SO & HO VP44's?

[Jobless]

When I picked my used CTD in Texas it was throwing VP44 codes so they put an HO pump from a newer used truck that had no codes on it.

Shortly after I got the truck home I put a FASS pump on it. The swapped in HO VP44 lasted about a year...we ended up putting a SO pump back on the truck, it's the 215hp motor and I instantly noticed about a 50hp drop. It was a definate seat of the pants drop that you could feel. The truck was an absolute slug so I added the SMARTY and got back a little of the spunk back in it.

I understand about the plungers being bigger in the SO pump and that folks with higher HP motors & setups like them cause they flow more fuel.

Two questions:

1. Are all SO trucks rated 215hp or was there a 235hp version as well before they went to the 245hp HO?

2. Does a stock HO VP44 on an SO motor/ecm make more power or was there probably something wrong with the HO pump they swapped in that made it feel like it made more power?

 

[BgBlDodge]

My SO was 235hp rated. I'm 99% sure that all SO vp's were rated at 235hp. I don't THINK any were rated at 215hp. The 98 12v's had a 215hp p-pump on them.

The SO will lose some bottom end but will make up for it on the top end. I ran an HO pump on my SO for a month (my truck is an auto) and the truck had a LOT of timing rattle and was much peppier on the bottom end. Top end was definitely lacking though over the SO pump I was running.

 

[blu_by_u]

From 98.5 to 00 the automatics were rated for 215hp. The 5 speed trucks were rated for 235hp.

To my knowledge, there is no difference in pumps between the 215 and 235 trucks. Only injectors and ECM calibration.

 

[BgBlDodge]

I'm willing to bet it was more ecm related than injector.

 

[WhiteKnight]

From 98.5 to 00 the automatics were rated for 215hp. The 5 speed trucks were rated for 235hp.

i have a 98.5 auto and factory it had 235. there are no 215 24vs. early 98 12vs were rated at 215 horse. theres either 235 SO 24vs or 245 HO 24vs

 

[Smokem]

i have a 98.5 auto and factory it had 235. there are no 215 24vs.

No it didn't, and yes there were.

ISB With Automatic Transmission
Peak Torque: 420 lb-ft (from 1600 to 2700 rpm)
Advertised Power: 215 hp @ 2700 rpm
Governed Speed: 3200 rpm
No Load High Idle: 3500 RPM

 

[Smokem]

From 98.5 to 00 the automatics were rated for 215hp. The 5 speed trucks were rated for 235hp.

Craig, what was the name of that little company you used to work for, seems like I have heard of them before, Cummins was it?

 

[LReiff]

The '02 5-speed trucks are also rated @ 235hp.

 

[blu_by_u]

Craig, what was the name of that little company you used to work for, seems like I have heard of them before, Cummins was it?

:hehe: I have no clue about what I talk about on here. Please feel free to argue with me. LOL

 

[blu_by_u]

The '02 5-speed trucks are also rated @ 235hp.

Right, all vp44 5 speeds were 235hp, automatics from about 00.5 (if I remember correctly) were also 235hp and that's also when they started with the torque managment. And of course the 6 speed 245hp came out in 00.5, in very low volumes, then more in 01 and 02.