Duramax Diesels Forum Truck of the Week
  #16  
Old 06-05-2017, 06:54 PM
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IOWA LLY IOWA LLY is offline
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Originally Posted by Ne-max View Post
Isn't Mark running 30k plus rail on some of his builds?


I've ran over 34,000 on competition only stuff.


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  #17  
Old 06-05-2017, 07:01 PM
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Quote:
Originally Posted by Ne-max View Post
Most guys throw them on hoping it fixes a rail issue caused by bad injectors. Usually start with rail plug. Then lift pump the trucks for sale. I have only had 1 test out bad in the last 4 years. Then fought getting race plug to seal.
Yep. I have seen a bunch of true LLY trucks pop them, but when they upped the max rail pressure with the LBZ, they also raised the pop pressure on the relief valve. The only time I have ever seen an LBZ or LMM pop a relief valve is on a truck running a dual CP3 setup. Most people usually install a race valve on an LBZ or LMM because they think or they heard it is a problem. Unless you have verified your valve is leaking or you have an 04.5-05 LLY, you are most likely wasting your time by shimming or installing a race valve.
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  #18  
Old 06-05-2017, 07:46 PM
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zf>allison zf>allison is offline
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Quote:
Originally Posted by JoshH View Post
Yep. I have seen a bunch of true LLY trucks pop them, but when they upped the max rail pressure with the LBZ, they also raised the pop pressure on the relief valve. The only time I have ever seen an LBZ or LMM pop a relief valve is on a truck running a dual CP3 setup. Most people usually install a race valve on an LBZ or LMM because they think or they heard it is a problem. Unless you have verified your valve is leaking or you have an 04.5-05 LLY, you are most likely wasting your time by shimming or installing a race valve.
lly's are bad
My brothers lly I just bought was popping his with a hundred hp tune when he bought it.
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  #19  
Old 06-05-2017, 08:08 PM
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Chevy1925 Chevy1925 is offline
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Quote:
Originally Posted by JoshH View Post
Yep. I have seen a bunch of true LLY trucks pop them, but when they upped the max rail pressure with the LBZ, they also raised the pop pressure on the relief valve. The only time I have ever seen an LBZ or LMM pop a relief valve is on a truck running a dual CP3 setup. Most people usually install a race valve on an LBZ or LMM because they think or they heard it is a problem. Unless you have verified your valve is leaking or you have an 04.5-05 LLY, you are most likely wasting your time by shimming or installing a race valve.

Kinda like the lb7. They don't pop but once they do (if ever), they damn near never seal again

Honestly, I wish the made set pressure ones like the cummins boys can get. Shimming it doesn't do a thing to tell you where it will pop and most guys set it to the point of spring bind or just before so it won't ever open. Or maybe they do and I just ain't looked yet
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02 LL7 2500HD CC/LB dmax/alli "The Limo"

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  #20  
Old 06-05-2017, 08:20 PM
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I think it's funny when people try a race valve to help low rail without doing the super simple bottle test.
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  #21  
Old 06-05-2017, 09:05 PM
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Quote:
Originally Posted by Harbin_22 View Post
I think it's funny when people try a race valve to help low rail without doing the super simple bottle test.


Difference between a mechanic and a parts replacer lol
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02 LL7 2500HD CC/LB dmax/alli "The Limo"

BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

best time to date: 12.39

motor died/bent rods = 3/11/11
back from the dead 7:04pm 4/9/2012

Limo is back in the garage, now driving a built chevy tracker
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  #22  
Old 06-05-2017, 10:15 PM
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I've seen a couple LLYs with bad stock fprvs. I've also had bad race plugs too. If your not having rail pressure problems, probably not worth it unless you are planning a cp3 upgrade.
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  #23  
Old 06-05-2017, 11:20 PM
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Quote:
Originally Posted by Ne-max View Post
Most guys throw them on hoping it fixes a rail issue caused by bad injectors. Usually start with rail plug. Then lift pump the trucks for sale. I have only had 1 test out bad in the last 4 years. Then fought getting race plug to seal.
That was my problem the one time I bought a race valve. I think they probably work fine in the ppe fuel rail they were designed for but mixed results in stock rails in my experience.

