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RE: Im going CRAZY, WOT tuning is being a bastard! Running outoffuel
Mike,
This is exactly what I just did, just disabled closed loop. Havent tested it
yet. We'll see what happens, if it runs the same at wot all the time and as
good as that first time yesterday ill be as giddy as a school girl
Len,
any reason I should stay down so low on the factory TBI injectors? Ive
searched the archives and seen numerous posts stating that the factory GM
injectors can take alot more than that, something like 70 psi if memory
serves me.
Besides, if i ran these injectors at 13 psi i dont think they would support
beyond 200 hp.
Pablo
At 02:31 PM 5/25/00 -0400, you wrote:
>I was once at a site that had a lot of info on this subject.
>Also for me in my 165 now 730 tpi in an s15 ecm, had the same problem while
>going to the track.
>when the car was in limp mode from disconnecting the maf, it ran consistant
>but slower. When i transfered over to the 730, it too had the same problem.
>Bruce suggested i disable closed loop and run in open and tune it until it
>was bang on.
>when forced in open i ran consistant times that were as fast as my first
>times. thru tuning i eventually droped .5 sec of the et.
>now i'm working on closed loop but have not been to the track to test the
>latest bin.. will be tomorrow though.
>you should also mount a fuel pres guage that you can see while driving as
>close to the injectors as possible.
>
>my 5cents worth canadian (2 cents american :)
>> -----Original Message-----
>> From: olbap [SMTP:olbap@mail.mia.bellsouth.net]
>> Sent: Thursday, May 25, 2000 12:43 PM
>> To: gmecm@diy-efi.org
>> Subject: Re: Im going CRAZY, WOT tuning is being a bastard! Running
>> outoffuel
>>
>>
>> It runs strongest at about .9v, currently thats dropping down to very low
>> .8's and high .7s wot.. it runs absolutely horrible too, and im getting
>> pretty bad knock when it happens.
>>
>> The more I think about it the more im starting to think heat is causing
>> it.
>> Not coolant temperature but just some automotive component heat soaking.
>> The reason I believe this is because the last time I went to the track, it
>> did the same thing. I issumed it was bad injectors because the track is
>> 150
>> miles away. I figured the ecm would have learned pretty much all there was
>> to learn. I ran my fastest time on my first run, each run was
>> progressively
>> slower and slower and when i finally decided to look at my O2 it was down
>> at
>> .4 - .5 wot at the end of the night!
>> Yes, i have kept copies of each bin as i go and have taken mental notes.
>> As
>> I said before, i think my part throttle is very close to being right.
>>
>> Pablo
>>
>>
>>
>>
>>
>> At 08:08 AM 5/25/00 EDT, you wrote:
>> >Pablo,
>> >you didn't say what your O2 readings are. When chip tuning, always
>> >take notes, and keep copies of each bin as you go, so you can "go back".
>> >If you think the ECM's learning curve is fighting you, kill the power
>> >to the ECM and make another test run.. You didn't mention what you
>> >are using to gather data, but I would think the integrator numbers should
>> >help you tun the fuel...
>> >MV
>> >
>> >>
>> >> I start tuning WOT this morning, friend (or shall i say carbureted
>> arch
>> >> nemesis) comes by, first chip it runs very strong.. lean past 4200
>> but
>> >very
>> >> strong nonetheless, he thinks i might give him a run finally... he
>> leaves
>> >> afterwards.
>> >>
>> >> So, I go into my AFR- WOT table.. drop it down some at 4800
>> >>
>> >> Go for a spin again.. runs much better.. still lean a bit on top
>> >>
>> >> Repeat step two
>> >>
>> >> Go for spin again, seems like maybe (this is a shot inthe dark)
>> perhaps my
>> >> part throttle isnt as good as i thought, on therich side, and the ecm
>> is
>> >> leaning me out across the board
>> >>
>> >> Ok, ill just keep richening it up till its beyond the scope of
>> adjustment i
>> >> figure (yeah im real half assed about things, i just want it to be
>> fast at
>> >> wot at this point)
>> >>
>> >> Repeat step two.. several times
>> >>
>> >> repeat thepart about me going lean several times.. yet getting worse
>> >> andworse each time... down to about 3800 rpms its pretty much done.
>> >>
>> >> Ok, time to go crazy, so i start making big changes in the AFR and FL2
>> just
>> >> to make it bird killing, rear bumper blackening, plug fouling rich
>> (id
>> >> rather work down than up)
>> >>
>> >> ok, it only makes itBARELY better than what it was
>> >>
>> >> at this point, i think a geo metro can beat me
>> >>
>> >>
>> >> desperate times call for desperate measures so i repeat the bird
>> killing,
>> >> plug fouling step
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>x?>"?
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