More low end power
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More low end power
Hello, I have an 07 FX4 4.0 with a 5spd manual tranny. I was wondering if there was anything I could do to get more low end power. It doesn't seem to start gettting out of its own way until it hits about 2000 rpm +.
Thanks for any input.
Lynch
Thanks for any input.
Lynch
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Joined: Feb 2007
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From: Aurora
Hey Lynch, and welcome to the forum. You'll like it here and it's great to have someone else with an O7. I've got the exact same setup and you're right, for now (from what I've been told). She seems to lug at around 1500 which I'm not accustomed to. They take a few thousand miles to break in and I've been reassured by a few people so far that they improve in both performance and mpg's with break in.
It's the opinion of several folks that the 4.0 SOHC is not the best engine for a truck. They do like to rev and she really opens up at around 3-4k. The red line is supposed to be around 5500 rpm (correct me fellas if I'm low), but there's no indication on the tach. I often find myself cruising in 3rd at 30 mi/hr through town just because she feels better there.
There is a torque tune ( the tuner comes with three tunes) that you can get from Superchips on their Bama tuners, but your warranty may be affected depending on the dealer and laws regarding it.
BTW Lynch, how's she idling?
Fred
On edit. Did your FX4 come with the rear sway bar?
It's the opinion of several folks that the 4.0 SOHC is not the best engine for a truck. They do like to rev and she really opens up at around 3-4k. The red line is supposed to be around 5500 rpm (correct me fellas if I'm low), but there's no indication on the tach. I often find myself cruising in 3rd at 30 mi/hr through town just because she feels better there.
There is a torque tune ( the tuner comes with three tunes) that you can get from Superchips on their Bama tuners, but your warranty may be affected depending on the dealer and laws regarding it.
BTW Lynch, how's she idling?
Fred
On edit. Did your FX4 come with the rear sway bar?
Last edited by fflintstone; Jul 2, 2007 at 04:11 PM. Reason: forgot about sway bars
Post Fiend
Joined: Jul 2005
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From: Durant, OK (SOSU)
As Fred said, low end torque tunes are available, other than that there isn't just a quick fix that gives you more low end torque.
Don't follow the shift patterns in the manual (15,25,37,45). Used to if I was cruising at say 45 MPH...I'd shift into fifth. I've now started leaving it in fourth, keeping the RPMs up, and both my mileage and available power (aka fun factor) have significantly increased.
Don't follow the shift patterns in the manual (15,25,37,45). Used to if I was cruising at say 45 MPH...I'd shift into fifth. I've now started leaving it in fourth, keeping the RPMs up, and both my mileage and available power (aka fun factor) have significantly increased.
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Joined: Jul 2006
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From: Denver
My experience is that you will get better performance and better mileage if you keep the rpms above 2000.
Here again is the published torque curve for both ohv and sohc:
And, here is actual data from my truck after well broken in (73k miles):
NOTE: The blue curve is the one to look at - that's stock tune. The red curve is with the blower. The point is that the low end torque is much better than published values after it gets worn in for a while.
Keep in mind that the first graph is published flywheel data, and the second graph is tested rear wheel data. In the manual trans Ranger, there is around 15% driveline losses. So, the tested 183 hp and 210 lb-ft correspond to 215 hp and 247 lb-ft at the flywheel (slightly better than Ford's published numbers), and for your 'what if' dreams, with the blower the 251 lb-ft (I got that on a different dyno run) and 215 hp correspond to 295 lb-ft & 253 hp at the flywheel!
Here again is the published torque curve for both ohv and sohc:
And, here is actual data from my truck after well broken in (73k miles):
NOTE: The blue curve is the one to look at - that's stock tune. The red curve is with the blower. The point is that the low end torque is much better than published values after it gets worn in for a while.
Keep in mind that the first graph is published flywheel data, and the second graph is tested rear wheel data. In the manual trans Ranger, there is around 15% driveline losses. So, the tested 183 hp and 210 lb-ft correspond to 215 hp and 247 lb-ft at the flywheel (slightly better than Ford's published numbers), and for your 'what if' dreams, with the blower the 251 lb-ft (I got that on a different dyno run) and 215 hp correspond to 295 lb-ft & 253 hp at the flywheel!
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Thanks for the info from all of you. Seems I could be in for a long haul getting the truck broken in as I don't really put alot of miles on my vehicles (about 6500 a year). I was glad to hear that other rangers are the same so its not something wrong with the truck. Before this truck I had a 97 ranger 4x4 3.0, that truck was great on low end and slugish on high end. What a differance.
Posting Guru
Joined: Mar 2005
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From: Dexter, MI
Yesterday I put an Advanced Flow Engineering air filter in my truck and today I was able to pull a grade at 65 mph in 5th gear the I used to have to downshift to fourth gear after I couldn't hold it to even 55 mph. That sure helped the torque for me and it was a simple upgrade.
By the way, Rubydist, where did you find the Ford published power curves? I'd really like to get ahold of power curves for my 91 4 cyl.
By the way, Rubydist, where did you find the Ford published power curves? I'd really like to get ahold of power curves for my 91 4 cyl.
