What does it take to wake up the m20b27 "e" motor?

[Cabriolet]

the 731 head is the euro b20 head. so you get higher compression. but the ports need to be opened up to the 885 size to get power out of it. the 885 will lower your compression to 8.5:1(using eta lowers)

[VinniE30]

I have an eta which is internally stock. Only mods are "i" bolt-on parts, chip and differential.
It's slightly faster than a chipped m42 e30. (highway pull)

[ANDRÜ]

I had a bavauto chip in my 87 eta, made a night and day difference.

[shaferbm]

the 731 head is the euro b20 head. so you get higher compression. but the ports need to be opened up to the 885 size to get power out of it. the 885 will lower your compression to 8.5:1(using eta lowers)

So with just an 885 head and normal eta bottom end does the lower compression affect power at all?

[Cabriolet]

So with just an 885 head and normal eta bottom end does the lower compression affect power at all?

a little, yes. unless you get custom pistons. or turbo

[shaferbm]

I guess it looks like a 731 head would be the way to go. Is the 7k redline possible with the 731 head and i components?

[cheapshot]

I cannot comment directly to the performance of the 885 as I have not driven a car with this set up. I can tell you that had I not found the 731 head I would have went that direction, shaved the head and block and ran a thinner gasket. A CR of 8.5:1 is not bad at all. I do think that is very optimistic without doing the above. With the 731 head, I should retain my 9:1 CR. One of the advantages to running the higher CR is the ability to get more out of a more aggressive cam profile. Also, to your 173 dme question, you will absolutely need to upgrade to motronic 1.3 to realize the benefits of this setup. However, you can also purchase a chip from Mark D for around 300 that will work with your 027 dme with these modifications, thus not having to swap out the wiring harness and ascociated sensors. That is the route I am going for now.

[cheapshot]

I guess it looks like a 731 head would be the way to go. Is the 7k redline possible with the 731 head and i components?

Absolutely.

[shaferbm]

Absolutely.

Can similar benefits be had with the markD chip and 027 dme? (I'm assuming 027 dme is the factory e ecu) Sorry to bombard with questions just trying to learn.

[cheapshot]

Can similar benefits be had with the markD chip and 027 dme? (I'm assuming 027 dme is the factory e ecu) Sorry to bombard with questions just trying to learn.

I had a long conversation with Mark about this before I decided to go this route. R3v limit will be the same but the ecu used in the 027 dme will not store as much as the ecu in the 1.3 dme. Does that make sense? Kinda like a thumb drive with different storage amounts. Because of this the tune isn't quite as complex and you lose 2-3 hp at the peak. Keep in mind this is the chipped 027 vs. the chipped 173. You have to buy a chip not matter what to compare the two. In my opinion, its worth it to me to not have to deal with the wiring aspect of the motronic swap. Every time I have done a project like this, I always hit a wall when it comes time to do the wiring. It's not my cup of tea.
I do however want to make it clear that I am not saying this is the best/only way of doing it, all things aside, I would have done the motronic swap had I the resources and time. But this is my DD and I cant risk running into a wiring hiccup.

[Wanganstyle]

I guess it looks like a 731 head would be the way to go. Is the 7k redline possible with the 731 head and i components?

Why not? people r3v the m20b25 "i" engines until rocker explosion. a properly built and balanced 2,700-3,100cc bottom end m20 should have no issues with 7,000 rpm.

[shaferbm]

I don't think I'll be rebuilding my bottom end if I don't need to (at least while this car is still in dd land). I'll assume the stock internals are properly built. Cheapshot, I have been reading your 731 head build thread and am appreciating it's wealth of info.

I'll be sure to call him later, but does markD have aseparate eta chip and 2.7i chip or are they the same thing? Because I don't want to put a chip in there that will let it rev to 7k with the factory eta head that can't handle it.

[reelizmpro]

Chip and I cam are two major mods. Then I head, intake, etc.

[cheapshot]

I'll be sure to call him later, but does markD have aseparate eta chip and 2.7i chip or are they the same thing? Because I don't want to put a chip in there that will let it rev to 7k with the factory eta head that can't handle it.

Yes, they are two different chips. If you are planning on going with the head swap, I would suggest picking up an eta chip in the interim for the stock motor. The 2.7i chip was dyno tuned specifically for the 731 head swap. I think the redline on the eta chip is around 5400 and on the 2.7i chip around 6200 but don't hold me to this. Mark is digging up his old dyno sheets and specs on the chip and sending them to me. PM me your email address and I will forward the information to you once I receive it.

[MarkD]

I'll be sure to call him later, but does markD have aseparate eta chip and 2.7i chip or are they the same thing? Because I don't want to put a chip in there that will let it rev to 7k with the factory eta head that can't handle it.

Yes I have separate chips for a stock eta motor and the eta motor with 'i' cams.

I've sold a few in the last few years and people love them.

I'll post again here with more details in a few days.

MarkD