Toyota Innova Owners & Discussions [ARCHIVED]

**jaeger** · September 14th, 2005 04:12 PM

*larshell, sorry to butt in but when you changed your tire, your mileage should improve theoretically. I used the tire size calculator (stock tire vs. new tire, use metric) here's the link : http://www.miata.net/garage/tirecalc.html

stock tire : 205x65R15
new tire : 225x55R17

your new tire is larger (in circumference by 99.9mm) 4.9% thus you cover roughly 5% more distance per tire rotation. You mileage should improve by around 4.9% also (theoretically) under same driving conditions. Also, when your speedometer reads 100 kph, you are actually travelling 104.9kph.

**leinahtan** · September 14th, 2005 04:31 PM

Originally Posted by jaeger

*larshell, sorry to butt in but when you changed your tire, your mileage should improve theoretically. I used the tire size calculator (stock tire vs. new tire, use metric) here's the link : http://www.miata.net/garage/tirecalc.html

stock tire : 205x65R15
new tire : 225x55R17

your new tire is larger (in circumference by 99.9mm) 4.9% thus you cover roughly 5% more distance per tire rotation. You mileage should improve by around 4.9% also (theoretically) under same driving conditions. Also, when your speedometer reads 100 kph, you are actually travelling 104.9kph.

Referring to busy road's post

"I tried to compare Larshell's new wheel diameter from the old one. Parehas naman. I don't see any reason for mileage deviation. Try to visit this site for more info. and clarification: http://www.motioncars.com/archive/t...ial/index3.html"

, computing on the wheel difference between larshell's stock against his new tire reveals an outside diameter difference of 4.9%. Referring to busy road's given article link above, a 0.4% difference of outside diameter is an acceptable difference whereas, an 8% difference will, as the article says, create havoc with the car's suspension and other settings. Question is a 4.9% difference an acceptable difference?

**larshell** · September 14th, 2005 05:13 PM

If my speedometer reads 100kph and im actually travelling at 104.9kph so it means that my mileage will also be affected, so meaning my fuel consumption will increase.
Do i understand it correctly?

**jaeger** · September 14th, 2005 05:39 PM

Originally Posted by larshell

If my speedometer reads 100kph and im actually travelling at 104.9kph so it means that my mileage will also be affected, so meaning my fuel consumption will increase.
Do i understand it correctly?

Nope, your fuel consumption will decrease (improve) since you're covering 4.9% more distance given the same axle rotation.

lienahtan:
I don’t think our suspension will suffer even with a 10% increase in tire size (only if our wheel wells can accommodate them without rubbing). Don’t forget that we’re not dealing with cars here. We’re dealing with our Innovas who happen to be based on a common IMV platform shared by a truck (Hi-Lux) and an SUV (Fortuner). Our suspension systems may have differences but I presume they’re equally built tough and robust.

When you put in bigger (& heavier) wheels and tires (up to 10% bigger), your suspension can take it. It’s your steering parts that gives first – particularly your steering rack ends and tie-rod ends for tugging a heavier load. When they give, then replace them with the rack-ends and rod-ends of the Hi-Lux or Fortuner if they fit. ( I wouldn’t be surprised if we share identical parts with these rigs. That’s what IMV’s all about – parts commonality across different platforms)

I’ve been off-roading with hard-core guys for the past ten years and we got rigs with up to 15% increase in tire size (a ‘94 LC Prado EX5 sporting 285’s from stock 225’s, guess what part gave way first? - rack end).

**larshell** · September 14th, 2005 05:52 PM

*Jaeger, If that is the fact then my new tires will give me fuel savings.
Now my next question is how much fuel i will save/km?

**jaeger** · September 14th, 2005 06:04 PM

Theoretically your mileage should improve by around 4.9% under same driving conditions. This translates directly proportional to fuel savings. But with the new blings, your right foot might get heavier kasi mas-enjoy i-drive since nag-improve yung ride quality mo - then that's another story.

Remember, you keep complaining about how stiff our ride is - truck kasi itong ating Innova. I checked with Ziebart CarSavers - they still don't have softer replacement springs for our Innovas (They were the ones who sold softer springs for the CR-V before).

**larshell** · September 14th, 2005 06:15 PM

*Jaeger, Thanks Bro!

**leinahtan** · September 14th, 2005 06:59 PM

Originally Posted by jaeger

Nope, your fuel consumption will decrease (improve) since you're covering 4.9% more distance given the same axle rotation.

lienahtan:
I don’t think our suspension will suffer even with a 10% increase in tire size (only if our wheel wells can accommodate them without rubbing). Don’t forget that we’re not dealing with cars here. We’re dealing with our Innovas who happen to be based on a common IMV platform shared by a truck (Hi-Lux) and an SUV (Fortuner). Our suspension systems may have differences but I presume they’re equally built tough and robust.

When you put in bigger (& heavier) wheels and tires (up to 10% bigger), your suspension can take it. It’s your steering parts that gives first – particularly your steering rack ends and tie-rod ends for tugging a heavier load. When they give, then replace them with the rack-ends and rod-ends of the Hi-Lux or Fortuner if they fit. ( I wouldn’t be surprised if we share identical parts with these rigs. That’s what IMV’s all about – parts commonality across different platforms)

I’ve been off-roading with hard-core guys for the past ten years and we got rigs with up to 15% increase in tire size (a ‘94 LC Prado EX5 sporting 285’s from stock 225’s, guess what part gave way first? - rack end).

One way to find out is hearing more of larshell's experience regarding his modified rigs.

**mattmatt** · September 14th, 2005 08:53 PM

Any Innova owners who experienced steering wheel wiggle upon application of brake at high speed? say 80-120kph? had this experience, dinala ko sa casa ang they said its the rotor disc, good thing under warranty pa kaya all of you innova owners try to brake at high speed, sa low speed di mo ma feel take note....your comments please!!