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Unread 07-20-2006, 01:26 AM   #1
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Post Performance Tuning Methods and definitions Guide.

This guide was intended to inform people on ways to get more performance out of your engine. This does not cover how to perform the modifications listed in this guide. I may post some simple engine mods in the future, but due to the sheer number of cars made over the years I cant post every modification that is available. Further more I created this to shed light on how the internal combustion engine and ways to add more power. If you have any questions feel free to PM me ill be glad to help

Ways to add power are done in a few ways, but to do this you need to better understand how an engine works. First off the engine can be looked at like a big pump. It sucks in air through the intake, then blows it out the exhaust. The air that is sucked in is also compressed with fuel in it and also ignited. We will call this Suck, Squish, Bang, and Blow.

SUCK: The art of getting more air into the engine there for allowing more fuel and making more horsepower.
Warning adding more air is a good thing until your fuel system can't handle the additional fuel requirements!!
Ok how to make your car suck better. Well there are a couple of ways to do this you can add an Intake system. In this process you are opening up the restrictions of airflow to your engine. You can also replace or polish the inside of your intake manifold to add flow to the engine as well. Another way to add airflow is to get a larger throttle body, which allows for more air to flow into your intake manifold. Another way to do this is to change your intake cam shaft on DOHC (Dual Over Head Cam) cars Increasing your cam lobe to allow it to be open longer and allow more air in, Single cam cars control both the Suck and Blow on the same cam but you can change it as well. You can also increase the intake valve size, and pollish your intake valves to increase airflow. Warning increasing your cam lobe requires you to idle at a higher RPM than stock which will cause you to not pass emissions in most states. This is not the case with engines with variable valve timing as they change to the higher lobe at around 5000 rpm. Some of the more advanced Car tuners out there might say, What about Turbo? NOS? Supercharging? Well this isn't actually Normal sucking it is what we like to refer as force feeding or forced induction. That is my next topic under Suck.


Forced Induction:
The art of cramming air into an engine to raise the pressure above standard atmospheric levels. AKA Boosting, Nitro, or Blowing.
Warning Forced induction puts heavy strains on your engine and may require replacing internal parts. Ok let me start off with the basics to forced induction you will need to upgrade your fuel system I cannot stress this enough if your fuel system can't hang it will destroy your engine in a few days. So what needs to be replaced? You need to get a new fuel pump, fuel pressure regulator, and new fuel injectors. You might also need to strengthen your engines internal components. One of the weakest links in the honda family of engines is the open block deck this is where the cylinder walls should be touching the top of the engine block, on hondas it doesnt. So you need to get a deck brace or sleeve kit, it's called so many things. Once you have done that the honda engine components are pretty strong they should make it to 400 horsepower with descent fuel management and ignition system. You also need really good monitoring systems to let you know what's going on in your system. This is just the basics of what you need!!! Ok onto how it works. Ok well there are many different types of forced induction. I will break them down so you better understand them.


Turbochargers:
An exhaust driven air pump that forces air into your engine.
How it works. A turbo is installed on a custom exhaust manifold; the exhaust comes out of the engine and spins an impeller up to high speeds. The Impeller is connected to a compressor wheel by the CHRA or center housing rotating assembly) the compressor wheel spins at the same speed as the exhaust impeller and when it reaches a certain speed the turbo begins to boost. One problem with turbos is that they don't produce boost at very low RPMs so your engine performs at stock when at low RPMs. This lack of power is called TURBOLAG. With a properly tuned turbo your small 4 cylinder engine can produce more than a Dodge Viper. Considering that most Hondas weigh less than 3000 pounds they can get to insane speeds pretty quick. In the import racing world turbocharged cars have ran 8 second quarter miles times on front wheel drive cars which is impressive, and on Rear wheel drive cars the times a bit faster 6 seconds. Top fuel dragsters are running 4 second runs on the quarter mile.

Superchargers: Supercharges Also known as blowers force air into your engine by compressing air much in the same way as a turbocharger, but instead of letting the exhaust spin the CHRA it uses a pulley connected to the crankshaft pulley. What is good about superchargers? They make boost at all RPMs. What's bad about them? Well there not as efficient as a turbo charger due to parasitic drag of the supercharger. This means that a turbo car @ 6pounds of boost will create more horsepower than a supercharged car @ 6 pounds of boost. This isn't a big deal if you have a 9 liter funny car motor thats making 2500 horsepower but to a little Honda that makes 400 hp it's a big deal. For Hondas supercharging can be done but will not create the big numbers that turbos do.
Nitrous Oxide System: (N2O) NOS.
Nitrous is what some people would call Chemical forced induction. Nitrous adds air in a purely different way than standard forced induction systems. The way Nitrous adds air is by adding N20 to the airstream with added fuel. The N20 Boils and reduces temps by about 70-80°f , as a general rule of thumb for every 10° drop in air temperature you get a 1% increase in horsepower .When N2O gets compressed it reaches a temerature of 565°f the N2O breaks down the Two nitrogen atoms and releases the oxygen. This is all there is too it the extra air and fuel goes into the combustion chamber and burns with the extra air and fuel making more horsepower. thats pretty much all I can say about Nitrous. The good thing about it is that your engine remains stock while not on the bottle so you save money on gas. Some Nitrous systems are button activated and boost when you push the button, like in Fast and the Furious. There are alot of the new systems that activate themselves when your foot reaches the floor .


