Jeep Engine swap

[Cgaines98]

Hey all,

This story starts three months ago I bought a 2006 B6 S4 at an auction not running. The usual skipped timing and dropped valves story. I got a donor engine, rebuilt it with RS4 parts and everything new I could throw at it. Drove it 20 miles and then found out the car is not allowed on the road due to title issues that are non reversible (thanks to the auction house for doing this, was totally avoidable and was filed incorrectly)

My main passion is off road, specifically Jeeps and Prerunners. I have a 1989 Jeep Comanche that needs and engine, and a perfectly running B6 S4 in the backyard ready to go.

I have built and done a few engine swaps, mostly American motors, LS, SBC, stuff like that. So I understand the challenges of engine swapping stuff.

I have a few concerns with this swap though mostly due to the complexity. Running a standalone ECU is an option, but I would prefer to keep the stock ECU so I can retain the factory Paddle shifters, and trans controls. I would need to trim down the Harness Extensively and disable numerous things in the ECU. If doing that is feasible, and somewhat logical then I would prefer to do that.

If that doesnt make sense to do, I can do a standalone and find a manual trans locally to put behind it. (recomendations on what standalone is best for a stripped down BHF appreciated)

In either scenario I would weld the center diff and run it in RWD option UNLESS someone knows of a RWD only trans that will bolt to the engine thats easy to get?

The items I wouldn't need, that would hopefully be disabled or fooled are:
-ABS
-Traction Control
-HVAC
-Immobilizer
-Wheel speed sensors
-Steering angle sensors
-all interior comforts
-Airbags
-Parking Brake
-PCV system
-Secondary air pump system
-Fuel system sensors
-Key FOB



The items that are preferred but optional to keep are:
-cruise control
-Auto transmission controls
-Paddle shifter control
- Oxygen Sensors

The items that are definitely needed are:
-only things required to keep the engine running and transmission shifting if I can keep the auto

I know this seems like a crazy plan, but lets imagine for now that the build has unlimited time frame, but not an unlimited budget.

Thanks for the time!PXL_20210418_172459784.jpg

[Zolli]

I’m sorry I don’t have much to add yet, but this project looks awesome. So I’m subscribing in order to keep tabs

[Cgaines98]

Put my old ruined engine together enough to see how it would fit. Looks tight but doable

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[copperbricks]

Wow, this is an awesome project. I'd suggest getting in touch with Jackal Tuning to see how much they can help you out on the "delete" front. I believe they sell ECUs with the immobilizer defeated which is probably a step in the right direction for you and I'd guess they can also switch off at least some of the things you're looking to delete.

[Cgaines98]

Wow, this is an awesome project. I'd suggest getting in touch with Jackal Tuning to see how much they can help you out on the "delete" front. I believe they sell ECUs with the immobilizer defeated which is probably a step in the right direction for you and I'd guess they can also switch off at least some of the things you're looking to delete.

Glad to hear you like it!

I did email back and forth with Matt @ jackal motorsports this morning. With the immobilizer turned off it'll run, but getting the auto trans to be happy with all the drivetrain sensors removed will be a problem. So I could strip the harness and do a manual swap...or I could just do a manual swap and do a standalone that will fight me a lot less than the stock ECU would. Looking into that tonight.

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[Zolli]

This is going to be awesome, way better than the old Cherokee 4.0s.

Looks like you might need a modified hood to fit the intake manifold and oil filter, but a hood scoop there would help with the heat issues, anyway.

Good idea going to Matt at Jackal.

Does the oil pan extend down a bit low? Perhaps a metal Thor plate (or similar) would protect it well enough

[Cgaines98]

This is going to be awesome, way better than the old Cherokee 4.0s.

Looks like you might need a modified hood to fit the intake manifold and oil filter, but a hood scoop there would help with the heat issues, anyway.

Good idea going to Matt at Jackal.

Does the oil pan extend down a bit low? Perhaps a metal Thor plate (or similar) would protect it well enough

A cowl hood will more than likely be required, no problem with that though.

I am still playing with engine placement, so the oil pan may or may not be an issue still

[Cgaines98]

This is going to be awesome, way better than the old Cherokee 4.0s.

Looks like you might need a modified hood to fit the intake manifold and oil filter, but a hood scoop there would help with the heat issues, anyway.

Good idea going to Matt at Jackal.

Does the oil pan extend down a bit low? Perhaps a metal Thor plate (or similar) would protect it well enough

A cowl hood will more than likely be required, no problem with that though.

I am still playing with engine placement, so the oil pan may or may not be an issue still

[CONative]

Sub’d for updates as this looks like a fun project you’re pursuing. Reminds me of the folks who successfully did a 2JZ swap into their Audi but this is just the opposite. Best of luck OP!


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[Cgaines98]

Sub’d for updates as this looks like a fun project you’re pursuing. Reminds me of the folks who successfully did a 2JZ swap into their Audi but this is just the opposite. Best of luck OP!


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Thank you! Oddly enough a 2JZ bolts up to the existing jeep transmission, but I'd still rather do the Audi swap.



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[Cgaines98]

Does anyone have a B6 or B7 S4 throttle body lying around to take measurments on the bolt pattern?
I am going to run a megasquirt on mine and will need a DBC TB. Need the spacing to get one ordered.

Thanks!

[CONative]

If nobody else chimes in I can get you these tomorrow as my engine is currently out.


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[Cgaines98]

If nobody else chimes in I can get you these tomorrow as my engine is currently out.


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Would really appreciate that!

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[VinnysS4]

Does anyone have a B6 or B7 S4 throttle body lying around to take measurments on the bolt pattern?
I am going to run a megasquirt on mine and will need a DBC TB. Need the spacing to get one ordered.

Thanks!

I can get you this. Give me a few
Btw... love the project. I've done the manual swap on the s4. If you go that route and get stuck, let me know.

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[VinnysS4]

This is The side that connects to the elbow on intake manifold

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[Cgaines98]

Very Much Appreciated!! Thank you.