engine dyno! - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

carbonBLUE · 04-21-2012, 05:45 AM

Not bad....

Sport-Tech · 04-21-2012, 10:26 AM

WTH - that can't possibly be WHP/WT. Is the graph an estimate of crank readings? Even if it is, the torque value is still way too high. Looking forward to some expert commentary on this.

czar07 · 04-21-2012, 11:05 AM

that torque graph looks terrible

uspspro · 04-21-2012, 12:18 PM

Quote:

Originally Posted by czar07

that torque graph looks terrible

Ummm look at the scale.

AlmostMDD · 04-21-2012, 12:19 PM

Agreed. Doesn't make any sense. Seems like we get 1100 wasted rpms too. Unless scaling is off somehow.

Dimman · 04-21-2012, 12:21 PM

Is this an actual engine dyno or a normal Dynapack hub dyno converting.
@Scion FR-S: engine dynos measure crank not wheel hp so it would represent the curve associated with the manufacturers numbers.

As for the shape, the scales are just different it's not as wild as it looks.

carbonBLUE · 04-21-2012, 01:20 PM

Quote:

Originally Posted by Dimman

Is this an actual engine dyno or a normal Dynapack hub dyno converting.
@Scion FR-S: engine dynos measure crank not wheel hp so it would represent the curve associated with the manufacturers numbers.

As for the shape, the scales are just different it's not as wild as it looks.

dynapack hub dyno converting, i was drunk and uploaded it last night... lol but those peak tq numbers look good, dip looks like it was for fuel economy...

from the tq numbers it looks like it was designed not to be a dog around town at stop lights(been in a brz and it isnt a dog whatsoever) that dip from 3-4k looks like accelerating fuel economy, 4k to redline looks like performance in mind

Sport-Tech · 04-21-2012, 01:24 PM

So why is peak torque showing at 15 lb-ft over rated? Makes no sense.

Dimman · 04-21-2012, 01:29 PM

Quote:

Originally Posted by Scion FR-S

So why is peak torque showing at 15 lb-ft over rated? Makes no sense.

Because it's a conversion it has to estimate the losses from the flywheel to the dyno.

(It's not an actual engine dyno graph.)

carbonBLUE · 04-21-2012, 01:31 PM

Quote:

Originally Posted by Scion FR-S

So why is peak torque showing at 15 lb-ft over rated? Makes no sense.

inside line got 143 tq to the ground, 165-170 crank tq est is expected

the hp is spot on though

real specs of the engine are ~200 crank hp and ~169 tq and not the 200hp 151 tq advertised, which is a good thing,

kinda like how fords mustang brochure says 412 hp but they dyno in at 398 whp... there's a lot of cars out there under/overrated on hp and tq

and this...

Quote:

Originally Posted by Dimman

Because it's a conversion it has to estimate the losses from the flywheel to the dyno.

(It's not an actual engine dyno graph.)

but i think its good enough estimate....

Dimman · 04-21-2012, 01:46 PM

Quote:

Originally Posted by Scion FR-S

So why is peak torque showing at 15 lb-ft over rated? Makes no sense.

Quote:

Originally Posted by carbonBLUE

inside line got 143 tq to the ground, 165-170 crank tq est is expected

the hp is spot on though

real specs of the engine are ~200 crank hp and ~169 tq and not the 200hp 151 tq advertised, which is a good thing,

kinda like how fords mustang brochure says 412 hp but they dyno in at 398 whp... there's a lot of cars out there under/overrated on hp and tq

and this...

but i think its good enough estimate....

What's funny is I've written PAGES of posts in the Engine Tech thread about how I think this engine should have 170+lb-ft of torque based on comparisons to the old 3SGE BEAMS motor and the D4-S gains on the 2GR. Compression ratio, fuel mixture, intake velocity, BMEP were all considered...

Would be nice to be vindicated, but can't take it from a conversion. Soon maybe.

chulooz · 04-21-2012, 01:55 PM

Proving tq estimates
across engine styles and brands is guesswork or mishandled information. I too would like to see nonconverted figures though.

carbonBLUE · 04-21-2012, 01:58 PM

Quote:

Originally Posted by chulooz

Proving tq estimates
across engine styles and brands is guesswork or mishandled information. I too would like to see nonconverted figures though.

yeah Cobb tuning plano should be getting or already has their brz, hopefully they will do some engine dyno testing

Dimman · 04-21-2012, 02:01 PM

Quote:

Originally Posted by chulooz

Proving tq estimates
across engine styles and brands is guesswork or mishandled information. I too would like to see nonconverted figures though.

Yeah. The high torque on the chassis dynos could come from efficiency improvements in the drivetrain, which is where a lot of development will be spent since those gains can be applied to fuel efficiency gains in ordinary cars too.

04-21-2012, 05:45 AM	#1
carbonBLUE Reverse Burnouts Join Date: Oct 2011 Drives: 2013 Argento FRS Location: dallas!!! Posts: 2,894 Thanks: 707 Thanked 1,257 Times in 592 Posts Mentioned: 30 Post(s) Tagged: 1 Thread(s)	engine dyno! Not bad.... __________________ 2000 Carbon Blue Toyota Celica GTS 152000 miles (wont forget you) 2013 Argento Scion FR-S 2011 Infiniti G37x

04-21-2012, 11:05 AM	#3
czar07 Senior Member Join Date: Sep 2011 Drives: '97 RSP JZZ30 GT-T Location: Australia Posts: 612 Thanks: 365 Thanked 192 Times in 101 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	that torque graph looks terrible __________________ Germans>Japanese>Italians>Americans. Unless its a Corvette.

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04-21-2012, 10:26 AM	#2
Sport-Tech Senior Member Join Date: Oct 2010 Drives: TBD Location: Toronto Posts: 2,583 Thanks: 665 Thanked 685 Times in 386 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	WTH - that can't possibly be WHP/WT. Is the graph an estimate of crank readings? Even if it is, the torque value is still way too high. Looking forward to some expert commentary on this.

04-21-2012, 12:19 PM	#5
AlmostMDD Member Join Date: Apr 2012 Drives: 99 2.5RS Location: Alberta Posts: 22 Thanks: 7 Thanked 6 Times in 4 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Agreed. Doesn't make any sense. Seems like we get 1100 wasted rpms too. Unless scaling is off somehow.

04-21-2012, 01:24 PM	#8
Sport-Tech Senior Member Join Date: Oct 2010 Drives: TBD Location: Toronto Posts: 2,583 Thanks: 665 Thanked 685 Times in 386 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	So why is peak torque showing at 15 lb-ft over rated? Makes no sense.

04-21-2012, 01:55 PM	#12
chulooz Registered you sir Join Date: Feb 2010 Drives: 99 impreza coupe Location: DC / CT Posts: 1,666 Thanks: 259 Thanked 380 Times in 207 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Proving tq estimates across engine styles and brands is guesswork or mishandled information. I too would like to see nonconverted figures though.

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