Racetronix Delphi/Lucas 37# Injectors, IFR & Offset
10-20-2005, 09:32 AM
#1
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Racetronix Delphi/Lucas 37# Injectors, IFR & Offset Got a set of used ones should come on the FedEx truck
today. I've seen a bunch of questions about tuning
these in but not much in the way of "finished product",
seems like maybe nobody ever got to a believed-correct
offset table (I can probably get the flow table right, with
a little research into flow rating pressures and on-car
fuel pressure measurement).
But if anyone's gone down this road and gotten to an
offset table they believe in, I'd rather scrounge than
work.
today. I've seen a bunch of questions about tuning
these in but not much in the way of "finished product",
seems like maybe nobody ever got to a believed-correct
offset table (I can probably get the flow table right, with
a little research into flow rating pressures and on-car
fuel pressure measurement).
But if anyone's gone down this road and gotten to an
offset table they believe in, I'd rather scrounge than
work.
10-20-2005, 09:39 AM
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I believe Racetronix only bundles and optionally
flow-tests the pieces. Now, a varied-pulse-width
(esp. at low) rack of flow data I could work with.
But I don't believe flow matching tests look at
the low end, just the big end.
Maybe I'll have to get my tester out of storage
and rework the driver electronics and do it like
science. But I figure it's easier just to fix the
flow table and then diddle the offset until the
idle fuel trims end up back where they started.
Not as easy as found data though.
flow-tests the pieces. Now, a varied-pulse-width
(esp. at low) rack of flow data I could work with.
But I don't believe flow matching tests look at
the low end, just the big end.
Maybe I'll have to get my tester out of storage
and rework the driver electronics and do it like
science. But I figure it's easier just to fix the
flow table and then diddle the offset until the
idle fuel trims end up back where they started.
Not as easy as found data though.
10-20-2005, 09:41 AM
#4
I'm running Racetronix 37lb injectors along with their plug and play fuel system. Geoff at Thunder Racing calculated the offsets and they seem to be perfect. What table do you need help with?
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10-20-2005, 09:57 AM
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Originally Posted by Patrick G
I'm running Racetronix 37lb injectors along with their plug and play fuel system. Geoff at Thunder Racing calculated the offsets and they seem to be perfect. What table do you need help with?
that I think is the tricky (not just arithmetic from the
ratings) one. But if you've got a hosted .bin that has
these injectors modeled up nice I would just pull that
down and snarf all of the injector related tables from it.
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10-20-2005, 05:24 PM
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Thanks, Patrick. I got the file.
Then I got the box, and what were represented to be
the 37#ers, have Delphi numbers that correspond to
the 32# ones
We'll see what the answer is on that one. Hopefully
the seller has the 37# and just sent me the wrong
ones. Though I could probably get by with 32s (being
36.5# @ 58PSI) I was really looking for a swap-'em-
once, bigger-than-I'll-ever-need type of deal.
So anyway, I was on Racetronix' site looking at the
flow data for static and pulsed operation hoping to
line that up, try and extrapolate to an injector offset
to check it against Patrick's tables. What I found
confuses me. When I do the arithmetic on the pulse
delivery (25% duty cycle) converting g/pulse at
pulse rate to g/min or lb/hr, the numbers say the 25%
pulse is delivering way more than the plain, always
open injector. Has anyone looked at these numbers
and come up with a more sensible (like, I would expect
1/4 the mass flow) result out of it?
Here're the numbers for the 32# from the site:
Static Flow Rate @ 58.0PSI (400kPa) = 36.5 lb/hr = 384cc/min = 276g/m
Dynamic Flow Rate @ 58.0PSI (400kPa) = 7.72 gm/pulse - 2.5ms pulse width and 10ms repetition rate
Now, I make it 7.72gm/pulse*100pulse/sec*60sec/min=46320gm/min.
That makes the units right side up but the number is
insane. I'm off by a factor of 167 (which is suspiciously
close to 1/6*1000, but why?). The same sort of thing
happens when I try to line up the 37#ers' data. Ideas?
What I want to do, is take the 10mS/10mS and the
2.5mS/10mS numbers, extrapolate to zero flow axis
and see what relation that time value bears, to the
injector offsets people have come up with. But I have
to untangle the spaghetti first.
Then I got the box, and what were represented to be
the 37#ers, have Delphi numbers that correspond to
the 32# ones
We'll see what the answer is on that one. Hopefully
the seller has the 37# and just sent me the wrong
ones. Though I could probably get by with 32s (being
36.5# @ 58PSI) I was really looking for a swap-'em-
once, bigger-than-I'll-ever-need type of deal.
So anyway, I was on Racetronix' site looking at the
flow data for static and pulsed operation hoping to
line that up, try and extrapolate to an injector offset
to check it against Patrick's tables. What I found
confuses me. When I do the arithmetic on the pulse
delivery (25% duty cycle) converting g/pulse at
pulse rate to g/min or lb/hr, the numbers say the 25%
pulse is delivering way more than the plain, always
open injector. Has anyone looked at these numbers
and come up with a more sensible (like, I would expect
1/4 the mass flow) result out of it?
Here're the numbers for the 32# from the site:
Static Flow Rate @ 58.0PSI (400kPa) = 36.5 lb/hr = 384cc/min = 276g/m
Dynamic Flow Rate @ 58.0PSI (400kPa) = 7.72 gm/pulse - 2.5ms pulse width and 10ms repetition rate
Now, I make it 7.72gm/pulse*100pulse/sec*60sec/min=46320gm/min.
That makes the units right side up but the number is
insane. I'm off by a factor of 167 (which is suspiciously
close to 1/6*1000, but why?). The same sort of thing
happens when I try to line up the 37#ers' data. Ideas?
What I want to do, is take the 10mS/10mS and the
2.5mS/10mS numbers, extrapolate to zero flow axis
and see what relation that time value bears, to the
injector offsets people have come up with. But I have
to untangle the spaghetti first.
10-28-2005, 05:49 AM
#9
TECH Resident
Found a page to help calculate the flow rates. Hope this helps.
https://ls1tech.com/forums/showthrea...or+table+excel
In the first post under injector tuning, looks like there is some nice Excel tables. I'll be using these when I put in the Racetronix 42#.
https://ls1tech.com/forums/showthrea...or+table+excel
In the first post under injector tuning, looks like there is some nice Excel tables. I'll be using these when I put in the Racetronix 42#.
10-28-2005, 11:41 AM
#10
The easiest way i've found to do offsets for injectors that are pretty far off from the factory offset table (most SVO's work real good with the factory offset) is to set the IFR table so that the LTFT's are equally off over the whole range (within reason). Then just edit the offset table to make the ltft's come into the proper range and ajust the O2 switch points if neccessary.
Seems to work pretty good for me in the few cars i've done that way.
Seems to work pretty good for me in the few cars i've done that way.
