Your stock/OEM 2800 rpm spring allows full fueling up to around 2800 engine rpm, and then starts defueling as engine speed continues to increase. The engine can and will run up to higher rpm, but the fuel-fuel power is rolling off. You can put your mess in neutral, floor it, and the engine will wind up well past 3000 engine rpm.

The 3200 rpm spring will allow fuel fueling up to about 3200 engine rpm, and then start defueling.

The point is that with normal driving, you may want to wind the engine up in a lower gear, say . . . to get around a slow-poke. You can do it, without the power nosing-over before you shift gears. The biggest feature of the 3200 rpm spring, is the improvement to overall engine response with normal driving. It's NOT necessarily about having more power.


For what it's worth, we also have available to us, a 3800 and 4200 engine rpm spring. While they offer the same benefit (just to a higher rpm), we eventually run into issues of mechanical limitations of the VE injection pump. Its fuel moving capacity inherently starts rolling off around 3500 engine rpm unless you start modifying it (higher fuel supply pressure, etc).

 

My eyes are now open wow

 

yea this thread helped clear some fuzzy ideas alot! ty

 

Mine doesn't roll off, it keeps pulling right to 3200RPM then defuels. I'd think it has more to do with supplying a sufficient amount of fuel to solidly obtain 3200RPM than having a governor that will let you reach 3200RPM regardless of insufficient fuel delivery. I probably would have a roll off if I had a 3800 or 4000RPM spring.

 

The SINGLE best improvement you can do to a STOCK pump is make sure it gets full throttle travel, by removing the high RPM limiter screw and making sure you have FULL travel on the linkage, which means make sure your throttle cable is working as it should.

I've said it before, I'll say it again.

My old wedgebed is stone dead STOCK, with 4.56 gears and a dead nuts accurate speedo.
The ONLY modifications are the high RPM throttle limiter screw is totally removed and the throttle cable/linkages corrected.
I'm also running an electric fuel pump.

Before adjusting the high RPM screw (linkages already corrected), it would do 65mph TOPS in 5th.
After the high RPM screw was removed, I can do 80mph with no problem, though that's excessive in a truck weighing 8,000 pounds EMPTY and having a 29 foot total length.

So, in my circumstance, to get the rpms up, adding the 3200 spring is hardly necessary and I even have 4.56 gears.

Mark.