Ok well that pretty much covers the SUCK part of the guide and now onto....


SQUISH: The Compression stroke on a four stroke engine.
Ok there isn't very much you can do to improve the squish of your engine. About the only thing you can do is to add higher compression pistons to your engine. This can add a significant amount of horsepower to an engine if everything is done right. If your car is a daily driver I dont recomend going above 13:1 compression ration on pump gas. and anyone with modifications to your engine should only run the highest octane gas you can get. If you get the cheap stuff your engine will most likely start to have detonation problems. This is called knocking amongst gear heads. If your engine knocks for too long it will burn a hole in either your cylinder wall or your pistons. Either way you look at it detonation will Burn a hole in your wallet!

Ok so now that SQUISH is out of the way lets move on to BANG


BANG: The act of combustion.
Combustion is when your spark plug ignites the air fuel mixture in your engine. ways to improve this is by adding more spark. you can do this by increasing spark plug wire size, adjusting your spark plug gaps, and by adding aftermarket ignition systems. Replacing ignition components don't tend to give you as much horse power as the ways described in SUCK but if you do any major modifications your going to need a better ignition system to ignite all the added fuel and air. Also its a nice way to dress up your engine bay by adding pretty spark plug wires in your engine.


BLOW:
The act of expelling spent fuel and air.
Here we go, BLOW is everything related to the exhaust side of the engine. If you dont change your exhaust system then your force fed sport compact won't be able to breath and you will loose horsepower. Things you need to change on the exhuast side. for beginners its always nice to change your exhaust from the Catalytic converter back to your tail pipe. this looks better than the stock straw that comes out of the back of your car and generates a slight increase in horse powermaybe 5-10 horsepower on a non force fed car, and 15+ on a Force fed car. The next thing to change would most likely be your exhaust manifold. You replace your exhaust maniflod with a Header which does the same thing but just flows better allowing more air to exit the engine and therefore making more power. Some people replace the catalytic converter with a race pipe which makes good horsepower but is not street legal. I would recomend adding a high flow racing Catalytic converter this will do about the same thing. youcan also change the exhaust camshaft on DOHC (Dual Over Head Cams) cars to allow for better exhaust flow, on single cam cars you can change the cam to increase flow on both sides of the cam.

That covers the basics of the engine, and its many ways to create extra power. In the future I might get more into detail on some of the methods.

Last edited by SpookedJunglist; 09-08-2006 at 02:27 PM. Reason: NOS activists

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Unread 07-20-2006, 03:41 PM   #2
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nice guide

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Unread 07-20-2006, 04:15 PM   #3
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Nice write up Spooked, definetly helped my understanding on the tuning mods listed.

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Unread 07-20-2006, 06:34 PM   #4
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Nice guide! Already taught me stuff. Might want to spell and grammar check it though .

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Unread 07-22-2006, 01:19 PM   #5
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Yeah I know. I just cut and pasted it from Overclock.net. I had a crappy connection at the hotel I was staying at. It was a guide that was pre grammar and spelling on th OC.


Completed. I think I ,ight have missed a few but it looks alot better. I created that a long time ago

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Unread 09-06-2006, 03:06 AM   #6
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hi guys. umm i think that you can also get cold air intakes is that true?
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Unread 09-06-2006, 03:24 PM   #7
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Originally Posted by monkey_boy1990 View Post
hi guys. umm i think that you can also get cold air intakes is that true?
That falls under the suck section ....
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Unread 09-07-2006, 12:26 PM   #8
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Originally Posted by SpookedJunglist View Post
That falls under the suck section ....
Nice write up spooked, very informative. The only thing that bothers me is the NOS thing lol. If I hear nitrous refered to again as NOS(Nitrous Oxide Systems the company) I may shoot myself lol.

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Unread 09-08-2006, 02:32 PM   #9
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Originally Posted by Acturbo View Post
Nice write up spooked, very informative. The only thing that bothers me is the NOS thing lol. If I hear nitrous refered to again as NOS(Nitrous Oxide Systems the company) I may shoot myself lol.
Sorry that you dont like the term. I know they over abused the term in FnF movies. but I have been using the term for a long long time. Before the import scene started using nitrous.

As for "Nitrous Oxide Systems" the company. The companys name is Holley. The division is NOS. I think that it is a good acronym for Nitrous. It saves me 4 keystrokes. After all, all Nitrous systems could be considered NOS. even if holley didn't make it. This is the first time I have seen prejudices towards an acronym. oh well. I fixed the simple write up.
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Unread 09-10-2006, 02:34 PM   #10
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In the "squish" part there are many things you can do to improve the squish and quench of an engine. Though they're not all physically in the chamber, components can be improved upon.

There are a few things to do to your combustion chamber to increase the engine's tolerance to compression. The first and most common is polishing. Polish the combustion chamber to give it less of a chance to develop hot spots. These hots spots can lead to detonation.

The next (and most effective single modification) is the Singh Grooves found at www.somender-singh.com. They are described in more detail in my "Performance through efficiency" post in the Engines subsection of the Car Parts and Maintenance section. They basically allow for higher levels of compression without the worry of detonation.

Combining these two modifications have proven to cause an extremely noticable increase in both efficiency and power when combined with a higher compression ratio.

Last edited by Pinhead; 09-10-2006 at 02:41 PM.

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