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08-27-2018, 10:41 AM
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#41
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Name: gman99
Title: Diesel Enthusiast
Status: Not Here
Join Date: Sep 2012
Member`s Gallery
Posts: 224
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That is insane. I can't believe that those turbos were still putting out that much boost. That was a huge leak! Glad you got it sorted out
__________________
98 QCLB 4x4 12V, ARP625+ Studs, 14mm mains NonIC pistons, Ported head, Marine Cam, Hamilton Pushrods and Tappets, BeeHive springs HE351cw over Billet S475, 4KGSK, 5X.018's, 7mm DV's, 24 Degrees Timing, 5" Exhaust, TCS Input, DPC Converter, Firepunk Competition Rebuild Kit
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08-27-2018, 10:56 AM
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#42
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Name: Big Blue24
Title: Comp Diesel Sponsor
Status: Not Here
Join Date: Jan 2008
Location: Cedar City, UT
Member`s Gallery
Posts: 6,310
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Yes, on mild"ish" turbo setups using 68mm or smaller turbine wheel setups, I've always gone faster shifting at 3k rpm. Even with the 73mm turbine on the Junker with the big HT80 89mm atmosphere, I still only shift at 3500 rpm or so. I'd say the sweet spot on that setup is 2700 to 3600 RPM.
__________________
95' 2wd Junker Drag Truck
1502 HP Fuel-Only 12mm P7100 Pump
SXE 472 over GTX55 116mm
OEM 12v Block
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08-27-2018, 03:58 PM
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#43
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Name: Redrider2911
Title: Too Much Time
Status: Not Here
Join Date: Nov 2015
Location: Yakima, WA
Member`s Gallery
Posts: 780
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Quote:
Originally Posted by Big Blue24
Yes, on mild"ish" turbo setups using 68mm or smaller turbine wheel setups, I've always gone faster shifting at 3k rpm. Even with the 73mm turbine on the Junker with the big HT80 89mm atmosphere, I still only shift at 3500 rpm or so. I'd say the sweet spot on that setup is 2700 to 3600 RPM.
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Noted. Thanks! Looks like there isn't any races for a few weeks. But I will definitely play around with lowering the shift points at that time and report back!
Kris
__________________
49 Willys Pickup. 5600lb. 11.8sec @115mph 1/4. 12 valve. MegaSquirted 47RH. 3.54 posi rear. 35" tires. 64mm HE351ve, S475 (75/96/1.32), A/W Intercooler. AFC mods. 5x16s. 191 DVs, 180 pump. 23*. 85psi. Build Thread
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09-21-2018, 10:16 AM
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#44
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Name: Redrider2911
Title: Too Much Time
Status: Not Here
Join Date: Nov 2015
Location: Yakima, WA
Member`s Gallery
Posts: 780
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So I found another problem point the other day where I am losing air; the whimpy stock intake plenum plate has had trouble keeping the gasket from blowing out. So I lasered out a 3/8" solid aluminum plate and at the same time rebuilt my intercooler tanks from scratch to make sure I had good welds and no chance of blowing out again.
Truck has been GREAT, until this morning where I blew the headgasket. 90psi of boost up a grade, 90% throttle, 110psi of drive. Probably at somewhere around 2500rpm if I had to guess. Oil puking out of the radiator oilflow.
I have 625 ARPs torqued to 145ft/lbs with diligent retorques though the last retorque was probably 6 months ago. Running an OEM Cummins gasket, and have stainless orings with .010" crush. What can I do to keep this headgasket intact? Defuel it until a higher RPM?
Thanks,
Kris
__________________
49 Willys Pickup. 5600lb. 11.8sec @115mph 1/4. 12 valve. MegaSquirted 47RH. 3.54 posi rear. 35" tires. 64mm HE351ve, S475 (75/96/1.32), A/W Intercooler. AFC mods. 5x16s. 191 DVs, 180 pump. 23*. 85psi. Build Thread
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09-21-2018, 10:33 AM
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#45
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Name: 95cummins5.9
Title: Old man ***** gossiper
Status:
Here
Join Date: Jun 2012
Location: U.S.A
Member`s Gallery
Posts: 4,720
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Pull some timing would help.
__________________
Quote:
Originally Posted by jfaulkner
puzzy, tune it.
I don't own anything stock, from engines to boobies I've modded them all. Life is too short to live with mediocre chit.
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09-21-2018, 10:39 AM
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#46
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Name: Redrider2911
Title: Too Much Time
Status: Not Here
Join Date: Nov 2015
Location: Yakima, WA
Member`s Gallery
Posts: 780
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Quote:
Originally Posted by 95cummins5.9
Pull some timing would help.
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But then I would lose some fun. lol Am I shooting myself in the foot by daily driving this and wanting to race it on the weekend? I thought that should be doable at my power level...
