How much boost can you get out of a stock turbo before it blows up? We had our stock turbo up to 38psi today hauling 8 ton of coal. Also does anyone know if there is a difference between the Bully Dog HX-40 and the PDR HX-40. Thanks

 

iv always heard a stock hx 35 wont flow enough air to damage itsself...with the stock 12 housing ive been up to 55 lbs before and its held together :

 

An HX35 gets out of its map with much over 35 psi. Over 35 psi the discharge temp at the comperssor is to hot to gain any advantage, also the drive pressure start to get to high. An HX35 can take more abuse than most turbos but sooner or latter it's going to grenade itself.

 

hey thanks. does anybody know about the turbos in my first post?

 

i don't know about the bullydog 40 but the piers 40 is the bomb!!! if you know what i mean

 

I read on Bully dog site that there turbos are rated for 50 psi

 

When a turbo grenades what usually happens. Do pieces come off into the air intake of the engine. I just put a turnbuckle on mine and now am getting close to 30psi without a load so I want to make sure that I don't destroy anything.

 

If a turbo fails in a big way, one of the wheels can shear off from the shaft and try to find its own way out. This usually only happens under EXTREME levels of fueling and the addition of NO2. Most commonly it is the tubine wheel that seperates from the shaft. In most turbos the turbine wheel is friction welded to the shaft.

The more common failure is the bearing section (also known as the "cartridge&quot failing due to an overboost (overboost = overspeed) or out of balance condition. The slang that seems to have been adopted for this type of failure is "huffed"

I have had the distinct displeasure of "huffing" 2 HX40's and in both cases the turbo(s) were completely ruined due to the bearing failure that let both the hot and cold wheels come in contact with their respective housings. The cartridge was also rendered completely useless.

 

I've read that HX40's come apart because the turbine blades are too large & heavy for hub. Blades are thrown, and the imbalance destroys the bearing first, and then the shaft. HX35's don't have this problem because the hubs are the same as the 40, but the turbine blades are smaller. That's why 40/35 hybrids are a lot more durable than 40's, supposedly.

 

Great, thanks for the information!!!!