What stand alone EFI (if any)?

It's my dream to put a 911 engine in my Boxster, and recently, I had the opportunity to drive one that has had the swap performed (that car was a 99-model with an early, 310hp M96 3.4L in it). It certainly showed me that I'm on the right track to building a car I'll positively love. But although that car was loads of fun, it wasn't what I would call a properly fast car. Naturally, when I build mine, I want it to be more powerful. To that end, I'm thinking I'll swap a 3.6L into mine, but then I'll bump into EFI issues. Specifically, I'll either have to use a smaller 3.4 manifold or ITBs, because my car and early 996s used throttle cables while later Boxsters and 996s (including all 3.6L cars)used drive-by-wire electronic throttles. With an early 3.4, the 996 ECU can be used. With the later 3.6L, not so much; the 3.6 has variable valve timing and lift where the 3.4 has only variable valve timing.To use a 3.6 in my early car, I either have to downgrade it to just variable valve timing (not lift), and the aforementioned 3.4 intake manifold, and get a custom tune in a 3.4 ECU. Or, my favorite idea: use ITBs and a stand alone EFI that can control the variable valve timing and lift. Emissions compliance is not a concern because my Boxster is old enough to be exempt. This whole thing sounds like it's going to get pricey. Got any EFI suggestions that can control variable valve timing and lift?

Definitely do the ITBs. The noises will be worth it even if it's slow.

I am going to have to do some research.

How hard is it to put the harness throtal and the ecu with the 3.6 in your car. You would just need to figure out what it needs to control the motor. Are the 3.6s a Can-bus type controlled system?

I think this is a big dollar motec system exhaust type deal

With variocam and lift, you're going to need some serious e36m3 to control it. I think youd be better off doing an older swap that has less technology, what about older gt3 stuff, would that be easier and cooler? Also, ifits closer to plug and play, it's cheaper than crazy standalone stuff is going to end up being as well as better tuned by the stutguart dudes. Thirdly, it's cooler to have a gt3 engine

In reply to sesto elemento:

I love the idea, but GT3 engines are completely different engines, cost about $30,000, used, and take some serious re-engineering to get into a Boxster (Musante has done it). It would be the coolest of the cool, though! The biggest drawback to a GT3 engine is that I can't buy a crashed GT3 donor inexpensively like I can do (and have done) with a plain jane-jane, crashed 996.

wow.. a 99 boxster is old enough to be exempt from emissions? I wish I lived where you are.. even my 77 spider still has to pass emissions here in NJ

In reply to mad_machine:

Rolling fifteen year exemption here in Massachusetts

This sounds like a job for my good friend Ellis Juan.

M030 wrote: In reply to sesto elemento: I love the idea, but GT3 engines are completely different engines, cost about $30,000, used, and take some serious re-engineering to get into a Boxster (Musante has done it). It would be the coolest of the cool, though! The biggest drawback to a GT3 engine is that I can't buy a crashed GT3 donor inexpensively like I can do (and have done) with a plain jane-jane, crashed 996.

What about a blown up one? Then build it?

BrokenYugo wrote: This sounds like a job for my good friend Ellis Juan.

holy crap. out of breath. too funny.

you win.

Just tuned an 82 911 SC over the weekend on Megasquirt. I would love to do more.

You have more info on the variable timing/lift controls? Edit - found details, no worse to control than the vw vvt.

Get a drive by cable throttle body on the 3.6 and its cake.

I was about to say, you are asking GRM. The answer is Megasquirt!

If you can save the harness it could make for a fairly simple wire in for it.

Something to think about- it's one thing to be able to control it.

It's a very different thing to calibrate it so that it works well enough to do it.

VCT needs a lot of dyno time just by itself (without previous data), adding variable lift adds another dimension to that work. Still, VCT with ITB, is going to be an interesting thing to play with- I don't think the VCT map using a single throttle will worth with ITBs- so you'd have to completely re-map that.

And if you really have to have both, the electronic throttle will be needed- as the variable lift also acts so much like a throttle that there will be big interactions with the throttle and cams.

With the complexity of stuff comes complexity of tuning.

When I did the Turbo II, I found that the prevailing choice for rotaries was the Haltech, so that's the way I went. I would solicit recommendations from the community of hardcore Porsche modders, assuming such a community exists!

1988RedT2 wrote: I would solicit recommendations from the community of hardcore Porsche modders, assuming such a community exists!

In reply to 1988RedT2:

I'm sure they exist, but I haven't found them yet

"Hardcore Porsche Modders" are usually sought after with pitchforks.

You need to forget all about messing with your Boxster and get back to your beetle.

In reply to dean1484:

Hopefully, the two projects aren't mutually exclusive, and Musante had the answer to 3.4 vs 3.6 Boxster power.. They said bore the 3.4 out to 3.8, which is my favorite idea ever (besides, of course, a mid-engine GT40 disguised as a VW Super Beetle)

sesto elemento wrote:

M030 wrote: In reply to sesto elemento: I love the idea, but GT3 engines are completely different engines, cost about $30,000, used, and take some serious re-engineering to get into a Boxster (Musante has done it). It would be the coolest of the cool, though! The biggest drawback to a GT3 engine is that I can't buy a crashed GT3 donor inexpensively like I can do (and have done) with a plain jane-jane, crashed 996.

What about a blown up one? Then build it?

You most likely don't want to find out how much the parts cost. Even by Porsche standards.