• Steel Soldiers now has a few new forums, read more about it at: New Munitions Forums!

  • Microsoft MSN, Live, Hotmail, Outlook email users may not be receiving emails. We are working to resolve this issue. Please add support@steelsoldiers.com to your trusted contacts.

Options for higher top speed?

Atradies

New member
1
0
1
Location
Maryville,Tn
Sorry, been away for a bit. M931a2, not so much for more speed, but for a slightly lower rpm while cruising on flat ground. How would a transfer case increase top speed, I thought they where 1:1 in hi gear. Ive got 14.00x20 tires.
Lower the gear on the transfer case the faster the input shat moves which will be you output n 205 cough
 

74M35A2

Well-known member
4,145
332
83
Location
Livonia, MI
Easiest way is to install 16.00 tires and turn up the injection pump. Add an EGT gauge to not melt the engine down.
 
  • Like
Reactions: 98G

98G

Former SSG
Steel Soldiers Supporter
6,088
4,493
113
Location
AZ/KS/MO/OK/NM/NE, varies by the day...
Easiest way is to install 16.00 tires and turn up the injection pump. Add an EGT gauge to not melt the engine down.
This ^

With 16.00s on my M925 I don't even see 5th gear until cruising on the interstate.

Thing is, you pretty much need to treat the transmission as a manual. Otherwise the downshift will be late and the upshifts will be early.

A pic, just for general principles -
 

Attachments

ProeliatorRex

New member
2
2
3
Location
Oregon
Not sure what the previous owner did to my '91 M939 (guarantee they turned the fuel screw up) but it definitely scoots just fine, and cruises easily at 65mph. Its bobbed, and lightened up those brakes will throw you through the windshield if you don't respect them. My buddy is a big diesel mechanic, and he said the Allison in these has another top gear you can unlock.....but I have zero idea if that's true or just rumor as I have not researched it. All I know is that 65 is easy, it might have more but didn't want to spin it to 3k rpm. Not sure I'd really want to send this sucker down the road any faster anyways, especially with how people pull out in front of you these days. Wedged under my front differential isn't a great look for a Prius.
 

162tcat

Active member
710
46
28
Location
Washington
Not sure what the previous owner did to my '91 M939 (guarantee they turned the fuel screw up) but it definitely scoots just fine, and cruises easily at 65mph. Its bobbed, and lightened up those brakes will throw you through the windshield if you don't respect them. My buddy is a big diesel mechanic, and he said the Allison in these has another top gear you can unlock.....but I have zero idea if that's true or just rumor as I have not researched it. All I know is that 65 is easy, it might have more but didn't want to spin it to 3k rpm. Not sure I'd really want to send this sucker down the road any faster anyways, especially with how people pull out in front of you these days. Wedged under my front differential isn't a great look for a Prius.
No additional top gear to unlock. 6cta doesn’t mind spinning a little faster but if you are running NHC 250 keep it under 2,200.


Sent from my iPhone using Tapatalk
 

G744

Well-known member
Steel Soldiers Supporter
1,725
3,884
113
Location
Hidden Valley, Az
If no one stated this, the Mack ENDT-673 is governed at 2100 RPM, whereas the Multifuel is somewhere around 2800. That explains your 30-something speed.

The Cummins 250's were usually set @ 2100 as well. Both those engines used the OD 5-speed.

The multifuel and big 6602 gassers used the straight 5-speed.

DG
 

5tonpuller

Active member
573
27
28
Location
Thompson, Pa
The truck does 53-55 and drives just fine. Bigger tires will make hills a lot slower. Over drive 5 speed will kill the small over the hill in the road. Will turn it into a shift me truck. I was told some time ago that "you need to learn to just enjoy the ride" . At 17 ton 53 year old truck is not going to be a speedy thing. A little better at hill climbing would be nice.
 

simp5782

Feo, Fuerte y Formal
Supporting Vendor
12,130
9,405
113
Location
Mason, TN
No additional top gear to unlock. 6cta doesn’t mind spinning a little faster but if you are running NHC 250 keep it under 2,200.


Sent from my iPhone using Tapatalk
They can turn 2700 before the valve springs give out. 2400 rpms unloaded isn't a big deal
 
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website like our supporting vendors. Their ads help keep Steel Soldiers going. Please consider disabling your ad blockers for the site. Thanks!

I've Disabled AdBlock
No Thanks