Fuel Injection Systems Melbourne | Dyno Tuning Melbourne
Fuel Injection Systems Melbourne | Dyno Tuning Melbourne
Dyno Tuning Melbourne - Turbo Myths
There are some really big misconceptions when it comes to fitting turbos up to engines.
You can have two identical cars, two different turbos, both running 10 PSI of boost, and both producing radically different amounts of power.
If you're running too small a turbo, to get 10 pounds of boost out of, lets say, a 4 litre Ford, for example. If you have a relatively small turbo, and that turbo was running so hard and so fast, that it was way outside of its efficiency curve, it's working too had to compress the air, and it is running very inefficiently. That 10 pounds of boost pressure is really not going to be effective.
The air is going to be hotter than a turbo running within its efficiency curve. You are going to have restrictions with compressor housings, and with ports being too small on the exhaust side. Yet, it's going to spool up quickly and be nice off the line, but you are going to lose boost at the very top.
If you put a bigger turbo on, you've got very little exhaust restriction, and the air is not being worked as hard, so you now have cooler air going into an intercooler or straight into the engine, which is more efficient air, which gives you more power at 10 pound of boost.
Now, finding the fine line, or the sweet spot. Is it too small, or is it too big? Because too large a turbo may not come on boost until 3,000 RPM, whereas a smaller turbo may come on boost at 1,200 RPM.
As a dyno operator, this is where we start to go, "OK, we have a look at what engine package you have, what exhaust system you've got, what manifolds you've got, and try on match the right turbo with that car.
So, it's not a matter of just saying, "I'm going to put a 700 roller on, or I'm going to put a 1,000 roller on, and I'm going to make a million horse power".
It doesn't happen like that. You need to match that turbo to suit that car.
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