Home   Forums   Gallery   Vendors   Advertising   Links
Go Back   DieselRam.com > Diesel Ram Technical Topics > NEW! Technical Info: 4th Gen DRIVETRAIN
NEW! Technical Info: 4th Gen DRIVETRAIN Technical discussion of fourth generation (2007.5 and up) 6.7L engine and drivetrain questions, solutions and upgrades. For trucks with the 5.9L engine use the appropriate 3rd gen forums.
Reply
 
Thread Tools Search this Thread
  #1  
Old 01-15-2021
racingskull6670 racingskull6670 is offline
Member
 
Join Date: Dec 2014
Location: chicago, illinois
Posts: 74
Default ppump24v power loss

Hi everyone, last year I built a ppump 6.4 for my 4th gen (manual truck) and have never gotten the thing to run right. It runs and drives fine, but doesnt have much power and gets terrible fuel mileage (around 9-10mpg).

basic engine specs...(destroked 6.7)
6.7 block with the deck shaved to match factory piston protrusion
vp 24v head
5.9 crank
12v rods
6.7 QSB flycut pistons
215 ppump
Stock or 6x.011 injectors (vp pop pressure on both)
.093 or .084 hard lines
025 delivery valves
4kgsk
stock gutted feed tubes or gutted .093 ones
hamilton pushrods and springs
arp 625 head studs

SO... the engine doesnt seem to like to spool or really rev. Current setup is stock injectors, 025 dvs, and .084 fuel lines with an hx35 and 16* of timing. In overdrive it will spool the hx 35 at 1500 rpm with some smoke but the truck just seems lazy and gets terrible fuel mileage. Afc is all the way forward and I've messed with it a TON and its either clean but wont spool at all, or smokey and will spool ok. Right now its fueled heavy down low and will clear up under boost. I have 38-40 psi of fuel pressure idle and 35-37psi at wot. I've slowly backed down the fuel mods from what I started with to try and get the truck to run clean but it just doesn't seem to want to run very clean and its driving me nuts.
I've tried an s300sxe 62/74, every fuel mod listed above starting with the bigger fuel options i originally put on the engine, and timed the pump anywhere from 16-24* and it hasn't ever gotten any better

Any help or incite into what issues might be causing this would be GREATLY appreciated!!!
__________________
2012 Ram 4500 leveled on 6 custom 20x11, 37x13.5s
G56, custom girdle, valair dd organic, Gearvendors OD
Destroked 6.7 ppumped
Reply With Quote
  #2  
Old 01-15-2021
Clunk's Avatar
Clunk Clunk is online now
Senior Member
 
Join Date: Mar 2004
Location: Tennessee
Posts: 9,401
Default

Seems like the injectors should pop with the injector pump feeding them.
How much boost are you building? The exhaust housing and turbine seem kinda big.
__________________
01.5,Red QC Sport SWB,HO,6spd,4x4,cowl hood, Drag Comp,4"ex., fuel press. gauge, boost&pyro gauges, bhaf, single Holley lift pump next to the fuel tank/13psi WOT, Vulcan Big Line, cheapo fuel cooler, Amsoil in the trans. & Valvoline in the pan, 63-65-.70A/R, ARP studs, kevlar/ceramic SD clutch, jammer 100's

Quote:
Originally Posted by jetfueljockey View Post
Doc says I'm in pretty good shape for an 83 year old guy.....one of these days I need to tell him I'm 59.


Time to turn so's you don't burn.
Reply With Quote
  #3  
Old 01-15-2021
racingskull6670 racingskull6670 is offline
Member
 
Join Date: Dec 2014
Location: chicago, illinois
Posts: 74
Default

I switched from the s300 since it was super laggy and put back on the hx35. I can get 35-40lbs of boost at 40-50lbs of drive pressure in overdrive. I have the gate blocked off for now because it wouldn't spool at all with it hooked up. Egts climb pretty fast over 30lbs of boost
__________________
2012 Ram 4500 leveled on 6 custom 20x11, 37x13.5s
G56, custom girdle, valair dd organic, Gearvendors OD
Destroked 6.7 ppumped
Reply With Quote
  #4  
Old 01-17-2021
racingskull6670 racingskull6670 is offline
Member
 
Join Date: Dec 2014
Location: chicago, illinois
Posts: 74
Default

So I did a boost leak check and found that I had a big leak at the intake horn. Fixed that and that helped a tad, but still not to what I feel a mostly stock truck should have power wise. Still wont light the hx35 until 1500 rpm in overdrive.
I fixed the wastegate to open at 30-32psi which helped keep drive pressure down to around 40psi max.

