77 911s CIS to PMO EFI

[meichten]

Hello, newbie to posting in the forum. Been reading for a while, enjoy all the knowledge and the pics. Been working with Richard @ Clewett Just getting started on first major project with PMO ITB EFI TECgt, found several answers on the forum, however have a few more questions.

1. Is the fuel accumulator still required in this setup? Or should we remove and run lines direct to fuel filter then return direct from the FPR to return line?

2. Do we need to hookup vacuum hose off FPR? If so, where to?

3. Is there a list of the electrical which needs to stay connected? Know we need to keep the oil sensors, fan and alt, starter, rear lights, reverse light.
Removing CDI, distrib, current air pressure.

We have the 6ft harness and will be extending to around 10 ft to install under the pass seat.

Appreciate the help. Thank you

Progress to date and fuel filter setup.

[meichten]

Wanted to add some more details to the project.

Starting Point 77 911s


Initial day was CIS removal in car and engine drop. The 77 case requires additional material removal for the crank sensor. Also dropped for better access to install the cam sensor on cylinder #3.



CIS Intake removed following Wayne's book and bitz guide, next time we'll label all the wires and hoses before removal.


Engine Drop

[theFONZ]

Awesome project and I'm jealous of that color.

Let me preface by saying I'm no expert. I converted my previous SC to megasquirt EFI and completely ditched the accumulator. I cut the rubber hoses off and used fuel line and clamps to run to the rails and FPR. I wish I could help more, but that was over 10 years ago, so I've forgot most of the conversion.

[prschmn]

No need for the accumulator. Richard-PMO would have included a vacuum manifold Though I just use two opposite vacuum ports I E 3-6 2-5. But I havent used Electromotive stuff for a while,
Usually Haltech but Electromotve always leaned toward MAP based programming so I suspect theres a port o the TEC unit. Once you've done the EFI wiring it will become obvious what you no longer need.

[meichten]

Thanks for the feedback and the nod on the color.

Will plan to remove the accumulator and go direct to the return from the FPR.

Will also keep the existing wiring in place as we install new wire harness.

Next up routing the wiring through the car to mount under the passenger seat. Plan to splice a few feet into the wire runs. Will try to take some better progress pics.

Couple of notes on the install so far.

When installing the ITB to the intakes the cylinder #1 front bolt has to be placed on before the ITB is pushed all the way down, screwing in as you go.

Also, if anyone has a trick for getting a torque wrench for all the ITB I'd be interested in that as we were only able to get access to a few, the rest were done with a normal wrench to feel.

[meichten]

Some updates from the past week
Crank pulley installed, 77 case requires grind by the left side of the puller for the sensor. Also had to shave some of the bottom of the fan housing.



Cam shaft sensor required a bit of machine work, Richard @clewett was able to take of that for us, thank you for the continued support. Bolt tapped and in place.


Wires wires wires.... Decided to move the tec gt unit under the passenger seat. Spliced the existing harness to extend a bit. Was trying to locate a longer ecu to dfu cable, ended up finding a 6ft one on the electromotive site and will add in.


Getting closer. CHT also tapped and installed over cylinder 4.


Next up, need to source connectors for existing fuel lines to the filter and for the return from the an fittings.

[Tidybuoy]

Originally Posted by meichten

Hello, newbie to posting in the forum. Been reading for a while, enjoy all the knowledge and the pics. Been working with Richard @ Clewett Just getting started on first major project with PMO ITB EFI TECgt, found several answers on the forum, however have a few more questions.

1. Is the fuel accumulator still required in this setup? Or should we remove and run lines direct to fuel filter then return direct from the FPR to return line?

NO, Fuel is routed: Tank>Fuel Pump>Fuel Filter>Fuel Rail>Pressure Regulator>Back to tank.

2. Do we need to hookup vacuum hose off FPR? If so, where to?

I had the same question when I did mine and Clewett told me it was not necessary.

3. Is there a list of the electrical which needs to stay connected? Know we need to keep the oil sensors, fan and alt, starter, rear lights, reverse light.
Removing CDI, distrib, current air pressure.

You will be removing your CDI and distributor. All other electrical stays. I had "Timmy 2" make me a new engine wire harness since mine was brittle. He removed thermo-time switch wiring and added a main power wire that I used to supply power to my electromotive computer. He also added a "switched power wire -the electromotive needs both. I mounted my computer under the driver seat but ran the wires to the rear where they connect to my rear fuse panel.

We have the 6ft harness and will be extending to around 10 ft to install under the pass seat.

I ordered the extra long 12ft wire harness from Clewett. This gave me plenty of wire to work with. I ended up cutting about 3' from each wire at each sensor. The extra long harness enabled me to mount the computer under the seat, run the harness parallel to the stock wire harness and then around the rear fire wall to rear fuse panel. where the CDI was, I mounted the controller for the O2 sensor. and the two relays that are used for the computer and the fuel pump. from there all wires are routed to the various sensors. My goal was to have a very clean engine compartment.

Good luck with your project - you will be happy when you get it all done.

Appreciate the help. Thank you

Progress to date and fuel filter setup.

Here's mine:

[meichten]

All of the engine components are ready to go.
Started routing the harness through the tunnel like bitz kit, however decided to switch to rear driver side footwell and drilled 1.5 in hole through below torsion tube.
Much easier to route the terminated harness.
Working on the front routes now to the battery post, FP, starter and ground. Will add some more pics this week as we get to it.

[mhackney]

Your location says "USA" but given that the photo is upside down, are you in Australia?

[75 911s]

Good to see a narrow body with a duck! Lovely color too.

[meichten]

With the busy summer haven't had as much time to spend in the garage as we'd like.

Past week we did get some time.
Transmission rebuild is complete with lsd. Thank you Jerry


Engine is now back in the car


Wire harness and runs are all complete. Next steps are to plug everything in and complete diagnostics with the laptop.

[meichten]

Good news is car is running and we are working through balancing air flow and the two itb throttle arms.



Not so good news, as we were locking the clutch cable in the clutch cable support decided to snap off. Ordered anew on from the host, however does anyone have any ideas why?





Also working out the throttle linking into the engine bay as the exiting arm is about 2 inches too long. There are a few posts on this already it looks like.

[meichten]

Took maiden voyage around the block earlier this morning. I'm sure the neighbors enjoyed the throttle whine...

Clutch cable support replaced. Cable installed and clutch adjusted.

Stompski racing shift coupler installed and adjusted.

Backdated throttle rod to replace existing from host was the same size, so we chopped 1.25 inches off and

Now onto the tuning, currently using base BIN from Richard Clewett.
https://youtu.be/MoIn-67X_fs