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Car Forum / Dodge / Dodge Trucks / November 2005Wheel conversion of '04 CTD
I am going to convert my 17" wheels to 22.5" Alcoa's. This will increase my tire height 6". Is it possible to recalibrate the speedometer 15%? Any help will be appreciated. Steve >I am going to convert my 17" wheels to 22.5" Alcoa's. This will increase my >tire height 6". Is it possible to recalibrate the speedometer 15%? Any help >will be appreciated. > Steve What will that change do to your gearing? Roy >> I am going to convert my 17" wheels to 22.5" Alcoa's. This will >> increase my tire height 6". Is it possible to recalibrate the [quoted text clipped - 3 lines] > > Roy It will probably help if he has 4.10s. 4.10s are way too low.  SignatureKen >>> I am going to convert my 17" wheels to 22.5" Alcoa's. This will >>> increase my tire height 6". Is it possible to recalibrate the [quoted text clipped - 5 lines] > > It will probably help if he has 4.10s. 4.10s are way too low. I don't know 6" is a lot. Have to remember that a Cummins operates best at a certain rpm range. I have no problem with the 4:10's in my truck. Roy >>>> I am going to convert my 17" wheels to 22.5" Alcoa's. This will >>>> increase my tire height 6". Is it possible to recalibrate the [quoted text clipped - 11 lines] > truck. > Roy We really don't know what the final drive ratio will be until he picks out a tire profile. If it ends up being the 15% difference that he quoted, it will make it drive like it had 17s and 3.48:1 rear gears. That's pretty close to the gears that I have. If he were using it for heavy hauling the 4.10s would be a better choice, but I don't think he'd be putting 22.5s on it then. SignatureKen Roy, That will change my 4.10s into 3.55s or 3.65s. Effectively putting 70MPH at 1800 rpm, which will save a lot of fuel. It will make the ride smoother, quieter and increase tire life to more than 200k miles. Additionally, it will add significantly more life to the truck. We are fortunate to have both the brakes and the suspension to handle the mod. The GM product cannot without extensive suspension changes. Unfortuately, it also adds 25lbs in unsprung weight at each wheel, so the shock absorbers should also be changed to gas type. This change will set me back about $5,000 all in though. Steve >>I am going to convert my 17" wheels to 22.5" Alcoa's. This will increase >>my tire height 6". Is it possible to recalibrate the speedometer 15%? Any [quoted text clipped - 3 lines] > > Roy > Roy, > That will change my 4.10s into 3.55s or 3.65s. Effectively putting 70MPH [quoted text clipped - 7 lines] > about $5,000 all in though. > Steve Steve, will your payback be equal to your outlay? Obviously, the "cool factor" has to fit in there somewhere though :^) Mike >>>I am going to convert my 17" wheels to 22.5" Alcoa's. This will increase >>>my tire height 6". Is it possible to recalibrate the speedometer 15%? Any [quoted text clipped - 3 lines] >> >> Roy Mike, Good question. The answer is "I think so." Let's assume I keep the truck for 200k miles, I will save 3 sets of tires for $1,000 plus say a 10% fuel savings, which is 11,560 gallons at 17.3 mpg verses 10,526 gallons at 19 mpg with the difference being 1,000 gal + at say $2.50 a gallon for about $2,500. So, without the cool factor, the better ride, the better gearing, the lower stress on the motor and chassis, potentially yes. But, I think the key to the answer is "How long will I keep the truck?". Steve >> Roy, >> That will change my 4.10s into 3.55s or 3.65s. Effectively putting 70MPH [quoted text clipped - 20 lines] >>> >>> Roy You may save tire wear but I'm betting you will use more fuel. Take into account that the tires and rims are heavier than stock, with the increased ride height you will have a lot more drag on the road. Plus those larger tires will take more fuel to get them moving as well as your ratio change is higher than you have. You will be looking at closer to a 3.00 ratio. Lower RPM isn't always a good thing. I have never seen any 22.5 tire that will give a good ride on a light weight vehicle either. Hope you know a good dentist. If you have ABS your going to have lot's of fun getting it to work correctly with that much rubber as well. Good Luck. SignatureSteve > Mike, > Good question. The answer is "I think so." Let's assume I keep the truck for [quoted text clipped - 30 lines] > >>> > >>> Roy Steve, I have done my homework correctly, depending on the tire size, my height change will be between 3.5 and 6.0 inches. I am running 31s stock. Worst case is 265/70 at 37", but I will run either 245/70 or 2.55/70 at 34.5 and 36" respectively, which is either a11.3% or 14% gear change. I have 4.10s, so the effective gear change will be either 3.649 or 3.530. Please remember that 3.73 is the standard Dodge gear. However, your word of caution will be heeded because both the wheels and tires in that size are not always round and any imbalance or eccentricity will get my undivided attention. On the fuel issue, I have queried others that have made this change and the fuel savings is substantial. Their stated change in consumption is far greater than I'm planning on. In actual fact, the rolling resistance is less with the big wheels as the tire width is only slightly wider than stock, but with a much harder compound. Steve > You may save tire wear but I'm betting you will use more fuel. Take into > account that the tires and rims are heavier than stock, with the [quoted text clipped - 60 lines] > ----= East and West-Coast Server Farms - Total Privacy via Encryption > =---- |
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