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Old 06-27-2019, 08:21 AM   #1
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What N/a performance mods can I do without a turbo?

I’ve been looking into this kind of thing for a while and soon am going to break down my engine for all measurements. I just wanna know what would be some kind of mods I can look forward to doing. Any ideas?


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Old 06-27-2019, 10:50 AM   #2
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What kind of budget?

For any kind of performance modification set, this should always be the first question. Some mods are good bang-for-the-buck, but are ultimately limited. Some are quite expensive for the performance gain that they grant by themselves, but will allow a lot more in the long run.

N/A performance modifications can get very expensive for little gains in power, but cumulatively, with enough of a budget can get quite impressive.

1turbofocus has a thread dealing with doing a complete N/A engine that he makes some impressive claims about here: https://www.focusfanatics.com/forum/...k3-engine.html

That seems to be pushing the limits of what you can do with this block without forced aspiration.

Most of this is more general, since I'm not looking specifically at Focus oriented performance myself.

Below that, are things that are the basics. Intake and exhaust to help the engine breathe a bit better are good ideas, and generally stack well with other modifications, to a point. While I don't think that "you need backpressure" in an exhaust system, I do believe that an exhaust system is best tuned to match the engine for optimum performance, and that might change with higher modification levels, so it's best to choose a system that will match your ultimate goals. Same with intake.

Cylinder head port and polish falls into the same category, help the engine breathe better, and you can process more air, and burn more fuel to make more power. If you're lucky, you can also make the system more efficient, and get better mileage out of it when you're driving nice. I'm not familiar with what's available for cams or oversized valves, but those are also generally good power adders. The cylinder head can be shaved, or a thinner head gasket might increase base compression ratio for more power, too. This may necessitate the use of higher octane fuel to avoid detonation.

Once that's done, you may need to add fuel. Larger fuel injectors, and fuel pumps and pressure regulators may be called for.

If you're still not done, you can change out the pistons for compression, or for more durability with forged parts. Pistons, rods, crank. Some overbore may be available to increase overall displacement, though this isn't likely to amount to much.

Then there's the easy way out. A wet-shot of N2O will give you a nice little kick in the pants if set up well.

Be aware that when it's all said and done, you're probably not going to have a massive difference in power. You will very probably spend more money and have less power than the guy who gets a bolt-on turbo kit.
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Old 06-27-2019, 01:52 PM   #3
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What year Focus do you have ?

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Old 06-27-2019, 05:52 PM   #4
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Quote:
Originally Posted by SupraGuy View Post
Be aware that when it's all said and done, you're probably not going to have a massive difference in power. You will very probably spend more money and have less power than the guy who gets a bolt-on turbo kit.
IDK about that. without doing too much engine work, a 93 octane tune, some well done bolt ons, BSD, cams, and a header will definitely make noticeable power improvements. just don't expect anything over 200 whp without getting in to some major engine work.

to your point... if you do all of those things right, you'll spend the equivalent of a cheap turbo kit and will definitely not have that power.
buuut its not a bad idea to go for less expensive, high quality mods that work well over going with a cheap turbo kit that will ruin your car.
NA power is nice for its simplicity and durability.
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Last edited by Habriant40; 06-27-2019 at 05:54 PM.
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