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49 Willys Pickup. 5600lb. 11.8sec @115mph 1/4. 12 valve. MegaSquirted 47RH. 3.54 posi rear. 35" tires. 64mm HE351ve, S475 (75/96/1.32), A/W Intercooler. AFC mods. 5x16s. 191 DVs, 180 pump. 23*. 85psi. Build Thread
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09-21-2018, 10:56 AM
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#47
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Name: 95cummins5.9
Title: Old man ***** gossiper
Status:
Here
Join Date: Jun 2012
Location: U.S.A
Member`s Gallery
Posts: 4,720
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I dont think your asking too much. Purple power works good in the coolant system for cleaning the mess
__________________
Quote:
Originally Posted by jfaulkner
puzzy, tune it.
I don't own anything stock, from engines to boobies I've modded them all. Life is too short to live with mediocre chit.
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09-21-2018, 11:51 AM
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#48
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Name: Redrider2911
Title: Too Much Time
Status: Not Here
Join Date: Nov 2015
Location: Yakima, WA
Member`s Gallery
Posts: 780
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Quote:
Originally Posted by 95cummins5.9
I dont think your asking too much. Purple power works good in the coolant system for cleaning the mess
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So then would you suggest to maybe run 18* or so for DDing and then retime it every time I want to race? Or maybe I just simply waited too long between retorques....?
__________________
49 Willys Pickup. 5600lb. 11.8sec @115mph 1/4. 12 valve. MegaSquirted 47RH. 3.54 posi rear. 35" tires. 64mm HE351ve, S475 (75/96/1.32), A/W Intercooler. AFC mods. 5x16s. 191 DVs, 180 pump. 23*. 85psi. Build Thread
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09-21-2018, 12:01 PM
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#49
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Name: jasonc
Title: Too Much Time
Status: Not Here
Join Date: Nov 2009
Member`s Gallery
Posts: 4,412
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Don't lug it down so low in the rpm range.
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09-21-2018, 12:03 PM
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#50
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Name: jasonc
Title: Too Much Time
Status: Not Here
Join Date: Nov 2009
Member`s Gallery
Posts: 4,412
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Loosen up the gate, or the vanes, so it doesn't make so much boost and torque that early.
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09-21-2018, 01:07 PM
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#51
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Name: Redrider2911
Title: Too Much Time
Status: Not Here
Join Date: Nov 2015
Location: Yakima, WA
Member`s Gallery
Posts: 780
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Quote:
Originally Posted by jasonc
Don't lug it down so low in the rpm range.
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Yea, I was trying to do some visual logging of drive pressure vs boost vs egt to see how everything was running. Keeping an eye on everything up a steep grade tends to be the easiest to do since you can control vehicle speed under load a lot easier. I guess overdrive up a 10% or more grade with that much boost at that low of rpm is a no-no. lol
__________________
49 Willys Pickup. 5600lb. 11.8sec @115mph 1/4. 12 valve. MegaSquirted 47RH. 3.54 posi rear. 35" tires. 64mm HE351ve, S475 (75/96/1.32), A/W Intercooler. AFC mods. 5x16s. 191 DVs, 180 pump. 23*. 85psi. Build Thread
Last edited by Redrider2911; 09-21-2018 at 01:17 PM.
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09-22-2018, 02:48 AM
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#52
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Name: Big Blue24
Title: Comp Diesel Sponsor
Status: Not Here
Join Date: Jan 2008
Location: Cedar City, UT
Member`s Gallery
Posts: 6,310
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ARP recommends 150 ft lbs with those studs (625's), most go a touch over the recommended torque spec, so I'd say you're a little light on the stud torque at 145 ft lbs. With cheaper ARP 2000 studs, I was never able to keep the headgasket alive with orings until I torqued them to 155 ft lbs cold, warm retorque , warm retorque after a couple hard runs, warm retorque again untill they quite moving during the retorques.
__________________
95' 2wd Junker Drag Truck
1502 HP Fuel-Only 12mm P7100 Pump
SXE 472 over GTX55 116mm
OEM 12v Block
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09-22-2018, 02:10 PM
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#53
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Name: Redrider2911
Title: Too Much Time
Status: Not Here
Join Date: Nov 2015
Location: Yakima, WA
Member`s Gallery
Posts: 780
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Quote:
Originally Posted by Big Blue24
ARP recommends 150 ft lbs with those studs (625's), most go a touch over the recommended torque spec, so I'd say you're a little light on the stud torque at 145 ft lbs. With cheaper ARP 2000 studs, I was never able to keep the headgasket alive with orings until I torqued them to 155 ft lbs cold, warm retorque , warm retorque after a couple hard runs, warm retorque again untill they quite moving during the retorques.
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Shoot shoot. Good catch Will. I don’t have the 625s i have the cheaper 2000s. But ok, it sounds like i should take them to 155ftlbs next time.
__________________
49 Willys Pickup. 5600lb. 11.8sec @115mph 1/4. 12 valve. MegaSquirted 47RH. 3.54 posi rear. 35" tires. 64mm HE351ve, S475 (75/96/1.32), A/W Intercooler. AFC mods. 5x16s. 191 DVs, 180 pump. 23*. 85psi. Build Thread
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