Incredibly unlikely. Even if the processor is running at 20MHz (this is on the slow side, I'm sure its clock is more like 100MHz?), That's 50ns per clock cycle. And let's assume for fun that it only triggers on up or down edges, not both, that's 100ns per instruction. This is absolute worst case scenario. No way.

Technosquare doesn't tweak VVEL, right? I'm assuming VVEL is still not really "cracked"?

I don't know if they cracked VVEL but I am very happy with their ECU.

try the techno reflash Iced?!

I haven't, but I would love to! Definitely don't have the $ for that =(

it has been cracked. the VVEL. Its in the works in the testing phase

There has to be some reason why the car starts losing throttle response after driving it for awhile. If it's a lag in the actuator system, then it would lag from the start. As for DBW, I never had issues with the VQ35DE power delivery. It was fun giving people whiplash when I tap the throttle, but that eagerness isn't there in the 370Z. It was eager to rev and felt like it had a light flywheel when I test drove it. :dunno:

For owners staying N/A, I'd like to see what the results of ECU tweaks would bring especially after driving for long periods. I'm planning to force feed this motor next year, so hopefully the ECU tweak will also improve low end response.

After I got the exhaust installed, I definitely felt the low end responsiveness was not as quick as stock. After technosquare ECU re-flash, the low end responsiveness is back and the car is pulling harder. Also I have not experienced any lost of responsiveness for an extended period of driving. Also before oil cooler installed, my Z temperature was at 240 during a normal driving and it went up around 260+ for a spirited driving. Again, I didn’t see any change in responsiveness.

The yellow Z in the Technosquare video is KillerBee370's. His Z was a mule for the 09 370Z ECU tuning. He had the first hand experience during the development. He did experience gas pedal delay and went back to technosquare for a minor adjustment. Tadashi of Technosquare did his magic. I’ve heard that technosquare will not offer ECU re-flash on the 2010+.

There are many people on here with UpRev. Maybe they want to chime in if they have experienced with gas pedal delay.

The one reason that I heard is that once the car is modified in a way which affects sensors (MAF, o2), these parameters the sensors are reading is off from the stock inputs which causes the ECU to interpret and then adjust which may take slightly longer for the ECU to respond to input such as the throttle. I felt the throttle response was a bit faster and more punchy after my tune but I never had anything near what some of you guys are getting in terms of lag and diminishing power.

Granted, there is a problem with stock Zs as well so this isn't a meaningful explanation.

IIRC, IcedZ is bone stock. Mine only has the pulleys and exhaust, but I already noticed the response issues prior to installing the mods. The pulleys improved it, but it did not resolve the low end power loss.

What I wonder is the difference in throttle response with the VQ35DE and the VQ37. The DE definitely has a stronger punch and a bit more aggressive tip in.

For those wondering about dyno charts, how can one graph the power band under 3k RPM? How can we get a visual of the power being cut or held back? It would be nice to get a visual on the 2.5k RPM stall or the clunky feeling (tech describes as fuel cut) as the tach revs to redline with 50-80% throttle in 3rd or 4th.

You recall correctly. The only thing "extra" I've done is put in K&N filters. I did that a while ago. I was thinking about that earlier this week while cleaning them. Maybe something as simple as that is the problem?? I was thinking about going to wal-mart or the like and picking up some Fram instead or something closer to stock. Worth a try.

Your filters needed cleaning already?

I have K&N as well, but I can't remember if this happened before I installed them. I wasn't that familiar with the car then.

Mine only seems to lag during turns - does it happen at stoplights going straight as well?

This happens to me on rare occasions. Once it even did it to me in 2nd, 3rd and 4th. Every time it happened it was between 3500 to 4000 rpms. It was always after a stop too. To try and stop it from occurring I let it rev higher before shifting. It hasn't happened after I've been doing that. It's irritating because I really don't know what causes it. At least I'm not alone on it lol!

Yea, it's true you definitely need to rev beyond 3k RPM. It's hard to execute, but I tried to rev over 3k a couple of times before engaging 1st. Either that or let it rev past 3k in 1st before going into 2nd. This engine definitely lacks torque under 3k compared to the DE, but it feels artificially limited.

