How much power can stock turbo hold?

[BlueRam2500]

I was reading through DieselDynamics. Com and saw that they make injectors for the 2003-2004. 5 Cummins, but underneath the ad it says that you need an aftermarket turbo and air box to keep down the EGT's. Now, in the turbo section, it says that each truck over 340hp should use this new turbo. Does this mean that the stock turbo in my truck, the HX-35 I believe, cannot handle 400hp, which is easily achievable with an Edge EZ, AFE intake and boost tube, new exhaust manifold, and a free flow 5' exhaust? I am just taking a stab at this, because I am still new to the diesel performance game. I may be just reading it wrong, but nonetheless, I figured I'd ask. Thanks in advance guys

 

[Big MAK]

How much the turbo can hold depends -almost- entirely on how you drive it. The stock turbo will take a lot of power if you don't jump in and out of the throttle. But the concensus seems to be if you're seeing boost above the mid 30s and definitely if about 40 then the turbo's gonna pop sooner not later. Those boost numbers would tend to enforce the thinking that mid 300s for hp is when to start thinking about a bigger turbo.



--edit--

When I had the stock turbo; while towing I let the power gradually build into the mid 30s then it gradually falls off; no problems. That's not nearly as hard on it as stop and go, etc. Again; it's -almost- entirely in how you drive it.

 

[JVolpe]

With Predator Stage II 85hp/160fpt box, AFE air intake, AFE torque tube and stock exhaust I hit 38-39 PSI spike on WOT at drag strip or freeway. Boost PSI would then drop to about 32 and hold as long as WOT. EGTs would go to 1450 and back off slowly.



After a little research this scared the h3ll out of me. Have backed off for now. Trying to decide on new turbo(s) for future.

 

[jwilliams3]

462hp stock turbo 2004. 5 Cummins.

 

[jcarey]

jwilliams3, do you mean that your setup is 462hp on a 2004. 5 or a 2004. 5 stock turbo can handle 462 hp?



If you're referring to your own truck, what do you have on it to reach 462hp?



Thanks,

Jim

 

[mattymac]

What justin is saying is that he made 462 hp and I dont think that he runs around daily with his truck making that much power. I made 450 HP (no pressure box justin!) with all the stock parts except for the air box and exhaust but I run the TST on 5/5 everyday without a hitch. At that level I was 377 HP.

 

[KLockliear]

Really depends on your definition of "handle 400hp".



First, we rate everything by rear wheel horsepower. 400rwhp is a bit more at the motor.



Second, while a turbo may work and stay on the manifold without blowing up, that doesn't mean that it's not a big restriction (and HP loss) vs. a bigger unit. It also doesn't mean that the stock turbo would give you enough air to support that kind of HP without major EGT issues as well.



The website you went to is designed to give direction towards a useable/reliable setup - not just what can be done or made HP wise. I have seen 500hp with a stock HX-35 turbo, but the EGT's went through the roof as soon as you touched the throttle. What good is that?

 

[XcumminsX]

Ha... Mine aint gonna last i get ****** in traffic and hammer down from a stand still alot... And i usually do back off slowly but not if im on the phone or listening to some metal drumming

 

[mattymac]

Ha... Mine aint gonna last i get ****** in traffic and hammer down from a stand still alot... And i usually do back off slowly but not if im on the phone or listening to some metal drumming

Whats it matter if you take off hard from a stand still? Besides you dont have enough power to hurt anything. :-laf

 

[JRG]

I personaly feel that you will fun out of fuel before you run out of air. This is not to say that you can't see an EGT issue, but I can keep my EGT in check with rpm. I can not however increase fuel flow at WOT. I do think that they (air/fuel) are so close that you should do both when you get to that level.



JRG

 

[BlueRam2500]

Really depends on your definition of "handle 400hp".



The website you went to is designed to give direction towards a useable/reliable setup - not just what can be done or made HP wise. I have seen 500hp with a stock HX-35 turbo, but the EGT's went through the roof as soon as you touched the throttle. What good is that?

Thats exactly what I want: a useable, reliable setup that I can drive everyday to and from work and have a little fun with it on the weekends. My concern is that I don't want to damage the motor in anyway but I do want more power.

 

[BRuppel]

tom it's good to see you over here. power is addictive on theses things. what turbos are guys upgrading to on the 04. 5's? im thinking i will need a new one sooner than later and i thin that is what BlueRam2500 is trying to say as well.

 

[DHurley]

I run my tst on 9 and run it hard with the boost at 40 psi and my turbo is still kicking. Although i do have plans for a bigger turbo.