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  #24  
Old 06-05-2017, 11:25 PM
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Quote:
Originally Posted by JoshH View Post
Yep. I have seen a bunch of true LLY trucks pop them, but when they upped the max rail pressure with the LBZ, they also raised the pop pressure on the relief valve. The only time I have ever seen an LBZ or LMM pop a relief valve is on a truck running a dual CP3 setup. Most people usually install a race valve on an LBZ or LMM because they think or they heard it is a problem. Unless you have verified your valve is leaking or you have an 04.5-05 LLY, you are most likely wasting your time by shimming or installing a race valve.
The race valve I installed was on my lly because the stock one wouldn't stop opening with my tow tune towing my camper. It came out when I couldn't get it to seal and I shimmed a new lbz one and it was good after that.

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  #25  
Old 06-06-2017, 06:01 AM
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WolfLLY WolfLLY is offline
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Quote:
Originally Posted by Chevy1925 View Post
Kinda like the lb7. They don't pop but once they do (if ever), they damn near never seal again

Honestly, I wish the made set pressure ones like the cummins boys can get. Shimming it doesn't do a thing to tell you where it will pop and most guys set it to the point of spring bind or just before so it won't ever open. Or maybe they do and I just ain't looked yet
Exactly, when you shim the valve you have no idea where the new pop off pressure is set. Could be 80,000psi for all you know. So that kinda throws the whole "I like safety backup" argument out the window.
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  #26  
Old 06-06-2017, 06:37 AM
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zf>allison zf>allison is offline
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Quote:
Originally Posted by WolfLLY View Post
Exactly, when you shim the valve you have no idea where the new pop off pressure is set. Could be 80,000psi for all you know. So that kinda throws the whole "I like safety backup" argument out the window.
That's why I just plugged mine, either way damage can occur more than likely plugged or shimmed. Guess that's why it's a race plug not a safety plug lol.
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serious weight reduction
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  #27  
Old 06-06-2017, 08:51 PM
joecool752 joecool752 is offline
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Quote:
Originally Posted by 04jimc View Post
Doesn't sound like an issue or at least not long enough of a test. Are these the same conditions as before?

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Quote:
Originally Posted by IOWA LLY View Post
I totally agree with this statement, however, I honestly don't believe that the pump is capable of making enough pressure to burst anything.

I've tried my share of stupid things, and had some problems over the years on various trucks that caused some wicked high rail pressures, but have never broke anything on an LLY and newer fuel system from to much pressure.

I install a ton of race valves. Never once had an issue. But there is a trick to installing them.


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  #28  
Old 06-07-2017, 05:11 AM
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Quote:
Originally Posted by Ne-max View Post
Most guys throw them on hoping it fixes a rail issue caused by bad injectors. Usually start with rail plug. Then lift pump the trucks for sale. I have only had 1 test out bad in the last 4 years. Then fought getting race plug to seal.
That has been my experience
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  #29  
Old 07-17-2017, 06:00 AM
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Quote:
Originally Posted by JoshH View Post
Yep. I have seen a bunch of true LLY trucks pop them, but when they upped the max rail pressure with the LBZ, they also raised the pop pressure on the relief valve. The only time I have ever seen an LBZ or LMM pop a relief valve is on a truck running a dual CP3 setup. Most people usually install a race valve on an LBZ or LMM because they think or they heard it is a problem. Unless you have verified your valve is leaking or you have an 04.5-05 LLY, you are most likely wasting your time by shimming or installing a race valve.
This past Friday we were driving on the interstate with the cruise set at 70mph towing our TT when I heard a muffled "pop" and the check engine light came on. Engine wouldn't go above 2000 rpm. Got to our campspot and went into town and the local NAPA pulled a P0087 code. Stock LBZ running an IdahoRob tow tune.
Air temp was 106 degrees. My friends 6.0 Ford engine light came on 15 minutes before mine. We did not fuel up at the same station but we did leave our trucks idling for 20+ minutes while we shopped for groceries (wives & dogs in the trucks).
This was the first time the P0087 code has happened. Truck is a 2007 LT1 Classic with 72k miles and has run the same IdahoRob tune since it was 6 months old in April of 2007.

Does high ambient air temp have an affect on the fuel or fprv valve?
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  #30  
Old 07-17-2017, 06:44 AM
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Google. It's your friend. This subject has been thoroughly covered multiple times...
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