quick maft pro question

[lian]

ok so i finished my head gasket rebuild and the car now has 550s in it .
so the car runs holds around 11 and 12 under throttle but hold 9.8 to 10.3 on idle and revs up and down.
so the main quest is what on maftpro did you guys have to adjust after putting 550 injectors.

 

[Fletch124]

Just about everything.

 

[lian]

well its not bad when your under throttle but i just need some pointers on how i can fix the idle so it does not stall out

 

[lian]

ok so i found outtoday that the erson helping pluged back in the maft sensor so i unpluged it.now i get a 10.0 at criuse and idle rich then when i put the gas on harder around 1 2 psi i get 16 17.does anyone have a data sheet before and after they installed 550 injectors.

 

[thedave925]

You need to be more clear on what the numbers represent. Punctuation really helps too.

in post 4 you say maft sensor like its part of the maft-pro, but the circumstance you use the phrase 'maft' in in this instance sounds like your talking about the AFM.

Lets do some math. The ECU uses 440 injectors. What percentage larger is the 550s?

Since the new injectors flow that much more, you need to scale the injection rate of the ECU that much less.
Take that percentage and apply it to the maft-pro main settings for fuel adjustment.

No two maft-pro installs are the same therefore one person's data sheet is not ideal for another's install.

 

[lian]

ok thanks for replying dave.
could you help me tune if i log my info on this page.
and sorry the stock afm was plugged in by my helper when put the engine back together, but now it is unpluged.
last year it had a proffesional tune.
and my main scale is at -20 the same as when the 440's were in.
thanks for the help.

sorry for the bad grammer

 

[thedave925]

Sorry bud, tuning is going to have to be done by you or some tech on the spot with the car.

Glad you unplugged the afm
-20 is about right for your situation.

Given that the only change in the headgasket job is the larger injectors, and retaining the professional tune you had, there shouldn't need to be any additional changes really.
Going -20 on main scale should be the only thing to do unless you opened up the flow for intake or exhaust. Anything else PTT can handle, and AFR tracking should keep you safe in boost.

 

[lian]

hey thanks for the info the only flow i changed is the turbo elbow i rid of the stocker.
I also think i have an exaust leak inbetween the elbow and my wide band sensore i assume this can screww up my readings.
also i need some links to tuning maftpro for dummies.
thanks dave
ps -20 mainscale is what the pro tuned it too

 

[thedave925]

upgrading that elbow to a high flow is like adding 15hp across the board.
its up to you to watch your AFRs that you don't go lean, too much into the 12s is bad. Should be high 11s.
Any exhaust leak before the WB02 sensor is a compromise in the accuracy of the sensor's readings, and the overall reliability of your engine declines as a result of too much heat being the killer of components.

fullthrottletech.com is a great place to research on the maft-pro.
here at supramania, we have a lot of info buried in a few threads, but there is a lot to sort out.

Sounds like your golden if your mainscale is at -20
Good luck with the research
-Dave

 

[lian]

ok thank im gona recalibrate my sensor and i found another gasket that will seal the new elbo better then that old ring seal.
ill let you know tommorow how it goes

 

[lian]

ok so i fixed the leak and it still runs really rich at idle.
what can be adjusted to lean up the idle abit?

 

[thedave925]

Check for codes. Do what ever it takes to make that ecu happy, which means do what it takes to have a voltage reading around 2.5 on the Aux1 monitor setting of the maft-pro.

Do you have an adjustable fuel pressure regulator? first take care of the codes...

 

[lian]

well i have no codes and yes i have a fuel regulator just not installed yet,dave from driftmotion said the stock regulator should handle the 550's but i got one just incase.

 

[lian]

