Starting over with my 98 12v..again! Fueling/air questions - Competition Diesel.Com

Rattlin'12v · 11-20-2016, 07:41 PM

I know this is beating a dead horse....

I've decided to do a partial tear down yet again to change some stuff up. I am looking to get the most I can out of my stock flowing 215 pump. I have stock holders, 191s, stock holders, 5x16s, #5 plate, dual fed by a fass220. With that being said, is there any more modifications other than sending it to Seth? What injector size is the max before the pump can't keep up without being maxed and balanced?

Coinciding with the fuel, I recently aquired a set of compounds(366/74/.90-482/96/1.32). The setup is awful rowdy but it seems like a little more fuel, BUTTTTTTTTT, I'm seeing pretty high boost numbers and I don't want to compromise any hard parts including chargers. Along with the boost comes ventilation issues. So I have billet covers and vents coming my way along with a 40mmWG. I also have the head at Kingspeed for o ringing. What is a safe zone for these chargers and everything else? 98psi boost is pretty high, I know a stock flowing head is the main issue there but I'm to poor for a port job!

I'm running a stage two towing cam from colt(per the guy who gave it to me. I can tell it's a aftermarket but going on his word for the specs). The pistons are factory style Mahles.

95cummins5.9 · 11-20-2016, 07:50 PM

I would think that some 100cc 7mm d.v.s would be better than the 191's.

jlbayes · 11-21-2016, 08:56 AM

You would need to figure out the pressure ratios to answer your boost question. I would add another 40mm gate to that if it were me.

Stox5225 · 11-21-2016, 12:06 PM

4K GSK?

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12vCumminsFTW · 11-21-2016, 05:08 PM

that 40mm gate should be plenty. I'd check drive pressure. boost could be a bit high but with a stock head it'll be higher. I've found 12v's like more boost to keep em running cooler. So, if your drive pressure behind the 66 is ok I'd keep driving that secondary harder to get the most from the compounds

11-20-2016, 07:41 PM	#1
Rattlin'12v Name: Rattlin'12v Title: Never satisfied Status: Not Here Join Date: Mar 2013 Location: Westmoreland,TN Member`s Gallery Posts: 9	Starting over with my 98 12v..again! Fueling/air questions I know this is beating a dead horse.... I've decided to do a partial tear down yet again to change some stuff up. I am looking to get the most I can out of my stock flowing 215 pump. I have stock holders, 191s, stock holders, 5x16s, #5 plate, dual fed by a fass220. With that being said, is there any more modifications other than sending it to Seth? What injector size is the max before the pump can't keep up without being maxed and balanced? Coinciding with the fuel, I recently aquired a set of compounds(366/74/.90-482/96/1.32). The setup is awful rowdy but it seems like a little more fuel, BUTTTTTTTTT, I'm seeing pretty high boost numbers and I don't want to compromise any hard parts including chargers. Along with the boost comes ventilation issues. So I have billet covers and vents coming my way along with a 40mmWG. I also have the head at Kingspeed for o ringing. What is a safe zone for these chargers and everything else? 98psi boost is pretty high, I know a stock flowing head is the main issue there but I'm to poor for a port job! I'm running a stage two towing cam from colt(per the guy who gave it to me. I can tell it's a aftermarket but going on his word for the specs). The pistons are factory style Mahles. __________________ Rolling on a budget!

11-21-2016, 08:56 AM	#3
jlbayes Name: jlbayes Title: Too Much Time Status: Not Here Join Date: Mar 2011 Location: michigan Member`s Gallery Posts: 2,399	You would need to figure out the pressure ratios to answer your boost question. I would add another 40mm gate to that if it were me. __________________ Jacob, 97 rclb

11-21-2016, 12:06 PM	#4
Stox5225 Name: Stox5225 Title: Green Behind the Ears Status: Not Here Join Date: Nov 2016 Location: Lillington, NC Member`s Gallery Posts: 97	4K GSK? Sent from my iPhone using Tapatalk __________________ 1997 Cummins 2500; NV4500HD; SB DD; 315/75R16; 3rd Gen Track Bar; 63/65/14; AFC Live; 7mm DV's; 4 GSK; Mac Rack Plug; Custom Fuel System; 5x.012; Colt Cam Big Stick; 60# Springs; PDD Stage 1 Push Rods; O-Ring Head; Head Studs; Fluidampr; Boost/EGT/FP Gauges

11-20-2016, 07:50 PM	#2
95cummins5.9 Name: 95cummins5.9 Title: Old man *** gossiper Status: Not Here Join Date: Jun 2012 Location: U.S.A Member`s Gallery Posts:** 4,720	I would think that some 100cc 7mm d.v.s would be better than the 191's.

11-21-2016, 05:08 PM	#5
12vCumminsFTW Name: 12vCumminsFTW Title: Too Much Time Status: Not Here Join Date: Dec 2010 Location: Willcox, AZ Member`s Gallery Posts: 1,377	that 40mm gate should be plenty. I'd check drive pressure. boost could be a bit high but with a stock head it'll be higher. I've found 12v's like more boost to keep em running cooler. So, if your drive pressure behind the 66 is ok I'd keep driving that secondary harder to get the most from the compounds __________________ -Aaron H. 97 12v 4x4