AYS long block swap S6

[Gogeees]

Hey Everyone, it's been too long!

My BBD needs a head rebuilt and I'm going to take my time rebuilding it. I would like to drive my car again in the meantime. Sooooo, I bought a AYS off ebay to swap into my 6 speed s6.

Long block came complete with accessories and harness, but no ecu.

As I understand, the harness should be plug and play between the s6/s8 ecu. I'll swap out oil cooler and filter housing from the BBD.

My question is what ECU do I need to get it running. Can I get a tune for existing S6 Ecu? Or do I need the s8 ECU with a 6 speed tune?

Any other insight into this process would be appreciated!

Just received my AYS, getting ready to start pulling my motor this week.

Thanks for your help!
Gogeees

[Aktapod]

The AYS and BBD are essentially directly physically interchangeable. As you noted, you'd need to swap the oil cooler and filter assembly out, as well the harness. Most of the hardware, including internals, are identical. Some say one of the cams are different between S6 and S8, but when I pulled them out of my engines, they had the same part number stamped on both the intake and exhaust. Your results may vary.

As for ECU, the S8 ECU could be interchanged and recoded, but it would need immobilizer disabled or matched to the cluster. I would recommend just sticking with your S6 ECU and harness. While it will run as is, you'll want to have it flashed for a manual configuration to improve the driveability (it won't rev hang after the update) and to remove the check engine light for the missing TCU. Aaron Walizer has a excellent tune that will not only take care of this, but also make the motor more responsive.

Good luck!

[Gogeees]

The AYS and BBD are essentially directly physically interchangeable. As you noted, you'd need to swap the oil cooler and filter assembly out, as well the harness. Most of the hardware, including internals, are identical. Some say one of the cams are different between S6 and S8, but when I pulled them out of my engines, they had the same part number stamped on both the intake and exhaust. Your results may vary.

As for ECU, the S8 ECU could be interchanged and recoded, but it would need immobilizer disabled or matched to the cluster. I would recommend just sticking with your S6 ECU and harness. While it will run as is, you'll want to have it flashed for a manual configuration to improve the driveability (it won't rev hang after the update) and to remove the check engine light for the missing TCU. Aaron Walizer has a excellent tune that will not only take care of this, but also make the motor more responsive.

Good luck!

My BBD is already running that tune from Aaron Walizer. I guess its just a straight swap then and I should be running with that file?! I have been lagging but started some of the work this weekend. Getting ready to disconnect the driveshafts and yank the BBD.

[Gogeees]

https://imgur.com/a/s6-ays-swap-8obl5NH

[Bfives]

Why would the harness not be plug and play from the AYS? Both cars are ME 7.1.1 and it's my understanding that the ECU's can be swapped (with proper coding) which would imply that they have the same pinout.

[Gogeees]

Ecu is on the passenger side in the S8, so the harness is on the wrong side. The donor motor came with a complete engine harness, so I at least now have extra connectors for all my broken tabs on my s6 harness. The cable run to the rest of the car was cut. I do not have the ecu anyway and it wouldn't match the cluster.

[replica_rs4]

I'm doing reverse of what OP is doing .
S6 engine into s8
Camshafts indeed have same lift between BBD and AYS.
Same part # , but letter suffix is different.
So, ether valve lift is the same with a different cam profile or that letter suffix is the superceded part number and cam are the same.
20 hp difference seems like a lot for just a tune . S6 aftermarket tunes would see large bumps in power over stock .

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[replica_rs4]

S8 AYS
077 109 021 FS bank 1 intake
077 109 022 EE bank 1 exhaust
077 109 021 FR bank 2 intake
077 109 022 EF bank 2 exhaust

S6 BBD
077 109 021 FQ bank 1 intake
077 109 022 DP bank 1 exhaust
077 109 021 FR bank 2 intake
077 109 022 DE bank 2 exhaust

077 109 021 FR is shared between 2 of my motors .
There is another thread on az where a person with s8 AHQ motor was equipped with DE and DP exhaust camshafts from factory.

Measurements from s6 camshafts
51.45-43.98 = 7.47 lift
52.31-42.06 = 10.25 lift
Used a cheap caliper, so measurements may vary a little .




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