Tacoma - OVTUNE - VFTUNER - Update Info and Original Development

I am now at 100 miles. Everything about this tune on my truck seems better than 1.01b aside from the 1000 to 2000 rpm range where stuttering still resides and does seem a bit worse after learning, from stock. I don't think I had enough time with 1.01b to say if it's different from that version.

Let me know what I can do to help log and resolve it @OVTune

 

CPS? I just ordered one. Should be here tomorrow.

 

Remember, I have the new 98 sensor. It won't help

 

I lose track of y'all!

 

Too much beer on his birthday

 

this kind of report seriously makes me hope to see a MT on the dyno soon. why there is variance (even if somewhat subjective) among the MT's brings up some questions.

@Toytaco2k17 do you have the TRD CAI and/or catback? wonder if this is one piece behind the difference. or possibly this is just purely subjective and your performance is the same as mine.

 

I have a Magnaflow catback and a cold air intake.

 

Problem found. If that MAF reading is off even a little bit due to the design of the intake, it's going to throw off the tune.

 

I asked @OVTune a few pages back if the truck he used on the dyno was stock. I could have sworn I read that the truck used had an intake and exhaust, so the tune should be fine if you have those mods. However Since im stock I'm worried the tune may run to lean for me since I won't have the supporting mods. Yes I've seen plenty others in this thread running stock with the tune. However I have not seen any AFR readings on either so this is just a guessing game for me at the moment.

I'd really like to confirm some of this before I pull the trigger on purchasing this.

 

The truck had a TRD intake and TRD catback.
As long as you use an intake that is well designed AND has the correct MAF metering diameter (intake tube inner diameter MUST match stock) then it should be perfectly fine. AVOID intakes that are larger diameter. They may "claim" to make more power but it is only by leaning it out and throwing off the measurements completely. Usually they do it just enough so that it is only off 10-15% and not enough to trigger a CEL.

My personal recommendation is to use the stock intake or TRD designed part. It's possible to use other intakes but as said above it can throw things off.

Something important to understand that I think the general public is un-aware of is that on cars that uses MAF based load systems (damn near everything now) it is critically important that the MAF readings are as close as possible to the calibrations expected tables.
The information the MAF sensor sends to the ECU controls how the ECU calculates engine load and fueling, which ultimately affects EVERYTHING.

When the diameter of the pipe is too small, air is "increased" by false measurements. The ECU then calculates load and fuel way higher than it should be, and has to continually trim it away with LFT and SFT. But load is always off so you lose power by running less ignition, more fuel, etc.

The exact opposite happens when the diameter of the pipe is too large. The MAF sensor does not register the correct volume of air, and thinks the engine is breathing less. It then calculates less fuel, less load. You ultimately run leaner and run with less engine load which means higher ignition timing at full throttle (because the ECU thinks you're only at 0.5 load when you should be at 0.85) and you get detonation and other bad things happen.

 

It had a TRD intake, which is using the same stock location/size MAF housing. Tuning on that intake design which is near factory is not going to have an impact on the MAF's ability to read accurately like a completely different design like a K&N intake (which at least one of their DID throw a CEL for the for running LEAN, and they had to go back and redesign it, which was probably just putting it under that threshold)

 

ok, glad to confirm the test mule had the intake/exhaust.

are you still working on something you mentioned before, a way's back? something small and hardware-related?

 

The tested truck had one. I have the stock intake, the TRD, and a K&N Series 71. I am currently running the TRD because I accidently stripped the MAF bold hole on the K&N when I changed it out for the stutters I was experiencing on 1.01A. I could not find the correct helicoil at the time to fix it. 1.01B fixed the stutter I and a few other guys were having so I ordered the TRD when I went to put it back on.

 

I don't think you're understanding the fundamental difference between a stock designed MAF Housing TRD Intake versus the K&N that I believe you have. Two totally different intakes, with totally different designs, and likely variation in your MAF reading vs. the TRD's.

Edit: seeing your latest edit, thanks for clarifying. Moot point if you're using the TRD, the intake wouldn't be an issue.

 

See my edited post. I fully understand. I don't see why people are giving me a hard time for sharing my experience with 1.02. but what ever. In my experience with my truck, it does not have the same power. I have not said anything bad about it. When we data log these trucks with what ever Matt eventually provides us with, it will be fixed I'm sure. I am decently familiar with tuned engines. I have had a tuned Cummins, a supercharged Mustang, and a 2JZ swapped Mark I Supra. It will get fixed. Matt is great. I have a friend with a tuned Mazda using his stuff. Certain people on here seem to want to try to disprove that my truck does not feel as powerful. Come to Tn, I will let you drive it.

 

I wasn't trying to give you a hard time; if it came off that way I apologize. I had recalled in the past you had the K&N and was assuming that's the intake you were running which may have explained some variation.

 

Thank you for taking the time to explain everything. I know you're busy but would you be able to give me an idea of what the air/fuel levels were looking like on the dyno.

I've owned many forced induction vehicles over the past decade including turbo diesel trucks.
ECU tuning is something I don't shy away from, but I take it very serious.

I appreciate your contribution to the 3rd gen Tacoma community. I plan to make the purchase of your tune once the windows laptop(been running mac) I ordered comes in.

 

OVTune@, Mat, thanks for your straight forward explanations on how everything works. I'm an old school-get-ur-HP from mechanical improvements. Are you still planning on a 87 tune? I'll buy & drive out of my way for the 91 till its done if it's in the works. I understand what you told me about additives, no sure thing there. Thanks

 

It's cool. Your a good guy on here. The truck does seem to be waking up some. It's still better than stock. I have a couple of buddy's that want to buy it based off my truck. They are amazed at how it rolls with the tune and my heavy tires.

 

Hi all, I have a couple of notes to share WRT 1.02...

First, I still maintain that this tune is an excellent product and the customer service is exemplary (thanks Mat!). I can't imagine driving the truck one more km with that horrid OEM code!

Here we go:

1. After a learning period of approx 200-300km, some throttle delay mushiness has crept it's way back in. I've noticed several times that I've had to hammer the gas pretty hard to get the revs up for a quick 3-2 downshift rev-match. Not all the time though, it may actually depend on how fast I'm going. Of note, if you give the truck more than one shot of throttle in a row (stopped, clutch in), the first response will be quick, but all that follow will be muted. It's still 10X better than stock, however;

2. The power delivery seems to have changed in some circumstances. Yesterday I downshifted from 6th to 4th on my way home to get around some traffic, and when I got on it (not quite WOT) the truck just kinda didn't respond for a few seconds. Again, it doesn't always happen, and otherwise the cruising power in 5th/6th is very good.

Notes:

- I do not run any "power adders" such as intake/exhaust - bone stock engine.

- I have not run any earlier versions of the tune.

- Temps have been quite consistent over the last several days where I live, 22-24 degC.

- I replaced my CKP/ cleaned my MAF before flashing with 1.02

I'm looking forward to M/T dyno day with much anticipation!

Frank