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-   -   86 AT vs 86 MT (https://www.ft86club.com/forums/showthread.php?t=24456)

GotM 12-17-2012 11:09 AM

86 AT vs 86 MT
 
2 Attachment(s)
Attachment 22928

Attachment 23003
I did some basic modeling on the acceleration differences between the MT and AT for the twins.

-The MT has a slight advantage over the AT through all gears. The difference in 1st gears is ~1ft/s^2 delta. This is a fairly small difference.

-It looks like shifting at redline is going to give max acceleration. Except the 4th to 5th. But, the crossover is so small I would still use redline.

-I like how the AT goes through 60mph in 2nd, unlike the manual.

-You can see the slight weight advantage (really, really small) by comparing 5th MT and 4th AT.

-No, these cars do not top out this fast. No energy losses are accounted for in this model. I think some where in the 140s would be top speed, based on the 200hp.

Added:
The time to MPH chart. It looks like the MT has a slight edge on the AT after 60mph. But, I think this is too close to claim one is really faster than the other.

Ingen 12-17-2012 12:04 PM

Technical basis for the model?

I'm just curious :)

GotM 12-17-2012 12:22 PM

The model used the following information:
1. Inside-Line dyno chart, at the wheel torque curve
2. Toyota/Subaru published gear ratios, final drive, weight specs.
3. Tire rack - Michelin HP tire specs (revs/mile, & diameter).

Model was a method to normalize to acceleration.

PrDarkKnight 12-18-2012 09:16 AM

did you do any 0-60 on both?

GotM 12-18-2012 10:20 AM

Quote:

Originally Posted by PrDarkKnight (Post 615094)
did you do any 0-60 on both?

I do have some time-to-speed graphs based on this model. But, since there are so many key variables missing, it would not give an accurate time to speed. I think this is better for relative comparisons. I will post the graph of time to speed a little later today.

Eurasianman 12-18-2012 10:28 AM

Really wish the manuals had a taller 2nd gear. I've never had an issue with hitting the rev limiter until this car :(

PrDarkKnight 12-18-2012 11:29 AM

i am wondering also if there is anyone who has done a 1/4mile with the AT in full manual mode with track control of?

Rayme 12-18-2012 11:57 AM

Quote:

Originally Posted by Eurasianman (Post 615169)
Really wish the manuals had a taller 2nd gear. I've never had an issue with hitting the rev limiter until this car :(

I don't, it would make city driving in 2nd gear much shittier.

Kido1986 12-18-2012 12:12 PM

If you want that slightly taller gearing for 60mph in 2nd, up your tire profile 1 size or get a tune that raises the RPM a bit.

carbonBLUE 12-18-2012 12:13 PM

Quote:

Originally Posted by PrDarkKnight (Post 615227)
i am wondering also if there is anyone who has done a 1/4mile with the AT in full manual mode with track control of?

i have, slow as balls 11 second 1/8th mile, 18 second 1/4

eh?

GotM 12-18-2012 12:28 PM

I added the time to MPH chart to the first post. Keep in mind this is for comparison only, and does not represent the time to get to a certain speed. The start is not from 0, but ~11mph.

Eurasianman 12-18-2012 01:49 PM

Quote:

Originally Posted by ottopilot (Post 615256)
I don't, it would make city driving in 2nd gear much shittier.

Would you mind explaining?

Rayme 12-18-2012 02:54 PM

Quote:

Originally Posted by Eurasianman (Post 615390)
Would you mind explaining?

Taller gearing to reach 60 mph (without changing redline) means a longer gear and less torque down low...

basicly it would be much too easy to bog the engine in 2nd.. I had a WRX that didn't like it AT ALL anywhere under 2000 RPM, it would shake the entire drivetrain:mad0259:, so I had to downshift in 1st and it sucks just driving around...or you go around the corner faster:)

PrDarkKnight 12-18-2012 08:51 PM

Quote:

Originally Posted by carbonBLUE (Post 615278)
i have, slow as balls 11 second 1/8th mile, 18 second 1/4

eh?

damn! where you even trying? lo!l My brothers 2.4 lancer GTS does high 15s and I have beat it!


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