So put it on you own personal test stand and figure it out. Thats all im saying. We can tell you how its fueling and why because we arnt looking at it on a stand. It has an afc problem causing it to not have full rack travel or it has a mechanical issue that isnt it allowing it fuel or a govoner is hung or what have you that no amount of guessing will cure.
Again if the only thing that has changed is the pump.
Call Kevin Vince and get this chit over with.
Does it still have the 175's slow fill pump cam, if the cam isn't letting the fuel in it doesn't matter what size p&b's you have.
I've read of guy's pushing 60-80 psi fuel pressure against a 160/175 pump just to keep good flowing 12mm p&b's filled.
Does it still have the 175's slow fill pump cam, if the cam isn't letting the fuel in it doesn't matter what size p&b's you have.
I've read of guy's pushing 60-80 psi fuel pressure against a 160/175 pump just to keep good flowing 12mm p&b's filled.
A 160 cam only allows fuel into the p&b's for a short period of time, I'm not a pump expert but I'm thinking it's around half the amount of time a 180/215 cam allows fuel in.
Look at it like this.
Take a 8 oz cup (12mm p&b) turn on you kitchen faucet for 5 seconds (160 cam), how much water do you have in the cup?
With the same 8 oz cup (12mm p&b) turn on the faucet for 10 seconds (180 cam), it probably over flowed the cup (12mm p&b where filled).
Now replace the 8 oz cup (12mm p&b) with a 12 oz glass (13mm p&b), turn on the faucet for 5 seconds (160 cam), you'll get the same amount of water in the glass (13mm p&b) as was in the 8 oz cup (12 mm p&b).
The problem is that 5 seconds (160 cam fill time ) wasn't enough time to fill the 12 oz glass (13mm p&b), since the glass isn't full what else is in it, AIR.
Everyone knows a diesel engine with air in the fuel system runs like poo.
A simple test will tell, crank up the fuel pressure another 25 psi, if the engine runs better the pump cam is the problem.
You can get more water from a faucet in the same amount of time at 75 psi than you can at 40 psi, this is why I've read several post of guys having to run 75-100 psi fuel pressure to make power with a 160 pump cam because it doesn't allow enough time to fill the p&b at lower fuel pressures.
As others have said, I've never heard of a 13mm pump with a 160 pump cam, I'd say lack of sufficient fill time is the reason.
Well looks like your the pump expert.
I've read several post and even had a conversation with Seth Farrel about the differences in the fill times between pump cams, so at this point all I can say is good luck, hope you figure it out.
YesThrottle stop screwed all the way in?
You aren't making a case that you know what you are talking about when you use terms like "slow fill cam" and "good flowing 12mm p+b". Namedropping someone else that may be an expert doesn't increase the validity of your points either. I'm looking for technical data, not secondhand speculation based on internet rumor.
I have a pump from Kevin on my 95. Granted it's only a 175 vs Seth's 215. I'll pick that 215 all day.
Remember, the pump turns half speed of engine rpm. 2000 pump rpm = 4000 engine rpm. So calibrating it at 6000rpm on the stand would be 12000rpm engine speed. Lol
Honestly whoever set it up MOST LIKELY didn’t set the governor up properly, AND, your going to fight the cam for awhile, 13mm pumps are super fun when setup correctly, if not, well you already know it’s a pain. Dealing with a slow fill cam is going to make upgrading to 13mm p&b’s less of a benefit.
I had a somewhat similar issue with a 215 pump (which was totally rebuilt into the 13mm pump I have now) where after swapping the original 160 out ran softer 2500-3500rpm. Couldn’t really pin it down where I was loosing power. Made a max effort of 740hp on nitrous and 620 on fuel. After being rebuilt turns out the shop I was using had left a screw out on the governor arm and had totally set the governor wrong for what I was trying to do. After the 13mm rebuild, and almost zero tuning time it produced 748hp fuel only and 878hp on nitrous. Granted it’s not a perfect back to back comparison since the Motor was rebuilt, but the pump seriously makes or breaks everything about how your truck performs. I temporarily swapped another 215 in place of my 13mm and it was obvious that they were not even in the same realm. (Home built 12mm pump vs a shop calibrated 13mm)
Hope you get it figured out.
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