Upgraded to a Z06 85mm MAF do I need to change anything other than the MAF Table?
I am basically Stock.. I used HP tuners to update the MAF table of my 2000 with the 2002 table..
I fired it up today while still on Jackstands.. I let it idle till full warmup then I logged it on Tuners. I noticed that the LTFT trims were running about Positive 9-10... WTF? that makes no sense.. Even my old tune before the MAF had the Injectors bumped up a slight bit to keep my trims negative 5-6...
Why would this bigger MAF swing the LTFTs so much?
I Reset the Trims using the realtime options while idling.. The STFT's were in the negatives a bit.. but the LTFT's were still like 10+
I realize the LTFT are calculated over a longer time.. and I probably need to drive it. Should I ignore this until I get her on the road and drive it a bit?
By the way.. idle and blipping the throttle to almost WOT seems to respond fine..
Why would you "bump up your injectors" to fix a trim issue. If you have HP tuners, just tune it right. The MAF table needs to rescaled to your vehicle. Setup hp tuners to be MAF only, get a wideband and tune it.
Why would you "bump up your injectors" to fix a trim issue. If you have HP tuners, just tune it right. The MAF table needs to rescaled to your vehicle. Setup hp tuners to be MAF only, get a wideband and tune it.
The MAF was already Rescaled using the Factory 2002 Z06 MAF Table..with my HPtuners
As far as the Trim using the Injectors..
I originally tuned the car with LS1Edit.. I bumped a 1 or 2% across the board on the injector rate. this creates a rich condition thus forcing the PCM to PULL fuel and create a (Negative Trim)
Its common practice to have Negative Fuel trims before tuning WOT. Allegedly..if you are adding fuel (Positive Trims) it makes WOT tuning more difficult..Because it would potentially add it to the PE.. In a negative Trim nothing can be pulled or added to PE..
Again, By forcing the injectors a bit richer.. the System Pulls Fuel.. and creates a Negative.. The Optimal was about -3 to -5...
If you're tuning fuel trims, it takes anywhere from 50 to 100 miles for your PCM to learn your new tune. You want your short term trims to be 0 or as close to it as you can. You should never mess with the injector flow rate but should reset the maf table to fine tune your trims. There are all kinds of examples on the HPT website.
You should also upgrade the VE table to the 02 Z06 table too.That will work better with the MAF.There is no problem moving the injector table and you don't need a wideband.
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2011 Camaro SS ,synergy green -shop car
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Old car-2002 Electron blue C5
Z06 catback,Edit tuned.
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2005 Avalanche,SOM,Corsa,tuned ,Single turbo kit 450hp/475tq at 7lbs of boost.
1999 Trans Am -420ci C5R motor -daily driver -10.2 at 130mph NA
Put your injector values back to stock. Now tune your VE table as your should have from the beggining in SD mode.
Chill Dude... I realize it was not tuning..
I simply want to get the car running solidly before I start my tuning process..
If you were tuning in the early 2000's and ever used LS1edit or a MAF Translator... You'd know There were OTHER methods that worked fine..
When I had LS1edit I SELF "STREET" tuned my car using the injector Rate and the PE Tables to get the following Dyno Sheet
We were going to do a Wide Band tune but after that pull the tuner said leave it.. it looked good..
You should also upgrade the VE table to the 02 Z06 table too.That will work better with the MAF.There is no problem moving the injector table and you don't need a wideband.
That sounds like a good idea to get me started... I also have an LS6 Intake Manifold so it should look just like a Zo6 from an airflow standpoint
With the exception of the injectors and heads and Cam..
But the VE table should be ok to copy? Gonna put the injectors back to stock..
Corvette Store
Upgraded to a Z06 85mm MAF do I need to change anything other than the MAF Table?
I realize it was not tuning..
