Larger Exhaust Plus Stock Turbo=Worthless
#1
Larger Exhaust Plus Stock Turbo=Worthless
From what I just found on my truck you can run a 20 inch exhaust, if you have a stock size turbo it don't matter, your still runnin the stock exhaust size. I just pulled the stock elbow off the back side of the turbo to replace it with the Megamouth Elbow and what a shocker. The hole on the elbow is even smaller in diameter then the stock exhaust was. Now going under the rule that we use for fuel, that your flow is restricted by the smallest passage way in the flow, then the size of your exhaust means absolutley nothing if you are running the stock exhaust elbow off your turbo.
I will get some pictures posted later in the evening on this to show what I'm talking about. It's scary when you see the restriction.
I will get some pictures posted later in the evening on this to show what I'm talking about. It's scary when you see the restriction.
#2
This photo shows the end that connects to the back of the turbo. The turbo outlet itself is the same size and shape as the whole plate that you see there. So as exhaust is exiting the turbo, as you can see from the black coating half of the exiting gasses are hitting a dead end wall and having to recirculate before escaping. If the porting and polishing we do to the exhaust manifolds make that big a difference in performance, I can't imagine what this is doing to air flow.
This opening measures 2 1/2 inches across for inside diameter. So no matter how big of an exhaust you are running, if you have the stock turbo and elbow you are running a 2 1/2" inch exhaust.
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This is a fairly major issues, gotta be some strong opinions out there someplace about it. Somebody tell me I'm wrong in how I'm lookin at this and explain why. I'm havin a really hard time beleiving that with all the advancements we have made on these trucks that something this critical could go mostly unnoticed.
#10
From what I just found on my truck you can run a 20 inch exhaust, if you have a stock size turbo it don't matter, your still runnin the stock exhaust size. I just pulled the stock elbow off the back side of the turbo to replace it with the Megamouth Elbow and what a shocker. The hole on the elbow is even smaller in diameter then the stock exhaust was. Now going under the rule that we use for fuel, that your flow is restricted by the smallest passage way in the flow, then the size of your exhaust means absolutley nothing if you are running the stock exhaust elbow off your turbo.
I will get some pictures posted later in the evening on this to show what I'm talking about. It's scary when you see the restriction.
I will get some pictures posted later in the evening on this to show what I'm talking about. It's scary when you see the restriction.