Do I need a new tune after replacing engine? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

paintdude258 · 10-29-2020, 11:23 AM

I spun a bearing and replaced my 2013 motor with a low mileage motor from a 2016 brz that was wrecked.

I was at 100k miles on the blown motor and the newer motor has around 30k miles.

The car is turbo'd.

Will I need to get a new tune once I get everything reinstalled? Will I need to change anything else such as the engine code for the tune?

Also, I am considering/planning switching from a crawford AOS to a dual VTA catch can set up. Will this affect the tune in any way?

Thanks for the help!

JazzleSAURUS · 10-29-2020, 12:02 PM

No car is exactly the same. It's always a good idea to retune after a major change. While this SHOULD be 1:1, a custom tune is tailored for your car, (mods, exactly how much fuel it's pushing, exact compression numbers, AFR's, everything.) They CAN BE significantly impacted if the old motor was low on compression and the new one isn't, or the new engine is particularly healthy.

Keep an eye on your fuel trims and AFR's and if all looks consistent you should be okay. I would always recommend you have your tuner check logs at least once after a major component replacement like this if your numbers aren't lining up PERFECTLY to what they were before.

paintdude258 · 10-29-2020, 12:24 PM

Quote:

Originally Posted by JazzleSAURUS

No car is exactly the same. It's always a good idea to retune after a major change. While this SHOULD be 1:1, a custom tune is tailored for your car, (mods, exactly how much fuel it's pushing, exact compression numbers, AFR's, everything.) They CAN BE significantly impacted if the old motor was low on compression and the new one isn't, or the new engine is particularly healthy.

Keep an eye on your fuel trims and AFR's and if all looks consistent you should be okay. I would always recommend you have your tuner check logs at least once after a major component replacement like this if your numbers aren't lining up PERFECTLY to what they were before.

This is exactly what my tuner said, so thank you greatly for the response.

I was under the assumption that I would need a whole new tune, so this is music to my ears. I will be sure and datalog once I get everything back up and running just to be sure.

JazzleSAURUS · 12-10-2020, 10:21 AM

No prob, how's it running?

10-29-2020, 11:23 AM	#1
paintdude258 Senior Member Join Date: May 2015 Drives: 2013 Subaru BRZ Limited Location: Austin, TX Posts: 121 Thanks: 71 Thanked 24 Times in 18 Posts Mentioned: 2 Post(s) Tagged: 1 Thread(s)	Do I need a new tune after replacing engine? I spun a bearing and replaced my 2013 motor with a low mileage motor from a 2016 brz that was wrecked. I was at 100k miles on the blown motor and the newer motor has around 30k miles. The car is turbo'd. Will I need to get a new tune once I get everything reinstalled? Will I need to change anything else such as the engine code for the tune? Also, I am considering/planning switching from a crawford AOS to a dual VTA catch can set up. Will this affect the tune in any way? Thanks for the help!

10-29-2020, 12:02 PM	#2
JazzleSAURUS Senior Member Join Date: May 2015 Drives: 15 BRZ LTD, 05 FXT Location: Western MA Posts: 1,032 Thanks: 561 Thanked 558 Times in 351 Posts Mentioned: 9 Post(s) Tagged: 0 Thread(s)	No car is exactly the same. It's always a good idea to retune after a major change. While this SHOULD be 1:1, a custom tune is tailored for your car, (mods, exactly how much fuel it's pushing, exact compression numbers, AFR's, everything.) They CAN BE significantly impacted if the old motor was low on compression and the new one isn't, or the new engine is particularly healthy. Keep an eye on your fuel trims and AFR's and if all looks consistent you should be okay. I would always recommend you have your tuner check logs at least once after a major component replacement like this if your numbers aren't lining up PERFECTLY to what they were before. __________________ SOLD: 2015 WRB BRZ Limited ('02 WRX BBS, S-04's, Stoptech Sport pads, MXP SP, AVO drop in filter, Mishimoto Intake tube, decatted header, OFT 93 Stage 2 EL Tune, Kartboy rear shifter bushing, Whiteline transmission and subframe lockout bushings, ST Coilovers, SPC Camber bolts w/smaller crash bolt, SPC LCA's & SPC Toe Arm bushings, Red TOMs, TRD Wing.)

12-10-2020, 10:21 AM	#4
JazzleSAURUS Senior Member Join Date: May 2015 Drives: 15 BRZ LTD, 05 FXT Location: Western MA Posts: 1,032 Thanks: 561 Thanked 558 Times in 351 Posts Mentioned: 9 Post(s) Tagged: 0 Thread(s)	No prob, how's it running? __________________ SOLD: 2015 WRB BRZ Limited ('02 WRX BBS, S-04's, Stoptech Sport pads, MXP SP, AVO drop in filter, Mishimoto Intake tube, decatted header, OFT 93 Stage 2 EL Tune, Kartboy rear shifter bushing, Whiteline transmission and subframe lockout bushings, ST Coilovers, SPC Camber bolts w/smaller crash bolt, SPC LCA's & SPC Toe Arm bushings, Red TOMs, TRD Wing.)

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