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| Forum name | Performance/Engine |
| Topic subject | do we need to retard ignition timing with 10.5 compression |
| Topic URL | https://forums.2gnt.com/dcboard.php?az=show_topic&forum=i5&topic_id=22465 |
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22465, do we need to retard ignition timing with 10.5 compression Posted by jamesman, May-07-02 02:59 AM just wondering if we were to run straight 10.5 pistons and no turbo, would we need to retard timing? | |
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22466, RE: do we need to retard ignition timing with 10.5 compression Posted by Michael_97RS, May-07-02 03:42 AM No, timing will be fine. I wouldn't worry about retard until yout hit 12.5:1. | |
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22467, RE: do we need to retard ignition timing with 10.5 compression Posted by jamesman, May-07-02 03:50 AM okay now throw in a turbo, what bout then. | |
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22468, RE: do we need to retard ignition timing with 10.5 compression Posted by iamnotwhoiam, May-07-02 04:02 AM depends on how high you want to boost. i believe you can get away with up to around 8lbs before worrying about timing issues. | |
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22469, RE: do we need to retard ignition timing with 10.5 compression Posted by Michael_97RS, May-07-02 04:12 AM Yeah, then it's just a matter of how much boost you want, if you are building internals to handle boost, then get the retard so you can push the boost. | |
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22470, hrc and retard Posted by pn0ymahal, May-07-02 05:52 AM hey james, well i know u got the higher compression and all, but this is what hrc said. 881 compression retard 1/2 degree per psi with built bottom end, with STOCK compressionnn but with rebuilt bottom end retard 1 degree per psi of boost... this is any stage 3 and above... so since you got 10.5 compression and if u can figure out a formula or use one, from this crappy data of mine you might be able to figure it out... i would assume if you were retarding by boost pressure from one and half to 2 degrees per psi would work, but you also can retard by rpm with ur ignition... i would call bill at hrc and most of all gary from howell to get some #s... | |
