Big Injector (2150cc) & 6l90 Tuning
03-02-2014, 04:46 PM
#1
Big Injector (2150cc) & 6l90 Tuning Ok we know if your MAF is incorrectly scaled the TCM receives an erroneous torque value and makes incorrect shift adjustments. Why it is so critical to have a spot on engine tune with the 6L80/90.
With the above stated getting the 2150cc injectors scaled correctly the MAF has been divided x2 (50%) so they are low thus causing issues with the trans now. Few people I talked said to mess with the PE table but that's wot what about cruising. Even with messing with the PE tables I don't think we will get the MAF back in line but maybe 20%.
Not sure on options but few ideas floating around in the air now.
1. Relocate the MAF sensor to the intercooler tank.
2. Go to a lower cc injector (ID1300) and mess a little with the PE table to get things in line.
Thoughts? 1076rwhp on e85 (low boost) thus far but I want moar but I want a shifting trans too lol.
With the above stated getting the 2150cc injectors scaled correctly the MAF has been divided x2 (50%) so they are low thus causing issues with the trans now. Few people I talked said to mess with the PE table but that's wot what about cruising. Even with messing with the PE tables I don't think we will get the MAF back in line but maybe 20%.
Not sure on options but few ideas floating around in the air now.
1. Relocate the MAF sensor to the intercooler tank.
2. Go to a lower cc injector (ID1300) and mess a little with the PE table to get things in line.
Thoughts? 1076rwhp on e85 (low boost) thus far but I want moar but I want a shifting trans too lol.
Last edited by 1INSANEGTO; 03-02-2014 at 04:52 PM.
03-02-2014, 05:38 PM
#2
Why have you not gone with a 2/3 bar OS and not worry about the maf?
There are so many tables to address with that setup if one is off, just like you said, itll all come down.
There are so many tables to address with that setup if one is off, just like you said, itll all come down.
03-02-2014, 10:39 PM
#4
This is a 100% street car so if its not needed to do what I want to do then I will but I want to exhaust all options.
Last edited by 1INSANEGTO; 03-02-2014 at 11:23 PM.
03-03-2014, 12:08 AM
#5
When you apply the 2 bar op system it wont matter anymore on that part. That should be the first option when running that much boost IMO.
You will likely need a few things after you do that.
2 bar or 3 bar map
Tuning
more tuning
WOT tuning
Then you should be ok.
You will likely need a few things after you do that.
2 bar or 3 bar map
Tuning
more tuning
WOT tuning
Then you should be ok.
03-03-2014, 12:44 AM
#7
Well then you already have that covered.
You did not clarify and in the era of swaps, it is hard to tell.
Rather than going in and hacking every fuel table etc, that 2/3 bar OS will work and work well for a street driven car of that power range. Sometimes the MAF will give fueling problems as you can get into higher HZ readings at nearly any speed and it can cause a spike or a hesitation in the fueling.
The VE map is alot better as it is based off of pressure.
You did not clarify and in the era of swaps, it is hard to tell.
Rather than going in and hacking every fuel table etc, that 2/3 bar OS will work and work well for a street driven car of that power range. Sometimes the MAF will give fueling problems as you can get into higher HZ readings at nearly any speed and it can cause a spike or a hesitation in the fueling.
The VE map is alot better as it is based off of pressure.
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03-03-2014, 11:43 AM
#10
It's a large injector scaling issue and not related to the MAF not being able to read that much airflow as you would have to deal with the same issues in SD. I've seen MAF setups run to 1200 rwhp without issue on the newer operating systems that support that kind of high frequency operation but that's not the problem he is having anyways...
A custom 2.5 bar SD OS doesn't get rid of the injector flow rate limitation on Gen 2 Vs. I'd personally run 1300cc injectors and not scale for ECM/TCM torque reasons with the 6L90. Then again at that power level I wouldn't be bothering with the 6L90s anyways and just do a 4L80.
A custom 2.5 bar SD OS doesn't get rid of the injector flow rate limitation on Gen 2 Vs. I'd personally run 1300cc injectors and not scale for ECM/TCM torque reasons with the 6L90. Then again at that power level I wouldn't be bothering with the 6L90s anyways and just do a 4L80.
03-03-2014, 12:22 PM
#11
If the maf is rescaled of course it wont have a problem.
There may be other alternatives that are not talked about yet but without knowing the full build it is hard to say.
There may be other alternatives that are not talked about yet but without knowing the full build it is hard to say.
03-03-2014, 12:57 PM
#12
My point had to do with MAF vs SD, the MAF is scaled for the large injectors and SD would also have to be scaled so going SD wouldn't solve anything related to reported torque for the TCM, etc. You can only scale up the airmass/EQ ratio so far on the engine side to compensate and scaling every load table in the TCM that's shown in the various editors only works so well.
03-07-2014, 01:09 PM
#16
You can bring your reported torque values back in line by modifying the TORQUE coeficents. Usually the one that is RPM vs map based works the best. That will make the transmission work correctly again.
You can watch actual vs commanded torque values on the pids.
You can watch actual vs commanded torque values on the pids.
