How much boost is too much boost for stock 6.4 w/the goodies??? - Ford Powerstroke Diesel Forum
6.4L Performance Parts Discussion What has or has not worked for you?

 
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post #1 of 9 Old 08-15-2013, 12:54 PM Thread Starter
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How much boost is too much boost for stock 6.4 w/the goodies???

I've de-fueled my Mini Maxx at 39 psi. It might be a little low but I don't tend to romp on it hard enough to exceed that in the short bursts I need the extra horsepower. However, after reading plenty of posts on wastegates and the fact that the stock wastegate dumps into the EGR system, how much boost will this engine handle before there is too much? Since the EGR is now disabled, I wonder if even running 39 psi is bad, even as stock I think I never really got over 35-37 psi.

What do I mean by too much? Well for one, head gasket issues. Also, the stock CAC boots, and general wear and tear.


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Last edited by Expirobo; 08-15-2013 at 06:08 PM.
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post #2 of 9 Old 08-15-2013, 02:26 PM
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Your head gaskets will tell you. I've hit 55+ more then a few time and no puking yet.
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post #3 of 9 Old 08-15-2013, 06:07 PM Thread Starter
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Haha, but that is what I'm trying to avoid...the whole head gaskets telling me. I would prefer they never say a word!
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post #4 of 9 Old 08-15-2013, 06:08 PM
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Hard to say. I've seen guys running 60+ lbs on stock CAC boots. And there is no stock wastegate on a 6.4. You misinterpreted as people refer to the egr valve "acting" like a wastegate as the backpressure may push it open after a certain point. And just like the CAC boots, it is also hard to tell on how much your gaskets can take. Main thing is to make sure the truck is up to full temp before romping on it

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post #5 of 9 Old 08-15-2013, 06:11 PM Thread Starter
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I sure love this truck. It's treating me well and I'm taking good care of it. Haven't had it too long but it sure spins like a top. Once I deleted and tuned it, the rocket ship emerged. I read plenty of posts like, "Wow, can't believe how much more powerful it is". Well there's just no way to get the sense of how powerful these engines are until you drive it tuned.
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post #6 of 9 Old 08-16-2013, 04:41 AM
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Quote:
Originally Posted by Expirobo View Post
I sure love this truck. It's treating me well and I'm taking good care of it. Haven't had it too long but it sure spins like a top. Once I deleted and tuned it, the rocket ship emerged. I read plenty of posts like, "Wow, can't believe how much more powerful it is". Well there's just no way to get the sense of how powerful these engines are until you drive it tuned.
Agreed, the 6.4 is a caged animal and when it is out....look out As for too much boost, that is hard to say. You should be fine at 39psi. I used to hit mid-40's and never had a problem. Now I'm studded and I hit 55psi (I have a few goodies too, LOL). However, keep in mind, some people never have head gasket problems, while others blow them stock. You just never know.

Good Luck.

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post #7 of 9 Old 08-16-2013, 06:07 AM
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I have my defuel for boost set at 40 just to be safe.

08 F350 cc/sb 4X4
h&s minimaxx, 5" flo pro, 4" down pipe, no limit cold air intake, dirty diesel EGR delete with intake elbow, 6.0 exhaust manifolds, custom up pipes, ported intake manifold, Apex 71mm LP turbo, Rudy's cold side pipe, diesel site coolant and transmission filter, diesel site intercooler boots, ccv mod, bilstein shocks, gogo dd solenoid, HID lights, Airdog II 165, PMF traction bars, PMF drag link, moshimoto aluminum radiator
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post #8 of 9 Old 08-16-2013, 06:42 AM Thread Starter
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Well, I'm a shade tree mechanic through and through. I intend to pull the heads and stud by myself at some point in the future. I know the drivers side rear stud is a pain but I think I can do it if I jack up the cab a bit. Anyhow, I'm absolutely pleased with the power and mileage now. The wife complained about dropping $2k on the delete setup...that is until she drove it. She had a $hit eatin' grin and hasn't said a word since!
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post #9 of 9 Old 08-18-2013, 08:24 AM
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I was running the Spartan stock tune DPF delete towing my trailer and I hit 44psi.
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