Re: How free should T03 impeller rotate?

Mark Wed, 27 Aug 2003 13:50:19 +0000

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


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Re: How free should T03 impeller rotate?

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