M923A2 really doggy starting out in first gear

[Valleyordnance]

Hi Guys,

Got a weekend off to play with my toys. I've been working on my 923A2 Hardtop and have gotten her cleaned up really well. Only remaining problem I'm encountering is that it is absolutely gutless starting out from zero in 1st gear. once up over 10-20 MpH there is power. I've checked the parking brake to make sure it's coming off. All airbrakes appear to be functioning properly. Have not checked fuel filter yet.

Does this sound like a fuel issue? Turbo? any help at all?

Appreciate any light that can be shed on this problem, I'm scratching my head!

Chris R

 

[plode]

Until the turbo spools up there really isn't much(any) power. I'd say on my truck the turbo really doesn't fully spool up until at least 10+mph.

Can't hurt to change out the fuel filters, check the air filter. Getting 49" tires spinning and pushing 20K lbs isn't something that will happen too quick

 

[wheelspinner]

Do the fuel pump mod to turn it up. Made a HUGE difference off the line in mine.

 

[Valleyordnance]

Can you elaborate on the fuel pump mod? Or link?

My dad has the same truck and mine is not right, I know they are slow off the line, but I pulled out of a stop light with over a block clear and wound up stopping traffic on the way home with it. Once it's moving it's fine though.

 

[PWM]

In the 5 Ton mods page search for "So-who-has-bumped-the-power-on-a-6CTA-cummins" it has a ton of information on the subject. I tried to post a direct link but it didn't work.

 

[PWM]

My truck was the same way , now I have to be careful in town it will get up to 35 or 40 miles per hour quick.

 

[shadowdd]

I can vouch for turning up the pump a bit.... Makes is a totally different truck!!

 

[Valleyordnance]

I can vouch for turning up the pump a bit.... Makes is a totally different truck!!

I'll give it a shot, thanks for the responses!

Chris

 

[ctoathkeeper]

I agree with shadowdd ...turning the right screw makes a huge difference...plus as a bonus you get nice black smoke from the stack...when a prius pulls up next to you....

 

[74M35A2]

Doggie style...

 

[Doug Roberts]

make sure the spring brakes aren't grabbing for some initial low air reason . My truck starts out and shifts so much better after I changed my transmission fluid

 

[Valleyordnance]

Did the pump mod, WOW! Thanks for the help guys!