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#21 | |
![]() Join Date: Jul 2005
Location: Atlanta, GA
Posts: 81
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High HC is usually a symptom of incomplete combustion. It's possible the spark is advanced too far or your plugs are fouled. What kind of test does VA perform? Is it a two-speed, dual load or just an idle test?
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![]() 1991 Chevrolet Corvette ZR-1 |
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#22 | |
Join Date: Aug 2005
Location: Fishers, IN
Posts: 811
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![]() Seriously, though, I'm not sure I have many good ideas in this case Especially from afar. you might have to bring somebody in to tune it in person. Is the VA test dynamic ie., on the rollers or just idle? There are various tricks always mentioned, but I've never tried any of them (fortunately my state doesn't require testing). Dom is right, if it's been done, you'll find it on ThirdGen.Org DIY-PROM board. I just don't have any answers off the top of my head. Good luck. Todd |
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#23 | |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,697
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Do you have a scan of the motor when its doing this? RK, As for your issue, my "suspicion" is the cam overlap. Particularly at low rpm. I am going to stress the word SUSPICION. I don't want to do a Bill Frist on your Z from hundreds of miles away. ![]() Again, is your problem primarily at lower rpm and idle? I'm guessing it probably is if its on one of those IM240 EPA Test dyno cycles. Last edited by XfireZ51; 01-10-2008 at 09:44 PM. |
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#24 |
![]() Join Date: Jan 2004
Location: Alex VA
Posts: 1,087
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yes it's the IM240, they test at 15 and 25 mph
with the cam overlap it's going to be pretty tough at these standards I need someone who can tune on the emissions machine which has proved hard to do. I know the car is currently running rich, and hopefully leaning it out will help but I doubt I can get it down that low. thanks for the advice
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95 390 LPE ZR1 (505 rwhp) LSV = Lingenfelter Super Vette Twin Turbo 2003 Z06 (800 RWHP) |
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#25 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,697
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rk,
Any idea what the O2 is reading at idle? Does it show lean? What about the BLMs? |
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#26 | |
![]() Join Date: Jul 2005
Location: Atlanta, GA
Posts: 81
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![]() 1991 Chevrolet Corvette ZR-1 |
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#27 | |
Join Date: Aug 2005
Location: Fishers, IN
Posts: 811
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Code:
ORG $86D8 ************************************************************ ** F6EEC TABLE ** BASE PROPORTIONAL STEP SIZE VS. CLFLOW ** ** TABLE VALUE = COUNTS ************************************************************ F6EECC FCB 9 9 'CTS' 0 AIRFLOW FCB 24 24 16 FCB 24 24 32 FCB 24 24 48 FCB 24 24 64 ; ************************************************************ ** F9EEC TABLE ** PROPORTIONAL STEP GAIN VS. O2 ERROR COUNTS ** ** TABLE VALUE = MULTIPLIER * 256 ************************************************************ F9EECC FCB 64 0.251 'MULT' 0 O2 ERROR FCB 64 0.251 8 FCB 64 0.251 16 FCB 64 0.251 24 FCB 70 0.2745 32 FCB 72 0.2824 40 FCB 88 0.3451 48 FCB 96 0.3765 56 FCB 104 0.4078 64 FCB 112 0.4392 72 FCB 120 0.4706 80 FCB 120 0.4706 88 |
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#28 | |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,697
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For RK's issue, I'm wondering if we couldn't modify the O2 swing points because of his bigger cams, particularly at low airflow. Would you confirm for me that the addresses for these items in $D0A mask are the same or not? Last edited by XfireZ51; 01-12-2008 at 12:49 AM. |
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#29 | |
![]() Join Date: Dec 2003
Location: Chicagoland,IL
Posts: 2,679
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Ron, we had the same test here in Illinois what we would do on big cams install an air pump and pump fresh air in the exhaust lots of it and alchy. Heck connect 2 leaf blowers if you have to ![]() What i use to do with my Z i had Show Car insurance 2500 miles a year or less which was legal in IL got waiver from Emmisions. Now Illinois is done testing OBD1 cars. Pete
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'91 #1635 PoloGreen 350 LT5 11.09 @ 129.27 11.04 @ 128.86 474RWHP 400RWTQ http://www.youtube.com/watch?v=SFNFOhGGlR4 http://www.youtube.com/watch?v=ZlRIOMwaDYY https://sites.google.com/site/peteszr1garage Last edited by Pete; 01-12-2008 at 02:41 AM. |
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#30 | |
![]() Join Date: May 2005
Location: Nichols, FL
Posts: 615
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Before tearing the calibration apart get a WB, log the O2s vs other perameters and post the log. That is the way we do it on the Megasquirt forum and it has proven to be the best way to get informative help. If I read the earlier part of this post its present in both stock and moded cal. That tells me its something else. From what i read I can't tell if its a too rich or lean. Yes the calibration can be changed to allow O2 info to be reported in the ALDL stream and its simular to what was reported on the other forum. Ron I am pretty sure you could get an emissions only calibration tha would pass. PM me later in the week for some thoughts, I am at the NCRS meet this weekend and am rather busy trying to make it happen Tyler
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55 Polo White (Project) 61 Jewel Blue (Sold to buy above) 66 Nassau Blue 68 Torch Red 88 ZR1 Blue 90 ZR1 White |
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