ZX3tuning

Hey guys, i would like to start collecting the parts required to make the conversion to EFI on my CIS 930.

i know i need a stand alone, 964 IM and injectors but what else?
crank fire system?
new fuel system?

i'm probably going to run a DTA P8 Pro for control but aside from that it's all up in the air!

perhaps a detailed list of parts and sources would help a bunch of members with the conversion...

i'll try and add suggestions to this post as they get added!

Thanks guys!


Manifolds:
- Stock Manifold with conversion blocks OR
- 3.2 Carrera Manifold OR
- 964 Manifold (may need to cut it down to clear) OR
- 1995 993 Manifold (may need to cut it down)

***If you use anything other than the stock manifold, you will need to address the 930 intake port (32mm) to intake manifold (41mm) size difference.***

Fuel:
- fuel rail
- pressure regulator
- fuel dampner
- injectors 55lb/hr-72lb/hr depending on your HP

ECU:
Motec
DTA
Pectel
Haltec
*wire harness for all of the above*

Sensors:
- Fast response intake air temp sensor
- Coolant temp sensor
- Throttle position sensor
- MAP sensor
- BAP sensor (if your ECU can use barometric pressure)
- Crank position sensor and trigger wheel, OR 60-2 DME style flywheel and factory sensor
- Cam position sensor (required for full sequential injection)
- Boost control valve (optional, but recommended)

Ignition system:
- MSD6A with the stock distributor
- waste spark coil pack
- or double waste spark coil pack for twin plug
- coil on plug

Geoffrey

You can use:
Stock Manifold with conversion blocks OR
3.2 Carrera Manifold OR
964 Manifold (may need to cut it down to clear) OR
1995 993 Manifold (may need to cut it down)

If you use anything other than the stock manifold, you will need to address the 930 intake port (32mm) to intake manifold (41mm) size difference.

You will need a fuel rail, pressure regulator and damper for your manifold. Stock or aftermarket works fine.

You will need properly sized injectors anywhere from 55lb/hr to 72lb/hr depending on your HP.

You will need a wire harness and appropriate connectors
ECU
Fast response intake air temp sensor
Coolant temp sensor
Throttle position sensor
MAP sensor
Crank position sensor and trigger wheel, OR 60-2 DME style flywheel and factory sensor
Cam position sensor (required for full sequential injection)
Boost control valve (optional, but recommended)


Ignition system depending on your configuration. It can be as simple as an MSD6A with the stock distributor, waste spark coil pack, or double waste spark coil pack for twin plug, or coil on plug.

jimculp

A pile of cash is recommended too.

125shifter

MAP sensor (and BAP sensor if your ECU can use barometric pressure)

ZX3tuning

alright, good info so far.
a couple of questions though...

how would one take advantage of a coolant temp sensor on an aircooled engine?
or are you suggesting using a oil temp reference as the coolant sensor?

as far as simplicity goes, it sounds like the stock manifolds with adaptors is the way to go but what gains would there be from the other manifold setups if any?

as a side bar, down the road i'm thinking of upgrading to a built 3.6L or 3.8L which would be the best setup to run on the 3.3L untill then?

thanks guys, keep the info coming!
some sources on where to get the parts would be nice aswell!

nathanUK '81 930 G50

The Autronic ECU, I think it was the SM4, is meant to be good.

Geoffrey

You need some way to determine engine temperature. The aircooled engine presents some issues since both the oil temp and cylinder head temp vary so much. Since the 930 cylinder head does not have provisions of a cylinder head temp, so you are limited to oil temp.

Unless you are going to twin plug and have the heads ported to 41mm, you are probably better just sticking with the stock manifold.

I'd suggest looking at MoTeC products.

D

A few optional components :

Wide Band O2 sensor
Idle Control Valve
Laptop computer
Bucket, bag or box of Patience...

dyerkes

Pick the best tuner, and have him determine what EFI system to go with. There are plenty of good choices in EFI systems, but without the right knowledgeable person tuning your system you might be in for additional expenses and headaches.

David
1986 911 Turbo

Raceboy

WB should NOT considered as an option, but a MUST!
Cost of a WB sensor (~70-80$) is cheap to replace after couple of tens thousands of miles compared to replacing and engine. It's a good safety monitoring device and should be as important as say oil pressure. Both showing wrong numbers lead engine to disaster.

A.Wayne

The DTA is a good choice , ditch the distributor also. use wastespark coils or coil on plug. Try Jeff Gamroth at Rothsport , he has billet valve covers that i believe accommodates coil on plug conversion. Monitor oil temp . If doing the conversion with the 930 manifold or 3.2 manifold .

you will need,
1. Air temp
2. oil temp
3. tps
4. Map sensor, 3 bar
5. 72 lbs inj.
6. crank sensor
7. crank wheel 36-1
8. boost control valve
9. Wire Harness .
10 coil pack 2 if twin spark
11. lambda sensor.

Peter Carroll/Toronto

I've been through this project and I've learned quite a bit. If I ever did this again (which would be insanity), I would go to a wrecker and pop in a nice 993TT motor with a chip. You'd have tons of power and torque and great drivability.

Or... you can always buy a new GT3 and park the rest of the money in some nice medium risk Mutual Funds.

Seriously... You might want to think about some nice non-restrictive headers. B&B would be better than GHL. You might need custom B&B if you need them to flow more. Oh, and add some serious oil cooling. As the power goes up, so will the heat.

You will probably need a better clutch. Oh and you might want to start thinking about brakes.

Now you're really moving. Some safety equipment would be a good idea. A roll bar is be a must. Some race seats to hold you in, and maybe a harness.

But you still get passed, so it's suspension time. Oh man - should have done that first! Need new rims now.

It never ends... AAAARRRRGGGGGHHHHHH!

jimculp

HAHA!
Nice post.

125shifter

Here's where I drilled and tapped the oil breather cover for the oil/engine temp sensor:

A.Wayne

For the oil temp sensor , you would want the sensor to be submersed in oil , the thermostat cover or the oil feed tube on the left side on the cylinder head will work.