Ready for some fun? Tell me if a MAFT can solve this!
06-30-2002, 01:09 AM
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Ready for some fun? Tell me if a MAFT can solve this! Alright, just ATAPed the car today. 25% Ltrims at part throttle. Willa MAFT take care of it? Also I had 4 degrees of false knock because of my exhaust.. damn cheap y-pipe. Also, I forget what my O2s were but I was told it was rich at WOT. But the main question is will a MAFT help the 25% Ltrims? Also, will running no O2simms in the back do anything performance wise? TIA
Jason
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06-30-2002, 01:52 PM
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Re: Ready for some fun? Tell me if a MAFT can solve this! There are a lot more knowledgable people here, but since you don't have any responses yet maybe I can clear up one thing. Ltrim readings at anything but WOT are worthless. Find out what your LTFTs are at WOT, and then use a MAFT to bring them as close to 0 as possible. From my experience, you could have your LTFTs set perfectly, and yet have high readings at partial throttle. Only WOT readings are relevent.
06-30-2002, 01:57 PM
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Re: Ready for some fun? Tell me if a MAFT can solve this! Then why is there at part throttle adjustment on the MAFT if it doesn't matter? Just curious, I have very little knowledge of all this electronics mumbojumbo.
Jason
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06-30-2002, 03:57 PM
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Re: Ready for some fun? Tell me if a MAFT can solve this! Jason, I never heard of a "part throttle adjustment" on a MAFT. Mine doesn't have one, just two adjustment pots (base & WOT) in 5% and 2% increments. Is this to bring the LTFTs to zero at part throttle??? I'm a little confused.
06-30-2002, 04:03 PM
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Re: Ready for some fun? Tell me if a MAFT can solve this! Oops, sorry, thats my fault, I confused base for part throttle. The person who ran the ATAP test told me that the ltrims should be right around 0%. He told me 25% was really, really lean at part throttle. At WOT I am rich, though I forget by how much. This is just what I have been told, thats why I'm looking for more helpwish more people would jump in here and help out....
Jason
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06-30-2002, 05:48 PM
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Re: Ready for some fun? Tell me if a MAFT can solve this! Jason, it sounds like you'll have to richen your base setting and lean your WOT setting. The same situation I had. My settings are +15 Base and -6 WOT. Use your a-tap and try to get your Ltrims near zero at WOT, and don't worry about partial throttle contrary to what that guy said. In fact, when you get your Base setting near zero at WOT the partial throttle won't be so high. Then use your O2 readings, again at WOT, and try to get the voltage around .890 to .910. This will get you in the ballpark. For the most accurate tuning, you need a wide band at the dyno shop. Good luck, I hope I helped some.
06-30-2002, 05:51 PM
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Re: Ready for some fun? Tell me if a MAFT can solve this! You helped quite a bit, thank you. Now only if the guy in the classifieds selling a MAFT would respond.... hmmmm....
Jason
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06-30-2002, 06:32 PM
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Re: Ready for some fun? Tell me if a MAFT can solve this! dial the BASE settings to 15%(rich), let the car run for 50 miles or so, atap it...your Ltrim should be close to 0, if not then try 20%(rich).
Then dial the WOT settings at -4%(lean) and atap your O2 readings, if it's still too rich, then dial -6% or -8% till you get the O2 down to .890~900
as for your question:
But the main question is will a MAFT help the 25% Ltrims? Also, will running no O2simms in the back do anything performance wise? TIA
yes, and no
Then dial the WOT settings at -4%(lean) and atap your O2 readings, if it's still too rich, then dial -6% or -8% till you get the O2 down to .890~900
as for your question:
But the main question is will a MAFT help the 25% Ltrims? Also, will running no O2simms in the back do anything performance wise? TIA
yes, and no
06-30-2002, 06:39 PM
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Re: Ready for some fun? Tell me if a MAFT can solve this! Thanks for the help catfish, I like to see hard number estimates.... I'll try that as soon as a MAFT gets here.
Jason
Jason
06-30-2002, 11:43 PM
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Re: Ready for some fun? Tell me if a MAFT can solve this! Don't bother with the WOT adjustment unless you have a wideband - especially if your LT's are in the upper positive teens or higher. The O2's don't always correlate directly to a specific A/F ratio.
My O2's read .93-.94, and my LT's were ~+16%. I had to run 10-12% lean to achieve .88 averages. When I wideband'ed my AF's were in the upper 14's at WOT. <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" /> Reverted the WOT to +0, and AFR's were 13:1 across the board.
So far as base, there seems to be two schools of thought:
1) Slightly positive gives you better timing at WOT
2) Slightly negative prevents additional fuel being added and thus easier to tune.
*shrug* I chose #2.
"No O2simms"? The rear O2's are only used to confirm emmissions compliance (i.e., cat's being used). No direct gain by capping them, replacing them with sim's, or having them programmed out.
My O2's read .93-.94, and my LT's were ~+16%. I had to run 10-12% lean to achieve .88 averages. When I wideband'ed my AF's were in the upper 14's at WOT. <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" /> Reverted the WOT to +0, and AFR's were 13:1 across the board.
So far as base, there seems to be two schools of thought:
1) Slightly positive gives you better timing at WOT
2) Slightly negative prevents additional fuel being added and thus easier to tune.
*shrug* I chose #2.
"No O2simms"? The rear O2's are only used to confirm emmissions compliance (i.e., cat's being used). No direct gain by capping them, replacing them with sim's, or having them programmed out.
07-02-2002, 01:01 AM
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Re: Ready for some fun? Tell me if a MAFT can solve this! I got the MAFT on it tonight and got a few better results (auto-tapping
ofcourse) @ +%20 on the bottom side and %-6 on the bottom I am seeing a tad bit (1%) of knock between 3k-3,500 but loose all knock above that, at which point my LTERMS go to %0.0 and my 02's are around 890... I'm feeling pretty good about this bandaid (until I get real tuning) but any input that my point otherwise would be appreciated.
ofcourse) @ +%20 on the bottom side and %-6 on the bottom I am seeing a tad bit (1%) of knock between 3k-3,500 but loose all knock above that, at which point my LTERMS go to %0.0 and my 02's are around 890... I'm feeling pretty good about this bandaid (until I get real tuning) but any input that my point otherwise would be appreciated.
