Holset Turbos on LB7's

duratothemax said:
you asked for advice, so why are you not listening to us?? This isnt a freaking dodge where everyone and their brother runs non-stock turbos/housings/whatever, swapping turbos in the dmax world is like #10 on the "to do mod list".

Ben
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He didnt ask for advice on what to do, and he didnt ask for you to TELL him what to do either. He asked for some specs on Holset turbo's. Just because you wouldnt do it doesent mean it would'nt be good, or cant be done. Just calm down and let him do what he wants to do. Sometimes people would rather do things themselves than to buy a pre-made kit or run the same thing everyone else is running. Just because he isnt buying a bolt on kit, doesent mean it wont work well.

If i had a duramax, would i do this? Probably not, but its his decision and if he carries it out id like to know how well it works.
 
Just curious why not the gt3788r. I had one on my 02 dmax and it was a huge gain over the stock turbo I was nothing but happy with it. It had very quick spool up compared to stock and spooled very well while pulling 20k pound plus trailers. How ever it was a total pain in the a$$ to install but thats the duramax not garrett. By the way I don't have the truck anymore and would sell you the turbo kit if you want.
 
Cummins Driver...your PM inbox is full and you can't receive messages.

I understand everyones initial thoughts when they think of what I want to do. It definately isn't popular...or I'd just do a thread search on any ole Duramax site and read what to do. I too sometimes suggest people do whats always been done or say "why would you want to do that?". Everyone is suggesting what commonly works...and thats all good. I know what they are telling me is good information and is spot on for performance gains.

But like I said...this isn't typical. I like Holset turbos and have messed with them for some time. And I want one on my truck. I guess I just want my truck to be like I want it. Like everyone.

When I go to a truck show or dyno day...I see TONS of things people do to their trucks that doesn't make sense to me or doesn't improve the function of their trucks much at all. Dual 6" stacks do little for performance. But I enjoy looking at them. :) And they sound good right? They sure sell alot of them.

I guess the hardest part of this for me isn't the work. Its getting data on the IHI and Holsets.

Singlecab...thanks for the offer. I'll think about that. But I sure would like the pedestal ;). I know its a complete system however.
 
here is a IHI map and LLY map BD turbo map GT3788

tinkering is cool going form a 3.5" exhuast to 6" stack will drop egts by 100-200* just by that alone and allow quicker turbo spool
 

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NeilLB7 said:
that doesn't make sense to me or doesn't improve the function of their trucks much at all. Dual 6" stacks do little for performance.
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And you think bolting on some holset while keeping the tune stock is going to do something for you?

Someone said they are running an Aurora 4000 with a stock tune? Where did someone say that??

If you are going to put a bigger turbo on AND put a little bit bigger tune in the ECM, then that will work awesome.

Its not that there are no aftermarket injectors for the duramax. There are plenty. But you dont NEED them.

I think you are still way too stuck on the dodge train of thought.

Respectfully, Im no dummy either, Ive built duramax engines and allison transmissions, and Im telling you you are not going to be happy putting some big turbo on with a stock tune. :)

But if you are so adament on doing a big turbo with stock tune, then go for it. Its not going to spool faster than the stock turbo, I can guarantee that right now. ;)

ben
 
I'm determining if a properly built HX50 is too big. If it is...then a properly built HX40 can do the job.

Don't get me wrong. I am NOT trying to ruin my trucks ability to run with the largest turbo I can get my hands on. I won't throw the biggest turbo I can buy under the hood in hopes that it will bolt itself on and instantly give me 500HP at the wheels. I'm not doing that.

I'm trying to replace the IHI with a Holset that will perform as well or better on stock tunes. Is that possible???

Is the IHI that ONLY turbocharger that this engine will ever have?

I'm absolutely being respectful of everyones experience. And I definately never consider anyone a "dummy". Thats why I'm here. Normal people work on these trucks :).
 
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For a stock Duramax Lb7, yes, an HX50 will be a big turbo...of course there are MANY variations of HX50 as well;)

Chris
 
NeilLB7 said:
I'm trying to replace the IHI with a Holset that will perform as well or better on stock tunes. Is that possible??.
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no, its not. Thats what I have been trying to tell you all along. ;)

Dodge guys should NOT be answering this question with their opinion because I realize they have a bazillion different combinations of turbos offered on stock trucks and many times they see a good improvement swapping say a 3rd gen turbo onto a 2nd gen 24v truck or a "swapping a so-and-so cm housing for another cm housing" even if they leave the truck's tuning/fueling stock. That is not the case with the duramax. They are common rail and tuned VERY precisely to run at 100% optimum efficiency and performance with only the stock turbo.

If you want it to run better, just put a little tune on it. :)

ben
 
FWIW, I have run a stock tune with both a BD and HTT aftermarket turbos and it sucked. EGT's were higher and spool up was a lot worse.

I have not tried running a stock tune with my twins but I still cant see it being better than stock.
 
duratothemax said:
Dodge guys should NOT be answering this question

ben
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Why? I've been trying to give him the same answer the whole time;)


An engine is an engine, more displacement means it can handle a bigger charger more effectively, but doesn't make things that much different;)

Putting a Holset on a stock Duramax just because, is completely pointless. The IHI is tougher than an HX40, will outspool and HX50, and probably flow as much (or more) than either one;)

Spend your money somewhere else;) Just because you like Holset's, doesn't mean it's better for your Duramax!
Chris
 
Signature600 said:
Why? I've been trying to give him the same answer the whole time;)


An engine is an engine, more displacement means it can handle a bigger charger more effectively, but doesn't make things that much different;)

Putting a Holset on a stock Duramax just because, is completely pointless. The IHI is tougher than an HX40, will outspool and HX50, and probably flow as much (or more) than either one;)

Spend your money somewhere else;) Just because you like Holset's, doesn't mean it's better for your Duramax!
Chris
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Im sorry, I did not mean any offence when I posted that. Looking back on it, I was an ass for saying it like that. :o:

It was mainly directed at the 12v guys who have less than optimum/precise fueling from the factory, and can benefit from swapping turbos to get better spoolup etc.

The CR CTD guys are in the same boat as the dmax guys..I cant see any point in swapping to another turbo of the exact same size.

Again, sorry I worded it like that.

Ben
 
Figured that's what you meant;)



But I was just screwing with you before...you called my 12v imprecise, so now I'm pi$$ed:hehe: What do you mean they're not optimum? :D

Chris
 
Noreaster said:
Has it even ran yet? Maybe if you didn't spend so much time on the computer it would be done by now:poke:
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duratothemax said:
yeah I have 15,000 miles on it, dick. :rolleyes:

ben
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:owned: :hehe:


and like ben is/was tryign to say the dmax is a very well balanced engine turbo, fueling capcity, rods pistons...abut 550-600rwhp rod and head bolts start to go and running out of fuel as well ( vis loss of rail pressure)

a simple tune will do more for a dmax (power, throttle response, turbo spool) then swaping turbo on a 12v does.

so the OP is an engineer... get EFI live you will spend hours reading thorugh X,Y charts in tuneing the engine. then hours of logging, and adjusting said tune if one want to tinker with the engine that is the money best spent right there.
 
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Thanks for all the input. In all seriousness...I do appreciate the discussion and points of view.
 
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