The truth about Versa, CVT and Milage

[chano129]

The Versa consist of a new engine develop by Nissan and Renualt the MR1.8DE, which consist of 90 % new parts.This is a extremely strong and durable and reliable engine(not the reliability of the car) because of the components making it up (note the versa doesnot need a temperatue gauge, because the materials are more fictionless).The engine is mated to a 4speed AT or 6speed manual or a virtual 6 speed CVT. The Cvt is the trickest of all to drive, because you donot know which virtual gear the car is in.That is why some drivers have bad milage.The new engine reach or achieve at least 90 % or more of it torque at 2400 RPM so CVT driver are advise to keep rev between 2500- 2600 RPM. Why because if you keep revving out of the 2500 range and go into the 3000 range the virtual gear might be 4 instead of a 6 hence more gas burn.It is like an At/transmission the only difference is that it does not shift.With an AT transmission you will know the gear you are in becasue of the shift and engine sound.I wish Nissan did make a gauge or indicator for the CVT to indicate which virtual gear it is in.For improvement in milage use a higher ro or octane.The Versa is advertise to use 87 but the lower the octane the worst Versa burns, but the higher the octane the better it burns.Ensure that your dealer uses synthetic multigrade oil.And donot be thinking it is only Nissan gone CVT, the new toyota corolla the AXio debut 2008 U.S.A. (already debut in Japan for 2007) will also have CVT as the only automatic choice.To get to know more about Versa seach the web by typing Tiida Or Latio.

[chano129]

Ooh i am sorry the milage for the MR1.8DE is 16.4km/l which calculated to 37.68 mpg and not 17km/l as I post in aprevious post.

[ilusha55]

So there are 6 gears in cvt? I thought they were much more of them. Oh well, all this Nissan bla bla about an infinite number of gears. From what I understand the only difference with a classic automatic is that a transition between gears is smoother 'cause it uses pulleys and not clutch.

But when the car is settling for a constant speed for a certain amount of time, there are as much as 6 speed options for the transmission to be in.

[versabundus]

The CVT does have infinite gear ranges. Some cvts have a manual mode and these usually have six gear choices. The reasoning being that's about all the average driver can handle. Here's a good explanation of CVTs. http://www.autozine.org/techni...t.htm

If you do enough research, you probably wouldn't want one. So beware being too informed.

[ilusha55]

If you do enough research, you probably wouldn't want one. So beware being too informed.

I don't have a choice since it the only auto available for SL models

[chano129]

That passage has some errors.it was subary who applied the CVT then it was nissan who aslo applied it to their Nissan March in 1992 then it was Honda to the 1600 Civic Then Nissan made its own the hyper for the bluebird which has an 2000 cc.It is simple the pulleys make it has the ratio unlike the AT/transmission but it still has six gears only that you can go between them the gears because of the pulleys.for example to over take a vehicle the At/transmission will kick down to from over to the thrird speed but theCVT does not have to go back exactly it can be range between them because of it ability to vary.Hence less fuel use to do your passing.

[LA02MAX]

umm no...the CVT has NO preset gear ratios...hovering at 2400 rpms as opposed to 3000 while accelerating has nothing to do with being in different "virtual gears". It has to do with the diameter of the belt loop turning the pulleys that ACT as 'gears' (but are not gears). The belt loop diameter has infinite ratios (within a certain range) that allow it to constantly adjust depending on engine speed/throttle position/accelerator pedal position/load/airflow/etc. The only way you can have preset gear ratios with a CVT is to have the ECU prescribe preset belt loop diameters that, again, ACT as gear ratios. If your engine is turning at 2400 RPMs, of couse the ECU is going to send it less fuel than if it is turning at 3000 RPMs, because obviously each cylinder is hitting TDC 600 less times, therefore the injectors will apply fuel 300 times less per minute at 2400 than at 3000..this is why you will see worse fuel economy with a CVT when acclerating at a higher engine speed than you would at lower RPMs...

[chano129]

umm no...the CVT has NO preset gear ratios...hovering at 2400 rpms as opposed to 3000 while accelerating has nothing to do with being in different "virtual gears". It has to do with the diameter of the belt loop turning the pulleys that ACT as 'gears' (but are not gears). The belt loop diameter has infinite ratios (within a certain range) that allow it to constantly adjust depending on engine speed/throttle position/accelerator pedal position/load/airflow/etc. The only way you can have preset gear ratios with a CVT is to have the ECU prescribe preset belt loop diameters that, again, ACT as gear ratios. If your engine is turning at 2400 RPMs, of couse the ECU is going to send it less fuel than if it is turning at 3000 RPMs, because obviously each cylinder is hitting TDC 600 less times, therefore the injectors will apply fuel 300 times less per minute at 2400 than at 3000..this is why you will see worse fuel economy with a CVT when acclerating at a higher engine speed than you would at lower RPMs...

