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Just wondering something. Is there usually more power loss through an automatic transimission vs a manual, or is it the same? If it's not, why is that?

 
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because manual is more cool

 
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gearing, time to shift gears, and other things make the time differnce between the autos and manuals.

 
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Ok so it's slower shifting in an auto, that's known, but does that mean it loses more hp through the transmission? or is it just slower accelerating?

 
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well automatics use a hydromatic torque converter and manuals use an actual plate that physically transferrs the rotation from the crank shaft to the gearbox so there probablly is more hp loss

 
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Oooh ok, but it's not THAT much more loss is it?

Does anyone know how much hp the Si (EX in the US) puts out at the wheels?

 
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Horsepower figures are generally 15% loss to the wheels with a manual transmission. And an EX 5spd owns a Automatic, if you get or have an automatic dont expect your car to ever be fast.

 
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gosh all u hate autos.. well my auto has beaten 5speed lx's and ex's.. there are people on this site that have seen me.. and a auto shifts faster then a stick

 
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Your joking right spider??? you think a automatic tranny shifts faster than a manual tranny???

I'll agree with you, the auto shifts faster than some people but there are some people that are able to make a shift quicker with a 5spd than with a auto. It may not be as smooth as a auto but it is faster. Also if you think about it the transitition of the shifts from gear to gear in a automatic is almost always slower than the transitition of shifting gears in a 5spd.

 
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u have never been in a fast auto have u.. thats very sad.. u see when u own a shop and u work on cars u see these things call actual fast cars which include autos... example.. a 89 chevy truck w/ a stage 2 shift kit.. shifts instanly between gears... an expert driver can shift gears in .22-.26 seconds.. the auto does it in .08

 
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spider is correct!!!

Injen

 
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Ok guys calm down here, I didn't intend to start a flame fest. So if the power loss through the transmission in a manual is about 15%, an automatic would be about maybe 20%? Or not that much?

Anyway, putting aside that a manual is faster or whatever, it doesn't mean an automatic isn't fun.

 
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Yes, I modded my previous car's automatic transmission. Shifting between gears was nearly instant. At WOT, 2nd gear engagement was enough to give whiplash to the driver. Damn I miss that car.

 
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ROFL, still owning people I see
Nothings changed lol
BTW spider hows your car comin along? got new pics?

 
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You might want to check out the HX's CVT. Automatic functionality without the loss caused by the torque converter in a normal auto. A couple CVTs here have beat 5-speed EXs.

 
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How did you do that? Is it easy or hard to do?

 
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Now your talking different things, shift kits are not standard or stock options on most vehicles.....The way the person asking the question was talking, he wanted to know stock for stock. Yes definetely aftermarket transmissions, and aftermarket transmission add-ons can make a automatic faster than a manual, that is no argument, but stock for stock not all autos are faster than manuals.

And for the record I used to work for a speed shop called Speed Inc. based out of Schaumburg, IL located right off the Elgin O'Hare expressway, so I do know about fast cars.

 
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Also does it affect reliability any?

 
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It was actually fairly easy, but I had very good directions and had learned from someone beforehand. This was on a Ford AODE. Honda's are supposidly much more difficult. Level 10 will do it for you, but you have to mail them your valve body.

 
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Oh I see, ok.

 
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Yes and no. Reliability for the transaxle should improve due to less heat build-up. Quicker shifts equals less friction. The fast shifts, however, will put more strain on the differential and axles.

 
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Like me for example

 
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Must be nice. For some reason Honda chose not to sell the CVT's here in Canada

Can someone tell me what they sound like? Because I mean I wonder, seeing as it's only like one gear, so does it rev up like a normal car, or is it just a constant sound? I have no clue what I'm talking about as you can see

 
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Sounds just like a car driving around in 1st gear...but with the RPMs going up much more slowly. There's no drop-off in the exhaust note because there are no shifts.

 
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Cool. So it accelerates at the speed of a 5-speed, but the ease of an automatic, cool. I wonder why they don't sell them in Canada...?

 
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Auto and sticks both have thier place. Auto's are used in drag racing because they shift quicker. Manuals are used in road courses because you have more control over how much power is being delivered to the wheels. I myself drive a 5speed because it's just more fun. Untill I have to sit in traffick..then I wish I had an auto. I test drove the mazda6 with the sport auto shifter..that seemed like a decent compromise between the two. But on a stock vehicle..a 5 speed will usually (and I strees usually menaing not always) take an automatic with the same powerplant.

 
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True.

So if there is roughly a 15% power loss through a manual tranny, what would it be through an auto?

 
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If I remember correctly, the auto's on our cars sap roughly 25% of the power. Someone correct me if I'm wrong.

 
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Damn! That's not cool at all. That's 10% more than the manuals.

 
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manual = 9-13% loss and auto = 15-19% loss.. loss changes from gear to gear and how worn clutch and pressure plate in manual