HaMSaMMiCH Posted October 11, 2009 Report Share Posted October 11, 2009 well, the only reason i asked is because my car idles sometimes at 800-900 RPMs, sometimes (after it has been running for a while) 300-400 RPMs, and sometimes after ive been driving for 10 minutes or so it will idle at either zero or 100 RPMs. I dont really know what the cause of it is and I was wondering what would happen if i changed the idle RPM It's probably not really idling that low. It sounds like your Tach is fucked up. Zero RPM is OFF, and I don't know of any motor that idles at 100 RPM. Most big V8's that idle WAY lower than imports only get down to 500. V6's and 4cyl are typically between 600-900 and ALOT of cars have what is called "high idle" right after start to help the car warm up and get better compression, If it really is idling that high when you start it, as it sounds like your tach isn't giving you any sort of realistic idea of where it is idling.... Quote CAUTION! POOR INSTALLATION MAY SHORT BOTH YOUR SYSTEM AND WALLET Link to comment Share on other sites More sharing options...
HaMSaMMiCH Posted October 11, 2009 Report Share Posted October 11, 2009 1999 Acura Integra 1.8, the alternator is an excessive amperage (200 A) alt that i have had for 2 years and havent really even worked it that much Your tach is DEFINITELY broken. That Honda motor probably won't stay running under 600RPM. Quote CAUTION! POOR INSTALLATION MAY SHORT BOTH YOUR SYSTEM AND WALLET Link to comment Share on other sites More sharing options...
Kranny Posted October 11, 2009 Report Share Posted October 11, 2009 my corolla's 1.6 idles at about 700rpms after warmed up (google) so theres no way yours can idle as low as you say. i vote (again) on broken tach Quote Link to comment Share on other sites More sharing options...
Texas Tech Posted October 11, 2009 Author Report Share Posted October 11, 2009 well, after driving for 10 minutes maybe, the car is warmed up (or whatever, IDK, im not car tech savy), i will push my clutch in for whatever reason and the RPM needle will drop all the way down, what is the tach so i can look into it? Quote Baylor University Accounting Link to comment Share on other sites More sharing options...
Kranny Posted October 11, 2009 Report Share Posted October 11, 2009 (edited) well, after driving for 10 minutes maybe, the car is warmed up (or whatever, IDK, im not car tech savy), i will push my clutch in for whatever reason and the RPM needle will drop all the way down, what is the tach so i can look into it? the tach (or tachometer) is the needle with the numbers 1-8 generally on it. it usually has about 4 little white mark notches between each number edit: ^^ on the left Edited October 11, 2009 by Krannyman92 Quote Link to comment Share on other sites More sharing options...
HaMSaMMiCH Posted October 11, 2009 Report Share Posted October 11, 2009 well, after driving for 10 minutes maybe, the car is warmed up (or whatever, IDK, im not car tech savy), i will push my clutch in for whatever reason and the RPM needle will drop all the way down, what is the tach so i can look into it? Tachometer is the gauge that shows your RPM's. Quote CAUTION! POOR INSTALLATION MAY SHORT BOTH YOUR SYSTEM AND WALLET Link to comment Share on other sites More sharing options...
Texas Tech Posted October 11, 2009 Author Report Share Posted October 11, 2009 so what would i replace to fix it? And i guess that measures the RPMs of the alternator? Quote Baylor University Accounting Link to comment Share on other sites More sharing options...
98crewcab Posted October 11, 2009 Report Share Posted October 11, 2009 so what would i replace to fix it?And i guess that measures the RPMs of the alternator? no, of the motor....... Quote 06 2500hd, 6.0L, 4l80e, 4wd, (muah work truck) 7" BDS HC lift kit (5) 37x13.5R18 Toyo Open Country M/Ts (5) 18x10 Moto Metal MO962 tablet in lieu of deck blue tooth interconnect to soundstream eq (for volume control and bass control) 4 Alpine type r 10's 6 cubes net, 80sqin's port, tuned to 33hz 2 brutus brx5000.5's 2 pairs 3" polk audio for a pillars 4 pairs polk audio 6.5 comps 1 pair 8" polk audio for mids 2 xspower d3400 batteries.....learning alot from meade and his circle of some of the baddest installers ive seen- thanks guys, for not being so cocky and posting the way it should be done!P.S. Thanks Steve....for the demo!!!! loud as fauk! Link to comment Share on other sites More sharing options...
treossi Posted October 11, 2009 Report Share Posted October 11, 2009 (edited) It's probably not really idling that low. It sounds like your Tach is fucked up. Zero RPM is OFF, and I don't know of any motor that idles at 100 RPM. Most big V8's that idle WAY lower than imports only get down to 500. V6's and 4cyl are typically between 600-900my toyota idles at 450-500.... and ALOT of cars have what is called "high idle" right after start to help the car warm up and get better compression, If it really is idling that high when you start it, as it sounds like your tach isn't giving you any sort of realistic idea of where it is idling.... yeah the technical term is called "closed loop/ open loop... google that when you want to learn something... my corolla's 1.6 idles at about 700rpms after warmed up (google) so theres no way yours can idle as low as you say.i vote (again) on broken tach probably Edited October 11, 2009 by treossi Quote Team sundownWESTCOASTSPL.COM we're throwing dbdrag events very soon visit the website for details Link to comment Share on other sites More sharing options...
treossi Posted October 11, 2009 Report Share Posted October 11, 2009 and no it doesn't read alternator rpms... it measures engine rpms off crank sensor Quote Team sundownWESTCOASTSPL.COM we're throwing dbdrag events very soon visit the website for details Link to comment Share on other sites More sharing options...
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