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Re: Im going CRAZY, WOT tuning is being a bastard! Running out offuel
Len,
Im running 50 psi. They should be flowing about 90lbs/hr now (at stock
pressure they flow 40lbs) The example I gave of my track experience was at
15 psi.
Pablo
At 01:53 PM 5/25/00 -0400, you wrote:
>At 01:43 AM 5/25/00 -0400, you wrote:
>>Something is definately not right here
>>
>>Heres the breakdown of my day
>>
>>
>>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
>>a teeensy itty bitty bit better if at all
>>at thispoint imdown to an AFR of 2 at4800 rpm
>>i started outat like 11 andit ran much better yet asthe day progressed it
>>seemed to just get leaner andleaner. Im starting to correlate it with heat..
>>it seemed the harder and more i ran the car the leaner it got.
>>Ok, the pump is new, rated at 40 psi, and42 gph
>>The injectors are stock 305 TBI injectors, externally regulated to 50 psi
>>the motor is a 309.9 ci SBC, 214/224 .474.498, ported andpolished #416
>>heads, edelbrock torker II single plane manifold.. blah blah blah
>>as a very conservative guesstimate, 300hp
>>thats definately not happening at this point
>>im thinking its 1 of three things
>>My injectors just cant take it, im running them at too great of a duty cycle
>>and they dont like me
>>My fuel pump doesnt like 50 psi as much as i thought it would though id
>>figure ifanything, pressure would drop, and thatslack could be taken up by
>>just making the top end crazy rich in the chip to where itwouldnt run lean
>>at say.. 30 psi(i know thats not the right way of doing things but im just
>>trying to eliminate the pump as the culprate here)
>>or, im really really rich at part throttle (im not) and the puter is
>>learning to lean everything down, sorta like the return road problem the GN
>>guys have
>>I could have tested the last one I suppose but instead i just got angry at
>>thecar and kept throwing more fuel at it hoping it would go away. It didnt.
>>Any ideas guys?
>>at this point the darkside (carburetion) is looking very tempting.. tell me
>>some good news
>>thanks
>>
>>Pablo
>> Question, How much Fuel Pressure are you Using @ stock GM TBI
>> Injectors ?
>
> Len
>
>>----------------------------------------------------------------------------
>>To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
>>in the body of a message (not the subject) to majordomo@lists.diy-efi.org
><html>
>At 01:43 AM 5/25/00 -0400, you wrote:<br>
><blockquote type=cite cite>Something is definately not right here<br>
><br>
>Heres the breakdown of my day<br>
><br>
><br>
>I start tuning WOT this morning, friend (or shall i say carbureted
>arch<br>
>nemesis) comes by, first chip it runs very strong.. lean past 4200
>but very<br>
>strong nonetheless, he thinks i might give him a run
>finally... he leaves<br>
>afterwards.<br>
>So, I go into my AFR- WOT table.. drop it down some at 4800
><br>
>Go for a spin again.. runs much better.. still lean a bit on top<br>
>Repeat step two<br>
>Go for spin again, seems like maybe (this is a shot inthe dark)
>perhaps my<br>
>part throttle isnt as good as i thought, on therich side, and the ecm
>is<br>
>leaning me out across the board<br>
>Ok, ill just keep richening it up till its beyond the scope of adjustment
>i<br>
>figure (yeah im real half assed about things, i just want it to be fast
>at<br>
>wot at this point)<br>
>Repeat step two.. several times<br>
>repeat thepart about me going lean several times.. yet getting
>worse<br>
>andworse each time... down to about 3800 rpms its pretty much done.<br>
>Ok, time to go crazy, so i start making big changes in the AFR and FL2
>just<br>
>to make it bird killing, rear bumper blackening, plug fouling rich
>(id<br>
>rather work down than up)<br>
>ok, it only makes itBARELY better than what it was<br>
>at this point, i think a geo metro can beat me<br>
>desperate times call for desperate measures so i repeat the bird
>killing,<br>
>plug fouling step<br>
>a teeensy itty bitty bit better if at all<br>
>at thispoint imdown to an AFR of 2 at4800 rpm<br>
>i started outat like 11 andit ran much better yet asthe day progressed
>it<br>
>seemed to just get leaner andleaner. Im starting to correlate it with
>heat..<br>
>it seemed the harder and more i ran the car the leaner it got.<br>
><b>Ok, the pump is new, rated at 40 psi, and42 gph</b><br>
>The <b>injectors are stock 305 TBI injectors, externally regulated to 50
>psi</b><br>
>the motor is a 309.9 ci SBC, 214/224 .474.498, ported andpolished
>#416<br>
>heads, edelbrock torker II single plane manifold.. blah blah blah <br>
>as a very conservative guesstimate, 300hp<br>
>thats definately not happening at this point <br>
>im thinking its 1 of three things<br>
>My injectors just cant take it, im running them at too great of a duty
>cycle<br>
>and they dont like me<br>
>My fuel pump doesnt like 50 psi as much as i thought it would though
>id<br>
>figure ifanything, pressure would drop, and thatslack could be taken up
>by<br>
>just making the top end crazy rich in the chip to where itwouldnt run
>lean<br>
>at say.. 30 psi(i know thats not the right way of doing things but
>im just<br>
>trying to eliminate the pump as the culprate
>here) &nbs
p;
><br>
>or, im really really rich at part throttle (im not) and the puter
>is<br>
>learning to lean everything down, sorta like the return road problem the
>GN<br>
>guys have<br>
>I could have tested the last one I suppose but instead i just got angry
>at<br>
>thecar and kept throwing more fuel at it hoping it would go away. It
>didnt.<br>
>Any ideas guys? <br>
>at this point the darkside (carburetion) is looking very tempting.. tell
>me<br>
>some good news<br>
>thanks<br>
><br>
>Pablo<br>
> Question, How much Fuel Pressure are you
>Using @ stock GM TBI Injectors ?</blockquote> <br>
> Len<br>
><br>
><blockquote type=cite
cite>-----------------------------------------------------------------------
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>To unsubscribe from gmecm, send "unsubscribe gmecm" (without
>the quotes)<br>
>in the body of a message (not the subject) to
>majordomo@lists.diy-efi.org</blockquote></html>
>
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