Remiving boost pill

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May 17, 2011 | 08:28 AM

#16

fostytou

EvoM Community Team

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From: Aurora, IL

Quote:

Originally Posted by Golden

You explain #2 perfectly.

My reasoning for #1 is that I've tuned many, many stock turbos. They don't hit 20 PSI at 7000 RPM on the Stock Turbo without some kind of serious restriction. Even if you weld the Waste Gate shut, you won't see that on a normal X. And by normal I mean normal mods.

You cannot make the stock turbo flow more air, therefor there must be something restricting flow at 7000 RPM preventing air flow. As soon as the engine flows less air than the turbo can push, you will see pressure build up between the engine and turbo... aka boost pressure in the intake manifold.

I'm not saying that this particular application makes more power, what pressure should be, or what a "normal" evo should do... but if pressure and power go up and nothing else is changed... how can you argue that tightening the wastegate/putting in a stiffer spring is not allowing the turbo to create an increase in pressure/(likely power) with the same amount of energy input? Sure, there might be something that could make the engine pump that air more efficiently and bring boost pressure down... but I don't think that is arguable when applied to a 1 changed variable situation.

I'm just not sure how *ONLY* tightening the wastegate -> increase in boost -> increased restriction after the turbo. That increased restriction may very well be the turbine vanes... but its not like the catalytic converter just magically shoved a banana in the exhaust

Where is my disconnect?