Eta 2.7 block with is 885 head question

[Andy.B]

It sounds like I need to swap out my i manifold for an eta manifold on my 2.7i.
I'm running a 230k eta bottom end, bimmerheads 274 cam, motronic 1.3, and full i exhaust. It already drives fantastic. If I can make even more power by simply swapping in an eta manifold, then I am absolutely going to do it.

[mikebloco]

So the eta intake on a franken 2.7i motor flows more than the i intake!?!?!? Even after 4,000 rpms???? I would ASSume it would just flow better down low

[modernist]

It's a very strong combination. You get more TQ than an eta, but the better breathing of the head and cam, so more HP to boot. It does choke a bit at the top end, drops off pretty rapidly at 6000 or so.

Do you still have the graph lying around? Here's a quickie graph of mine I made today (no idea how accurate the numbers are, it's an app that uses the accelerometer on my phone along with weight, gearing, aerodynamics, weather ...) but it illustrates the torque characteristics nicely. How is it different with the eta manifold?

[mikebloco]

The tq is definitely much nicer than just a b25

[mikebloco]

Bump. I need to know more about this

[digger]

I'd be tempted to work on an eta head given the engine likes the small runner Intake manifold, on a engine that is sub 200bhp that is

[jayuuey]

So the eta intake on a franken 2.7i motor flows more than the i intake!?!?!? Even after 4,000 rpms???? I would ASSume it would just flow better down low

subscribed.. waiting for confirmation on this.

[djjerme]

I am kinda curious about this as well.

I have 88 Super Eta I picked up from auction this month, and we were thinking of swapping one of my extra i intakes/TB/AFM/ECU/injectors on it.. Would like to see flow numbers or some sort of solid evidence.

[ForcedFirebird]

subscribed.. waiting for confirmation on this.

I am kinda curious about this as well.

I have 88 Super Eta I picked up from auction this month, and we were thinking of swapping one of my extra i intakes/TB/AFM/ECU/injectors on it.. Would like to see flow numbers or some sort of solid evidence.

If you click my link above, we posted flow numbers for the eta, seta and i top ends.

No, the eta manifold does not flow better, but coupled with the 2.7i (flat pistons/885 head, eta manifold ported to accept the "i" throttle body), it gives more torque and power than a "i" manifold - but also, power drops more rapidly after 6000rpm than the "i" manifold on a 2.7i.

[ForcedFirebird]

Do you still have the graph lying around? Here's a quickie graph of mine I made today (no idea how accurate the numbers are, it's an app that uses the accelerometer on my phone along with weight, gearing, aerodynamics, weather ...) but it illustrates the torque characteristics nicely. How is it different with the eta manifold?

I have the WinPEP files from the dyno on my SD card - in which I left at the dyno during the last tuning session - won't get it back until I go back to tune another car, or am on that side of town.

[modernist]

I have the WinPEP files from the dyno on my SD card - in which I left at the dyno during the last tuning session - won't get it back until I go back to tune another car, or am on that side of town.

Looking forward to it

[4x4_e30]

Extrude honing might be worth a shot.

[mikebloco]

I'm in the middle of a 2.7i build right now and I never really take my car past 6k rpms any ways. I have a eta intake and an i intake so I might give this a shot.

[jayuuey]

If you click my link above, we posted flow numbers for the eta, seta and i top ends.

No, the eta manifold does not flow better, but coupled with the 2.7i (flat pistons/885 head, eta manifold ported to accept the "i" throttle body), it gives more torque and power than a "i" manifold - but also, power drops more rapidly after 6000rpm than the "i" manifold on a 2.7i.

Is the power drop described negligible when comparing the E to I intake manifold? With my current setup, e bottom full i top, there isn't much power after 6k anyways. The tq difference in your dyno results makes me want to swap manifolds right now!

[JeLani]

Can someone , or the op , tell me how the cluster swap works for 2.7i's?


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