2 Drivers - One CVT

SamT83 · Nov 28, 2007, 04:08 PM

Alright, so we all probably know the CVT is a learning transmission, right? In time, it will learn your driving style and adapt to it to deliver an optimized experience. This isn't the position I'm in, but say someone out there buys a car with CVT, and driving time is split between two drivers (a husband and wife, for example). Let's also say that these two drivers have two very different driving styles. Does the CVT take both driving experiences and translate them into one somewhere in the middle? My thinking is that this could be somewhat frustrating to perhaps both drivers if it never seems to adjust properly to their style of preference. Anyone have any thoughts or perhaps in this situation?

**krnkimchi702** · Nov 28, 2007, 04:42 PM

Quote:

Originally Posted by SamT83

Alright, so we all probably know the CVT is a learning transmission, right? In time, it will learn your driving style and adapt to it to deliver an optimized experience. This isn't the position I'm in, but say someone out there buys a car with CVT, and driving time is split between two drivers (a husband and wife, for example). Let's also say that these two drivers have two very different driving styles. Does the CVT take both driving experiences and translate them into one somewhere in the middle? My thinking is that this could be somewhat frustrating to perhaps both drivers if it never seems to adjust properly to their style of preference. Anyone have any thoughts or perhaps in this situation?

hmm thats interesting yeah i was thinking about the same thing b/c i let my g/f borrow the car and she is very careful with the car and doesn't drive the way i do... so thats interested...

SLVROZ_03 · Nov 29, 2007, 01:57 PM

Doesn't the Evo have like around 5 to 6 different maps within the ECU? Could those translate different drivers? Very technical question...but a good one.

evo_soul · Nov 29, 2007, 06:20 PM

When you look at the 08 CVT, the car has 2 ECU's or 2 brains.

Your ENGINE / Emissions control ECU and your CVT ECU

Your CVT is rather intellegent, it can pickup very quickly on your habits, if your person who rides the Gas and brakes constantly or if your the passive, coasting type. The CVT will position it self to anticipate your habit, making power availible more quickly, the use of more agressive engine breaking profile or more neutral.

I was rather impressive with this CVT vs. older cvts on other cars.

The CVTs controls are more noticible after a exhaust upgrade. If your going to test drive a car, try to find a friend or somoene you know that has an exhaust upgrade. Assuming its done correctly of course. avoid some that use a straight thru 2.75 or larger profile. The loss of too much backpressure is not good. it must be balanced, or you will have emissions issues, or running to lean or too rich, or just lack of power in parts of your power band.

Hope that helps

**krnkimchi702** · Nov 29, 2007, 08:32 PM

Quote:

Originally Posted by evo_soul

When you look at the 08 CVT, the car has 2 ECU's or 2 brains.

Your ENGINE / Emissions control ECU and your CVT ECU

Your CVT is rather intellegent, it can pickup very quickly on your habits, if your person who rides the Gas and brakes constantly or if your the passive, coasting type. The CVT will position it self to anticipate your habit, making power availible more quickly, the use of more agressive engine breaking profile or more neutral.

I was rather impressive with this CVT vs. older cvts on other cars.

The CVTs controls are more noticible after a exhaust upgrade. If your going to test drive a car, try to find a friend or somoene you know that has an exhaust upgrade. Assuming its done correctly of course. avoid some that use a straight thru 2.75 or larger profile. The loss of too much backpressure is not good. it must be balanced, or you will have emissions issues, or running to lean or too rich, or just lack of power in parts of your power band.

Hope that helps

whats the optimal pipe size for the exhaust?? ive been told its around 2.5

evo_soul · Nov 30, 2007, 06:39 AM

From what my guys are telling me, the 2" opening up to 2.25" is fine. The smaller piper doesnt exactly = bad for flow. Now if your engine has more fire in the belly then i suggest moving up to 2.5" Turbo kits. But Its not a good idea to go wide open straight thru with a large diameter pipe or you will end up hurting performance in the right places.

To the average car user / weekend enthusiest performance mods that beef up low end Torque should be the top priority. More so for the CVT person then the Manual, its very hard to drive your car below 2000RPM , while a good optimized CVT can make use to a fixed RPM position.

After changing the piping over to a second configuration for my dual exhaust, the ultra low end just below the true power band is making great power.

Although i stress the majority of the problem is with the stock muffler. I will post some pics, we found the sharp pipe turn matched with a balanced 2.25" pipe size increase at the turn caused more performance vs. other pipe configurations leading up to the muffler inlet

SamT83 · Nov 30, 2007, 06:51 AM

So, assuming bone-stock, would a good CVT be making those adjustments each time someone drives the car according to how they're driving on that particular trip? Or is it something it comes up with as an "average" so to speak of all the times it's been driven?

evo_soul · Nov 30, 2007, 06:53 AM

trust me, the problem is more with the muffler not pipe size or shape. Mitsu did a great job with the pipe, but had to balance the sound off with a super restrictive muffler.

early performance tests says that this 4th pipe configuration made more power then all the rest we tried, even the straighter 2" pipe line up for the muffler inlet.
So the right bends and size in the right areas can have a drastically different result.

And i thought my friends computer model was all for show. lol bastard was right.

And yes they let me try to weld this one on, lol you can tell i am a noob with the torch lol.

**krnkimchi702** · Nov 30, 2007, 10:33 AM

ahhh this is going soo off topic.. but last question are one of those pictures stock and one with the dual exhaust?? i believe u b/c when i looked under i thought to my self wow the piping is very nicely done..

evo_soul · Nov 30, 2007, 03:27 PM

Quote:

Originally Posted by krnkimchi702

ahhh this is going soo off topic.. but last question are one of those pictures stock and one with the dual exhaust?? i believe u b/c when i looked under i thought to my self wow the piping is very nicely done..

No its not so far off topic, the main point was if you do a CVT ,you gotta get a exhaust upgrade for better drivability.

They are both pictures of the dual exhaust, the stock piping in this configuration is 95% maintained. This option would be best for those who wish to install a dual exhaust as easily as possible. For a custom exhaust shop that is. there will be some welding required. But generally easy.

And that piping isnt that nice, haha you have no idea how many times i F*&#$( with that pipe to get it right.