dont all turbos have a wastegate. some aftermarket ones like the aurora 3000 look like they dont. what controls overboost then?

 

do all cummins 3rd gens have wastegates until the vgt in 2008? are all the turbos the same size except for the 2003 and early 2004?

 

Overboost is not really an issue for diesels.

In the gasser world, overboost is a problem due to detonation. Since diesels inject the fuel right at the desired point for combustion, detonation isn't an issue. (there are exceptions to this involving extremely advanced timing but that's outside the scope of what we're talking about).

Wastegates are used when you're trying to use a small turbo to come up on boost very quickly and make the truck feel snappy. They then run out of exhaust turbine flow at high rpm, so you just dump the excess exhaust with a gate.

A properly sized turbo really doesn't need a gate unless you're trying to make it do something unique.

 

Excellent point. All other things being equal, a well-matched combo in terms of fueling, along with appropriate inducer/exducer sizes will perform best all by itself, no WG required.

Modern trucks need wastegates because modern drivers don't know how to drive. It won't feel right to Joe burnout if it doesn't spool instantly.

 

but you have to watch if your head isnt studded and fire ringed wouldnt you?couldnt you build unlimited amount of boost over 40 lbs and crack head gasket?what limits these non wastegate turbos? just design

 

so does the stock 2005 cummins dodge have a wasegate?

 

yes it does... pretty sure most if not all turbo's do.

 

LOLOL!!!!! just noticed your location,,,,,

Scary huh?????????

Nobama!!!!!!!!!!

 

Doing my darndest to get the heck outta here... house is for sale... Going to a more free state.

 

one guy says all turbos have a wastegate, and JDRECKARD sasy he has never heard of a wastegate on a diesel.????i myself have always seen them especially on stock factory stuff like vehicles, semis etc........but i see aftermarket stuff that dont have wastegate?

 

The turbo on my 1st Gen has a wastegate and it is bolted shut (i.e. inop/permanently closed).

 

All our trucks come with a wastegate. Under stock or mildly modified conditions you really don't need it though. I have mine blocked off at the hose so it does not function at all.
Those trucks that are heavily modded need a wastegate because more fuel equals more boost and too much will pop a head gasket....

The aftermarket turbo I used to run had a wastegate...

 

My 91.5 came stock without one.

 

There are 14sq cm turbines w/g'd and non w/g'd for the hx35s and the 16 sq cm turbines are non w/g'd. It depends on if the particular turbo/engine combo needs a w/g to keep drive psi from going to high. My a2k has a huge turbine and no w/g and still spools as fast or faster than the stocker. I don't know how they did it but I love mine. Craig