Who said it was confined to gears, i siad it has virtual gears and it does,you are partly right,but confusing the others, it is still work out to be six gears, gear ratios or no gear ratio, the gear ratio is from 2.4 to .4 , equalling to a range of 6.so you see it has six virtual gears.And donot be fooled it does have effect on driving, if the pulley gear ratio is at 1.5 due to acceleration,it will make the car burn gas,it is like driving a in third speed .Remember that the output from the CVT shaft is connected to another shaft that connects to a different set of gears in the epicyclic. The gear that does not draw power from engine or CVT transfers torque to the transmission output. The gear set acts as a mechanical adding machine to subtract one speed from the other, allowing the car to go forwards, backwards, or neutral. And your wrong at 2500 rpm the Cvt can reaches it maxium range on highways.Acceleration is electrically control.And by the way, there are some preset by computer,varying to suite driving needs, the NISSAN WINGROAD HAS PADDLE SHIFTERS AND IT HAS SIX GEARS, or shift.it is peset it has its pulleys control by a computer programme.And not just your ecu send out message to cut fuel, it is the tps that inform the ecu to send the required amount of fuel,so the cut back of fuel has to do with also your foot.

[LA02MAX]

wow...I know I'm not going to change your mind, and it's pointless to argue on the internet, but everything I said in my post were FACTS.

The only reason the nissan wingroad (whatever the hell that is) has 6 'gear ratios' is because like I mentioned before, the ECU gives the belt 6 preset loop diameters that allow it to FEEL like gears. The nissan maxima and altima CVTs also have this pointless feature.

And yes, I was 100% correct when stating that the ECU triggers the injectors to feed more gas into the cylinders (thus decreasing fuel economy) at higher RPMs. Please learn how engines work to understand what I just said. The only reason you get good gas mileage cruising at 70 mph is because fuel economy is measured by the distance traveled divided by the volume of gas consumed (ie: miles per gallon) and when you're going 70 mph, this offsets the fuel that your injectors are sending to each cylinder. So if your engine is turning at 1800 RPMs at, say, 40 mph you will get worse fuel economy than if you were going 70 mph with the engine turning at 2400 RPMs. If you make one of those factors a control (let's choose to keep the speed constant at 70 mph) but vary the RPMs, the higher the RPMs go, the more fuel your car will consume. It's pure common sense...for every 100 RPMs your engine speed accelerates, your car is injecting fuel into the cylinders 50 more times every minute. The amount of fuel the injectors is also affected by MUCH more than just the TPS. The MAF voltage, TPS, O2 sensors, accelerator pedal position, engine load, engine speed, vehicle speed, etc. ALL affect how much fuel is alotted to each cylinder.

[chano129]

I just want people to get a basic understanding of the CVT,not,a long explaination that others cannot understand,what I was saying is that the AT has set ratio but the CVT has vary ratio,if the AT third is 1.5 and the forth 1.0 the Cvt can fall between that at 1.2 or 1.1 that all i was saying, no need for trying to tell me about it,others donot understand or known.Remember there are females drivers too,i taking every thing into consideration before posting.

[chano129]

If the tps is incorrect how is the computer is going to know the throttle position?The computer would be cconfused and just shooting in petrol. so it is not the ecu it depends the tps, and the o2 mainly telling the computer what to do

[chano129]

even if the you drive at 2400rpm at 70 mph it depends on the tps to tell the computer what to do,a fault tps gives bad milage driving at 2400 rpm at 70mph, so donot tell me about engines, i am an engineer.

[MinisterofDOOM]

The only reason the nissan wingroad (whatever the hell that is) has 6 'gear ratios' is because like I mentioned before, the ECU gives the belt 6 preset loop diameters that allow it to FEEL like gears. The nissan maxima and altima CVTs also have this pointless feature.

While you're correct about how it works, I wouldn't call it pointless. The only way I'd ever be able to live with a CVT is if there was a way to set certain ratios. You need to be able to use the engine for load-braking.

By the way, the Wingroad was a Japanese Nissan station wagon about the size of a G20 or late-90s Subaru Legacy. The newest model is built on the Tiida's chassis, and is a bit smaller than the last model.

