What's the verdit?
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What's the verdit?
What is the verdit with the 08-2010 20" wheels with the Hubcentric Spacers. I love the look and did a lot of searchs. Seems to be some concern running spacer with these wheels......What do you think?
I'd love to hear from people who've run this set up as well. I've got the rims already, but don't wanna drop 650 on the spacers if it's a concern.
Thanks!
Mike
I'd love to hear from people who've run this set up as well. I've got the rims already, but don't wanna drop 650 on the spacers if it's a concern.
Thanks!
Mike
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The spacers, if hubcentric, should be no problem.
The problem will be the change in RPM vs. speed with a different diameter tire. You will fall off the torque curve when you decrease RPMs by 7 - 10% for a given speed.
The problem will be the change in RPM vs. speed with a different diameter tire. You will fall off the torque curve when you decrease RPMs by 7 - 10% for a given speed.
Last edited by Forest; Nov 25, 2010 at 04:49 AM. Reason: Meant to say "torque" not "power".
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Thanks-Mike
BTW-That was a great looking X you had....real interested in your latest project as well - keep up the good work!
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Interesting - Some more good info to think about -
Thanks-Mike
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Mike, have you got a diesel? The 6.0L with 5 speed is sitting right on 2000 RPM at 68 - 70 mph with stock wheels/tires. If you go to 20" wheels and stock size tires, you will be running about 1850 RPM. Truck will lug down and have to downshift with a slight headwind/grade when towing a big trailer. Perceived "power" will suffer. Most people claim it is due to heavier wheels. Not true. Problem is change in RPM.
If you want to keep original performance, I think you would have to change differential ratios or have a tuner to adapt to lower RPM operation (get original torque or better at lower RPM).
If you want to keep original performance, I think you would have to change differential ratios or have a tuner to adapt to lower RPM operation (get original torque or better at lower RPM).
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Mike, have you got a diesel? The 6.0L with 5 speed is sitting right on 2000 RPM at 68 - 70 mph with stock wheels/tires. If you go to 20" wheels and stock size tires, you will be running about 1850 RPM. Truck will lug down and have to downshift with a slight headwind/grade when towing a big trailer. Perceived "power" will suffer. Most people claim it is due to heavier wheels. Not true. Problem is change in RPM.
If you want to keep original performance, I think you would have to change differential ratios or have a tuner to adapt to lower RPM operation (get original torque or better at lower RPM).
If you want to keep original performance, I think you would have to change differential ratios or have a tuner to adapt to lower RPM operation (get original torque or better at lower RPM).
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No-this truck is not - it's a V-10. Not really familiar with this v10 set up. When I put the bigger tires on my f250, which is a diesel, I didn't notice a change, but I did't go with drastic overall size...I went from 265/75/20 to a 305/55/20...it's actually 1/2'' lower but a little wider. From what I read, it looks like going from a 16'' wheel with stock size tires to the 20'' wheel with stock tires will increase around 2''....thats a big difference, so your correct in what you say. A tuner will help - hopefully!
The diesels, for fuel economy on the Excursion, operate right at the bottom of the "flat part" of the torque curve. Below 2000 RPM, the torque falls off, so the truck appears sluggish.
I don't know about the V10.
Stock diameter on Excursion is 31.6" = (2*.75*265/25.4+16).
OE size on 2009 F-250, for example, is 275/65/20, which calculates to a rolling diameter of 34.1" (7.7% larger). This means that, at 70 mph, the engine would run at about 92.9% of the original RPM, whatever that is for your Excursion.
If you can tolerate the ride of 55 aspect ratio tires, you might consider a 275/55/20 size, which calculates to a rolling diameter of only 0.8% larger than stock Excursion.
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