i have a 93 that has a few mods on it. one of which is a piers diesel hybrid turbo with a lightened flywheell..... thats what i was told anyway. . im getting around 38 pounds of boost with it. is it possiable to get anyomore out of this turbo or can i get a bigger turbo. what would yall recomend for a bigger turbo. thanks im new and im learning lol also have pods and 4 inch exh all the way back from the turbo and pump work and a suncoast stage 3 transmission. . ill post the numbers on the turbo see if anyone knows what it is
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well it looks like a stock turbo it is a LM25S holset not sure what was done to it. . i thought he said it was either a piers. or piers did something to it. i have all the recipts for everthing he has done to the truck. i need to start digging. how am i getting that much boost out of that turbo. is it possable to rebuild the inside to a bigger spec for more boost? the dyno is weird too i had it dynoed and here is what is turned up http://new.photos.yahoo.com/pegglegg32/album/576460762344241887/photo/294928803662665625/0
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We need the model # of the turbo to know if you can get more.
But one thing to remember. The stock head gasket is weak. Your right at the point of it letting go. The magic number is 40 PSI. Very much of it and you replacing a head gasket. Higher boost and your doing fire rings because the stock gaskets can't handle the boost pressure.
Your link to the dyno sheet isn't any good eather.
But one thing to remember. The stock head gasket is weak. Your right at the point of it letting go. The magic number is 40 PSI. Very much of it and you replacing a head gasket. Higher boost and your doing fire rings because the stock gaskets can't handle the boost pressure.
Your link to the dyno sheet isn't any good eather.
Yes I could not download the pic either. You will find plenty of info here on your turbo. All my trucks are box stock so not much help but there are plenty of others who do know lots. From what I read, at 38 pounds, you are on the edge of a very slippery slope into a hugely adictive money pit called bombing.
Have fun.
James
Have fun.
James
http://new.photos.yahoo.com/pegglegg32/album/576460762344241887 see if that one will work guys . . why is 40 pushing it on the 12 valve are there prone to blowing head gaskets on the 12s i was running anywhere form 35 to 45 on my 24 with out any problems.
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That links isn't working eather.
The over valved engines has a better headgasket design than the 12 valves do. Do a search on head gasket in the 1st and 12V 2nd gen sections. High boost and our headgaskets do not get along to good. Most people wanting to push 40 PSI and above end up pulling the head and sending it out to have fire rings installed.
Just post the pic of the sheet on here. It has to be smaller than 32k in size. If you don't know how to cut it down. Email it to me. I'll resize and post it for you. -- email address removed --
The over valved engines has a better headgasket design than the 12 valves do. Do a search on head gasket in the 1st and 12V 2nd gen sections. High boost and our headgaskets do not get along to good. Most people wanting to push 40 PSI and above end up pulling the head and sending it out to have fire rings installed.
Just post the pic of the sheet on here. It has to be smaller than 32k in size. If you don't know how to cut it down. Email it to me. I'll resize and post it for you. -- email address removed --
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Still no pics. I can only speak of design generalities with the pressures. The B is designed with lower compression and higher injection numbers than were the norm for years and years. They also have head bolts instead of studs and nuts. The stud and nut allowing more clamping force. Clearly, the head gasket is a weak point if you raise the boost. Studs and fire rings then become necessary. Both things are somewhat expensive to do but allow a bit more of releaseing the dragon inside the Cummins. It amazes me what some of the guys have accomplished.
James
James
You get more boost by adding more fuel to the truck. If the turbo is a piers 35 than it has a 58mm comp. wheel on it and you are right at the max for the eficency of that turbo. To get more power from the truck witch I'm guessing is what you are trying to do you will need a bigger turbo and more fuel to run it. You could go with an htt upgrade but it wont do much for you for the cost. Your probobly looking at an hx 40 or s300 based super turbo 
from one of the big aftermarket companies. As far as the headgasket goes I think your safe at 38. I've been at 40+ for a year and a half know with no problems. I've heard of guys getting away with 50 and guys blowing them with 35 but seem like most hold out to 40-45 range depending on turbo, intercooler and timing setup. Let us know what exhaust housing you have on it and get us the dyno sheet and we can help more.
good luck
Cade
from one of the big aftermarket companies. As far as the headgasket goes I think your safe at 38. I've been at 40+ for a year and a half know with no problems. I've heard of guys getting away with 50 and guys blowing them with 35 but seem like most hold out to 40-45 range depending on turbo, intercooler and timing setup. Let us know what exhaust housing you have on it and get us the dyno sheet and we can help more. good luck
Cade
Head gasket vs boost
I was under the impression (and my limited personal experience backs this) that the stock nonIC head gaskets were good to about 30psi, with stock or near stock timing. The later, marine grade (only one available now) is good to 45-50. Based on that, you should be ok at 38, and still have some wiggle room left. I pegged the 40spi gauge on my early 91 (after the head gasket job) on a daily basis, and it held just fine. I'd be more worried about the turbo- it is at its peak efficiency now. Do you have a wastegated or non-gated housing?
Daniel
I was under the impression (and my limited personal experience backs this) that the stock nonIC head gaskets were good to about 30psi, with stock or near stock timing. The later, marine grade (only one available now) is good to 45-50. Based on that, you should be ok at 38, and still have some wiggle room left. I pegged the 40spi gauge on my early 91 (after the head gasket job) on a daily basis, and it held just fine. I'd be more worried about the turbo- it is at its peak efficiency now. Do you have a wastegated or non-gated housing?
Daniel
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ok its a pdr1113500 turbo hx35 old style and a 16 mm non wate gated housing?? what is the diff between non and waste gated sorry im new and im trying to learn this man spent 25 grand on this truck im trying to figure out all the mods banks turbo outlet whatever that is . . um pod injectors. . umm suncoast transmission . . umm new intercooler? thats another thing i have no idea what it is . . power pin smokey joes? looks like he did something to the pump i cant tell what and the timing
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http://new.photos.yahoo.com/pegglegg32/album/576460762344241335/photo/294928803662651336/1 here r some pics of the truck guys
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FREE!
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Renew
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Back Issues
Subscription Status
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