Injector scaling and latecy for different injectors.
OK...with the same latencies I scaled to 1170 and ended up with a Mid of -1.95 and a low of -2.5. Now I know this is where I want to be and could probably tweak the latencies a little to get it even closer, but doesnt this scaling seem rediculously high?!?!?
EvoM Guru
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Posts: 9,675
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From: Tri-Cities, WA // Portland, OR
Those are good values. I wouldn't touch the latency. Did you go one or two steps higher in injector scaling? If you went two steps, you could try backing off one step, but I suspect it will put you at ~3 for idle and cruise trims. Don't worry about the high scaling value. It just means that these injectors are quite a bit larger than the advertised value.
Those are good values. I wouldn't touch the latency. Did you go one or two steps higher in injector scaling? If you went two steps, you could try backing off one step, but I suspect it will put you at ~3 for idle and cruise trims. Don't worry about the high scaling value. It just means that these injectors are quite a bit larger than the advertised value.
Anyone else have an opinion? Should I scrap this scaling and start back over lower and mess with latencies and MAF scaling? I have been doing this for weeks now. I am half way tempted to just pay someone to get it nailed down for me. Any takers??
Last edited by SEEnoEVO; Apr 28, 2009 at 06:42 AM.
Oh yea and one other thing. The idle trim was obviously just that...a 20 minute idle trim average, but the cruise trim went from -1.7 to -2.3 and settled at -1.95 while doing a constant speed 20 minute cruise. Once I got off the expressway, the and did normal driving, the cruise trim shot to -9. Is this normal? I would guess the constant speed trim is most important but I was just wondering.
SEEnoEVO,
If you see 7's or 8's in your fuel maps for WOT with the current scaling, i would bring it down to the number that you feel comfortable with and where you see 9's or higher in the WOT fuel map. Then lower your latencies to bring mid trim closer to 0. Then use MAF scaling to bring low trim closer to zero.
You have an aftermarket intake on the car that is affecting MAF readouts, so i wouldn't recommend wasting weeks of your time hunting for perfect +/-1 trims. If they are within 5-7 or so and you have no driveability issues, leave them alone. That's what they are there for, to adjust your fuel, so that you dont have to rescale injectors for each different batch of fuel. Obviously it doesnt hurt to check that you don't have any boost/vac leaks.
If you see 7's or 8's in your fuel maps for WOT with the current scaling, i would bring it down to the number that you feel comfortable with and where you see 9's or higher in the WOT fuel map. Then lower your latencies to bring mid trim closer to 0. Then use MAF scaling to bring low trim closer to zero.
You have an aftermarket intake on the car that is affecting MAF readouts, so i wouldn't recommend wasting weeks of your time hunting for perfect +/-1 trims. If they are within 5-7 or so and you have no driveability issues, leave them alone. That's what they are there for, to adjust your fuel, so that you dont have to rescale injectors for each different batch of fuel. Obviously it doesnt hurt to check that you don't have any boost/vac leaks.
SEEnoEVO,
If you see 7's or 8's in your fuel maps for WOT with the current scaling, i would bring it down to the number that you feel comfortable with and where you see 9's or higher in the WOT fuel map. Then lower your latencies to bring mid trim closer to 0. Then use MAF scaling to bring low trim closer to zero.
You have an aftermarket intake on the car that is affecting MAF readouts, so i wouldn't recommend wasting weeks of your time hunting for perfect +/-1 trims. If they are within 5-7 or so and you have no driveability issues, leave them alone. That's what they are there for, to adjust your fuel, so that you dont have to rescale injectors for each different batch of fuel. Obviously it doesnt hurt to check that you don't have any boost/vac leaks.
If you see 7's or 8's in your fuel maps for WOT with the current scaling, i would bring it down to the number that you feel comfortable with and where you see 9's or higher in the WOT fuel map. Then lower your latencies to bring mid trim closer to 0. Then use MAF scaling to bring low trim closer to zero.
