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| Forced Induction Discuss topics relating to turbochargers, superchargers, and nitrous oxide systems. |
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#2
03-02-2004, 02:34 PM
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Personally, no, I don't. I feel that you should lower the ratio to between 8:1 and 9:1. You can get away with running on 10:1 with lower boost, an intercooler, very good fuel management, and very good tuning but if you get some bad gas you risk mesing up the engine with some bad detonation. It is better to be safe than sorry, get some lower compression pistons.
Just my advice. 
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#3
03-02-2004, 04:37 PM
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personally I think it is best that you dont go below 9:1 for street applications because most of the time when you are on the street you arent in boost anyways so you rely on the power that the engine makes to get you moving like leaving from stop lights. With an 8:1 your engine would seem verry sluggish so be careful how low you go on your compression. If you do turbo a 10:1 motor I wouldnt go more than a few pounds of boost, and make sure your spark plugs have the right gap for the turbo application, make sure you get a very cold plug, and make sure your run a minimum of premium gas, and get a good air/fuel guage so you can keep an eye on your fuel mixture. Also you need to upgrade the fuel system with a high pressure inline fuel pump and some type of boost dependent regualtor so you dont run lean. If you get any detonation "pinging sound" immediately get the motor out of boost and dont enter boost again until you can find out what was causing it and fix the problem. If you continue to let it detonate you motor will destroy itself.
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#4
03-02-2004, 05:14 PM
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lower compression
So, to lower my compression I would need to:
1. Get an intercooler 2. Good gas (at least 91 octane) 3. use good spark plugs,wires and cap and please let me know anything else. Thanks again polygon
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#5
03-02-2004, 05:31 PM
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Re: turbo 95 prelude w/ratio 10:0:1
NO, lol, no no no...... that does not lower your compression ratio, that keeps your engine from blowing up
 to lower your compression ratio you will need new pistons, compression ratio is a measure of how much the air is getting compressed inside the cylinder, those things just help keep the air/fuel mixture from exploding before spark
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#6
03-02-2004, 05:49 PM
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To lower the compression you would have to buy lower compression pistons or decrease your stroke. I would agree with quick95civic that 9:1 is a good compression ratio for the street and with moderate boost levels. You can find 9:1 pistons for turbo applications at any shop that would sell a turbo.
Running an intercooler helps cool the intake charge. This helps reduce the chance of detonation. Colder air also equals more power. Running 91+ octane also helps reduce the chance of detonation and is a must for vehicles with forced induction. Using a better ignition system will help make a little more power as well as help with detonation if you use a colder range spark plug. All these things help combat detonation, which is one of a forced induction engines worst enemies. None, however, will lower your compression ratio.
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