How much boost is too much for these motors 43? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 16 (permalink) Old 11-16-2010, 01:47 AM Thread Starter
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How much boost is too much for these motors 43?

I have a h&s black maxx tuned on the 225hp tune. S&b intake and 5" flo pro exhaust. Anyhow I watched my boost and I hit 43 lastnight on 3/4 throttle at 65 accelerating to 90 or so passing. What boost is too much just wondering. What is going to pop because of this pressure?

2008 Job 1 F-250 PSD
H&S Black Maxx
S&B intake
5" Flow Pro from DP Back
Michelin LTX-AT2
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post #2 of 16 (permalink) Old 11-16-2010, 03:34 AM
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I have hit 56 psi before. Stock head bolts didn't like that to much. That was with our older tunes. Our newer tunes have boost toned down in to the high 40's, and it seems to be fine. I have almost 30,000 miles on new head gaskets with stock bolts and have had zero issues.

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post #3 of 16 (permalink) Old 11-16-2010, 06:18 PM
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Are you both referring to actual boost (MAP-14.7) or is this the reading from the MAP sensor?

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post #4 of 16 (permalink) Old 11-16-2010, 06:31 PM
 
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He is refering to actual boost.

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post #5 of 16 (permalink) Old 11-16-2010, 07:26 PM Thread Starter
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I'm referring to boost of dash Gauge and black maxx gauge

2008 Job 1 F-250 PSD
H&S Black Maxx
S&B intake
5" Flow Pro from DP Back
Michelin LTX-AT2
Tow Pkg
Snow Plow Pkg

Legal Disclaimer: Anything I or anyone else says about my vehicle on this website(TheDieselGarage.com or any affiliated or nonaffiliated sites), pertaining to modifications, is only to gain acceptance from my/our peers, and does not actually represent anything actually existing on my truck, and thus, cannot be held against me in any issues, i.e. warranty claims, that may arise.
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post #6 of 16 (permalink) Old 11-16-2010, 08:06 PM
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A stock truck can see 38-40 psi, so 43 psi isn't anything to worry about in my opinion.

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post #7 of 16 (permalink) Old 11-16-2010, 08:31 PM Thread Starter
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I had a guy on another forum say that the stock truck is designed to 41. I just want to know what to believe. I have heard of stock trucks producing that much boost so it would make sense

2008 Job 1 F-250 PSD
H&S Black Maxx
S&B intake
5" Flow Pro from DP Back
Michelin LTX-AT2
Tow Pkg
Snow Plow Pkg

Legal Disclaimer: Anything I or anyone else says about my vehicle on this website(TheDieselGarage.com or any affiliated or nonaffiliated sites), pertaining to modifications, is only to gain acceptance from my/our peers, and does not actually represent anything actually existing on my truck, and thus, cannot be held against me in any issues, i.e. warranty claims, that may arise.
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post #8 of 16 (permalink) Old 11-17-2010, 02:34 PM
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question

Quote:
Originally Posted by 08stroker250 View Post
I have hit 56 psi before. Stock head bolts didn't like that to much. That was with our older tunes. Our newer tunes have boost toned down in to the high 40's, and it seems to be fine. I have almost 30,000 miles on new head gaskets with stock bolts and have had zero issues.
Hey, 08, which of the newer tunes (275, 310, 300, all?) have the lower boost pressures? What is the max tune you can run safely on stock head bolts/gaskets? (In your experience/opinion).

I was under the impression that after the 250, look into head studs and possibly a trans/TC. Is this not the case?

Thanks!

Tim
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post #9 of 16 (permalink) Old 11-17-2010, 05:16 PM Thread Starter
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T613. I have only tried the 250 tune and only once. My truck acted like it was getting flooded while on that setting. I have not seen the 275 and above for the black maxx. Are you asking me what pressures I think are safe. I am unsure I was hoping someone else would answer that question. In my opinion sounds like mid 40s are ok. Casey at h&s said he would personally set the defuel at 45-47 psi. I plan on this weekend taking the boost defuel off and seeing what the max it is I build so I know where to set my levels

2008 Job 1 F-250 PSD
H&S Black Maxx
S&B intake
5" Flow Pro from DP Back
Michelin LTX-AT2
Tow Pkg
Snow Plow Pkg

Legal Disclaimer: Anything I or anyone else says about my vehicle on this website(TheDieselGarage.com or any affiliated or nonaffiliated sites), pertaining to modifications, is only to gain acceptance from my/our peers, and does not actually represent anything actually existing on my truck, and thus, cannot be held against me in any issues, i.e. warranty claims, that may arise.
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post #10 of 16 (permalink) Old 11-17-2010, 06:19 PM
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Quote:
Originally Posted by 08smoker08 View Post
T613. I have only tried the 250 tune and only once. My truck acted like it was getting flooded while on that setting. I have not seen the 275 and above for the black maxx. Are you asking me what pressures I think are safe. I am unsure I was hoping someone else would answer that question. In my opinion sounds like mid 40s are ok. Casey at h&s said he would personally set the defuel at 45-47 psi. I plan on this weekend taking the boost defuel off and seeing what the max it is I build so I know where to set my levels
Sorry 08Smoker, I was directing the question to 08Stroker250, sorry for the confusion!

Tim

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