12v cummins towing modifications - Page 2 - Competition Diesel.Com

Signature600 · 04-03-2018, 03:18 PM

Quote:

Originally Posted by Snedge

I mean OLD, like the 70 year old guys dad used to hire.

You're old...Not OLD.

Chris

turbo2387 · 04-03-2018, 03:21 PM

Why would you preset a small turbo for 45psi? Your gonna kill it and pop a head gasket while your at it.

jlbayes · 04-03-2018, 03:28 PM

Serioulsy. We are supposed to be a higher end discussion forum and still spreading nonsense like weak shafts and boost is a concern with head gaskets.

turbo2387 · 04-03-2018, 03:48 PM

Excessive drive pressure from a turbo that is way off its map causes no concerns for a HG? Sure wouldnt be where i would be putting my bets in a rig that is gonna be worked hard.

Signature600 · 04-03-2018, 04:42 PM

Quote:

Originally Posted by turbo2387

Excessive drive pressure from a turbo that is way off its map causes no concerns for a HG? Sure wouldnt be where i would be putting my bets in a rig that is gonna be worked hard.

So, 100psi in a exhaust manifold is harder on the head gasket than exploding a finely atomized mixture of diesel fuel in a cylinder full of 400psi compressed air that proceeds to explode subjecting the head gasket to thousands of PSI?

High drive pressure doesn't kill a gasket by itself...bad tuning blows gaskets.

High drive just reduces efficiency...couple that with pushing a charger off it's MAP, and that's why shafts break. I made 638RWHP with a HE551V at 36psi boost, drive would run about 45psi when I checked it. Boost isn't needed if you can move the air.

That same 95 truck I talked about earlier literally had 40+ different turbo setups on it...including a couple of twin sets, one even being a small set that made 86psi boost at god knows what drive...all on the stock head gasket and bolts at 285K-385K miles. The timing was always pretty conservative at 16-17* so that's what I always attributed the head not coming off to.

IMHO,
Chris

Signature600 · 04-03-2018, 04:45 PM

Quote:

Originally Posted by Racinboy18g

So I ended up going with a 60/65/12 turbo with 360 bearing and billet wheel and he machining the 4 3/8 flange on it for me for my fummins conversion since DCS has a pipe already for them. It has the bigger shaft in it not the 7mm one. Adjustable waste gate preset at 45 pounds. And I got 5x12 injectors for it. I think it should spool pretty good and have enough up to.

Back that wastegate down under 40psi and I'll bet it cools off some. I always ran about 38psi, worked well for me.

Chris

Destroked 450 · 04-03-2018, 05:28 PM

Quote:

Originally Posted by Signature600

Valet switch....for when the old guys were driving it.

Old Guys? Wait a minute! I'm an old guy, I've been thinking about putting a valet switch in mine for when the young guys drive it.

Signature600 · 04-04-2018, 06:59 AM

Quote:

Originally Posted by Destroked 450

Old Guys? Wait a minute! I'm an old guy, I've been thinking about putting a valet switch in mine for when the young guys drive it.

You guys weren't old 10 years ago when Valet switches were the rage...

Chris

jlbayes · 04-04-2018, 08:07 AM

Quote:

Originally Posted by turbo2387

Excessive drive pressure from a turbo that is way off its map causes no concerns for a HG? Sure wouldnt be where i would be putting my bets in a rig that is gonna be worked hard.

Yea. All the drive pressure.

malibu795 · 04-04-2018, 10:53 AM

Nice to see those HP numbers out of a 5.9

Destroked 450 · 04-04-2018, 03:22 PM

Quote:

Originally Posted by Signature600

You guys weren't old 10 years ago when Valet switches were the rage...

Chris

That's right, I was in my 50's so still middle age.

ofelas · 04-05-2018, 04:44 AM

Is it true that the injector guide slots in the head do dual duty as boost relief paths, so as to avoid head gasket issues?

jasonc · 04-05-2018, 04:56 AM

What?

Signature600 · 04-05-2018, 06:31 AM

Quote:

Originally Posted by ofelas

Is it true that the injector guide slots in the head do dual duty as boost relief paths, so as to avoid head gasket issues?

What he said...What?

Chris

Nascar · 04-05-2018, 10:10 AM

Quote:

Originally Posted by ofelas

Is it true that the injector guide slots in the head do dual duty as boost relief paths, so as to avoid head gasket issues?

U should use milk with your cereal, not bourbon !!!!

1972RedNeck · 04-05-2018, 09:33 PM

Cinnamon Toast Crunch and Bailey's is dangerous.

04-03-2018, 03:28 PM	#23
jlbayes Name: jlbayes Title: Too Much Time Status: Not Here Join Date: Mar 2011 Location: michigan Member`s Gallery Posts: 2,399	Serioulsy. We are supposed to be a higher end discussion forum and still spreading nonsense like weak shafts and boost is a concern with head gaskets. __________________ Jacob, 97 rclb

04-05-2018, 04:44 AM	#32
ofelas Name: ofelas Title: Too Much Time Status: Not Here Join Date: Oct 2015 Member`s Gallery Posts: 285	Is it true that the injector guide slots in the head do dual duty as boost relief paths, so as to avoid head gasket issues? __________________ Oversized exhaust tips are false advertising, just like the banana shoved down your britches.

04-03-2018, 03:21 PM	#22
turbo2387 Name: turbo2387 Title: Nipple Fluffer Status: Not Here Join Date: Jun 2011 Location: Indiana Member`s Gallery Posts: 665	Why would you preset a small turbo for 45psi? Your gonna kill it and pop a head gasket while your at it.

04-03-2018, 03:48 PM	#24
turbo2387 Name: turbo2387 Title: Nipple Fluffer Status: Not Here Join Date: Jun 2011 Location: Indiana Member`s Gallery Posts: 665	Excessive drive pressure from a turbo that is way off its map causes no concerns for a HG? Sure wouldnt be where i would be putting my bets in a rig that is gonna be worked hard.

04-05-2018, 04:56 AM	#33
jasonc Name: jasonc Title: Too Much Time Status: Not Here Join Date: Nov 2009 Member`s Gallery Posts: 4,412	What?