was 40MM PMOS at first then 50MM PMO EFI with infinity

I thought efi systems didn’t like cams with a small lobe centers. My DC40 has 102 degrees vs many cams for efi being 110-113 degrees.

I’m curious because I thought the vacuum signal would be very poor and unstable for efi.

You can change the MAP sampling window plus smoothing on MegaSquirt if the signal is rough.

Could that also cause lean running if the signal is smoothed and not corrected?

Just wondering. Very interesting topic.

I know the 102 lobe center doesn’t work with cis because it affects the airflow measurement.

You could also run Alpha-n or a mixture of Alpha-N and MAP.

Mike can fix it, problem is not AEM. I would prefer motel but AEM is ok. If it were in my shop I would swap the crank to increase displacement and twin plug it in hopes those pistons would not go over 10.6:1. Mike is very good at this but I think a good 3.0 crank is worth about $1000 and a good 964 crank is about $1200. may be worth the change up for an extra 40 hp. I know rods and maybe pistons nut a 3.3 at 9.5 is probably only good for 270 at the wheels when sorted. William Knight

Agreed. The AEM Infinity, running TPS/Alpha-N for load works exceptionally well. A couple friends are running TPS based load with ITB induction on street cars and they run exceptionally well.

I switch from MAP based load to TPS based load on one of our cars running the Infinity and it runs and drives like a factory ECU was in place.

David

Very beautiful kit! I already have the pulley 60-2, I wonder if we can buy the kit Rasant without the pulley. :)

Hey guys Mike got the motor apart and all is well. Nothing wrong with it or the parts. I want to sell the EFI set up if anybody is interested in it. The complete set up has less then 2K miles if that. I'm just tring to pay for a new set of PMO carbs for the new build. So $5K shipped. I will everything that came with it.


http://forums.pelicanparts.com/porsche-911-used-parts-sale-wanted/995308-complete-pmo-50-efi-kit-infinity-ecu-911sc.html#post10021960

50MM set up
Here is the info on the EFI ITB

1 ECU AEM Infinity 508 1
2 MAP Sensor, IAT & CHT Sensors, O2 Sensor 1
3 Fuel Pressure Sensor 1
4 Ignition coils for Coil on Plug- Bosch + S plugs 6
5 Fuel Injectors upgraded/rebuilt Bosch 6
6 Wiring Harness conn, hardware, smooth Sheath 1
7 Wiring Harness Fabrication, includes relay/fuse center 1
8 Fuel Pressure Regulator 1
9 Fuel- 6AN fittings and ethanol hose- Black 1
10 Crank,Cam position sensor (EPM) and mount 1
11 PMO 50MM ITB's. new manifolds, linkage, air cleaners 1




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More pics

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WTF?!?! You’re going to carbs from EFI? Why on Earth would you ever do that?!

Seriously

I was hoping to see you get this sorted out.

mabe the old school are easy to work with ...
I heard it is a pain in the ass to keep carb top tune

Carbs work great, there is nothing to go out of tune, I had much rather sell fuel injection. Injection on N/A motors is better in mountains or high elevation changes. Mike will have the PMO carbs dialed in in about 20 minutes if there changing to that. William Knight

You never did post the ignition map from the tune. I was very much looking forward to seeing how aggressive it might be. Are you gonna toss on a dizzy too? I can understand your frustrations with the efi setup. It's not for everyone and does require some trial and error.

Sometimes analog is the answer. We we're just hoping for comeback story that kept the original cast is all.

So, you're shelling out a huge amount of cash on this rebuild because someone couldn't tune or troubleshoot your EFI, or even present an AFR plot?

Throw the 'right' 60-2 or 36-1 crank trigger on it, and try again.

Much easier and faster than throwing in the towel on EFI!

I'd even do it for you if I lived near by.

This is hurting my soul....

I respect your experience, but am going to have to disagree with you here.

What is there to go out of tune on EFI? Once properly tuned, it's "set it and forget it".

Then it's only sensor replacement if one were to ever go out just like any other modern car. Much cheaper than replacing worn out carbs.

+1

PMOs aren't that super great either. A friend has a set on his car and they work really great but when you change something on the engine you have to change jets and tune it to get it perfect. If I recall correctly he had to modify (not adjust, modify) the throttle linkage because out of the box they wouldn't open both banks the same amount.

Back to carbs... To each their own but... No way. Trade in the computer for a telegraph?

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