Hey guys I've asked this question a few times before, not much luck with an answer... but I just realized I had bad info.

Ok so my truck is in my signature-- I have a newish IP(bumped up one flat) and newish injectors, though I know some leakdown a bit. I've pop-tested them and they aren't amazing but about 100psi apart from highest to lowest.

At 3/4 throttle - WOT I have a big acceleration boost once my truck hits 2k rpms. Maybe 1900/1950, but you get the idea. After that point the acceleration is smooth and strong.
But I really don't have much acceleration until that 1950 mark. It's ok, but much better at that mark and higher. I don't think that's supposed to be normal. Is it?!?

Timing - currently at 8.5*BTDC using a ferret adapter. However, power curve stuff doesn't change when the base timing is changed. Back at 6* it did the same thing, and also the same thing at 9*.

My N/A IP has a torque screw. I haven't played with it a ton, but giving it more fuel helped bring up the accel under 2K. I'm worried now about giving it too much fuel as I'm getting some black smoke in certain conditions.
Perhaps the answer lies with the torque screw-- knock down the max fuel one flat inside the pump, then add fuel via the torque screw for the lower RPM delivery?

Thanks guys, this has been bugging me ever since I got the pump like 3-4 years ago.

-Joshua

P.S.- the "bad info" I referred to was that I kept thinking I had a Turbo IP, because of the torque screw. So that may have limited the knowledgeable replies of many because that would be an odd combo, most people would not have experience with it.

 

it's probably the pump restricting fuel until the turbo would hit (around 2k)

i am pretty sure that is what the torque screw does

 

That sounds like mine. Complete turd till about 1700 then good. The problem is the heads on these flow horrible at low rpms but very very well at high rpms. So naturally that makes these thing kind of dogs down low. Hope that helps

 

turtlemann14: I have an N/A IP. It does have the torque screw, and it's a common misconception that all torque screw IP's are for turbo. It's a DB2-5013 for reference.

Hmmm, interesting, Fordidipower.

Anyone else with similar OR different feelings about the N/A engines?
-Joshua

 

Mines never had a noticable power increase when it was NA, i always thought it had really good off idle power. Was kind of dissapointed with what it had for top end though. My guess is timing related.

 

Not sure mine seems to be the exact opposite I can beat most 4 and 6 cylinders off the line for about 15 feet then I just don't have the high end torque or rpms to continue winning and races

 

Check here.

https://www.ford-trucks.com/forums/1...ning-info.html

 

Well my bet is that your engine is also a stock engine. The camshaft timing limits this engine. The engine can't breath as well in a stock form. The turbo helps but if you don't fix the camshaft timing and hang times it will never keep up with your demand for power on the Mid range... Or even the high rpm like you were saying you run out of power after so many feet because of lack of camshaft timing

 

Aune, who are you talking to? I have good power up top, just not down low. Like these engines are rated at max torque around 1600 rpms, but you wouldn't ever know it on my engine. If I dynoed it I doubt seriously if its peak torque is that low.
Hmm, ive had the timing all over the place and it never changed that 2k surge. Maybe the timing retard mechanism on the IP is outta whack.

It's crazy that we all have such different powerbands...

Anyone else? Where's the IP builders around here to comment? The Justins, Russ, Brandon, etc?
Thanks guys,
Joshua

 

I actually clocked my truck NA, it was faster shifting at 2500 rather than 3000 picked up almost .3 in the 1/4 mile.