[chano129]

Sorry my friend you just insult me,stating i must learn about engine, not very nice at all, if you read my first post you would have Known I do now about engines,I and my friend, have been studying nissan cars for a while and love them(Wingroad is a Japaneese car).he has a bluebird (1993 alitima) with an SR2000cc, but modified wth infiniti G20 parts,it is as fast as a Leux IS200.Me just a sentra, but being around the versa and TIIDA since the Tiida started 2004. So the Versa is not new to us, so let me help so people with their Versa.THat is what the forum is for.peace out.

[Ever Victorious]

Keep it civil, guys.

[LA02MAX]

I just want people to get a basic understanding of the CVT,not,a long explaination that others cannot understand,what I was saying is that the AT has set ratio but the CVT has vary ratio,if the AT third is 1.5 and the forth 1.0 the Cvt can fall between that at 1.2 or 1.1 that all i was saying, no need for trying to tell me about it,others donot understand or known.Remember there are females drivers too,i taking every thing into consideration before posting.

But the point I was trying to make is to not get it into people's heads that the CVT has any kind of gear ratios (imaginary or otherwise) because they really don't. Just explain to them how the belt is able to expand allowing the CVT to continuously adjust (which is why it's called a continuously variable transmission) when explaining it to them.

If the tps is incorrect how is the computer is going to know the throttle position?The computer would be cconfused and just shooting in petrol. so it is not the ecu it depends the tps, and the o2 mainly telling the computer what to do

whoa, sparky. read my post again. I said the TPS is not the ONLY thing that accounts for fuel injection. I also listed the TPS in my long list of things (that aren't even all the factors involved) in determining this.

even if the you drive at 2400rpm at 70 mph it depends on the tps to tell the computer what to do,a fault tps gives bad milage driving at 2400 rpm at 70mph, so donot tell me about engines, i am an engineer.

not sure what point you're trying to make here I think you just misunderstood what I was trying to say. But again, you must realize it's not only the TPS affects how much gas your car consumes (yes, that is an important factor) but there are several others that affect any function the engine performs (whether it be adjusting the electronic throttle plate to allow more/less air volume in to reach a stoich AF mixture or adding/subtracting fuel to do the same)

Sorry my friend you just insult me,stating i must learn about engine, not very nice at all, if you read my first post you would have Known I do now about engines,I and my friend, have been studying nissan cars for a while and love them(Wingroad is a Japaneese car).he has a bluebird (1993 alitima) with an SR2000cc, but modified wth infiniti G20 parts,it is as fast as a Leux IS200.Me just a sentra, but being around the versa and TIIDA since the Tiida started 2004. So the Versa is not new to us, so let me help so people with their Versa.THat is what the forum is for.peace out.

I wasn't, in any way, trying to insult you. I was just stating that it would be a very good thing to really study the way an engine works in order to comprehend how more gas is consumed at higher RPMs. http://www.howstuffworks.com is a very useful site and explains everything in great detail.

[campersand]

I just want people to get a basic understanding of the CVT,not,a long explaination that others cannot understand,what I was saying is that the AT has set ratio but the CVT has vary ratio,if the AT third is 1.5 and the forth 1.0 the Cvt can fall between that at 1.2 or 1.1 that all i was saying, no need for trying to tell me about it,others donot understand or known.Remember there are females drivers too,i taking every thing into consideration before posting.

Ha ha, watch out man, you're in dangerous territory with that last statement. Anyway, I think most people here understand the basics of how the CVT works. I mean, most people who would belong to a forum for a specific car would probably tend to be somewhat educated about said car.

[chano129]

Hey I am keeping it civil, but keep on telling me to go study how engines work , meaning (hey brother you donot know how a engine works.) you are dum to engines. in a decieving manner.

[chano129]

The right thing to do was tell it to the forum, not to address me personal , I DO NOT NEED TO KNOW ABOUT RMPS OR ENGINES,BECAUSE I HAVE ALREADY STUDY THAT AT A UNIVERSITY,what I am studing is what the rpm of nissan versa of 2500 rpm,the torque it produce, the torque converter and the CVT has to do with milage.

[chano129]

thank you for making this forum amazing, where have you reach in your research? I want to know how much miles or km on your clock and your last estimate.

My research so far for the versa is:it can give 40 mpg on highway and 31 city and can average 34 to 35 mpg. 35 at 65 mph and 34 at 70mph.This was done with a car over 1000 miles. this guy think it isn't break in as yet but i think it have. oh sorry, it was a cvt sl.

could you get OKVERSA, what is his latest mpg with his versa.

