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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 07-04-2012, 12:38 PM   #29
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wow runfile15 is nice (170hp)
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Old 07-04-2012, 12:44 PM   #30
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Originally Posted by Visconti View Post
Just saw this!

Thanks for posting this up.

I think the gain is most likely from the advance multiplier increasing allowing the car to run more timing.
I suspect it is a combination of things.

First, I only run shell and chevron 93 octane, so it is likely that the motor is not having to pull any timing for knock response. Toyota's ECUs actually start at Maximum timing, and then they use a long term and short term knock trim to pull timing back out to the currently desired level. You can reset this value by resetting the ecu (disconeccting the battery). Those values both exist in the FRS ECU when viewed with a Toyota Techstream scantool, so I suspect it is the same as the rest in that respect. Now there MAY have been some fuel related timing reduction for the first pull, but it did have 93 in the tank from an Exxon station across from the dealer.

And a good deal of it is from break in. We actually felt a huge difference after we took it to the drag strip at @300 miles or so. We made over 16 runs, and about the first 12 were literally back to back. The next day there was a definite increase in power. I have also seen a corresponding increase in fuel economy even when driving hard.

It should be noted the ambient temps were warmer on the more recent pulls as well.
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Old 07-04-2012, 12:45 PM   #31
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wow runfile15 is nice (170hp)
we had one run that was even higher, but this one was the closest to the middle of the pulls we did this time around.
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Old 07-04-2012, 02:02 PM   #32
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So, this means ~15% drivetrain loss assuming the engine is truly putting out 200hp at the crank?

Not too shabby. Eh?
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Old 07-04-2012, 02:21 PM   #33
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Quote:
Originally Posted by Boosted2.0 View Post
I suspect it is a combination of things.

First, I only run shell and chevron 93 octane, so it is likely that the motor is not having to pull any timing for knock response. Toyota's ECUs actually start at Maximum timing, and then they use a long term and short term knock trim to pull timing back out to the currently desired level. You can reset this value by resetting the ecu (disconeccting the battery). Those values both exist in the FRS ECU when viewed with a Toyota Techstream scantool, so I suspect it is the same as the rest in that respect. Now there MAY have been some fuel related timing reduction for the first pull, but it did have 93 in the tank from an Exxon station across from the dealer.

And a good deal of it is from break in. We actually felt a huge difference after we took it to the drag strip at @300 miles or so. We made over 16 runs, and about the first 12 were literally back to back. The next day there was a definite increase in power. I have also seen a corresponding increase in fuel economy even when driving hard.

It should be noted the ambient temps were warmer on the more recent pulls as well.
Although that might be the case for Toyota ECUs this is not the case for Subaru - the ecu in these cars.

After ecu reset the car does not run maximum advance. Car needs to e given a drive cycle and go thru some things in order for the advance multiplier to jump up allowing maximum advance.

By default the advance multiplier is at .7. Car won't see full advance until the advance multiplier jumps up to 1.0

John
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Old 07-04-2012, 03:16 PM   #34
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I thought they both use Denso?
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Old 07-04-2012, 03:41 PM   #35
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Not bad numbers at all.
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Old 07-05-2012, 12:37 AM   #36
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I wonder if a full exhaust on this car would raise the HP from
170 to maybe about 5-10 more horses or just stay the same ?
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Old 07-05-2012, 01:35 AM   #37
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Quote:
Originally Posted by Visconti View Post
Although that might be the case for Toyota ECUs this is not the case for Subaru - the ecu in these cars.

After ecu reset the car does not run maximum advance. Car needs to e given a drive cycle and go thru some things in order for the advance multiplier to jump up allowing maximum advance.

By default the advance multiplier is at .7. Car won't see full advance until the advance multiplier jumps up to 1.0

John
Is the table temp based? Or load based? Interesting...
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Great info in here. arghx7 what do you do?

He's obviously a very knowledgable landscaper.
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Old 07-05-2012, 12:00 PM   #38
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Quote:
Originally Posted by Boxer-Guy View Post
I wonder if a full exhaust on this car would raise the HP from
170 to maybe about 5-10 more horses or just stay the same ?
haven't been reading much, Nameless has seen >20whp from their full exhaust and Vtune has another 18wp gain from tuning, I'm sure if you tuned in the full exhaust and an intake you could see >40whp gains
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Old 07-05-2012, 01:53 PM   #39
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Originally Posted by ImAwesome View Post
haven't been reading much, Nameless has seen >20whp from their full exhaust and Vtune has another 18wp gain from tuning, I'm sure if you tuned in the full exhaust and an intake you could see >40whp gains
That would be incredible; same lvl of gain seen from the K20 in my RSX-S.
I would be seriously impressed with the boxer & DI if it could manage that =D
Here's to hoping for the best results!
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Old 07-05-2012, 01:54 PM   #40
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Quote:
Originally Posted by Koji_Online View Post
That would be incredible; same lvl of gain seen from the K20 in my RSX-S.
I would be seriously impressed with the boxer & DI if it could manage that =D
Here's to hoping for the best results!
Would be VERY awesome
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Old 07-05-2012, 02:38 PM   #41
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Quote:
Originally Posted by Visconti View Post
Although that might be the case for Toyota ECUs this is not the case for Subaru - the ecu in these cars.

After ecu reset the car does not run maximum advance. Car needs to e given a drive cycle and go thru some things in order for the advance multiplier to jump up allowing maximum advance.

By default the advance multiplier is at .7. Car won't see full advance until the advance multiplier jumps up to 1.0

John
unless of course, you set the advance multiplier to 1 through a tune.
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Old 07-05-2012, 05:12 PM   #42
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Quote:
Originally Posted by ImAwesome View Post
haven't been reading much, Nameless has seen >20whp from their full exhaust and Vtune has another 18wp gain from tuning, I'm sure if you tuned in the full exhaust and an intake you could see >40whp gains

It would be awesome if a tune by it self would offer just 20-25whp.
We just have to wait and see.

Oh and thanks for message Boosted2.0
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