Max boost for stock 05' head ?

[HeberRam]

Does anyone know the max boost "safe" for an 05' ? Running close to and at 50 psi right now. Is this too high?

 

[AMassaro]

I was told 40psi was safe for the stock turbo...

Now if that's been taken care of, I think the head/gasket should be ok at 50psi. Stock turbo, not so much...

 

[jwilliams3]

Yeah your ok up to the 50psi ( or more )on the stock gasket as long as its warm and your not shootin drugs to it.

 

[BSwope]

jwilliams, is that true what AMassaro said about 40psi on a stock turbo? I want to start pullin my 06 maybe next year and plan to run the TSTCR, i will have a South Bend DD installed before any thing, but is this ok psi for a stocker, if so how long can i expect it to last?

 

[sick_ram]

Yep, 40 maybe 45 but thats pushing it. They will not last very long, gone through two stockers. 1 the first week I had the truck and the next a few mounths later. The truck stock is pretty much is getting the most out of that turbo, that the charge air is worth a darn. After about 35psi the air is getting super heated and does not do much for power.

 

[mattymac]

Yep, 40 maybe 45 but thats pushing it. They will not last very long, gone through two stockers. 1 the first week I had the truck and the next a few mounths later. The truck stock is pretty much is getting the most out of that turbo, that the charge air is worth a darn. After about 35psi the air is getting super heated and does not do much for power.

35-38 max. The compressor is out of its range by then and just shooting hot air into the motor. Plus turbine speed and Drive pressure is through the roof at the boost pressure your running, which kills the turbo and headgasket because boost is a measurement of restriction, The more restriction, the more pressure on the headgasket.

 

[jwilliams3]

You can pull with a stock turbo but its like racing with a station wagon.

For one its going to get toasty and the performance is going to be lacking in the higher rpms.

 

[AMassaro]

Someone correct me if I'm wrong, please.

The 04. 5's have the hx35? supposedly good up to 35psi



The 05's and up have an hx40? up to 40psi.



Do those hx35-40 numbers correspond to the max safe boost numbers?



If 40psi is not good due to heat/drive pressure, etc. , then why do alot of programmers/boxes allow it and say it's good for "stock" applications. I mean, they don't say you need an upgraded turbo, usually just intake/exhaust mods... etc...

 

[nickleinonen]

Someone correct me if I'm wrong, please.

The 04. 5's have the hx35? supposedly good up to 35psi



The 05's and up have an hx40? up to 40psi.



Do those hx35-40 numbers correspond to the max safe boost numbers?



If 40psi is not good due to heat/drive pressure, etc. , then why do alot of programmers/boxes allow it and say it's good for "stock" applications. I mean, they don't say you need an upgraded turbo, usually just intake/exhaust mods... etc...

03-04 = hy35

04. 5-06 = he351

 

[AMassaro]

Can you tell me the difference between the two?



Thanks

 

[JVolpe]

Well with my mods the SPS66 wastegate is set at 55psi and I have seen it spike to close to 60psi. With the Downloader loaded and boxes up I can hold the wastegate open for most of the quarter. The stock head gasket and bolts have seen at least 50 hard passes of 50psi or more. So far no issues.

 

[mattymac]

Can you tell me the difference between the two?



Thanks

HY9's are an HX 35 compressor side with a tight 9cm2 exhaust housing.

the HE351 is the same turbo with an electronic wastegate actuator for emmissions reasons. both are only efficient to about 35-38 lbs of boost

Well with my mods the SPS66 wastegate is set at 55psi and I have seen it spike to close to 60psi. With the Downloader loaded and boxes up I can hold the wastegate open for most of the quarter. The stock head gasket and bolts have seen at least 50 hard passes of 50psi or more. So far no issues.

The reason you can make 50 + psi safely is because your SPS 66 can move more CFM per a given pound of boost (more air flow, less backpressure) due to mainly a bigger better flowing exhaust housing which means less stress at 50 lbs via an SPS66 over a stock or tighter housed turbo. You still have a ton of cylinder pressure though which also kills HG's.

 

[JVolpe]

HY9's are an HX 35 compressor side with a tight 9cm2 exhaust housing.

the HE351 is the same turbo with an electronic wastegate actuator for emmissions reasons. both are only efficient to about 35-38 lbs of boost







The reason you can make 50 + psi safely is because your SPS 66 can move more CFM per a given pound of boost (more air flow, less backpressure) due to mainly a bigger better flowing exhaust housing which means less stress at 50 lbs via an SPS66 over a stock or tighter housed turbo. You still have a ton of cylinder pressure though which also kills HG's.

I completely agree. I am just waiting to ad the necessary supporting mods to be able to use 50psi from the SPS66 and get cool air and equal drive pressure. I do believe that the right setup with the SPS66 can do as good as twins in any situation except for towing heavy.

 

[jwilliams3]

The he351 will support more hp than the 03-04 charger since it has the 62mm compressor wheel (same diameter as many after markets).

 

[AMassaro]

And that's why, (I thought)?, it could push a bit more boost...