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Old Mar 15, 2018 | 05:21 PM
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More HP?

Hello, I'm new to this forum,and am not very mechanical savvy. I have a 2000 F150 4x2, with 112k miles, ext cab,auto trans,3.55 gear (8.8 axle) , 4.6 V8.
This coming up Saturday I'm having my 3.55 ring and pinion swapped out for a 4.10 ring and pinion.
The only thing that I have done to my truck performance related is have true dual exhaust done along with Borla Pro XS Mufflers installed.

What can I do as low budget as possible to gain at minimum 40-50 hp,of course along with additional torque as well.

I will say that I do tow a utility trailer approx 3-4 day per week in town,and the max load weight including trailer is approx 1,700 lbs.

I would be grateful for your insight!
 
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Old Mar 15, 2018 | 06:33 PM
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you cant gain 40 HP without spending some BIG MONEY... Engine displacement is a CONSTANT.. Adding fuel or air does nothing since the RATIO has to be a fixed value. To get real HP you need more displacement, more RPM ( which you may get with the higher gear ratio) , turbo ( more air in same displacement)...................... air filters, new mufflers, even a tuner will not do much more than a couple HP.
 
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Old Mar 15, 2018 | 06:46 PM
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Originally Posted by steve(ill)
you cant gain 40 HP without spending some BIG MONEY... Engine displacement is a CONSTANT.. Adding fuel or air does nothing since the RATIO has to be a fixed value. To get real HP you need more displacement, more RPM ( which you may get with the higher gear ratio) , turbo ( more air in same displacement)...................... air filters, new mufflers, even a tuner will not do much more than a couple HP.
Thanks for your reply. What kind of money for 40 extra HP?
How about even 25HP extra?
 
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Old Mar 15, 2018 | 08:52 PM
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You don't get those kinds of power increases with cheap easy modifications.
For perspective, a positive displacement super charge offers about 10 HP per pound of boost.
If you want 50 HP it would take 5 PSI of boost.
A super charger install is close to $5000 +/- and reprograming the computer hoping the old engine and trans can take the boost and heavy foot..
Why to you want this much for a truck application that pulls a utility trailer?
You might just wrap that trailer around you neck.
Good luck.
 
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Old Mar 15, 2018 | 10:07 PM
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I'll use the extra power when i'm not towing the trailer. lol
 
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Old Mar 16, 2018 | 08:20 AM
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A lower r&p cheapest way.

Mickey
 
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Old Mar 16, 2018 | 11:45 AM
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Originally Posted by Mickey Bitsko
A lower r&p cheapest way.

Mickey
What is an R&P ?
 
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Old Mar 16, 2018 | 11:51 AM
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Ring and pinion
 
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Old Mar 16, 2018 | 11:52 AM
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Thank you Sir.
 
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Old Mar 16, 2018 | 01:58 PM
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Not sure you can get a 4:30 ring and pinion for an 8.8, might be worth looking into. If you aren't interested in breaking the land speed record, you could go to 4:56 and tow any recommended weight you wanted

Mickey
 
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Old Mar 16, 2018 | 02:37 PM
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Originally Posted by Mickey Bitsko
Not sure you can get a 4:30 ring and pinion for an 8.8, might be worth looking into. If you aren't interested in breaking the land speed record, you could go to 4:56 and tow any recommended weight you wanted

Mickey
I want to keep as much top end as I can. I sometimes hit the interstate,like 1 time per month to visit family. It's a 3 hr round trip. Something I've read a little about is a flex a lite electric fan,and also the pulleys made by BBK. Not as much to gain HP by having these items but allowing the engine to not work as hard.
 
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Old Mar 16, 2018 | 02:59 PM
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You might Google a calculation chart
put in your tire size, stock r&p , final drive ratio on the I assume 4r70. Then play with the desired r&p , might find not that big a deal.

Mickey
 
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Old Mar 16, 2018 | 03:27 PM
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Originally Posted by Mickey Bitsko
You might Google a calculation chart
put in your tire size, stock r&p , final drive ratio on the I assume 4r70. Then play with the desired r&p , might find not that big a deal.

Mickey
I can't seem to figure all that out. Just when I thought I did the numbers don't reflect what I think is correct.
I currenty have auto trans., 3.55 8.8 axle, my tires are
245/70R16 106T 245/70R16 106T
 
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Old Mar 16, 2018 | 03:53 PM
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Call Randy's ring and pinion or Summit Racing, and ask to talk to technical support .
Just tell them what you're trying to accomplish.

Mickey
 
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Old Mar 16, 2018 | 05:14 PM
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your present ratio is 3.55 ............ lets say you are traveling 70 MPH and your motor speed is 2000 RPM..... if you change to 4.10 gears that is 4.10 - 3.55 = .55 or .............. .55/ 3.55 = about 15% .............. 15% of 2000 rpm is 300 rpm ......... so if you put in 4.10 gears, at 70 MPH you would be running 2300 RPM, not 2000. ............... that moves you further up the HP curve and your have more power at 70 MPH ............ like downshifting one gear.
 
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