RV.Net Open Roads Forum: Tow Vehicles: Ford 7.3L gas power numbers

RV Blog

  |  

RV Sales

  |  

Campgrounds

  |  

RV Parks

  |  

RV Club

  |  

RV Buyers Guide

  |  

Roadside Assistance

  |  

Extended Service Plan

  |  

RV Travel Assistance

  |  

RV Credit Card

  |  

RV Loans

Open Roads Forum Already a member? Login here.   If not, Register Today!  |  Help

Newest  |  Active  |  Popular  |  RVing FAQ Forum Rules  |  Forum Posting Help and Support  |  Contact  

Search:   Advanced Search

Search only in Tow Vehicles

Open Roads Forum  >  Tow Vehicles

 > Ford 7.3L gas power numbers

Reply to Topic  |  Subscribe  |  Print Page  |  Post New Topic  | 
Page of 13  
Prev  |  Next
Sponsored By:
parker.rowe

Delaware

Senior Member

Joined: 09/14/2015

View Profile


Offline
Posted: 08/06/19 06:41pm Link  |  Quote  |  Print  |  Notify Moderator

I guess people think just because something has pushrods its old outdated technology?

You know overhead cams aren't exactly a new development either, right?

OHC engines designs are almost as old as pushrod setups.


2015 Starcraft TravelStar 239TBS 6500 GVWR
1997 GMC Suburban K2500 7.4 Vortec/4.10 Gears
1977 Kawasaki KZ1000


kellem

Shenandoah valley,VA

Senior Member

Joined: 05/07/2007

View Profile


Offline
Posted: 08/06/19 07:00pm Link  |  Quote  |  Print  |  Notify Moderator

parker.rowe wrote:

I guess people think just because something has pushrods its old outdated technology?


It is old but obviously not outdated. Lol

Vintage465

Prunedale CA.

Senior Member

Joined: 05/02/2015

View Profile


Offline
Posted: 08/06/19 09:02pm Link  |  Quote  |  Print  |  Notify Moderator

That's a cool engine for sure. Nice power and torque ratings VS RPM's. Not giving up my Duramax though........................


V-465
2013 GMC 2500HD Denali. 2015 Creekside 20fq w/450 watts solar. Retiring in 2021, then look-out road, here we come!

RoyJ

Vancouver, BC

Senior Member

Joined: 10/19/2006

View Profile


Offline
Posted: 08/07/19 12:22am Link  |  Quote  |  Print  |  Notify Moderator

dodge guy wrote:

Yes, better gearing will tow better. Glad you now understand!


And with enough gearing (10 spds), two engines of the same hp, one with double the torque, will perform IDENTICAL except right off the line.

I hope you understand that now.

RoyJ

Vancouver, BC

Senior Member

Joined: 10/19/2006

View Profile


Offline
Posted: 08/07/19 12:38am Link  |  Quote  |  Print  |  Notify Moderator

Let's do some math, the Ford 10 speed has the following ratios:

Ratio: 4.6957 2.9851 2.1462 1.7690 1.5201 1.2700 1.0000 0.8536 0.6892 0.6357

From Ford's chart, the 7.3 makes above 400 hp from 4800 - 5800 rpm. In the first 6 gears, those rpm correspond to the following speeds, assuming 4.3 diff ratio and 33" tires:

1: 23 - 28 mph
2: 36.7 - 44 mph
3: 51 - 62 mph
4: 62 - 75 mph
5: 72 - 87 mph
6: 86 - 104 mph

With so many gears, there are very few gaps where the engine isn't making close to peak hp. In fact, from 51 mph and above, the engine is always making 400+ hp, at any speed from 51 - 104 mph.

The "lack of torque" of a big displacement gas engine isn't a concern at all with modern transmissions. At any reasonable towing speed, the transmission has a ratio that allow close to peak hp.

