Whats the rpm difference between 410's and stock. also is a tune needed ?? Thanks [img]style_emoticons/<#EMO_DIR#>/thumb.gif[/img]

 

Like 300 rpm difference at same speed

You need the tuner to recalibrate the speedo/odo. With my predator i just set the axle ratio to 4.10 and go.

 

If I am not mistaken, Ford racing makes a recalibration device for around $90.00. Tuner is expensive but worth it. Not sure how you want your set up to be, but thought I would throw that out there.

 

<div class='quotetop'>QUOTE(fastrek82 @ February 8, 2006, 12:51 PM) Quoted post</div><div class='quotemain'>
Whats the rpm difference between 410's and stock. also is a tune needed ?? Thanks [img]style_emoticons/<#EMO_DIR#>/thumb.gif[/img]
[/b][/quote]

If you have a stick then it is 4.10 / 3.55 = 1.155 or about a 15% increase in rpm at any given mph.

-or-

if you have an auto then it is 4.10 / 3.31 = 1.239 or about 24% increase in rpm at any given mph.

and with a Predator you can correct the speedometer.

The Boss hog

 

<div class='quotetop'>QUOTE(Torrence @ February 8, 2006, 11:08 AM) Quoted post</div><div class='quotemain'>
If I am not mistaken, Ford racing makes a recalibration device for around $90.00. Tuner is expensive but worth it. Not sure how you want your set up to be, but thought I would throw that out there.
[/b][/quote]

your local ford dealer should be able to adjust the speedo calibration for you if you don't feel like spending the $400 for a tuner.

 

Yeah, not much of an RPM difference between stock and 4.10's. Better to go with 4.30's!

 

Like Dustin said, it's about 250 to 300 rpm differance from stock gears to 4.10s.

I have a manual, and at 75 with 3.55s I was at 2250 and now with the 4.10s I'm at 2500.

 

Here you go...

 

That chart is right on. I was taking my salesman out for a romp today to show him the difference between stock gearing and 4:10's and 6000 rpms was 90 mph in 3rd. He liked it! [img]style_emoticons/<#EMO_DIR#>/04.gif[/img]

 

<div class='quotetop'>QUOTE(nonsensez9 @ February 8, 2006, 3:52 PM) Quoted post</div><div class='quotemain'>
your local ford dealer should be able to adjust the speedo calibration for you if you don't feel like spending the $400 for a tuner.
[/b][/quote]

Not on the '05's and '06's. They cannot be adjusted for gear ratio changes or tire sizes due to emissions certifications. You have to use a tuner. On other Fords this was possible, but not on the new cars.

 

By comparison, the 3.55 stock gears turn out about 100 MPH in 3rd at redline, maybe a little more. Gears are about the best SOTP bang for the buck there is. But dangit, I drive too many highway miles for 4.10's, and I don't think going to 3.73's would be worth the $$.

Also, if you do go to 4.10's, plan to get some tires with more grip or you'll lose time spinning at launch, even more so if you get a tune.

 

4.10s and even 4.30s are not bad on the highway..... I think I get better mileage with them becuase I shift to 4th less.... I drive about 60 freeway miles at 75-80 a day..... 5 days a week, and I have 4.30s and I love it.

 

<div class='quotetop'>QUOTE(2005MineralGT @ February 8, 2006, 10:38 PM) Quoted post</div><div class='quotemain'>
Not on the '05's and '06's. They cannot be adjusted for gear ratio changes or tire sizes due to emissions certifications. You have to use a tuner. On other Fords this was possible, but not on the new cars.
[/b][/quote]
you have me confused now. how does the final gear ratio affect emissions?

 

That chart is pretty close. What is the tire diameter of the stock tire? With 3.55 gears I hit the 6250 redline at 105 mph not 108. I always hit redline on 3rd at the last few 200 feet of the 1/4 mile

 

<div class='quotetop'>QUOTE(dustindu4 @ February 10, 2006, 6:31 AM) Quoted post</div><div class='quotemain'>
That chart is pretty close. What is the tire diameter of the stock tire? With 3.55 gears I hit the 6250 redline at 105 mph not 108. I always hit redline on 3rd at the last few 200 feet of the 1/4 mile
[/b][/quote]

The stock tire is 27.18" (or thereabouts). And a tire with some wear will have a smaller diameter than a brand new tire. Let's assume there is 1/4" of tire tread wear. Plug in 26.68" for the diameter, and you'll get 105.8mph

Also, the top speed measured in the quarter-mile is an average over the last 60 feet, so in reality the actual speed at the stripe is slightly higher than the recorded top speed. And keep in mind that the chart is theoretical... drag and gravity will tend to drive the numbers down at higher speeds (I haven't seen anyone go 200mph in one of these yet).

 

Don's chart is right on. I got 4.10's and at 80 mph in 5 gear I'm at 2750 rpm's. Thanks for the chart Don!

 

<div class='quotetop'>QUOTE(nonsensez9 @ February 9, 2006, 5:07 PM) Quoted post</div><div class='quotemain'>
you have me confused now. how does the final gear ratio affect emissions?
[/b][/quote]

It affects emissions because the final gear ratio affects what RPM's the engine is at for a given speed. Since the latest emissions tests are on dynamometers and are tested at certain speeds (15 and 30 MPH), the emissions would be affected (albeit slightly). The cars were only certified for two ratios, the manuals and automatics. Since Ford can't guarantee emissions at other ratios, they won't let you change it anymore.

 

Is anyone sorry they changed to the 4.10?

 

<div class='quotetop'>QUOTE(Mikesstang @ February 10, 2006, 5:16 PM) Quoted post</div><div class='quotemain'>
Is anyone sorry they changed to the 4.10?
[/b][/quote]

[img]style_emoticons/<#EMO_DIR#>/rofl2.gif[/img]

 

<div class='quotetop'>QUOTE(don_w @ February 10, 2006, 5:22 PM) Quoted post</div><div class='quotemain'>
[img]style_emoticons/<#EMO_DIR#>/rofl2.gif[/img]
[/b][/quote]
Yeah, I know.

I am too comfortable with the power of my car as is, you know what that means....

Im gona be jonesin for quite a while cause I cant afford going to the next level.

-Dan