I purchased an A/T last year and I am now wanting more power, and obviously speed. Why are manuals faster than automatics? Is there anything that can be done to make the A/T just as fast, if not faster, than an m/t?
__________________ 2008 Honda Fit Sport (AT)
****Current Mods:*****
Tint
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JDM Depo Smoked Tails
SSR Intake
All Weather OEM Floor Mats
Endura-Tech Coilovers
Black Painted OEM grill
The engine is the same. An auto "slips" some to make the transitions smoother. MTs, in general, will always be faster and get better MPG. The time to ponder this issue, MT VS AT, is prior to the purchase!
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08 BBP MT absolutely stock!
Getting 38MPG with "moderate" hypermiling. Going for 40!
A/Ts have more drivetrain loss through the use of a torque converter. That, coupled with more weight means the car has less power with which to move the higher weight.
Even with the paddle shifters, the Fit is nowhere near as fun to drive as a M/T equipped version.
The Mini Cooper S AT, is faster then the Mini Cooper S MT.
Anyway, as for the Fit thats not the case.
I say get intake, and full exhaust. That will help the power. Also headers may give you some gains too.
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No more Crotas. . .
would a catback exhaust give me more gains than a header?
__________________ 2008 Honda Fit Sport (AT)
****Current Mods:*****
Tint
Blue LEDs in footwells
JDM Depo Smoked Tails
SSR Intake
All Weather OEM Floor Mats
Endura-Tech Coilovers
Black Painted OEM grill
In a manual-equipped fit, the losses are as follows:
-inertia of roughly 18 lb flywheel and the clutch, which is much lighter than the flywheel
-bearings, which is almost negligible
-five gearsets, and whichever one is selected gives the most friction of the 5
-differential ring gear on countershaft, and its bearings.
In an automatic, the losses are as follows:
-inertia of flexplate and torque converter, similar to flywheel-clutch assembly
-inertia of transmission fluid in torque converter (if similar to civic, 3 quarts), roughly 10-12 lb concentrated at the outermost ring of the converter
-bearings
-fluid pump that maintains transmission fluid pressure, shouldering the work of holding the clutches
-planetary gearset
-differential and its bearings.
The two MAIN losses in the automatic are the fluid mass of the torque converter and the fluid pump. In a manual, it's all just friction of moving parts and that's it. If you wanted to mimic an automatic, you could just double or even triple the flywheel weight and you could be close performancewise.
Now about all those who claim it's the slipping of the converter, well sorry that's not it. That is actually the only saving grace of the automatic. The torque multiplication that it gives when not in lockup before stall speed is where all the grunt off the line comes from. Think about it-- ever floor a manual fit from idle? It takes a while before it decides to move on down the road, but the automatic gets with the program.
But, you can rev the manual and slip the clutch to get the same effect, so...
^^^What he said. As well as this: The auto tranny in the Fit was never meant to enhance performance, but instead to make the car easier to drive for folks who can't handle three pedal driving. The Fit is, after all, an ECONOMY car (thats fuel economy) The auto also won't hold gears as long in auto mode or continuously bounce off the rev limiter like you can in a manual, although the power advantages of bouncing off the fuel cut are very limited. Road and Track did manage to shave a few tenths off their 0-60 time by shifting with the paddles in sport mode. To make the auto faster than a manual you'll want to get a T1R turbo and then put the car on a serious diet, that oughta do it!
__________________ Mods so far: Tint, HID independent fogs, Zeta dash, door trim, non-folding armrest, dead-pedal, accessory aluminum shift knob, A-spec CAI, Tanabe Touring Medallion axle-back, DIY rear bumper strip, XM radio, painted calipers and engine cover Ford blue, Vent-Visors, polished intake runners (Fitfreaks 1st) DC Sports header car purchased 6-21-08 who me addicted?
The engine is the same. An auto "slips" some to make the transitions smoother. MTs, in general, will always be faster and get better MPG. The time to ponder this issue, MT VS AT, is prior to the purchase!
yep. also, in the fit, the auto has taller gearing.
Neither the A/T or M/T Fit is going to be fast unless you go FI. The Fit just wasn't designed to be a sports car. You can make the car a little faster and more enjoyable to drive with a few mods though.
__________________ '98 Milano Red Ej8 Squad #226, retired. Thieves :thumbdown: Honda, The Power of Dreams Nikon User
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At has different gearing and eats more power from the engine.
I think an AT will, depending on make and model, sap 15-20% of the total crank output, whereas a MT will sap only about 15-10%.
__________________ 2007 NBP Fit Sport MT Honda Floor Mats || Honda Cargo Net || 35% tint || custom CAI || Blox shift knob || LED dome + cargo lights || Megan axle-back || Zeta dead pedal || "Dirty White Boy" air freshener :-D
at least on the MT you can force the car to chirp or even spin the tires
if you need to pull off line real quick. but the AT can catch up to you
between your 1-2 shift if you're not fast.
__________________ 08 FitSport Storm Silver Metallic (5MT)
Suspension: EnduraTechs
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