ShinerBock

SATX

Senior Member

Joined: 02/22/2015

View Profile



Posted: 08/07/19 06:30am Link  |  Quote  |  Print  |  Notify Moderator

I thought the only gas truck to come with a 4.30 with the new 10 speed was the Tremor due to it's 35" tires.

* This post was edited 08/07/19 06:42am by ShinerBock *

AlwaysOnTheRoad

Everywhere

New Member

Joined: 07/02/2019

View Profile



Posted: 08/07/19 07:47am Link  |  Quote  |  Print  |  Notify Moderator

ShinerBock wrote:

if this 2020 truck is like all Fords I have owned, it will hit its governor at 95 mph.

I'm not sure what the max speed is limited to but I think it's either 105 or 110mph. My 2016 F150 will easily hit 103mph. Completely stock with no tuner 2.7 EcoBoost 4X4 with 3:55's.


2016 F150 4X4 2.7EcoBoost 6Speed 3:55's / 2019 Jayco Octane 222SL ToyHauler


Groover

Pulaski, TN

Senior Member

Joined: 10/17/2007

View Profile


Offline
Posted: 08/07/19 08:33am Link  |  Quote  |  Print  |  Notify Moderator

RoyJ wrote:

dodge guy wrote:

Yes, better gearing will tow better. Glad you now understand!


And with enough gearing (10 spds), two engines of the same hp, one with double the torque, will perform IDENTICAL except right off the line.

I hope you understand that now.


I agree with you in principle but in every dyno test I have seen the diesels produce much more of their rated horsepower than the gas engines in the same vehicle. So, a diesel will frequently outrun a gas engine of the same rating. I haven't found any explanation for this and it is just a personal observation. It may have something to do with diesels being considered commercial engines being tested to a different standard.

RoyJ

Vancouver, BC

Senior Member

Joined: 10/19/2006

View Profile


Offline
Posted: 08/07/19 11:31am Link  |  Quote  |  Print  |  Notify Moderator

Groover wrote:

RoyJ wrote:

dodge guy wrote:

Yes, better gearing will tow better. Glad you now understand!


And with enough gearing (10 spds), two engines of the same hp, one with double the torque, will perform IDENTICAL except right off the line.

I hope you understand that now.


I agree with you in principle but in every dyno test I have seen the diesels produce much more of their rated horsepower than the gas engines in the same vehicle. So, a diesel will frequently outrun a gas engine of the same rating. I haven't found any explanation for this and it is just a personal observation. It may have something to do with diesels being considered commercial engines being tested to a different standard.


Oh I agree, in reality any forced induction engine will likely be under-rated. A 430 hp diesel will dyno a lot healthier than a 430 hp gas. I was strictly explaining the theory behind it.

We should compare a diesel and gas that dynos the same peak hp. The diesel with an older 6 speed, and the gas with 10 spd. I bet at sea level they'd pull very close.

carringb

Corvallis, OR

Senior Member

Joined: 07/28/2003

View Profile


Offline
Posted: 08/07/19 11:43am Link  |  Quote  |  Print  |  Notify Moderator

All modern diesels use a form of torque management that maintains constant crankshaft torque regardless of FEAD (front end accessory drive) loads. Gas engines generally don't do this, except for the "downrated" 320 HP V10, which performs quite a bit better than the previous version rated at 365 hp.


Bryan

2000 Ford E450 V10 VAN! 450,000+ miles
2014 ORV really big trailer
2015 Ford Focus ST


Reply to Topic  |  Subscribe  |  Print Page  |  Post New Topic  | 
Page of 13  
Prev  |  Next

Open Roads Forum  >  Tow Vehicles

 > Ford 7.3L gas power numbers
Search:   Advanced Search

Search only in Tow Vehicles


New posts No new posts
Closed, new posts Closed, no new posts
Moved, new posts Moved, no new posts

Adjust text size:

© 2019 CWI, Inc. © 2019 Good Sam Enterprises, LLC. All Rights Reserved. | Terms of Use | PRIVACY POLICY | YOUR PRIVACY RIGHTS