You have an aftermarket intake on the car that is affecting MAF readouts, so i wouldn't recommend wasting weeks of your time hunting for perfect +/-1 trims. If they are within 5-7 or so and you have no driveability issues, leave them alone. That's what they are there for, to adjust your fuel, so that you dont have to rescale injectors for each different batch of fuel. Obviously it doesnt hurt to check that you don't have any boost/vac leaks.
Since everyone has been so helpful, I did notice that at this scaling, when coming to a stop, my RPMs rise by about 400 before coming back down to normal about 3 seconds later. Any ideas on this?
Here is a set of three that should be good, all the owner/tuners report good results.
From fostyou:
Scaling=680
4.7V = 3.642
7.0V = 1.992
9.4V = 1.344
11.7V = 0.984
14.0V = 0.744
16.4V = 0.576
18.6V = 0.456
From joedr:
Scaling=713
4.7V = 3.504
7.0V = 2.184
9.4V = 1.224
11.7V = 0.960
14.0V = 0.792
16.4V = 0.552
18.6V = 0.432
From cpoevo:
Scaling=696
4.7V = 3.504
7.0V = 1.872
9.4V = 1.224
11.7V = 0.960
14.0V = 0.774
16.4V = 0.552
18.6V = 0.432
As you can see, not much variation.
If it was me, I'd use cpoevo's settings and see what happens.
From fostyou:
Scaling=680
4.7V = 3.642
7.0V = 1.992
9.4V = 1.344
11.7V = 0.984
14.0V = 0.744
16.4V = 0.576
18.6V = 0.456
From joedr:
Scaling=713
4.7V = 3.504
7.0V = 2.184
9.4V = 1.224
11.7V = 0.960
14.0V = 0.792
16.4V = 0.552
18.6V = 0.432
From cpoevo:
Scaling=696
4.7V = 3.504
7.0V = 1.872
9.4V = 1.224
11.7V = 0.960
14.0V = 0.774
16.4V = 0.552
18.6V = 0.432
As you can see, not much variation.
If it was me, I'd use cpoevo's settings and see what happens.
i just tryed the 713, with my 780 and it works great for now. what size injectors did he have??
I have noticed this too... I have FIC 750s and the 0011 rom and mine does the same thing... a good thing if you are VTA to avoid the stalling issue! However it doesn't do this with the 006 rom... weird...
Friend of mine is running stock, read: stock, injectors, and is throwing 0172's and trims are very negative.
Only thing I can guess is the ETS intake pipe(it idles at like 50-55hz...adjusting mid trim only of course). Would it be odd to scale the maf down, instead of up?
Only thing I can guess is the ETS intake pipe(it idles at like 50-55hz...adjusting mid trim only of course). Would it be odd to scale the maf down, instead of up?
Evolving Member
Joined: Jun 2005
Posts: 282
Likes: 5
From: Kuala Lumpur
Can we trust FIC latency data (eg: 850cc and 1050cc been told are same)? They sent me sheet of info and I think opening response is what we interested. Measurement given at 43.5psi (fuel pressure if I'm not mistaken).
Opening response (ms)
10v - 1.38
12v - 1.13
14v - 0.97
16v - 0.88
Closing response (ms)
10v - 0.99
12v - 1.00
14v - 1.01
16v - 1.02
As oppose with another injector lag time, they are completely different:
10v - 1.02
11v - 0.87
12v - 0.74
13v - 0.62
14v - 0.51
15v - 0.43
Opening response (ms)
10v - 1.38
12v - 1.13
14v - 0.97
16v - 0.88
Closing response (ms)
10v - 0.99
12v - 1.00
14v - 1.01
16v - 1.02
As oppose with another injector lag time, they are completely different:
10v - 1.02
11v - 0.87
12v - 0.74
13v - 0.62
14v - 0.51
15v - 0.43