I do get what sounds to be rail rattle around 1900-2000 rpm under load. Not sure if that may be a tell tale sign of injection pump wear or not.
__________________
2012 Ram 4500 leveled on 6 custom 20x11, 37x13.5s
G56, custom girdle, valair dd organic, Gearvendors OD
Destroked 6.7 ppumped
Reply With Quote
  #5  
Old 4 Weeks Ago
Clunk's Avatar
Clunk Clunk is online now
Senior Member
 
Join Date: Mar 2004
Location: Tennessee
Posts: 9,401
Default

What exhaust temperatures are you seeing?
__________________
01.5,Red QC Sport SWB,HO,6spd,4x4,cowl hood, Drag Comp,4"ex., fuel press. gauge, boost&pyro gauges, bhaf, single Holley lift pump next to the fuel tank/13psi WOT, Vulcan Big Line, cheapo fuel cooler, Amsoil in the trans. & Valvoline in the pan, 63-65-.70A/R, ARP studs, kevlar/ceramic SD clutch, jammer 100's

Quote:
Originally Posted by jetfueljockey View Post
Doc says I'm in pretty good shape for an 83 year old guy.....one of these days I need to tell him I'm 59.


Time to turn so's you don't burn.
Reply With Quote
  #6  
Old 4 Weeks Ago
racingskull6670 racingskull6670 is offline
Member
 
Join Date: Dec 2014
Location: chicago, illinois
Posts: 74
Default

Cruising under 2k rpm in double overdrive doing around 75-80, it stays around 800-900. Wot i can peg my 1600 egt gauhe if i stay in it long enough. Doesnt take long to get it past 1200.
__________________
2012 Ram 4500 leveled on 6 custom 20x11, 37x13.5s
G56, custom girdle, valair dd organic, Gearvendors OD
Destroked 6.7 ppumped
Reply With Quote
  #7  
Old 4 Weeks Ago
Clunk's Avatar
Clunk Clunk is online now
Senior Member
 
Join Date: Mar 2004
Location: Tennessee
Posts: 9,401
Default

The exhaust temps show sufficient fueling as does the boost pressure.
That leaves timing doesn't it?
__________________
01.5,Red QC Sport SWB,HO,6spd,4x4,cowl hood, Drag Comp,4"ex., fuel press. gauge, boost&pyro gauges, bhaf, single Holley lift pump next to the fuel tank/13psi WOT, Vulcan Big Line, cheapo fuel cooler, Amsoil in the trans. & Valvoline in the pan, 63-65-.70A/R, ARP studs, kevlar/ceramic SD clutch, jammer 100's

Quote:
Originally Posted by jetfueljockey View Post
Doc says I'm in pretty good shape for an 83 year old guy.....one of these days I need to tell him I'm 59.


Time to turn so's you don't burn.
Reply With Quote
  #8  
Old 4 Weeks Ago
Clunk's Avatar
Clunk Clunk is online now
Senior Member
 
Join Date: Mar 2004
Location: Tennessee
Posts: 9,401
Default

Have you seen this?

http://www.dieselram.com/showthread.php?t=180856
__________________
01.5,Red QC Sport SWB,HO,6spd,4x4,cowl hood, Drag Comp,4"ex., fuel press. gauge, boost&pyro gauges, bhaf, single Holley lift pump next to the fuel tank/13psi WOT, Vulcan Big Line, cheapo fuel cooler, Amsoil in the trans. & Valvoline in the pan, 63-65-.70A/R, ARP studs, kevlar/ceramic SD clutch, jammer 100's

Quote:
Originally Posted by jetfueljockey View Post
Doc says I'm in pretty good shape for an 83 year old guy.....one of these days I need to tell him I'm 59.


Time to turn so's you don't burn.
Reply With Quote
  #9  
Old 4 Weeks Ago
racingskull6670 racingskull6670 is offline
Member
 
Join Date: Dec 2014
Location: chicago, illinois
Posts: 74
Default

Thats what id think as well. Not sure if the combination of vp injectors and bigger fuel lines make that much of a difference on timing. I have it set at around 18* right now. Just bumled up from 16* the other day and it seemed to habe possibly helped a tad. I may try and bump it up more and see what happens. I tried messing with timing before and it didnt fix the issue, but maybe i was fudging it somehow.
__________________
2012 Ram 4500 leveled on 6 custom 20x11, 37x13.5s
G56, custom girdle, valair dd organic, Gearvendors OD
Destroked 6.7 ppumped
Reply With Quote
  #10  
Old 4 Weeks Ago
Clunk's Avatar
Clunk Clunk is online now
Senior Member
 
Join Date: Mar 2004
Location: Tennessee
Posts: 9,401
Default

I've read as high as 30 deg. for melting pistons and 24-26 pullin' a sled.
__________________
01.5,Red QC Sport SWB,HO,6spd,4x4,cowl hood, Drag Comp,4"ex., fuel press. gauge, boost&pyro gauges, bhaf, single Holley lift pump next to the fuel tank/13psi WOT, Vulcan Big Line, cheapo fuel cooler, Amsoil in the trans. & Valvoline in the pan, 63-65-.70A/R, ARP studs, kevlar/ceramic SD clutch, jammer 100's

Quote:
Originally Posted by jetfueljockey View Post
Doc says I'm in pretty good shape for an 83 year old guy.....one of these days I need to tell him I'm 59.


Time to turn so's you don't burn.
Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -6. The time now is 06:36 PM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.
Copyright 2016 www.dieselram.com. All material found on this site is property of DieselRam.com.Ad Management plugin by RedTyger