Bitz EFI Question
 

I'm thinking of switching to the Bitz EFI as my next project. I have a few preparation questions:

I prefer a stock look and would like to get a 3.2 intake. Will this fit a 2.7 engine and does this add any issues to the Bitz kit.

If I can use the 3.2 setup, can I just order the Bitz MS Computer & harness but use all the components of the 3.2? With the possibility of using the Bitz recommended Accel injectors?

Any advice would be great. I was to read up and educate myself on the conversion as much as possible so that I don't double the cost - like I seem to do with all my projects.

Thanks

Other than the cylinder head temp, there are no reusable sensors from the 3.2's. If Tony has a 2.7 tune, I'd use that. The WOT and idle switches will no longer be used. The speed and reference sensors on the flywheel are no longer used unless you went MSIII possibly? The air temp is built into AFM and will no longer be used. A mid-'90's BMW TPS from any model except 318 will fit throttle body after you make a half-inch thick spacer. GM air temp/manifold temp sensor is easiest to use. Not sure what TBitz uses for crank triggering? Probably dizzy where you cut a leg off from rotor? It's more accurate to use crank trigger if using ignition control. Not sure your route.

Vern,
You can do a very stock looking conversion with the original 2.7 intake. It will be less expensive than going out and buying a 3.2 intake and then modifying it to work.
If you look at Tony's site there are pictures in the gallery of the unmodified look.
His instructions are actually written to do it using the existing system.
I spent about 6 months researching and reading up on the conversion before I did mine.
Starts at post 114 here:
http://forums.pelicanparts.com/porsche-911-technical-forum/621680-finally-back-game-6.html

Tippy,
Bitz uses MAP and no ignition control. Simple batch fire. Keeps your CDI and just replaces the MFI with a simple EFI. No TPS either. Base map has you up and running right away. Decent maps for 2.7 available on their support site.
Really easy to install and use.

I would HIGHLY recommend running TPS. If you flood engine, it's great to have TPS and "flood clear" by pushing throttle past say 75% (you can program other %'s) and injectors are fully shut off.

Mine flooded while playing with the maps and full throttle like any injected car clears it.
The TPS is not activated in the programming installed in Tony's kit.
Just like any Megasquirt though it can be re-programmed.
Tony's kit is simple and a good starting point for learning EFI.

Yeah, I guess it would still work that way, I thought it may not.

To the OP, I have seen where others have used a stripped 3.2 intake for their Bitz kit, but I believe there are some modifications needed for it to bolt on. Maybe just the fan shroud holes need enlarging, maybe more. Not sure.

There is one major modification needed to use a 3.2L intake. That major modification is that intake places the fuel injectors in a location that there is a "ledge" on the head that blocks the fuel spraying from the injector.

I plan to convert my 3.0L to MS2/EDIS with a Carrera intake. As a result, I purchased a complete intake with everything, including the phenolic spacers.

In this pic, you can see the bottom flange of the intake with phenolic spacer in place. The fuel injector path is very clear.
http://forums.pelicanparts.com/uploa...1380716115.jpg

In this pic, I have placed a spare intake to head gasket from my SC over the phenolic spacer. As you can see the fuel injector path is now blocked, as if installed with no changes, there will be aluminum where there is gasket in this pic.
http://forums.pelicanparts.com/uploa...1380716206.jpg

There are 2 solutions to this problem.
1. If the engine is still in pieces or you are confident you will be able to catch all the filings, you can notch the intake runners of the heads to allow the fuel injector flow a clear path.
2. Turbo Kraft makes an adapter kit. It's plug and play and everything needed is included.

I wouldn't switch unless your injection system is shot completely and you can't get parts for it.
If it is currently working well and you switch, you will end up disappointed.

I'm replying because this old thread popped up today.

I ended up working thru all my CIS issues and the car now runs perfect. I will keep it as it is for now. It's hard to believe how much change in engine performance after getting my fuel pressures to spec.

Interesting comment, I see from your garage you have an aftermarket EFI, care to elaborate on the disappointment?

The OP has a hybrid CIS system made of multiple year components that he has been trying to deal with for quite a while and may be looking for a solution other than more 35 year old part replacements/rebuilds in the future. (edit: even though he has it working now)

My car with Bitz EFI runs great, it is all about the tuning....

It's not a "stock" intake for your engine, so it won't look stock. There are instructions with the Kit to do a 'stock' look install, keeping all the CIS appearing stuff. Another consideration is the port size, the Carrera intake is larger diameter than a stock 2.7 I believe and you'll create a step in your intake that's not helpful to airflow. If you bore out the head, that could be a good thing, but I suspect you weren't planning on doing that.

Having said all that, don't discount the benefits of the "clean look" install, that cuts down the air box. That install provides a LOT of room to work on the engine and makes getting things working right a lot easier. You can always do that as a first step and then go to the other intake once you're ready.

I am pretty sure the injectors are a drop in to the 3.2 intake. Things to check are the position of the throttle linkage, cold start air - you can use your stock AAR to provide extra air for cold starts.

For the $, I'd suggest the extra $400 to $500 a used intake commands, just isn't worth it, particularly for a first install. The beauty of the Bitz kit is that it provides a very good stepping stone to doing a lot more in the future. I'd suggest keeping it simple first and then build from there.