here are some numbers off the maft pro unit I had to write it down becouse i am relearning how to use tuner rt again i will put the rest of the numbers on when im done writing the rest.
Config select:
Vehicle select mode 0
Number of cylinders 6
Displacement 3.00 litre
Air fuel mode speed density
Map source GM 3 bar
Load source use map
Baro mode read @ key on
F out mode supra MK 3
V out 1 mode MAP 3 bar GM
System setup;
Spark base 0.0
Use ve table #1
Fe smooth 30
AF trdelay 0.0
Tm correct 1.27
Tm base 0.0
F out max 0
Hi load pt 143.0
Mi load pt 100.1
Lo load pt 36.4
Afterstart 1.8
V out 2 set 4.720
V out set 3.900
Main scale – 20.0
Afr tracking:
Min tps 3.000
Min rpm 3008
Min load 166.4
Lean lim% 5.0
Rich lim% 20.0
Gain 5.6
Afr 2000r 12.5
Afr 3000r 12.2
Afr 4000r 11.6
Afr 5000r 11.5
Afr6000r 11.5
Afr7000r 11.5
Afr 8000r 11.5
Aux% 0.0
Air temp:
212f + 3.o%
173f +2.0%
129f 0.0%
103f 0.0%
82f 0.0%
62f 0.0%
41f +1.0%
13f +1.5%
-40f +3.0%
Aux trig:
@7600 0.0%
@7000 0.0%
@6400 0.0%
@5800 0.0%
@5200 0.0%
@4600 0.0%
@4000 0.0%
@3400 0.0%
@2800 0.0%
@2200 0.0%
@1600 0.0%
@1200 0.0%
@800 0.0%
@400 0.0%
Tune high load:
@7600 +10.0%
@7000 +10.0%
@6400 +10.0%
@5800 +15.0%
@5200 +17.0%
@4600 + 15.0 %
@4000 +19.5 %
@3400 +21.0%
@2800 +17.5%
@2200 +15.0%
@1600 + 8.0%
@1200 0.0%
@800 0.0%
@4000.0%
Tune mind load
@7600 +20.0%
@7000 +20.0%
@6400 +20.0%
@5800+ 20.0%
@5200 +20.0%
@4600 +25.0%
@4600 +20.0%
@3400 0.0%
@2800 0.0%
@2200 0.0%
@16oo +6.5%
@1200 +6.5%
@800 +6.5%
@400 +5.0%

Tune low load
@7600 0.0%
@7000 0.0%
@6400 0.0%
@5800 0.0%
@5200 0.0%
@4600 0.0%
@4000 0.0%
@3400 0.0%
@2800 0.0%
@2200 -1.5%
@1600 +2.0 %
@1200 0.0%
@800 +6.0%
@400 +12.0%

 

[lian]

Tune response:
Maf/krpm 0.0%
Maf limit: 0.0%
Maflim tps 0.000
Map rpmmin 1536
Map tpsmin 1.000
Bst enrich .15
Map enrich 0.60
Pts mapmax 0.0
Tb size 7
Tps decay 0.80
Tps enrich 0.66
Pt traking:
Gain 13.1
Lean a/f 14.8
Lean delay 10.0
Lean load 13.0
Cruise a/f 14.4
Cruis load 91.0
Cruise rpm 2560
Crusie tps 0.0900
Idle a/f 14.5
Idle rpm 864
Idle tps 0.480
i will get some tuner pro rt info once i can get tuner pro to detect my maftpro forgot how

 

[thedave925]

Some of your settings are questionable.
Why would your main scale be -20, only to recover most of that in Mid and Hi Load?

check out this link, its a manual so you know what the settings are for:
http://www.fadingworld.com/Supra/MAFT/Manual%204.80.php

This is where a lot of info can be had if you have any minute questions
http://www.supramania.com/forums/showthread.php?t=40255&highlight=maft+manual

Are you still running stock fuel everything, just with larger injectors?

 

[lian]

hey dave thats some great info.
yes im running stock fuel system with big injectors I have walbro ready to be installed ,I am trying to just get the car running decent so ican burn off some fuel before i change the pump i have a full tank.
alot of the links you gave me are dead if you have anymore it would be much apreciated

 

[thedave925]

http://www.fullthrottletech.com/showthread.php?p=16015#post16015

that has a lot of what the settings are for.
Sorry about the 4.80 manual, apparently it got taken down. i have a copy of it in .html format. i can email it to you if you want. Pm me your addy.

**EDIT, I found where the manual went, you can download it here:
http://www.turboninjas.com/supra/maft/?d=1%20- Manuals (MAFT, Wideband, etc)&s=&r=

 

[sneakypete]

i would zero out your mid and high load adjustments and the mainscale. install the fuel pressure regulator and walboro, and then fix the exhaust leak.
reset the ecu and start from scratch

start the car and get it to operating temp
start by adjusting the fuel pressure to get you vf readings (aux1 on the maftpro) as close to 2.5 as you can
once you do that, start messing with the pulling fuel from the mainscale. im running 550's on my car and only am pulling -9 from the mainscale
your afr at idle should be around 14.7

as far as the mid and high load adjustments, you have to take logs of runs and make adjustments from there. most people are pulling fuel in the mid and high loads, not adding

just remember to make adjustments slowly, then go back and take another log and readjust

 

[lian]

thanks great info guys my email is krunklian@hotmail.com.
also are there any instructions links on installing the fuel regulator.
and could my mid and high effect my idle .
thanks again ill keep you guys posted