JDM Tuning Expert advice and discussion on JDM tuning for your S2000.

the Official "NA Tuning" thread

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Old Oct 10, 2006 | 05:42 AM
  #1981  
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Sure it can. The V-AFC stands for Vtec-Air Fuel Controller. If it lets you lean in out, it'll let you richen in as well. Most AP1's run 14.xxx afr just before VTEC (hence the better highway gas mileage when running 85-95 on the freeway). Richen the fuel up right there, and drop your vtec engagement point. It won't hit as hard, but you'll have a ton more midrange power, which will make the car much stronger all around.
Old Oct 10, 2006 | 08:06 AM
  #1982  
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Originally Posted by wildcardtrd,Oct 9 2006, 09:20 PM
your curves look accurate, and your numbers reflect that of an AP1 that's got some time under its belt. Your engine is in need of a good once over...new fuel filter, spark plugs, a top engine treatment (honda's stuff or seafoam, your choice), new pcv valve, injectors cleaned, and is desperately in need of some heat soak medicine. I strongly suggest a Hondata intake manifold gasket. A valve adjustment wouldn't hurt to bad either. Your power peaks off where most un-tuned AP1's do, right around 8200 rpm. My peak was there before I got it tuned as well. You rev to 9 grand, you need to lean out your fuel maps in the upper rpm's, richen them up in the "just before vtec" range, and drop vtec about 300 rpm. You can do all this with a VAFC. To unlock some serious power, you need a 'puter that can adjust timing, but right now, concentrate on some maintenance, and a tune. You'll get a much nicer number, and a more linear curve as well.
whos dyno are we talking about?
Old Oct 10, 2006 | 08:23 AM
  #1983  
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Mine, go back one page its the last post.
Old Oct 10, 2006 | 08:52 AM
  #1984  
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Originally Posted by C U AT 9K,Oct 10 2006, 09:23 AM
Mine, go back one page its the last post.
you've got some problems! check your compression/injectors. something is very wrong there. i was 197 bone stock bro, you've got i/h/e!
Old Oct 10, 2006 | 09:30 AM
  #1985  
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Old Oct 10, 2006 | 10:01 AM
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His dyno reminds me alot of VolkGT-N's before the Fuji ITB's. A compression check would be a nice thing to do, but I think most of his power loss is probably due to a gummed up intake and combustion chambers, as evident by the very wavy dyno plots, especially up in the upper rpm range. That is usually a teltale sign of turbulence and inconsistent airflow...I'll bet his intake manifold, throttle body, and valves are **DIRTY**!!
Old Oct 10, 2006 | 10:42 AM
  #1987  
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Originally Posted by wildcardtrd,Oct 10 2006, 11:01 AM
His dyno reminds me alot of VolkGT-N's before the Fuji ITB's. A compression check would be a nice thing to do, but I think most of his power loss is probably due to a gummed up intake and combustion chambers, as evident by the very wavy dyno plots, especially up in the upper rpm range. That is usually a teltale sign of turbulence and inconsistent airflow...I'll bet his intake manifold, throttle body, and valves are **DIRTY**!!
Run some high quality engine cleaner and get your injectors cleaned.
Old Oct 10, 2006 | 10:55 AM
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well guys, if my exahust sells today its 70mm and vafc or greddy, I can get the emange for 380 i just need the boomslang harness on top of that

so VAFC, or emanage? what do you think the gains of emanage are over just fuel tuning with vacf II??

so excited, i will be dyno'ing ASAP at my work once these are installed.
Old Oct 10, 2006 | 11:21 AM
  #1989  
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Originally Posted by BlownAP,Oct 10 2006, 11:55 AM
well guys, if my exahust sells today its 70mm and vafc or greddy, I can get the emange for 380 i just need the boomslang harness on top of that

so VAFC, or emanage? what do you think the gains of emanage are over just fuel tuning with vacf II??

so excited, i will be dyno'ing ASAP at my work once these are installed.
if you've got a good emanage tuner around get emanage, if you dont, like i do, get the vafc2.
Old Oct 10, 2006 | 11:58 AM
  #1990  
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I know what it is. It's my goddamn intake. I haven't cleaned that thing in over a year!! How do I clean my manifold/throttle body??



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