Does a built motor require a tune? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Astroboy · 05-21-2018, 12:35 AM

I was thinking about upgrading my rods valve springs and pistons and was wondering if i would need to get a tune right after? Im trying to get forged pistons with a cr of 10:1 and was wondering if I need a tune if im lowering the cr. I also have a turbo kit I'm going to install after installing the rods and pistons and valve springs. But if i don't require a tune for just the rods, pistons and valve springs than I wouldn't mind driving the car around with just a built motor in order to break everything in.
Thanks

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nikitopo · 05-21-2018, 02:53 AM

You are changing basically characteristics of your engine like pistons and compression ratio. You definitely need a tune, since the existing tune will not be optimal. Why don't you install the turbo kit together?

Astroboy · 05-21-2018, 09:31 PM

I didn't want to install the turbo kit because i wanted to break in the built motor first. But my tuner told me that the power goals im aiming for the stock components can handle. So i might just save my money instead

Quote:

Originally Posted by nikitopo

You are changing basically characteristics of your engine like pistons and compression ratio. You definitely need a tune, since the existing tune will not be optimal. Why don't you install the turbo kit together?

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Lantanafrs2 · 05-21-2018, 09:48 PM

Christ, a stock motor requires a tune.

weederr33 · 05-21-2018, 11:11 PM

Whether you have the turbo on or not, as long as you stay within the break in specs, nothing will go wrong. You drive it without a tune on lowered compression ratio, you will have more to worry about than a break in period.

shr133 · 05-26-2018, 04:41 PM

Quote:

Originally Posted by Astroboy

I was thinking about upgrading my rods valve springs and pistons and was wondering if i would need to get a tune right after? Im trying to get forged pistons with a cr of 10:1 and was wondering if I need a tune if im lowering the cr. I also have a turbo kit I'm going to install after installing the rods and pistons and valve springs. But if i don't require a tune for just the rods, pistons and valve springs than I wouldn't mind driving the car around with just a built motor in order to break everything in.
Thanks

Sent from my LG-H871 using Tapatalk

The stock tune tune will work on a engine rebuild. If you lower the compression it will be safer than stock. The computer will also learn the new engine. If you are getting lots of porting work, changing valves and cams, you should get a tune sooner than later to play it safe...

That being said I would want at least a stage 1 tune and do a good data log to make sure nothing is out of wack. You don't want to burn up a new engine because the stock settings are too far off.

kimcheefists · 06-07-2019, 10:55 PM

I apologize in advance for reviving an old thread but I just wanted to know if a newly built engine should start after only changing the compression ratio without a new base map. My car has been in the shop getting forged internals for the past couple months and now will not start..

humfrz · 06-07-2019, 11:56 PM

Quote:

Originally Posted by kimcheefists

I apologize in advance for reviving an old thread but I just wanted to know if a newly built engine should start after only changing the compression ratio without a new base map. My car has been in the shop getting forged internals for the past couple months and now will not start..

I'm guessing that the engine should start, maybe not run its best with the stock tune.

PS - I'd suggest you make sure the ECU is screwed down tight (grounded).

humfrz

Lantanafrs2 · 06-08-2019, 03:34 AM

More like the amplifier box

05-21-2018, 11:11 PM	#5
weederr33 Airborne at your service Join Date: Sep 2014 Drives: '17 BRZ Series.Yellow Location: El Paso, Texas Posts: 6,326 Thanks: 4,529 Thanked 5,587 Times in 2,929 Posts Mentioned: 33 Post(s) Tagged: 2 Thread(s)	Whether you have the turbo on or not, as long as you stay within the break in specs, nothing will go wrong. You drive it without a tune on lowered compression ratio, you will have more to worry about than a break in period. __________________ Series.Yellowbird - http://www.ft86club.com/forums/showthread.php?t=122135 MS, CSCS, TSAC-F, CPT

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05-21-2018, 02:53 AM	#2
nikitopo Senior Member Join Date: Mar 2014 Drives: '15 BRZ RA Location: Greece Posts: 3,787 Thanks: 2,416 Thanked 1,944 Times in 1,261 Posts Mentioned: 29 Post(s) Tagged: 0 Thread(s)	You are changing basically characteristics of your engine like pistons and compression ratio. You definitely need a tune, since the existing tune will not be optimal. Why don't you install the turbo kit together?

05-21-2018, 09:48 PM	#4
Lantanafrs2 Senior Member Join Date: Jan 2018 Drives: 2013 frs red Location: South Florida Posts: 3,517 Thanks: 2,520 Thanked 3,088 Times in 1,654 Posts Mentioned: 6 Post(s) Tagged: 1 Thread(s)	Christ, a stock motor requires a tune.

06-07-2019, 10:55 PM	#7
kimcheefists Member Join Date: Mar 2015 Drives: 2017 BRZ PP Location: Las Vegas Posts: 40 Thanks: 5 Thanked 9 Times in 8 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	I apologize in advance for reviving an old thread but I just wanted to know if a newly built engine should start after only changing the compression ratio without a new base map. My car has been in the shop getting forged internals for the past couple months and now will not start..

06-08-2019, 03:34 AM	#9
Lantanafrs2 Senior Member Join Date: Jan 2018 Drives: 2013 frs red Location: South Florida Posts: 3,517 Thanks: 2,520 Thanked 3,088 Times in 1,654 Posts Mentioned: 6 Post(s) Tagged: 1 Thread(s)	More like the amplifier box

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