Why do 99.5+ superduty 7.3's have different hp ratings?

[Bobby@cp]

your chip must of been really weak or your 97 had something wrong with it IMO..

the 7.3 SD's are DOGGGGS. Cant get out of their own way :lame:

My 97 was over 200k miles so stuff was prolly weak, but my SD flat hauls

 

[SEABEE08FX4]

One difference is the early 99's have basically a carry over motor from the OBS trucks.

 

[George4]

Most obs trucks are between 6000-8000 lbs and typically have 4.10 gears. Most superduty's are between 8000-10000lbs and have 3.73's.

Again, keep things in perspective; go drive a stock 160hp cummins....if you think a 4.10 geared powerstroke is weak, drive a 160hp 12v inline motor w/ 3.53 gears and a defuel set to 2100 rpms.

Thats funny I had a 93 with a 12v, all I can say is 20 mpg and I wish it had four wheel disk brakes. My 2000 is a CC DRW 4x4 long bed and I am right at 8k lbs.

 

[Petro]

Ya and I'd like to count how many codes came up after you did that. And it probably wouldn't do very much for overall performance.

Too many things changed between those years to just swap a PCM out and make more power. Truck definitely would run funky.

Ya I meant the extra power was in the tuning. I'd like to see what a newer pcm would do in an older truck.

 

[CSIPSD]

There is no structural changes from the 99.5 to the 2003 motors... They are the same.

Any HP differences are for emissions, or trans concerns or hp wars.

There are major schematic changes from 99-2001 and 2002-2003 trucks. The PCM's are not interchangeable.

 

[Petro]

There is no structural changes from the 99.5 to the 2003 motors... They are the same.

Any HP differences are for emissions, or trans concerns or hp wars.

There are major schematic changes from 99-2001 and 2002-2003 trucks. The PCM's are not interchangeable.

Thanks

 

[dietoremain]

There is no structural changes from the 99.5 to the 2003 motors... They are the same.

Any HP differences are for emissions, or trans concerns or hp wars.

There are major schematic changes from 99-2001 and 2002-2003 trucks. The PCM's are not interchangeable.

Couldn't have said it better joe!

Sent from my T-Mobile myTouch Q using Tapatalk 2

 

[85_305]

Thats funny I had a 93 with a 12v, all I can say is 20 mpg and I wish it had four wheel disk brakes. My 2000 is a CC DRW 4x4 long bed and I am right at 8k lbs.

My 12v got 13-16mpg, and it was 5spd. My obs gets 18-22mpg... Auto with a lift. Plus the braking in the 12v 2nd gens was absolutely atrocious.

 

[96stacked&smoken]

Iv never heard of anyone getting that low of mpgs with a 12v.

 

[old man dave]

There is no structural changes from the 99.5 to the 2003 motors... They are the same.

Any HP differences are for emissions, or trans concerns or hp wars.

There are major schematic changes from 99-2001 and 2002-2003 trucks. The PCM's are not interchangeable.

Except for PMRs for forged.

 

[Morgan@Midwest Diesel & Auto]

Except for PMRs for forged.

And AB injectors to AD. 15 degree to the 17 hpop. The turbo, plenum, intake/uppipes and the glow plug only, glow plug/intake heater, to controller style. But I'm going E99-2003.

 

[CSIPSD]

There is no structural changes from the 99.5 to the 2003 motors... They are the same.

Any HP differences are for emissions, or trans concerns or hp wars.

There are major schematic changes from 99-2001 and 2002-2003 trucks. The PCM's are not interchangeable.

Please read again... There were no Structural changes from the 99.5 to 2003 motors, they are the same...

Except for PMRs for forged.

I understand that, however that is not a structural change per say. In fact that is part of the issue with the PMR's, they did not structurally change them when they changed material.

And AB injectors to AD. 15 degree to the 17 hpop. The turbo, plenum, intake/uppipes and the glow plug only, glow plug/intake heater, to controller style. But I'm going E99-2003.

Your taking this back further then the discussion... but what ever floats your boat!

 

[85_305]

Iv never heard of anyone getting that low of mpgs with a 12v.

People often times dont like you to know the truth. My 12v was a 2wd dually, 5spd, turned up pump, stock lift and skinny OTR tires and still got 13-16mpg... no matter how easy I drove it. Some cummins guys will cling to absolutely nothing only to prove their 5.9 has something worthwhile

 

[Morgan@Midwest Diesel & Auto]

Except for PMRs for forged.

And AB injectors to AD. 15 degree to the 17 hpop. The turbo, plenum, intake/uppipes and the glow plug only, glow plug/intake heater, to controller style. But I'm going E99-2003.

 

[jbwaldrop88]

The RWHP differences between the manual and auto tranny's probably has something to do with not losing as much power to the wheels in a 6 speed vs an auto. From 99.5 to 03 the only thing I can think of that they changed that would really affect power was changing injectors and tuning.

 

[CSIPSD]

The RWHP differences between the manual and auto tranny's probably has something to do with not losing as much power to the wheels in a 6 speed vs an auto. From 99.5 to 03 the only thing I can think of that they changed that would really affect power was changing injectors and tuning.

There were no injector changes from 99.5 to 2003... The only thing they changed was the tuning, the manuals had more CRANK HP because the manual was rated for more... No OEM HP rating is at the RW, its always Crank.

 

[jbwaldrop88]

There were no injector changes from 99.5 to 2003... The only thing they changed was the tuning, the manuals had more CRANK HP because the manual was rated for more... No OEM HP rating is at the RW, its always Crank.

I was adding in the early 99's too, my fault, and the OP asked about RWHP, not crank hp, and while I did forget that manuals come rated higher, even with identical tuning a manual will put more to the ground, that is until you blow the clutch or exceed the rating of the tranny.

 

[CSIPSD]

I was adding in the early 99's too, my fault, and the OP asked about RWHP, not crank hp, and while I did forget that manuals come rated higher, even with identical tuning a manual will put more to the ground, that is until you blow the clutch or exceed the rating of the tranny.

The title of the thread is...



"Why DO 99.5+ Superduty 7.3's have different hp ratings"

The HP rating is at the crank...

 

[jbwaldrop88]

The title of the thread is...



"Why DO 99.5+ Superduty 7.3's have different hp ratings"

The HP rating is at the crank...

And the OP also said "Stock HP Ratings... 99-00 trucks are 190rwhp 2001-2002 trucks are 220 rwhp rated .....Torque stock is 525lbs" And it just got me wondering. Thanks" . Now I dont know who supposedly dynoed these trucks, but I was trying to keep with the question posed, sorry you weren't.

 

[cjfarm11]

The early 99 Had 120cc injectors stock with a 15Degree HPOP and the Later models had 140cc injectors with a 17 degree HPOP