Versa is diffinitely superb My personal experience was driving a 1500cc not in the use but in Jamaica the car can average an easy 40mpg USA standard and 48 Imperial At high speed of 160 km but this waas not a constant speed. AT/transmission 1500cc

Hey, EVER, the tiida interior features from Japan is better than the Versa. they have park assist sensor,back up camera, navigation, ion air condition, this air condition works like an air purifier, sucks in dust and bad air, gives out good air, and it has a sensor that if it detects bad air from outside, the ducts or ports are closed and it recycle the air in side, if the sensor sense clean air it reopens the ports.The steering wheel and gearshift has antibacterial treatment.

WE COULD ASK NISSAN TO BRING SOME OF THAT FEATURES IN THE 2008 MODELS.

[chano129]

thank you CAMPER, i know people know how it works, with the steel belt driven on pulleys, but alot pf people does not know that it range is still of that of an AT/transmission. 2.4 -.4 ratios.

[chano129]

Now mister moderator sir, with acknowlegdement of you being here, i want to show you why , this guy(lomax) thread miss the whole idea,and partly mislead the forum to only think it is because driving at 2500 rpm you have good mpg,he is correct about the theory of less fuel enter the engine at 2500 rpm,, but that is not the main reason why it is important to drive the VERSA a that 2500rpm, the main reason is the engine was particle design to reach or achieve at least 90% of it torque and power at 2500 RPM, is was design for that purpose for fuel efficiency, and the torque converter is different from the older torque converter, and i think it called: a lock up torque converter.That is why the CVT can reach its maxium range, because of the gears of the CVT in the epicyclic.

[chano129]

I made a mistake it is reaches 90 % of it torque at 2400 RPM.

[Ever Victorious]

Don't nit-pick too much, you just referred to "gears" and "CVT" in the same sentence.

[chano129]

thanks EV, for pointing that out, the gears I am talking about is the tooothed type meshing with one another.

[Jemdawg]

Correct me if I'm wrong, in any aspect, but isn't gas milage dependent on how close you are to the optimal torque/speed rating? Also, there aren't an infinite amount of ratios in a CVT if the ratios must be within a certain range, there are an innumerable amount, but one can define a certain number of ratios in the range, although doing so is arbitrary. The point of a CVT is to eliminate gears and replace them with seamless shifting. Also, keep in mind that not all CVTs are so-called true CVTs, and have actual preset ratios but no physical gears.

I think the point is that a CVT has great potential for good gas milage, but in reality, a CVT is too unpredictable to attain such numbers. A manual transmission allows you to control the ratios, and therefore get, generally, better gas milage. A car with a gas milage computer, a good one of course, should always be equipped in a car with CVT in my opinion, it would help people learn how to drive more efficiently.

[chano129]

This is what my first post should have look like here goes:

Versa's new 1.8 liter MR (MR18) engine (shared with Renault) produces and estimated 120 HP and 125lbs of torque while providing 36mpg on the highway when coupled with the Xtronic CVT (Continuously Variable Transmission). The contemporary engine is a 16 Valve, Dual Overhead Cam, all aluminum light weight block, and that's not all. Nissan has incorporated a continuously variable timing control system to further maximize fuel efficiency and power band at all RPM's. Nissan added an all electronic power steering pump further reducing power robbing drag on the engine. Further, Nissan's engineers incorporate their now ubiquitous "micro-finishing" process to the crankshaft and camshaft, which they claim reduces friction further, helping to ensure a longer-lasting, smoother running precision performance engine.Nissan even went futher to applied one of there newest technology the ultra-low friction diamon like carbon DLC,a though material but smooth to a mirror like finish.It makes the piston rins,piston pins and valve lifters.And of course the valve are made of titanium.

Nissan's Xtronic CVT, as is the case with all CVT's, operates via a pulley system that has an infinite variability between the highest and lowest gears. If you floor the accelerator pedal, the engine's RPM's will quickly climb to maximum engine output and stay steady as the vehicle continues to accelerate and continually change its gear ratios. The improved full efficiency is a result of keeping the car at its optimum power range (2500 RPM) regardless of how fast the car is traveling. What I like most is the elimination of those annoying electronic controlled shifts while in stop and go traffic.

[Jemdawg]

Always remember to cite your sources in MLA format.

[chano129]

I think you got the general idea, for there are other types,correctly said,this specific CVT use in the versa is just a replacement for AT/transmission,which is gone to replace the AT/transmission in the feature, which has a low ratio gear and a high ratio gear, which has pulleys varing between them.And of course the pulleys make a smooth transition while accelerating.I could not have said it better Jemdawg.

[chano129]

Yes the fuel good milage is obtain by it optimal torque ratings, but i as I said before the Engine was specifically design to achieve 90% of its torque at 2400 RPM, that is why it is recommended to drive it at 2500 rpm regardless of speed.The older versions of nissan engines did it at higher rpms