AT vs MT WHP difference - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

JDM4E · 02-21-2018, 11:45 AM

I thought, that AT clutch locks up and the the WHP difference is negligible.
I found only one dyno graph here - http://www.ft86club.com/forums/showp...25&postcount=1

here it shows that it seems my theory is correct, until hi rpm. Why is that? Is that a bad methodology on that dyno run or there is something AT related to that?

Also is there is a info, where the lock up happens? Is it all the time or only on partial throttle etc?

Thanks

mrg666 · 02-21-2018, 12:40 PM

gearing is different?

Tcoat · 02-21-2018, 03:00 PM

Leonardo · 02-21-2018, 03:49 PM

Cannibalism!

via Imgflip Meme Generator

ls1ac · 02-21-2018, 03:57 PM

I do not think the graph is HP related, it should not have a line between points. It is showing ratio per gear. A step or bar not a connecting line, there is no ratio between gears.
Not HP not speed not time.

Dr. BRZ · 02-21-2018, 08:40 PM

An AT twin FBO E85 vs lose to a MT twin just headers and e85. That’s how slow the AT is. Really isn’t worth modding an AT NA wise. If you have an AT, just go turbo.

phrosty · 02-21-2018, 11:07 PM

A Camry will still beat either.

Tristor · 02-21-2018, 11:27 PM

Quote:

Originally Posted by Dr. BRZ

An AT twin FBO E85 vs lose to a MT twin just headers and e85. That’s how slow the AT is. Really isn’t worth modding an AT NA wise. If you have an AT, just go turbo.

Is there some evidence that shows this comparing similar builds AT vs MT on the dyno or something?

tyler_win_photo · 02-22-2018, 12:22 AM

Quote:

Originally Posted by Tristor

Is there some evidence that shows this comparing similar builds AT vs MT on the dyno or something?

Well taking a couple steps back. An AT with headers on pump makes only about 5whp more than a stock MT on pump. The gearing on the AT is longer and not really matched for the low power NA, so the MT would still be faster than an AT with headers.

Once you get into boosted applications the long gearing of the AT pays off as the power is more suited to the power level. That's why you often see boosted MT going from the 4.1 FD to a 3.9 FD or lower.

IceFyre13th · 02-22-2018, 03:02 PM

I am still waiting for an MT twin to keep up with my AT FR-S on the twistiest roads......

Why, because MT drivers miss a shift or two...........

FRS Justin · 02-22-2018, 04:30 PM

your loss of hp is caused by the fluid in your auto trans, to be a little more specific when the fluid passes thru the tq converter to create the input shaft to turn it loses energy. unlike a direct drive manual

Ernest72 · 02-22-2018, 05:41 PM

Just press the gas pedal down a little further and she goes. Stage 2 was a big increase. Straight line speed is slow because of gearing and shifts. Putting into manual mode helps. But if you bought this car for straight-line you are doing it wrong.

Lunatic · 02-22-2018, 06:10 PM

Ive been very happy with my Edelbrock boosted, e-85, automatic FRS. 0 to 60 in 4.9 and I love the way it shifts on the track.

mrg666 · 02-22-2018, 06:22 PM

Quote:

Originally Posted by nikitopo

Have you seen the performance figures of the AT cars? Top speed and acceleration (0-100 km/h). There is a BIG difference ...

Really? I don't know about that but my AT is plenty fast for me

02-21-2018, 11:45 AM	#1
JDM4E Senior Member Join Date: Dec 2014 Drives: Honda Accord Euro Location: Europe Posts: 204 Thanks: 251 Thanked 54 Times in 38 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	AT vs MT WHP difference I thought, that AT clutch locks up and the the WHP difference is negligible. I found only one dyno graph here - http://www.ft86club.com/forums/showp...25&postcount=1 here it shows that it seems my theory is correct, until hi rpm. Why is that? Is that a bad methodology on that dyno run or there is something AT related to that? Also is there is a info, where the lock up happens? Is it all the time or only on partial throttle etc? Thanks

02-21-2018, 03:00 PM	#3
Tcoat Senior Member Join Date: Jul 2014 Drives: 2020 Hakone Location: London, Ont Posts: 69,845 Thanks: 61,656 Thanked 108,283 Times in 46,456 Posts Mentioned: 2495 Post(s) Tagged: 50 Thread(s)	__________________ Racecar spelled backwards is Racecar, because Racecar.

02-21-2018, 03:49 PM	#4
Leonardo Country Boy 4 Life Join Date: Jul 2012 Drives: 19' & 06' Ridgelines, 13' FR-S Location: EUGENE Posts: 5,228 Thanks: 6,719 Thanked 5,291 Times in 2,720 Posts Mentioned: 47 Post(s) Tagged: 1 Thread(s)	Cannibalism! via Imgflip Meme Generator __________________ I LIKE TIRES!

02-21-2018, 11:07 PM	#7
phrosty Senior Member Join Date: Apr 2013 Drives: 2013 FR-S Location: Seattle Posts: 806 Thanks: 202 Thanked 320 Times in 199 Posts Mentioned: 18 Post(s) Tagged: 1 Thread(s)	A Camry will still beat either. __________________ 2013 Whiteout 6AT FR-S \| Perrin Inlet Tube + 2.75" CAI \| OpenFlash Header \| P&L Catback \| 4.88 Final Drive \| Dialed in OFT 2.0x Stage 2 E85 \| 18x8 Enkei Raijin + 225/40 Michelin Pilot Super Sport \| 17x7 Stock + 215/45 Michelin X-Ice Xi-2

02-22-2018, 03:02 PM	#10
IceFyre13th Senior Member Join Date: Jun 2013 Drives: Mazdarati Location: Arizona Posts: 1,238 Thanks: 608 Thanked 1,369 Times in 675 Posts Mentioned: 8 Post(s) Tagged: 1 Thread(s)	I am still waiting for an MT twin to keep up with my AT FR-S on the twistiest roads...... Why, because MT drivers miss a shift or two........... __________________ It's only impossible if you stop to think about it.

02-22-2018, 04:30 PM	#11
FRS Justin Senior Member Join Date: May 2014 Drives: 2013 Asphalt FRS Location: San Antonio Posts: 994 Thanks: 693 Thanked 695 Times in 417 Posts Mentioned: 22 Post(s) Tagged: 1 Thread(s)	your loss of hp is caused by the fluid in your auto trans, to be a little more specific when the fluid passes thru the tq converter to create the input shaft to turn it loses energy. unlike a direct drive manual __________________ Instagram FT86PROJECT9S Facebook FT86PROJECT9S 710whp

02-22-2018, 05:41 PM	#12
Ernest72 Senior Member Join Date: Jul 2016 Drives: 16 Silver BRZ, 04 Silver WRX wagon Location: Rockland county, NY Posts: 1,411 Thanks: 182 Thanked 768 Times in 439 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Just press the gas pedal down a little further and she goes. Stage 2 was a big increase. Straight line speed is slow because of gearing and shifts. Putting into manual mode helps. But if you bought this car for straight-line you are doing it wrong.

02-22-2018, 06:10 PM	#13
Lunatic Senior Member Join Date: Jan 2014 Drives: 2015 Raven FRS Location: Indio, CA. Just an Old Fart in a Automatic!. Posts: 1,614 Thanks: 7 Thanked 1,056 Times in 488 Posts Mentioned: 40 Post(s) Tagged: 2 Thread(s)	Ive been very happy with my Edelbrock boosted, e-85, automatic FRS. 0 to 60 in 4.9 and I love the way it shifts on the track.

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