dlatch
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| posted on 12/7/10 at 08:49 PM |
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gsxr injectors required fuel settings
what settings have fellow gsxr TB users come up with for the higher flow 270cc version?
using the data of 2000 cc engine 4cyc and the 270c i get this
 
Description
does this sound look about right ? trying to get the basics ready before the wideband arrives and i can start tuning 
Also what fuel pressure should i run? i have it set to 3 bar atm which is the usual i think.
cheers
duncan
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flak monkey
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| posted on 12/7/10 at 09:04 PM |
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3 bar and 12 is about right
Sera
http://www.motosera.com
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omega 24 v6
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| posted on 12/7/10 at 10:39 PM |
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Close enough to start with
mines came out at 14
and is now rescaled to 11.something IIRC
If it looks wrong it probably is wrong.
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DaveFJ
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| posted on 13/7/10 at 09:44 AM |
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I'm running 13.0
only other difference I have is Battery voltage correction is set at .20 but i dont know if that is right....
Dave
"In Support of Help the Heroes" - Always
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fatbaldbloke
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| posted on 13/7/10 at 10:47 AM |
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Well, I'm going out on a limb...I reckon it's too large and you'll get low resolution in your VE table. I'd be looking at
something much nearer 7.
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omega 24 v6
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| posted on 13/7/10 at 11:35 AM |
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Fatbald bloke does have a point IMHO
There is a part of the manual that states that your ve at idle should be around the 30ish point. the only way to do this is to lower your reqd fuel in
my experience.
My idle ve is currently 19 ( from memory)
but the car seems to be running OK just now so I'll work on other parts of the map first.
ETA you can have table values above 150 but I think you draw the line around 230
( again from memory)
as the pulse width and duty cyle are maxing out at this point.
[Edited on 13/7/10 by omega 24 v6]
If it looks wrong it probably is wrong.
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dlatch
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| posted on 13/7/10 at 05:56 PM |
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thanks for the replies so far guys
FB
i am starting with your map which actually runs pretty good on mine as it stands, once i sorted the tps scale, the only difference we have regarding
spec is the injectors flow so what happens on mine is what i suspect to be rich running when running your map due i expect to the lower flow rate of
your injectors.
here is your Reg fuel un modded
 
Description
my LC-1 arrived today so once i have sorted another leak on the sump and get the wideband fitted i will have a better idea of whats really happening.
Is the calc for required fuel in TS not optimal for throttle body setup?
do you think i should alter the reg fuel first then fine tune the VE table from there? i want to use this as a learning process as it really interests
me but i can play with building maps from scratch later once i have more experience.
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fatbaldbloke
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| posted on 13/7/10 at 09:30 PM |
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Ah, forgot you had my map.... So, in answer to your question, knowing that map has been developed with a lot of time on a rolling road and runs
perfectly, I'd be tempted to get an idle at around 1050-1100 rpm solely by using the req fuel value and not mess with shape of the the VE table.
(PS, don't worry about the AFR at idle, just adjust the req fuel so it idles smoothly.)
Now, following on from that I have a theory that for some reason the req fuel calculator gives double the correct value for this particular set up, so
going out even further on a limb, I reckon if you went for 6.2 (i.e. half the calculated 12.4) it would take into account the higher fuel rates of
your injectors.
[Edited on 13/7/10 by fatbaldbloke]
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dlatch
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| posted on 13/7/10 at 09:40 PM |
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FB
hmm thats kinda of what i was thinking will give that a try first off see what happens.
is there any info on how the required fuel calc works? would be interesting to know i have been googling with no luck on the subject
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fatbaldbloke
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| posted on 13/7/10 at 09:51 PM |
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I've actually no idea how it works, but I've worked with several MS set-ups where halving the calculated value has put things on the right
route. It may be something as simple as the algorithm failing to take into account the squirts per cycle or the alternating staging.
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dlatch
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| posted on 13/7/10 at 09:55 PM |
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just found the info is actually in the mega manual 
Req_Fuel is calculated from the equation:
REQ_FUEL*10 = 36,000,000 * CID * AIRDEN(100kPA, 70ºF)/(NCYL*AFR*INJFLOW ) * 1/DIVIDE_PULSE
http://www.megamanual.com/v22manual/mfuel.htm
[Edited on 13/7/10 by dlatch]
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dlatch
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| posted on 15/7/10 at 08:54 PM |
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innovate LC-1 fitted (very easy job)
need to calibrate and test tomorrow evening it was getting to late to be reving engines ect
was looking through settings with laptop connected to the LC-1 and on the advanced tab where you can alter updating speed, what is everyone using?
also on this screen.
 
do i need to uncheck this otherwise my MS will think its talking to a narrow band sensor? if so what do i set the volts to?
cheers
duncan
[Edited on 15/7/10 by dlatch]
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dlatch
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| posted on 16/7/10 at 07:21 PM |
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played a bit more tonight and have the LC-1 running correctly, had a slight stall with megatune due to the project properties being for narrow band
but once that was sorted it worked great.
and my suspected over fueling on FB's map is actually under fueling lol this is why i bought the wideband so i have upped the required fuel to
9.0 which is giving me a afr of 12 at a nice steady idle of 1000 rpm can get the afr to about 14.7 but it runs lumpy and it feels much happier with
the richer idle this feels right and i think others using itb are around the same ?
further playing tomorrow can't wait
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fatbaldbloke
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| posted on 16/7/10 at 09:16 PM |
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Good news, well done. Yep, idle at around 12 is quite normal.
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omega 24 v6
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| posted on 16/7/10 at 09:59 PM |
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quote:
and my suspected over fueling on FB's map is actually under fueling lol this is why i bought the wideband so i have upped the required fuel to
9.0 which is giving me a afr of 12 at a nice steady idle of 1000 rpm can get the afr to about 14.7 but it runs lumpy and it feels much happier with
the richer idle this feels right and i think others using itb are around the same ?
Very much so.
I now have my idle at 13.2 as you say any higher and it runs rough and when the engine bay is hot and in traffic it leans out big time and stalls.
If it looks wrong it probably is wrong.
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dlatch
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| posted on 16/7/10 at 11:29 PM |
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yeah i could lean it out to run at 13+
but i think as you mentioned under bonnet temps will affect it so i will leave it on the rich side it was actually 12.5 to be precise.
will do some data logs tomorrow and a gentle run see what it does, it seems to rev up ok with little hesitation.
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fatbaldbloke
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| posted on 17/7/10 at 08:27 AM |
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Keep an eye on the AE light if you can see the ECU, or failing that check it in the datalog. If you have any signal spikes, especially if
you're using a MAP signal to activate the AE, it's quite common for the signal oscillations to continually activate the AE, which will
give you a very rich mixture. Best bet is to set the AE trigger as high as it will go so it's right out of the equation, get the steady state
running right, and then bring a little AE in. With itb's you should need very little AE anyway as there isn't much manifold surface layer
to worry about.
My map is set up to use MAP as the AE trigger, but that's because I have a low noise to signal ratio at the levels I'm looking to trigger
the AE, however I'd suggest for setting up that switching to TPS trigger would be much less problematical. You can play with MAP triggers later
if you have an afternoon to waste!
[Edited on 17/7/10 by fatbaldbloke]
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