.060 restrictor installed, proper crankcase ventilation, weird idle...
09-20-07, 02:12 PM
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.060 restrictor installed, proper crankcase ventilation, weird idle...
I have installed a .060 restrictor in my turbo oil feed line and ventialted the crankcase properly. My smoking turbo problem is GONE, but I have a weird idle. I think it has to do with my AFR. I know that this may not be totally accurate, but I have an Apexi turbo timer w/ AFR reading. When I let my car warm up the AFR is anywhere from 12.0-14.6 and after letting it idle for longer it shows anywhere from 16.0-20.0 - This means too much fuel correct?
09-20-07, 02:15 PM
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at idle your reading will not be correct... the cars computer will try and compensate at idle causing your afr gauge (especially if it is a narrow band) to be innaccurate. depress the pedal for a moment and hold it there (5-10 seconds at 2k or so and read your afr
09-20-07, 09:24 PM
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It's not a closed-loop system at idle.
You're right about the narrow-band O2 sensor not being accurate though...
-Ted
09-22-07, 02:56 AM
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I know... I know... the narrow-band isn't the most accurate way to check my AFR, but I figured it would give me an idea.
Thanks YaNi, that makes more sense to me now... I have a BNR stage 4, cone filter intake, RB exhaust, Walbro, and RTek 1.8 with only 720cc primaries and secondaries. Would it make sense to get bigger injectors then?
Thanks YaNi, that makes more sense to me now... I have a BNR stage 4, cone filter intake, RB exhaust, Walbro, and RTek 1.8 with only 720cc primaries and secondaries. Would it make sense to get bigger injectors then?
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08-07-08, 09:28 AM
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at idle your reading will not be correct... the cars computer will try and compensate at idle causing your afr gauge (especially if it is a narrow band) to be innaccurate. depress the pedal for a moment and hold it there (5-10 seconds at 2k or so and read your afr
If the emissions system is in tact, air is being pumped into the exhaust manifold at idle causing an off-the scale lean condition.
Additionally, the stock O2 sensor cools down too much at idle and will not read correctly.
08-07-08, 01:02 PM
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That's incorrect. The only time the stock ECU runs under closed loop is light load cruise. At idle and everywhere else, it's open loop.
If the emissions system is in tact, air is being pumped into the exhaust manifold at idle causing an off-the scale lean condition.
Additionally, the stock O2 sensor cools down too much at idle and will not read correctly.
If the emissions system is in tact, air is being pumped into the exhaust manifold at idle causing an off-the scale lean condition.
Additionally, the stock O2 sensor cools down too much at idle and will not read correctly.
08-07-08, 09:01 PM
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Is this with or without the ACV and airpump working? Personally I've never seen/heard a RX that would idle at those figures, UNLESS the airpump was mixing air to the exhaust ports prior to the 02 sensor (like where else would that happen, duh).
Most all the idle figures I've seen were best at 13.0 afr,give or take a few percentage points, and nothing but skipping, crummy idle above say 14.0 afr. I've used two brands. Zeitronix and TechEdge controllers.
Right now I've a sixport turbo headed for the emissions testing and it's reading around 16.5 afr (idle)with all emissions working. Disconnect the Switching solenoids vacuum to the ACV and it drops down to the 13 afr area (no air to the exhaust ports if that's done).
08-08-08, 01:33 PM
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The diagram for both the TII and NA is in the Haynes and FSM. I've always just retained the purge valve nd connected them in a stock form.
However I'm going to simplify my car a bit as follows:
Bottom nipple from oil filler (on center iron) goes to catch can with little air filter on top. Top nipple Ts to the charcoal canister and then connects to a big nipple on the intake via a part store PCV valve.
08-08-08, 02:29 PM
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Is this with or without the ACV and airpump working? Personally I've never seen/heard a RX that would idle at those figures, UNLESS the airpump was mixing air to the exhaust ports prior to the 02 sensor (like where else would that happen, duh).
Most all the idle figures I've seen were best at 13.0 afr,give or take a few percentage points, and nothing but skipping, crummy idle above say 14.0 afr. I've used two brands. Zeitronix and TechEdge controllers.
Right now I've a sixport turbo headed for the emissions testing and it's reading around 16.5 afr (idle)with all emissions working. Disconnect the Switching solenoids vacuum to the ACV and it drops down to the 13 afr area (no air to the exhaust ports if that's done).
Most all the idle figures I've seen were best at 13.0 afr,give or take a few percentage points, and nothing but skipping, crummy idle above say 14.0 afr. I've used two brands. Zeitronix and TechEdge controllers.
Right now I've a sixport turbo headed for the emissions testing and it's reading around 16.5 afr (idle)with all emissions working. Disconnect the Switching solenoids vacuum to the ACV and it drops down to the 13 afr area (no air to the exhaust ports if that's done).
the cat like a slightly rich mixture, if you're a little lean emissions go up. if you lean it out and it misfires then emissions go WAY up.
interestingly the rx8 idles in the 14's and you can kinda tell
08-08-08, 04:02 PM
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I have installed a .060 restrictor in my turbo oil feed line and ventialted the crankcase properly. My smoking turbo problem is GONE, but I have a weird idle. I think it has to do with my AFR. I know that this may not be totally accurate, but I have an Apexi turbo timer w/ AFR reading. When I let my car warm up the AFR is anywhere from 12.0-14.6 and after letting it idle for longer it shows anywhere from 16.0-20.0 - This means too much fuel correct?
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