I have almost 36k miles. They didn't NEED cleaning, but they were dirty. Figured it couldn't hurt to have clean filters. It seems to me that this problem didn't occur UNTIL I put K&N's in (but I did install them within a couple months). I'll hopefully replace tomorrow with cheaper, more factory like ones.

It happens at stoplights going straight. Doesn't matter what gear. I down shifted 4-3 once to pass somebody (going relatively low speed), and it just fell on its face... probably pissed the guy behind me off since I got over and didn't go immediately.

Yea, another good test is getting on ramp and accelerating in 3rd with constant throttle (40-70%). You can feel the hesitation as it revs up towards redline (again, tech thinks it's fuel cutting). Why do we experience what the tech thinks is fuel cutting?

The factroy tune begins to cut power as you approach fuel cut for a softer bounce off of the rev limiter. You can see it on most dynos of untuned Z's pretty clearly.

It can be dialed out with tuning.

Throttle mapping can be improved for sure...ignore fuel tables in pics, not relevant for this thread.
Stock
http://i116.photobucket.com/albums/o...elthrottle.jpg

One I revised
http://i116.photobucket.com/albums/o...elthrottle.jpg

Oh no, this is not at the rev limit. This "fuel cut" feeling can be felt as the engine revs from 2k on up regardless of how much throttle is applied. It comes and goes, though. I may try to schedule test drives with the tech this spring, and hopefully he can record or monitor this behavior.

@Kastley85891 what you're able to do there is very nice, and hopefully I can get it tuned will with the FI setup :)

Wow, impressive.

oh wow, wish i knew how to do that!

Its not tough dude, just trial and error to get what best suits your driving style, mine might not work for everyone else... do you have an AP?

What is AP?

access port, and nope, dont have one.

OH, right. I was seriously considering one.
Would probably spend the extra and get the Osiris Tuner through Uprev though.

What I dont get looking at these charts, is what is the throttle plate position %? The throttle plates are open fully all the time right? So how can you get a reading from that? And how is it relative to the pedal position %?

You are just controlling how much response you are getting relative to the pedal position, if I put 75% on my pedal I really like to be nearly fully open ref plate position. NB - These are all MT
Here is a trhottle map from an STi, COBB even changed the format later but it all does the same stuff. Does not make car any quicker, just more responsive I feel, and smoother in most cases.
http://i116.photobucket.com/albums/o...ithjrottle.jpg

ok i get it better know!

I finally got a chance to get some cheap air filters. I just went to NAPA auto parts to get the cheapest filter they had. My car WAS experiencing the problem when I arrived, and it's rather cold... about 40ºF. It took about 10-15 minutes inside (an ambulance and fire truck showed up after I did, blocking me in). During that period, I went ahead and replaced the air filters. The car was fine my whole trip home. It felt great. I'll let everyone know if I still feel it with stock(ish) air filters.
It would be pretty pathetic if that was the cause.

huh... that would be weird, but very good at the same time.

I run stockish air filters and still have the gas pedal delay issue. It is not a fix...at least in my case.

I saw this random photo pop up on this site from one owner.... what do you guys think about this chart?

Nissan 370Z Forum - Dsphoto's Album: 370Z Roadster - Picture

looks like what it feels like!

The red and green lines definitely describes that stall feeling. The black line with the dip describes the "clunk" or "fuel cut" feeling where the car initially accelerates, but immediately gets weakened as if the ECU is holding back power.

Bummer =\

Holy crap... I think that's almost exactly what it is... It's good to see it on paper!

I'd just add that it feels like more than a 10-15hp drop, but that kind of visualizes it for everyone else. You get an initial surge followed by an immediate loss in power, followed by a second surge and full power. This takes place over the course of 2 seconds or so after giving the car throttle.

I was thinking that last night after I posted... It's more like a 50% drop. Considering I've had days where I almost stall out.

I think 50% is a fair assessment.

My car is bone stock and I feel this delay. In first gear coming out you get a slight lag, then it moves. My 04 350Z did not have this delay. Might be designed from factory like that?!