Mark, I may be wrong but here I go any hows :O) Cause on a carby engine throttle is vacume/throttle linkage controlled, as soon as you decel, the fuel automatically slows a little, then the vacume slows a little so there is no decell fitted.
On a injected motor, fuel is not sucked out the the injectors they pulse at desired speeds at certain rpm's and the fuel is under pressure , decel automatically knows when you relese the pedal and stops/ slows the injectors pulse speed stopping the engine from being really rich ect ect. So when you disconect the decell, the injectors will still be on lets say full load, till the o2 censor picks up the fuel is rich, and tells the computer to slow them down. Idiling after stopping at the lights, will be for a sec a little rich, then the o2 censor and puter will fix it and go to the desired, tuned pulse speeds for idle RPM's. This is my comprehention of EFI, I may be really wrong, but hea I have never owned a efi car, or worked on EFI. I am ready to be blasted down, if I am wrong, but hea isn't this how we all learn?? Later. Rick White. ----- Original Message ----- From: "Mark" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, August 27, 2003 9:31 PM Subject: Re: How free should T03 impeller rotate? > Specifically for the Haltech application the parameters are when 0% > throttle AND the below set RPM (1,500 in my fuel map) - just wondering > what is happening when I disable this function i.e. will it running-on > or run rich when under 1,500 @ 0% throttle when decel cutout function > disabled or just idle rich. > > On Wednesday, August 27, 2003, at 11:10 PM, mark krawczuk wrote: > > > hi, decel cuts fuel of when you , er , um decelerate cause you dont > > need > > fuel then. > > mark k > > ----- Original Message ----- > > From: "ryanmel" <[EMAIL PROTECTED]> > > To: <[EMAIL PROTECTED]> > > Sent: Wednesday, August 27, 2003 7:52 PM > > Subject: Re: How free should T03 impeller rotate? > > > > > >> i think decel cut off is mainly for fuel efficiency, may be wrong, but > >> pretty sure > >> > >> ----- Original Message ----- > >> From: "Mark" <[EMAIL PROTECTED]> > >> To: <[EMAIL PROTECTED]> > >> Sent: Wednesday, August 27, 2003 5:29 PM > >> Subject: Re: How free should T03 impeller rotate? > >> > >> > >>> Justin was right on the money - the TPS was playing up, reading 0% > >>> when it shouldn't (I didn't print or save the last datalog otherwise > >>> I > >>> might have noticed this earlier - but it was obvious when reading the > >>> engine data tonight after work on the trusty Toshiba). > >>> > >>> I disabled decel cutoff and recalibrated the TPS and woohoo! around > >>> the > >>> block I go and what a relief - I had contemplated $$$ check & rebuild > >>> on the turbo such was my paranoia. Now I wonder what the implications > >>> are of not running with decel cutoff on my motor - pretty well stock > >>> FJ20 Turbo with 2.5" exahust. > >>> > >>> Previously when it self-corrected it lead me to look at the turbo - > >>> when in fact it simply must have been repeated rotation of the TPS > >>> which flicked back into life. So now gotta add the laptop to my > >>> emergency tool box anytime I venture more than a few hours walk from > >>> home ;-( > >>> > >>> > >>> > >>> On Wednesday, August 27, 2003, at 04:21 PM, Robert Charles Scealy > >>> wrote: > >>> > >>>> Just testing a theory, on your old log does it only go to 32 when > >>>> you > >>>> are above 1700 rpm? Does it only go to 8 when you are off the > > throttle? > >>>> And when you are on the throttle at all but under 1700rpm does it go > > to > >>>> 0? And are all the occurances of the code 40 happen when you are > >>>> both > >>>> off the throttle and engine revs are about 1700rpm? > >>>> > >>>> On Wed, 27 Aug 2003 [EMAIL PROTECTED] wrote: > >>>> > >>>>> Here's the quote from a Tuner on the Haltech forum, I'm still > >>>>> awaiting a reply > >>>>> from Haltech support. > >>>>> > >>>>> ============================== > >>>>> Hi Mark, > >>>>> The engine flags reading in the software is really quite difficult > >>>>> to > >>>>> dechipher > >>>>> unless you really know what your looking at and even then they are > >>>>> of > >>>>> limited > >>>>> use. This is really a Haltech in-house debug tool .. wont really > >>>>> help > >>>>> you. > >>>>> > >>>>> It sound like you have the decel cutoff feature catching you out. > >>>>> > >>>>> Step 1. Make sure your TPS is connected and correctly calibrated... > >>>>> Best to recalibrate it to be sure ... very easy ... go to Menu and > >>>>> select > >>>>> calibrate throttle and do what it tells you to do. > >>>>> > >>>>> Step 2. > >>>>> Go to the Fuel setup page and see if "decel cutoff" in enabled or > >>>>> disabled. > >>>>> > >>>>> My bet is that decel cutoff is enabled at 1700 rpm and that is what > >>>>> is going > >>>>> on .... Decel cutoff will cut fuel at the set RPM when ever the > >>>>> engine is above > >>>>> the setpoint and at zero tps. > >>>>> > >>>>> It will cut back in if you come back below set RPM or if throttle > >>>>> exceeds 1% > >>>>> > >>>>> Best thing to is to turn it off ... do your tuning ... and then > >>>>> re-activate it > >>>>> if you want to use it .. some engines are better off without it > >>>>> (ported > >>>>> rotaries for example) > >>>>> > >>>>> I hope that helps > >>>>> > >>>>> Regards > >>>>> Justin K > >>>>> Tweakit Performance > >>>>> Sydney Australia > >>>>> ========================== > >>>>> > >>>>> > >>>>> Quoting Robert Charles Scealy <[EMAIL PROTECTED]>: > >>>>> > >>>>>> I find it interesting that they say it is a debug flag, and that > >>>>>> 32 > >>>>>> + 8 > >>>>>> = 40. It sounds to me like value 32 and value 8 are not supposed > >>>>>> to > >>>>>> occur together. Do you have the exact wording of what the Haltech > >>>>>> board > >>>>>> said about these flags? > >>>>>> > >>>>>> The only time I have ever spun turbos I would say I have been able > > to > >>>>>> flick them hard enough to maybe a couple of revolutions. > >>>>>> > >>>>>> On Wed, 27 Aug 2003 [EMAIL PROTECTED] wrote: > >>>>>> > >>>>>>> Trying to diagnose my FJ20ET F9 ECU that cuts out at ~1700 rpm - > >>>>>>> I > >>>>>> thought > >>>>>>> maybe turbo was not healthy and removed the filter and intake > >>>>>>> piping - I > >>>>>> can > >>>>>>> rotate the compressor impeller quite easily - I don't expect that > > it > >> > >>>>>> should > >>>>>>> just spin almost without friction or should it? > >>>>>>> > >>>>>>> I ran a datalog on a laptop and the printout shows that at the > >>>>>>> precise time > >>>>>> of > >>>>>>> cutout (or surging if I maintain a steady throttle at around > >>>>>>> 1,700 > >>>>>>> rpm) > >>>>>>> the "engine flag" value changes from 8 to 40 and inj m/sec goes > >>>>>>> to > >>>>>>> 0.000. > >>>>>>> > >>>>>>> Advice from the Haltech board is the flags are an "in house debug > >>>>>>> tool" > >>>>>> and > >>>>>>> hard to decipher. > >>>>>>> > >>>>>>> Examining an older log when engine ran fine I do see an > >>>>>>> occasional > >>>>>>> value of > >>>>>> 40 > >>>>>>> with inj m/sec 0.0000, but only rarely. Mostly it reads 0, 8, or > > 32. > >>>>>>> > >>>>>>> Also suggested was to disable decel cut-off and recalibrate the > >>>>>>> TPS > >>>>>>> both > >>>>>> which > >>>>>>> I'll try tonight after work. > >>>>>>> > >>>>>>> Mark.JT > >>>>>>> > >>>>>> > >>>>>> > >>>>>> > >>>>> > >>>>> > >>>>> > >>>> > >>>> > >>>> > >>> > >> > >> > > > > > > > > --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/[EMAIL PROTECTED]/ ---------------------------------------------------------------------
