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Custom Dodge Ram Performance Mods - Engine - 4.7 Liter V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 4.7-liter V8 engine - 310 horsepower, 330 lb-ft of torque.


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  #1  
Old 09-30-2011, 10:34 PM
Greybeard52 Greybeard52 is offline
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Default Am I expecting too much from the mods?

I was having trouble towing my 18 foot travel trailer with my 09 4.7L TRX Ram. I added mods per the suggestions from this forum. K&N CAT; Superchip Flashpaq and Flowmaster, Super 20. I finally had a chance to go somewhere with my trailer last week and it still doesn't seem to have the pulling power I want. I live in Wyoming and went to Bozeman, MT. There are some pretty steep hills along the way and the truck still had to kick up to 4,000 rpms without AC on, to get up the hills at 65 mph. Maybe I'm expecting too much from a 4.7L with our big hills, which in some states would be considered mountains. Someone suggested earlier switching out the rear axle. The TRX comes with the 3.92 axle ratio rather than the stock 3.55 ratio. I hate to spend the extra money for a hemi or diesel and I love this truck. What do you think, is 4,000 rpm climbing a hill normal or??? Thanks for any feedback. BTW: I had the Superchip programmed for towing.
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  #2  
Old 10-01-2011, 12:48 AM
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snrusnak snrusnak is offline
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More info.....how much does what you're pulling weigh? And are you single cab/quad cab/....etc....?

It won't get much better for you than what it is with the CAI, exhaust, and mainly the flashpaq on tow tune....with these you are basically as powerful as the older hemi...and with 3.92's you shouldn't be having much issue. Need to know the weight of the pull though...

I'd guess that anything over 6,000lb you'd be better off with the hemi....anything under 6,000lb you should be able to manage. The 4.7L unfortunately doesn't have a ton of low end torque, it makes its torque and power at higher rpm. 4,000 rpm isn't too bad if it's not for extremely long periods of time...also what speed are you towing at? You really shouldn't tow at above 65mph, and if you have a really heavy load, probably more like 60mph...
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Old 10-01-2011, 02:11 AM
Gene K Gene K is offline
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11,000 lb GVW (Estimate) + 100 sq ft of frontal area (Estimate) + 5,000' of altitude at 65 mph = 4,000 rpm.

At 2700 rpm (3rd) even with the mods its making around 140 bhp at that altitude. It needs the 4000 rpm in 2P to put it up around 225 bhp to move that load.

For the record my 4.7L (3.55 with shorter tires) downshifts to 3rd to maintain speed when empty on steep hills at 65 mph even at only 400' ASL.
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Old 10-01-2011, 02:14 AM
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snrusnak snrusnak is offline
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So you're pulling about 6,000 lbs. Should be doable. I think 3.92 would help you a lot, but if you swap you might as well go to 4.10...

Again though if it's not working out for you it may actually be cheaper and easier to swap to a hemi....I'd say you're at the limit for pulling that weight on steep hills especially if you do it often...
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Old 10-01-2011, 02:22 AM
Gene K Gene K is offline
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Quote:
Originally Posted by snrusnak View Post
So you're pulling about 6,000 lbs. Should be doable. I think 3.92 would help you a lot, but if you swap you might as well go to 4.10...

Again though if it's not working out for you it may actually be cheaper and easier to swap to a hemi....I'd say you're at the limit for pulling that weight on steep hills especially if you do it often...
I think you are confusing me with the original poster. I was simply explaining why expecting it to do the job with only 140 bhp was asking a lot. His truck already has 3.92 Gears along with LT275/70R17 Tires if they are original.
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Old 10-01-2011, 02:28 AM
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snrusnak snrusnak is offline
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oh sorry lol! I was gonna say...I thought he said he had 3.92 already! lol...
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Old 10-01-2011, 09:19 AM
Greybeard52 Greybeard52 is offline
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Thanks. I made the post and went to bed last night. My trailer is about 5500 lbs. The Dodge dealer and the trailer dealer said my truck should pull okay and it does on flats. I can set the cruise and I'm doing 65 mph at 2500 rpm. But when I hit the hills it kicks up to 4000 or 4500 rpm until I crest the hill. I just worry that was too much load on the engine. I run 65 mph typically with AC off. What do you think about me running 4000 rpm uphill with the AC on with the trailer? Sometimes it gets in the 90's even in Wyoming and Montana. Is that going to hurt anything? I have the Heavy Duty Engine and Transmission Cooler on my truck. It's an 09 TRX 4.7L, 3.92 Axle Ratio with the All Terrain Tires, which came stock with the TRX pkg. Thanks for the feedback. It's very helpful. Also, it is a crew cab.

Last edited by Greybeard52; 10-01-2011 at 09:22 AM.
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Old 10-01-2011, 09:33 AM
M n M M n M is offline
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I'm no expert on towing by any measure but it seems that the only thing left to do to help her pull better would be a different gear ratio. Thats my unprofessional advise.
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Old 10-01-2011, 09:45 AM
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snrusnak snrusnak is offline
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I don't think you'd have any issues at all with engine overheating, the truck has a mechanical and electric fan. I'd monitor your transmission temp as it may rise a bit, but these trucks transmissions tend to run on the cool side compared to other trucks. If the trans temp starts going above 200 deg a lot then I'd start being concerned. If it peaks near 200 while climbing hills then goes back down I wouldn't worry about it. Many other trucks(gm's I know for sure) transmissions run around 200deg + even when not towing...

The high rpm's isn't going to kill the engine if it's not for long periods of time...depends though if it's at 4,500 rpm for 5 minutes straight without a break a lot that's probably not real good lol. How fast do you pull up the hills? And how often do you tow?
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Old 10-01-2011, 10:30 AM
Greybeard52 Greybeard52 is offline
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I went to Starbucks this morning and when I got home, I looked at the trailer to make sure I was remembering 5500 lbs correctly. I wasn't. It's 6,000 lbs. Not only do I have a grey beard, but apparently I'm getting old timers disease. To answer your question, I tow the trailer about 3 times per year. This year we went from Wyoming to northern California coast. Lots of mountain passes on this trip. I run 65 mph and I leave the AC off so as not to strain the engine. But it is running at 4,000 rpm all the way when climbing passes and I usuallly slow down to 55 mph just to be safe.
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