll also want to get a 4 wire O2 sensor.
If you're ready to start let me know, I just did a Y8 mini-me. I'll have my write up posted soon, I need to get some pics too.
 

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Discussion Starter · #4 ·
Thanks but lets just say cash is not flowing out of my pockets. So if i read you post right i can run obd0 using my a6 dizzy, a6 intake manifold, injectors and use an apexi or fields vafc as a piggyback unit for the vtec to kick in. Is that right? Another what kind of head studs do i need to get a6 or z6/y8 studs? Let me now when you get that post up that would be a great help.
 

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I think its really about the same cost to go obd0 with a vfac or whatever, ot to go obd1. All you need for obd1 is an ecu, a dizzy, and a convertion harness. You can easily get all that for $300, and thats about what you'll pay for the apexi unit as well. Plus then you already have obd1, so when you want to datalog and remap/chip the ecu, you're already a step ahead.
But I'm biased because i'm currently gathering the last of the parts I need to do a y8/obd1 swap.
 

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jmart said:
I think its really about the same cost to go obd0 with a vfac or whatever, ot to go obd1. All you need for obd1 is an ecu, a dizzy, and a convertion harness. You can easily get all that for $300, and thats about what you'll pay for the apexi unit as well. Plus then you already have obd1, so when you want to datalog and remap/chip the ecu, you're already a step ahead.
But I'm biased because i'm currently gathering the last of the parts I need to do a y8/obd1 swap.
That's right. $300 with a new/reman dizzy too. I got my ECU from a yard, with the wires for a conversion harness I made, for 50 bucks. If you do go the Apexi route, you will be unhappy with it eventually, not to mention it's really not the best way to activate VTEC.
For the head studs, get the ones to match the block. I believe all D series studs are the same, except the y8 block, which has shallower threads.
 

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ef8crazy said:
Thanks but lets just say cash is not flowing out of my pockets. So if i read you post right i can run obd0 using my a6 dizzy, a6 intake manifold, injectors and use an apexi or fields vafc as a piggyback unit for the vtec to kick in. Is that right? Another what kind of head studs do i need to get a6 or z6/y8 studs? Let me now when you get that post up that would be a great help.
Don't get the y8 studs. they are too short. My memory isn't so clear about which ones you need but I know.

I'm like 90% sure you need z6 head studs. Don't quote me on that though. Search or god forbid actually call the people who sell them like I did way back in the day.
 

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downest said:
I just did a Y8 mini-me. I'll have my write up posted soon, I need to get some pics too.
What ever happened to that idea? I am trying to make a shopping list of parts I need, and it is hard because I am getting them from different sources... It would be nice to have one all telling guide that I could use.
 

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FooFighter said:
downest said:
I just did a Y8 mini-me. I'll have my write up posted soon, I need to get some pics too.
What ever happened to that idea? I am trying to make a shopping list of parts I need, and it is hard because I am getting them from different sources... It would be nice to have one all telling guide that I could use.
Click
 
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