What I want

"Jake - Has Bad Luck So You Don't Have To" (murdersofa) 06/25/2014 at 12:19 • Filed to: None

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A CVT with a big sliding lever where the gearshift usually is that lets me smoothly change ratios. That way I can put the pedal down, then when I hit the power/torque peak I start sliding the lever forward to change gear ratios so the car stays in that power band.

Now that I say this out loud that seems like it'd be an assload of work, but it'd be fun as hell.

ArmadaExpress drives a turbo outback > Jake - Has Bad Luck So You Don't Have To 06/25/2014 at 12:22

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That could be the new manual of the next generation. Choose your ratio to decide on economy or performance. And of course using it for performance would void the warranty.

mcseanerson > Jake - Has Bad Luck So You Don't Have To 06/25/2014 at 12:23

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Why not just keep the throttle at a set speed and instead of a throttle pedal replace it with a pedal that adjusts the "gear ratio."

Arch Duke Maxyenko, Shit Talk Extraordinaire > Jake - Has Bad Luck So You Don't Have To 06/25/2014 at 12:23

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RamblinRover Luxury-Yacht > Arch Duke Maxyenko, Shit Talk Extraordinaire 06/25/2014 at 12:25

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Also, this:

PS9 > Jake - Has Bad Luck So You Don't Have To 06/25/2014 at 12:27

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I'd just be easier to tune the ECU to keep the engine at [Insert torque peak RPM here] while accelerating.

Jake - Has Bad Luck So You Don't Have To > PS9 06/25/2014 at 12:28

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How much can be done to modern CVT-motive cars by tuning? Could one actually accomplish a "sport mode" and "eco mode" that keeps the engine perpetually at the peak of the power curve or efficiency curve instead of sloppily emulating "gears"?

Textured Soy Protein > Jake - Has Bad Luck So You Don't Have To 06/25/2014 at 12:41

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I hear you can get what you want installed at Pep Boys.

tromoly > Jake - Has Bad Luck So You Don't Have To 06/25/2014 at 12:53

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Uh, that's how a CVT works, in snowmobiles atleast.......

Textured Soy Protein > tromoly 06/25/2014 at 12:55

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Most cars with CVTs work the same as an automatic transmission. Some of them have "manual" modes where you can quasi-shift to certain predefined gear ratios.

Jonathan Harper > Jake - Has Bad Luck So You Don't Have To 06/25/2014 at 12:57

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haha I like this idea

PS9 > Jake - Has Bad Luck So You Don't Have To 06/25/2014 at 12:59

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Not every CVT does the silly gear thing. Most already tune for fuel economy, and Nissan in particular is pretty good at using the CVT behind the (admittedly aging) VQ to extract maximum performance. But also, that's like one car from one company, who also makes the dogshit CVT in the versa, itself not a standout because the industry is awash in dogshit CVTs tuned neither for performance or economy but to protect the cheap-ass fragile components inside.

Give that, I'm not really sure I'd buy a used car with a CVT in it.

tromoly > Textured Soy Protein 06/25/2014 at 14:00

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Yes, however the CVTs used on snowmobiles work by engaging at a certain RPM, where they run at the lowest gear ratio until a certain tuned point is reached, then the CVT changes ratios at a relatively constant engine RPM until the ratios have maxed out, then the engine runs out the rest of its RPM range from there. So basically, it does exactly what the OP is talking about, except automated with springs and clutches.

Textured Soy Protein > tromoly 06/25/2014 at 14:15

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So what you're saying is, the CVT in a snowmobile doesn't let you vary the gear ratio on the fly?

Because what I read the original post to mean is he wants a CVT where instead of the transmission varying the gear ratio through its own means (be that a computer, springs, clutches, whatever) the driver has full control over the gear ratio.

tromoly > Textured Soy Protein 06/25/2014 at 15:35

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A CVT with a big sliding lever where the gearshift usually is that lets me smoothly change ratios . That way I can put the pedal down, then when I hit the power/torque peak I start sliding the lever forward to change gear ratios so the car stays in that power band .

Emphasis mine. What I believe the OP is saying is that he wants a system that instead of having a large step between gears like in a "standard" transmission, he wants a CVT system that basically has infinite ratio steps that increase the gear ratio so minutely and so quickly that it keeps the engine operating at its optimal powerband at all times (i.e. maintains RPM at peak power with very little fluctuation), which is exactly how a snowmobile CVT operates.

The part that is screwy is that the OP wants to maintain his manual transmission aspect by manually selecting ratios, which IMO is a terrible thing to try with a CVT, the constant adjustment will drive the user crazy.