Ring n pinion - Dodge Cummins Diesel Forum
94-98 Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect...NO ADVERTISING

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post #1 of 14 (permalink) Old 01-21-2020, 08:05 PM Thread Starter
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Ring n pinion

Ok, I haven't been on in a while, but that hasn't stoped me from accumulating parts for my build. I decided to follow most of you guys advice, and i ditched the 700r4, although monster said it would have survived behind a stock cummins. However I don't know if it will stay stock, so I'm going with a gm allison 1000 6 speed. I have the 4x4 transmission with a mp1226XHD transfer case, from behind a duramax. I'd love an np 205, but the 1226 should be beefy enough for me. I also have some f-250 axels with 3:73 gears in them.

I have been looking a the calculator on CM Conversions site trying to figure out what gears ill need to run 35-37" tires. I have been thinking that I want to keep my cruse rpms close to 1800 for fuel economy (sweet spot). So according to the calculator if I run:

37" tires

4.56 gears
72 mph
.71 5th gear
2117 rpm
--------------
4.56
72
.61 6th gear
1819 rpm
____________________

35" tires

4.56
72 mph
.71 5th gear
2238 rpms

----------------------

4.56
72 mph
.61 6th gear
1923 rpms

Im thinking 5th for towing, and unloaded 6th gear daily driving. The question: Is this realistic? Does the cummins make enough power and torque to maintain speed @ 1800 rpms in 6th gear, and same question if I'm towing in 5th?
I think the answer is yes for unloaded. I have had a couple dodges, and they like 1800 rpms for fuel economy. The real test would be towing a trailer 7-8k in 5th would I be high enough in the rpm range to maintain speed up a grade? Where does a stock dodge cummins make its best power?


96 12v on an engine run stand I built. Got it running thanks to parts I bought from Dart340w2, and some info I gathered from reading this site.
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post #2 of 14 (permalink) Old 01-21-2020, 09:23 PM
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I know I'm going to regret getting into this discussion, but I have questions. What is this combo of engine/transmission/axles going into? What is it you plan to tow at 72 mph? A bass boat, a deckover flatbed, a horse trailer, a bullet shaped TT like an Airstream or a conventional TT or utility trailer? Weight isn't nearly as much a factor as aerodynamics. I'm also curious why people feel the need to maintain a high speed while towing up hills. I know why people feel the need to pass everything on the road with a trailer attached. As far as best power goes, that would be a combination of cam, fueling and turbo(s).

97 3500, 2 WD, G56, slightly bombed, 1.3 million miles with un-additized diesel fuel. Started the second million on 8/24/13
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post #3 of 14 (permalink) Old 01-21-2020, 10:05 PM Thread Starter
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Thanks for the reply.
At the moment its going into a K5 Blazer. However once I get a combo put together that I like, it may find its self into something with a longer wheel base like a tahoe or suburban, or a van. As for what I would be towing, a 20' boat, single car trailer, 20' camper.
As far as needing to go 70 mph, i just want to keep up with traffic, not be that guy everyone is trying to get around. I know even 70 mph isnt fast enough for some people.

I want my cake and eat it too. I want to cruse at 65-70 mph at 1800 rpms unloaded daily, and Be able to tow a light/medium load @ 70 mph in 5th every once in a while.

At the moment the engine is bone stock 96 12 valve. Im leaning toward that combo with 35" tires, i don't drive 70 mph that much anyway.

96 12v on an engine run stand I built. Got it running thanks to parts I bought from Dart340w2, and some info I gathered from reading this site.
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post #4 of 14 (permalink) Old 01-22-2020, 09:39 AM
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At some point in your life you will realize there isn't any glory in "keeping up with traffic". The speed limit in west TX is 85 on I10. I still tow at 57-60.

You will need to do some fueling mods for what you are planning. Enclosed car trailers and 20' campers have a lot of aerodynamic drag and the Blazer isn't much better. I don't suppose you know if you have the 180 or the 215 HP version? CPL's for Dodge Ram diesels
Getting up to around 300 hp 600 tq (at the wheels) is relatively inexpensive, all it takes is a fuel plate with a different profile and some tuning. Stock injectors and turbo will get you there. You need tq for getting those big tires rolling and for towing. 420 or 440 at the flywheel will make the experience frustrating. to answer your question 1800-2000 rpm with stock components is where peak tq comes in and it stays fairly level up to around 2600 on my originally 215 hp engine.

