Im going CRAZY, WOT tuning is being a bastard! Runningoutoffu el

[Mike Rolica]

does it have a knock sensor??  it could be pulling out alot of timing too..
though i'm not familiar with tbi....
i'm TPIguy not TBIguy <grin>

Mike Rolica
Plant A
Meridian Magnesium Products
Strathroy
(519)-245-4040 Ext. 265

> -----Original Message-----
> From:	olbap [SMTP:olbap at mail.mia.bellsouth.net]
> Sent:	Thursday, May 25, 2000 3:15 PM
> To:	gmecm at diy-efi.org
> Subject:	RE: Im going CRAZY, WOT tuning is being a bastard!
> Runningoutoffuel
> 
> 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 at mail.mia.bellsouth.net]
> >> Sent:	Thursday, May 25, 2000 12:43 PM
> >> To:	gmecm at 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
> >>
> >-------------------------------------------------------------------------
> >> ---
> >> >To unsubscribe from gmecm, send "unsubscribe gmecm" (without the
> quotes)
> >> >in the body of a message (not the subject) to
> majordomo at lists.diy-efi.org
> >> >
> >> >
> >> >
> >> 
> >>
> --------------------------------------------------------------------------
> >> --
> >> To unsubscribe from gmecm, send "unsubscribe gmecm" (without the
> quotes)
> >> in the body of a message (not the subject) to
> majordomo at lists.diy-efi.org
> >Content-Type: application/ms-tnef
> 
> >
> >xY>"

> 
> --------------------------------------------------------------------------
> --
> To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
> in the body of a message (not the subject) to majordomo at lists.diy-efi.org
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/ms-tnef
Size: 5524 bytes
Desc: not available
URL: <http://lists.diy-efi.org/pipermail/gmecm/attachments/20000525/1ebb80dc/attachment.bin>