BlownCorona Posted February 25, 2011 Share Posted February 25, 2011 This has been something hanging on my mind for a while, my car seems to redline at ~4000 rpm, it sounds like its at its limit, but 4k seems really low to me, its a Toyota 18r, any input? Quote Link to comment Share on other sites More sharing options...
KKtrips Posted February 25, 2011 Share Posted February 25, 2011 How do you determine your redline - by an actual redline on the gauge or does it just run out of puff at that revs? Quote Link to comment Share on other sites More sharing options...
UTERUS Posted February 25, 2011 Share Posted February 25, 2011 A combination of low compression, valve lift and duration, distributor advance curve and rotating inertia all play a part. Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted February 25, 2011 Author Share Posted February 25, 2011 i have a small after market tacho, and the red line actualy moves, so not that, its that natural point where i feel the engine shouldn't go further. its entirely possible the tacho is wrong mind you, but would a physical problem cause a seemingly low redline but still provide the right feeling for a redline? i guess also possible, is that the redline is supposed to be about 4200. Quote Link to comment Share on other sites More sharing options...
KKtrips Posted February 25, 2011 Share Posted February 25, 2011 It does seem low.. If the engine is tired it could be low on compression - it may have weak valvesprings.. My first recommendation is to make sure the engine is given a good tune, ie replace points, condensor, plugs, air and fuel filters. set tappets and then set the timing, mixture and idle.. Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted February 25, 2011 Author Share Posted February 25, 2011 sounds like a fair plan, as soon as i can get some bolts, im ready to bolt in my weber and tune that, so ill do everything at once and see if it helps, also any other opinions and possible issues? Quote Link to comment Share on other sites More sharing options...
UTERUS Posted February 25, 2011 Share Posted February 25, 2011 Have you considered a 2zz? Do as kk says and report back. Quote Link to comment Share on other sites More sharing options...
fulloc Posted February 26, 2011 Share Posted February 26, 2011 tacho set to 6cyl? Quote Link to comment Share on other sites More sharing options...
phr34kr Posted February 26, 2011 Share Posted February 26, 2011 tacho set to 6cyl? tacho set to 6cyl? This seems very likely as the engine would in reality be doing 6k RPM witch seems reasonable for a redline. Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted February 26, 2011 Author Share Posted February 26, 2011 tacho definitely set to 4, but like i say could be incorrect anyway HOWEVER today, i made up some new gaskets for the carby and gave it a nice tune up (just the carby so far, since i cant get parts to do other stuff yet) and it will now rev out to about 5000-5200 if i pushed it. Quote Link to comment Share on other sites More sharing options...
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