Timing versus HP comparison.

pop the 188-220 in and see where you go from there.

Not going to happen Zach. The 188-220 is going in the 6.7 with the zzfab head. I'm even more interested in how that's going to turn out after trying the new pump.
 
Congrats. Nice to see you finally broke into the 4 digits.
 
Not going to happen Zach. The 188-220 is going in the 6.7 with the zzfab head. I'm even more interested in how that's going to turn out after trying the new pump.

I think you are getting close to your goals you had with the 6.7, zz head and 188-220. Knowing that the pump and injectors was holding you back, you might have to come up with a new goal for the new found air. More air, more fuel, more air, more fuel, more air, more fuel. At what point are you going to stop?
 
I think you are getting close to your goals you had with the 6.7, zz head and 188-220. Knowing that the pump and injectors was holding you back, you might have to come up with a new goal for the new found air. More air, more fuel, more air, more fuel, more air, more fuel. At what point are you going to stop?

I decided not to try building a set of tripples and sold my set of (the next size up) injector nozzles, so I guess I'm getting towards the end. It ran 11.1@126 defueling before each shift with a mediocre 1.7 60ft. It's up 200hp now and almost 1000 more rpm along with much stronger mid range and spools faster. I'm thinking if it will hold together, the last goals will be reached with one more 1/4 mile pass. I think that will make either 9 or 10 total 1/4 mile passes on this truck. That's 11 more than it was designed for.LOL
 
Will traction be an issue with this new 200hp? Or do you already have that covered?
 
I decided not to try building a set of tripples and sold my set of (the next size up) injector nozzles, so I guess I'm getting towards the end. It ran 11.1@126 defueling before each shift with a mediocre 1.7 60ft. It's up 200hp now and almost 1000 more rpm along with much stronger mid range and spools faster. I'm thinking if it will hold together, the last goals will be reached with one more 1/4 mile pass. I think that will make either 9 or 10 total 1/4 mile passes on this truck. That's 11 more than it was designed for.LOL

Congrats on breaking 1000Hp:rockwoot:
 
I just got home with it. It's different. Really needs tuning, really, really. Ok out on the hghway, but my wife decided to stop and have lunch in Chico. Governor springs are a click or 2 too tight and in gear at idle is a total disaster. I was trying to back out of a parking spot and was trying to just put it in reverse for about a 1/2 second and get it to start moving and then drop it into neutral. I accidentally went from reverse to drive and back about 3 times in just a couple of seconds. I bounced so much I think i heard the oil pan hit the ground. For a second i thought my prostate and my thyroid switched places. as soon as it cools off I'll back them off. The afc is way off too. It worked great on the other 13mm pump but this ones getting way too much fuel on the bottom. Big difference between the 4k springs and the 5k's in the other pump. This one is not as goosey, but takes more throttle to get going.
 
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i have heard there is a huge throttle difference between 4k and 5k's would you agree? also what one do you like more and why?
 
i have heard there is a huge throttle difference between 4k and 5k's would you agree? also what one do you like more and why?

I don't have a 13mm pump, just a plain Jane 160 pump but I recently went from 4K's to 5K's and I'd have to say the super tight 4K's (1200 rpm idle from being so tight) fueled the same as the 5K's on the street in lower RPM's. Right at 3550 RPM, the 4K's started to cut back with noticeable defueling at 3700 RPM. The 5K's didn't cut back at when I took it up to 4400 RPM. I didn't go higher because I'll never need more than 4100 RPM of full fueling with my Junker Drag Truck.


I too would be really interested in hearing Ron's 13mm pump results with 4K and 5K governor springs.
 
i have heard there is a huge throttle difference between 4k and 5k's would you agree? also what one do you like more and why?

I like how little throttle input it takes to drive with the 5k springs. The pedal is a bit touchy and it does take a few days to get used to it. The 4k springs require more pedal to drive, but don't transmit bumps into throttle movement as bad. A bit smoother when you let off and then go back to slight throttle too.
 
Thank you, that's about what i was looking for.
Also curious, what did these pumps start life as? Curious if they have the same cam in them.
Thanks for all the good info hope the tuning comes easy
 
Thank you, that's about what i was looking for.
Also curious, what did these pumps start life as? Curious if they have the same cam in them.
Thanks for all the good info hope the tuning comes easy

My CDS pump started out as a stock 180 core pump. My new one started out as an almost new(17k miles) 887(215) pump. CDS pump has stock cam, new pump has a modified(but not radical) cam.
 
My CDS pump started out as a stock 180 core pump. My new one started out as an almost new(17k miles) 887(215) pump. CDS pump has stock cam, new pump has a modified(but not radical) cam.

How do your timing charts compare between pumps?
 
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