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Old 08-26-2008, 09:45 PM   #1 (permalink)
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Boost limit with Edge Juice

What is the recommended boost limit on the Edge Juice/Attitude for my setup? See sig for details. Stock turbo.

When boost limit is set at 22 the power drops off around 2000 rpm.

p.s. how does the Edge limit the boost does it defuel?
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Old 08-26-2008, 09:54 PM   #2 (permalink)
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Originally Posted by DFLS View Post
What is the recommended boost limit on the Edge Juice/Attitude for my setup? See sig for details. Stock turbo.

When boost limit is set at 22 the power drops off around 2000 rpm.

p.s. how does the Edge limit the boost does it defuel?
I've got basically the same setup and I don't set a limit at all. I sometimes see 32 or 33 psi but haven't had any problems. I've been told that anything over 30 is just a waste on a 2nd gen.
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Old 08-26-2008, 10:09 PM   #3 (permalink)
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OK I did a search(duh) and found that most get max boost levels of high 20's to mid 30's. So I will set it at 35 for now. I was just concerned about pressure blowing something up on the stock system. I see some discussion about studding and oring replacements for hi performance.

22was a number I pulled off a chart from cummins about recommended boost limits.

I will also be wiring my wastegate shut is this really a good idea? I do tow 7000 lbs. every day.
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Old 08-27-2008, 11:23 AM   #4 (permalink)
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OK I did a search(duh) and found that most get max boost levels of high 20's to mid 30's. So I will set it at 35 for now. I was just concerned about pressure blowing something up on the stock system. I see some discussion about studding and oring replacements for hi performance.

22was a number I pulled off a chart from cummins about recommended boost limits.

I will also be wiring my wastegate shut is this really a good idea? I do tow 7000 lbs. every day.
22 lbs is what it should run stock. I don't think you need to worry about headstuds or anything until you start looking at bigger turbos. I don't think I would wire the wastegate shut either. I was told once in the paste that if you mess with the wastegate, your truck WILL come home in a bushel basket
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Old 08-27-2008, 12:53 PM   #5 (permalink)
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I've got basically the same setup and I don't set a limit at all. I sometimes see 32 or 33 psi but haven't had any problems. I've been told that anything over 30 is just a waste on a 2nd gen.
I had mine set to cut off at 39, kind of arbitrary but whatever. It did have 75hp injectors, filter, intake and exhaust though. It would most definitely pull hard up until the point it hit the defuel mark. (which was a whole lot smoother than the ADR's defueling). This was with an hx35 fwiw. When I first got it I had it set at 29 and there was no doubt a lot of power left to be had.
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Old 09-06-2008, 05:20 PM   #6 (permalink)
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with stock injectors you shouldnt get over 33psi really or else its leaning the engine out. and if u have enough fuel more boost is better as long as the ratio is right just anything over like 36psi could damage your stock turbo, u can run it at 36psi max and should be fine
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Old 09-06-2008, 05:58 PM   #7 (permalink)
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with stock injectors you shouldnt get over 33psi really or else its leaning the engine out. and if u have enough fuel more boost is better as long as the ratio is right just anything over like 36psi could damage your stock turbo, u can run it at 36psi max and should be fine
mmmmm diesels dont have a throttle body..... and unless your blowing black you are leaning it out, thats how they work.

if you truck is an auto you wont make much more than 22psi unless you clamp the wastegate shut. 17-19psi is stock with an hy35
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Old 09-06-2008, 07:00 PM   #8 (permalink)
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[QUOTE=Rollin Coal;833290]mmmmm diesels dont have a throttle body..... and unless your blowing black you are leaning it out, thats how they work.


I disagee on the blowing black part. The black smoke is partially unburnt fuel. A perfectly running diesel with just the right ratio of fuel and air will produce just a slight haze.
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Old 09-06-2008, 07:25 PM   #9 (permalink)
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i agree with dwanner blowing black is running rich, black smoke=unburnt fuel, the perfect mixture wouldnt have smoke...and i didnt say anything about a throttle body at all so i dont know where u got that from...since they are electronic the computer wont allow the truck to over boost cuz itll lean out and blow up...hence why once u put injectors in the boost goes up, and an auto doesnt have the same turbo as the standard does
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Old 09-06-2008, 07:41 PM   #10 (permalink)
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are you reading what im typing?

you said more than 33 psi and your leaning the engine out.

i replied a diesel is "leaning out" 95% of the time..... thats how engine speed is adjusted. there is no throttle body, it has an open hole, you want to idle, you remove fuel, to 80:1, 100:1 air/fuel ratios. you want more engine speed, you add fuel. the only time a diesel isnt "lean" is when its rich..... blowing black. aka, dumping more fuel than is buring.... again..... rich.....
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Old 09-06-2008, 08:56 PM   #11 (permalink)
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but when the fuel stops goin in so does the air, the boost doesnt stay the same...so run the same amount of fuel at an idle and put 30psi of boost into it and see what happens..if you run it to lean it will cause the engine to start missing, makes more vibrations and takes bearings out...and if u run to much boost its worse for ur turbo cuz its excessive wear and makes no difference for power cuz theres no more fuel to burn if its over boosting
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Old 09-06-2008, 09:12 PM   #12 (permalink)
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but when the fuel stops goin in so does the air, the boost doesnt stay the same...so run the same amount of fuel at an idle and put 30psi of boost into it and see what happens..if you run it to lean it will cause the engine to start missing, makes more vibrations and takes bearings out...and if u run to much boost its worse for ur turbo cuz its excessive wear and makes no difference for power cuz theres no more fuel to burn if its over boosting
you're missing the point. a diesel CAN NOT make more boost than it can use. you can completely lock your waste gate shut, and spin your motor to red line, if you have stock sticks, and stock fueling, your not making more than 18ish psi.

my truck made 28 psi with the hx40, waste gate completely closed, edge on 6x5, from 2200 rpm-3200 rpm. I changed nothing but injectors, and now I can hit 40psi all day long.

you can not build boost in a diesel with out fuel, its not like a gas motor.
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