97 3500, 2 WD, G56, slightly bombed, 1.3 million miles with un-additized diesel fuel. Started the second million on 8/24/13
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post #5 of 14 (permalink) Old 01-22-2020, 07:45 PM Thread Starter
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Well that was disappointing, went out to shop, and the cpl tag is missing from timming case. I do have another fuel pump thats a 180.

96 12v on an engine run stand I built. Got it running thanks to parts I bought from Dart340w2, and some info I gathered from reading this site.
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post #6 of 14 (permalink) Old 01-22-2020, 09:39 PM
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There is a data plate under the throttle linkage bracket that shows the model number of the IP. That model number's last three digits show which pump you have.

97 3500, 2 WD, G56, slightly bombed, 1.3 million miles with un-additized diesel fuel. Started the second million on 8/24/13
If you are lucky enough to be in Texas, you are lucky enough.
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post #7 of 14 (permalink) Old 01-24-2020, 03:49 PM Thread Starter
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908 BOSCH
PES6P120A120RS737S
D 402 736 885
57200 01005

Thats from the plate behind throttle linkage

96 12v on an engine run stand I built. Got it running thanks to parts I bought from Dart340w2, and some info I gathered from reading this site.
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post #8 of 14 (permalink) Old 01-24-2020, 04:04 PM Thread Starter
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215hp is 887 and 913/908
180hp is 885 and 911 (I think a 912 is an CA 180 pump)
160/175hp is 838/841/854.

PES6P110A120RS7213

PES6P -Denotes number of cylinders and Basic Pump Model

110 -Denotes B&P Size

A120RS -Denotes Cam rotation direction (Cummins is Right)

7213 -Denotes Pump series (2000, 3000, 7000, etc)


If I'm reading this rite I have the 215 pump

96 12v on an engine run stand I built. Got it running thanks to parts I bought from Dart340w2, and some info I gathered from reading this site.
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post #9 of 14 (permalink) Old 01-24-2020, 04:13 PM
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Quote:
Originally Posted by seaurchin1969 View Post
215hp is 887 and 913/908
180hp is 885 and 911 (I think a 912 is an CA 180 pump)
160/175hp is 838/841/854.

PES6P110A120RS7213

PES6P -Denotes number of cylinders and Basic Pump Model

110 -Denotes B&P Size

A120RS -Denotes Cam rotation direction (Cummins is Right)

7213 -Denotes Pump series (2000, 3000, 7000, etc)


If I'm reading this rite I have the 215 pump
yeah 215hp engine (or timing cover at least). the 215 and 180 pumps are almost identical, the 215 came with 5x.0095 injectors vs 5x.0090 in the 180.

looked into a 4.30 or 4.10 gear? stock gearing in a 47/48re truck is [email protected] with 3.54 gears and ~31" tires. OD gear is .69:1

why not use a 47/48re?
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post #10 of 14 (permalink) Old 01-24-2020, 04:14 PM
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Quote:
Originally Posted by seaurchin1969 View Post

If I'm reading this rite I have the 215 pump
You read the wrong number the 908 you see is the plant it was manufactured at you have a 180 pump still a good pump.
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post #11 of 14 (permalink) Old 01-24-2020, 04:16 PM
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Quote:
Originally Posted by seaurchin1969 View Post
D 402 736 885


Thats from the plate behind throttle linkage
885 at the end of this number is your pump designation should be a 180
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post #12 of 14 (permalink) Old 01-24-2020, 05:17 PM Thread Starter
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Quote:
Originally Posted by myother4x4isaCJ7 View Post
885 at the end of this number is your pump designation should be a 180
Ok that clarifies it, thanks. I have read about people making lots of power with the 180 pump. Im not looking to make extreme power, just a daily driver/ light /medium tow rig

96 12v on an engine run stand I built. Got it running thanks to parts I bought from Dart340w2, and some info I gathered from reading this site.
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