Supercharged/Turbocharged The increase in air/fuel pressure above atmospheric pressure in the intake system caused by the action of a supercharger or turbocharger attached to an engine.

Lowered Compression

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Old 01-04-2004, 09:27 PM
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Lowered Compression

Alright guys, I just rebuilt a VE30DE for boost. I pushed my compression from 10:1 to 8.2:1 now I am having trouble with idling problems. If you have any ideas how to fix this please drop me a line.
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Old 01-04-2004, 09:48 PM
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what sort of engine management are you using??
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Old 01-04-2004, 09:52 PM
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8.2:1 is a little low, but to fix your idling issue you should try a different plug gap first. Are you boosted now? What plugs are you running? What kind of ignition timing do you have?
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Old 01-04-2004, 09:55 PM
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No Engine Management as of yet. It is not needed yet. I am trying to get the engine in perfect running order by itself before boosting. Is there a certain way to determine gap for the plugs. I am using stock plugs. I have played with the timing a few times and still nothing much better....
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Old 01-04-2004, 10:14 PM
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so where is your timing set at now?? stock?
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Old 01-05-2004, 08:18 AM
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advanced about 5 degrees thats the best i can get it running, the car will idle just not at the 750 it will stay at about 500 until i put it into drive then it stalls at about 300.
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Old 01-05-2004, 08:57 AM
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try raising your idle.
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Old 01-05-2004, 11:41 AM
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I have my idle screw all the way out.
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Old 01-05-2004, 12:30 PM
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its the auto tranny thats your problem

just kidding
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Old 01-05-2004, 12:33 PM
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The 5 speed is sitting in the garage. I am gonna do the swap some time in the next 3 months.... Hopefully. Business is kinda picked up lateley. The better the weather gets the more business I get.
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Old 01-05-2004, 02:28 PM
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just out of curiousity, what exactly did you do to build the motor for boost?
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Old 01-05-2004, 08:12 PM
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Lower compression pistons and total seals rings so far. All internals are HU or forged. I have not upgraded fuel side, thats waiting with the turbo sitting in the shelf in my garage.
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Old 01-05-2004, 08:52 PM
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oh so the car isn't boosted yet?? I dunno man...advancing the timing wou;d have been my guess as well as the idle like ssr said...what plugs are you running??
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Old 01-06-2004, 08:29 AM
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Originally Posted by MadMax92
Lower compression pistons and total seals rings so far. All internals are HU or forged. I have not upgraded fuel side, thats waiting with the turbo sitting in the shelf in my garage.

So whats the trim size on the turbo (assuming a T3/T4oe) and the a/r's? Also, how are you planning the exhaust routing to the turbo?
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Old 01-06-2004, 10:14 PM
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you need to put the blower on there and tune it from start like that. Your gonna end up doing and paying for twice the work bro.

Check the fuel at start, idle engine speed, and if thats all kewl start with about 5 degrees of timing. Really it should all be tuned as it will be in the end from the start.
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Old 01-11-2004, 01:16 AM
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I would think standalone engine management would be needed as the stock computer is applying values that apply to 10:1 cr
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