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Jet program module


09RangerMike

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Ill start off saying i have a 2009 ford ranger xlt 4x4 i just recently installed new tires (32") and new 16" steel wheels. I also cranked the torsion bars a bit to avoid any rubbing of the tires. The problem now is i feel like i lack acceleration and speed. How can i get a bit more power without completely swap my engine for a V8? A friend told me about this jet program module. Does anyone have any positive feed back about tht?
 


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Well when you bumped your tire size up you made it so the engine has to work harder to get the truck going. Changing the gears would be the ideal way to get that pep back, so that the final drive ratio is closer to what it used to be.
 

RonD

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Look on the drivers door edge, you will see a label with stock tire size and also AXLE code
Look here for AXLE code ratio: http://www.therangerstation.com/tech_library/axle_codes.shtml

Common axle(differential) ratio is 3.73
4.10 ratio is better for acceleration and towing power, but has higher RPM at 65mph
3.45 ratio is better for highway cruising, better MPG, but lacks low end power


If stock tire size was 29" and you changed to 32" tires, and you have a 3.73 ratio axle
The axle ratio is effectively changed to 3.38 by the larger tires
So better for cruising but a loss in low end power, acceleration.

The weight of the tires and the amount of power it takes to get them rolling is also a factor, and also to stop them rolling, lol, brakes will wear faster.

To get the 32" tires to work the same as the 29" tires you would need to change the axle ratio to 4.10, this would get you back to the 3.73 "feeling" you had before.
Because it is a 4x4 you have to change BOTH axle ratios

This would also get speedometer/odometer back to reading correctly
At this time(with 32" tires) when speedometer reads 60mph you are actually going 65mph

No, programming won't help much.
What engine do you have?
 
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09RangerMike

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Engine is a 4.0 V6
 

RonD

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You could try running higher octane fuel, the 4.0l SOHC has a knock sensor which retards spark timing when using regular(87 octane) gas.
Although long term it isn't a good option, lol.

4.0l SOHC runs 9.7:1 compression ratio which is how they get the 210 horse power number, so it will ping/knock on 87 octane, the knock sensor detects this, before you hear it, and retards the spark timing to prevent it, this, of course, lowers the power output, but that is better than the alternative, melted pistons and valves.

Did you get your axle ratio?
And stock tire size?
 
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09RangerMike

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RonD said:
You could try running higher octane fuel, the 4.0l SOHC has a knock sensor which retards spark timing when using regular(87 octane) gas.
Although long term it isn't a good option, lol.

4.0l SOHC runs 9.7:1 compression ratio which is how they get the 210 horse power number, so it will ping/knock on 87 octane, the knock sensor detects this, before you hear it, and retards the spark timing to prevent it, this, of course, lowers the power output, but that is better than the alternative, melted pistons and valves.

Did you get your axle ratio?
And stock tire size?
Click to expand...
The stock tire size is 255/79R16. Wasnt sure how to find an axle ratio so i asked around a bit but still done know entirely what it is exactly but they said it can be found on the driver side door sticker but all i read is "axle R6".
 
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The R6 translates to a 3.73 L/S rear end.
Dave
 

09RangerMike

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Thanks dave so since its a 4x4 will the fronf have the same ratio?
 
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