Honda Civic DIYs and Civic Tech ChatHonda Civic DIYs and Civic Tech Chat - for the true gearheads! Bring your wrench, it's time for some Honda Civic DIY projects! Questions about problems with your car do NOT go here.
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We are getting VTEC. I confirmed it with the Honda Diagnostic code reader. The VTEC enagages, but the switch turns on and off sparatically according to my buddy who came along for the monitoring.
__________________ Constantly redefining the 7thgen Civic's performance... Dezod Motorsports.
would there really be a big benifit to lowering the vtec engaugment on boost?
Only benefit would be to help TQ or HP "fall-off" points when dyno tuning. If for example, there is a nice dump off on TQ @ 4200 RPMS, but your VTEC is set to engage @ 4900 RPMS....You can adjust the VTEC down to help "patch" that fall off on your numbers so your dyno curves are more smooth that spikey.
__________________ Constantly redefining the 7thgen Civic's performance... Dezod Motorsports.
I am about to go hook this thing up to do everything but VTEC. Hopfully we can find something that works. Dezod is attempting the same as we speak. Both of us should have a solution soon.
Final Verdict:
With what we see on the boards, and with what Greddy gives you, there is know way to properly control VTEC on 01-04 Civics. 4-8-E works, hooked up and all, but the VTEC is electronic only, meaning the VTM wire is still on the low cam.
The emanage thinks it's changing VTEC, and logs it, but VTEC wont kick in because the only jumpers that work are set to not use a VTM.
4-8-C is what I ended up going with. I have the exact same setup as Optoisolator whcih works EXTREMELY well. My car has rediculous top end, because I left all the VTEC wiring stock (nothing VTEC touches the emanage). The settings 4-8-C require you to set the jumpers inside to control VTEC, but you don't have to wire it. The only thing you have to do use check off the air flow adjustment map under your parameter settings and you'll be fine. Once again, opto started this and deserves credit for those findings. I added some fuel to my top end and it feels pretty nice. Doesn't bog down either so the safer the better.
Only other possibility: If you hook up 4-8-C and wire the VTEC system into it (purple, light blue, yellow) you have one thing to play with. If you go to parameter setting, on the top right you will see a pull down box allowing you to change your air flow metering. I tried the default which is 3. Once VTEC engages for the first time the engine goes into limp mode and wont rev past 4k (even with the deadband set correctly). I tried Air flow 1, and it through a CEL instantly, and went into limp mode before I even engaged VTEC once. I have an OBDII scanner, and it shows that I had an air flow meter error. The only thing I can think of is to manually change the air flow metering settings to each one and see what happens. One of those MAY do the trick.
Until then, I can now adjust my fuel and my VTEC works fine. I don't see the need to change it, right around 4200rpms my car pulls like a motha! I will soon be able to adjust ignition timing and crank up the boost a little more, once I get more familiar with the software. Until then, I'm happy. Hopfully you guys get this right the first try and save yourselves the aggrevation. Good luck and happy tuning!
