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911 Motronic Chip Upgrade

Pelican Technical Article:

911 Motronic Chip Upgrade

Grego Gulik


1-2 hours






10mm socket, ratchet and a variety of extensions, flathead screwdriver, sharp knife, needle-nose pliers, a tank of high-octane fuel

Applicable Models:

Porsche 911 (1984-89)

Parts Required:

Autothority Performance e-proms (#POR.01.911.300)

Performance Gain:

Up to 16-horsepower gain for the drivetrain

Complementary Modification:

Replace the Motronic chip with an even higher performance chip

I am not responsible for any problems you experience as a result of trying to do anything described here. The hack documented here worked fine for me but may not work for you for any number of reasons.

I decided to install the Autothority chip to try to sqeeze out a little bit more power out of my 911. This car already has some exhaust modifications to make it more free flowing, but like it always is with speed, you can never have enough.

The Autothority chip claims a 16BHP increase in the 3.2L US spec engine. Although I didn't do a dyno test before and after, I can tell that there is a little bit of improvement. The butt-dyno says that there is some significant improvement below 4,000 RPMs, and a smaller improvement at higher RPMs. I didn't test the higher rev limiter, nor do I plan to do it deliberately. I've heard others describe the improvement as "waking up the car", and I have to say that's pretty accurate. I might go back at some point and do a dyno test to see if there is anything close to the claimed performance improvement.

Was it worth the extra price over the Weltmeister? I guess I'll never know.

Before beginning this hack yourself, you will need the following items:

  • Autothority Performance E-Proms part# POR.01.911.300
  • 10mm socket, socket wrench, and a variety of extenders
  • Flat blade screwdriver
  • Sharp knife
  • Needle-nose pliers, for picking up things that fall in annoying places.
  • A tank full of 92 octane gasoline.

Some people have suggested removing the driver's seat to make it easier to get to the Motronic box (where the chip goes). I tried to do this, but one of the bolts that holds the seat in just wouldn't budge and I was afraid I was going to strip the bolt. I then poked around and found that the 4 nuts that hold the Motronic box were pretty easy to get to with the seat in all the way back, and raised, if you have that feature.

Click on thumbnail to view full-size image

Here is the chip as shipped. The chip came with instructions from Autothority. READ THEM! I will not repeat most of what is in there.

When you lift back the carpeting per the instructions, you will see the bundle of cables and the Motronic unit. The arrows show the location of the 4 nuts that hold the Motronic, the circle shows the location of retaining clip that holds the connector, and the box shows the location of the bolt that holds the wire bundle.

Unbolt the relay to make it easier to remove the Motronic, then remove the retaining strap and finally the unit itself per the instructions.

Per the instructionsn bend the tabs on the bottom. I used the knife to pry them up enough to get the screwdriver under them.

Here you see the two circuit boards and the ribbon cable.

Here is where you separate the posts with the screwdriver. Remember to do both.

The instructions don't mention it, but there are two clips at the top of this picture. Press down in the slots with a screwdriver and gently pull the motherboard out.

Finally you can unfold the two circuit boards flat. The chip you are replacing is on the far right.

Here is the original chip on my board. Your mileage may vary.

Here I'm about to slide the new chip in. Make sure the notch aligns with the notch on the socket and the pins all align with the holes. Gently press down. Do not force it.

Put it all back together in reverse order. I needed to pop this out temporarily to get the cover to go back on, then replaced it later.
Comments and Suggestions:
keith Comments: will this work in a 1980 911 sc 3.0
July 26, 2011
  Followup from the Pelican Staff: You would have to check if the chip is made for your vehicle. If so, then I would imagine it will work. There may be other options out there to increase performance, vive our parts specialists a call at 1-888-280-7799. They can help you sort them out.
- Nick at Pelican Parts
rody Comments: i love bmw so much im rody mizher my work mechanic bmw in lebanon
January 8, 2010
  Followup from the Pelican Staff: Glad to hear it. - Nick at Pelican Parts  
jose Comments: you think I can use this chip in my 911 3.2 coupe 86 europe spec 231 hp.. you think give me 16hp more?
August 2, 2009
  Followup from the Pelican Staff: Yes, it will probably give you a little more boost, however a 5% increase in HP might not be too noticeable. - Wayne at Pelican Parts  

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