LT1-LT4 Modifications 1993-97 Gen II Small Block V8

injector ???

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Old Jul 10, 2010 | 08:07 PM
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Default injector ???

at what hp do I need to ditch the stock injectors ,mods are,355 hotcam, 1.7rr,s , 58mm tb, cnc ported heads all boltons .thanx
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Old Jul 10, 2010 | 08:11 PM
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You need to see what % your injectors are flowing at with your mods right now. If they are close to being maxed out then its time to upgrade. SVO redtops are a popular upgrade
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Old Jul 10, 2010 | 08:44 PM
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dont have a local tuner to check them but after the head swap it seems realy lean , almost like its running out of gas when its under load
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Old Jul 11, 2010 | 01:12 PM
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http://www.rceng.com/technical.aspx

Target of course is about 80% or a little under.
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Old Jul 11, 2010 | 01:55 PM
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Was it tuned for the ported heads???

The 80%DC thing is way overstated, that would not worry me atall.
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Old Jul 11, 2010 | 08:37 PM
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Originally Posted by 96capricemgr
Was it tuned for the ported heads???

The 80%DC thing is way overstated, that would not worry me atall.
not tuned for the heads but I wouldnt expect it to throw it this far out of tune , idles fine but slugish and the exaust sounds real crackly and poppy and pops through the intake sometimes when going up any incline, checked and double checked all wires ,plugs ,vaccums , sensors . intake gaskets , about to give up and throw the stockers back on untill I can get to a tuner
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Old Jul 11, 2010 | 09:02 PM
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Originally Posted by snk-huntr
not tuned for the heads but I wouldnt expect it to throw it this far out of tune , idles fine but slugish and the exaust sounds real crackly and poppy and pops through the intake sometimes when going up any incline, checked and double checked all wires ,plugs ,vaccums , sensors . intake gaskets , about to give up and throw the stockers back on untill I can get to a tuner

Under those conditions there is plenty of injector duty cycle left yet you are having troubles. Proof right there of either a mechanical issue or need of a retune.
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Old Jul 11, 2010 | 09:02 PM
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Originally Posted by snk-huntr
not tuned for the heads but I wouldnt expect it to throw it this far out of tune , idles fine but slugish and the exaust sounds real crackly and poppy and pops through the intake sometimes when going up any incline, checked and double checked all wires ,plugs ,vaccums , sensors . intake gaskets , about to give up and throw the stockers back on untill I can get to a tuner
weren't you claiming your car didn't need a tune after you threw the heads on? and now you're having issues... I'd get injectors and then a tune if I were you.
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Old Jul 11, 2010 | 09:15 PM
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had some mild homeported crap on it that didnt affect it any but these cnc,d heads are fully ported and bigger valves but still should run better than it is without a tune , its not running rich at all , plugs look good feels like its loosing comp maybe Idk, how did you guys cars run after heads??
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Old Jul 11, 2010 | 09:16 PM
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maybe one of the head gaskets are leaking ??
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