Hesitation under 3K RPM's
 

Hi all, i have a 2013 SP Z with 6K miles, and it seems that SOMETIMES when i step on the gas under 3K rpm, the car sort of hits a wall and does not seem to accelerate too quickly. After 3k rpms, the car feels great and accelerates with no issue whatsoever. This mostly happens while on 3rd gear. i havent really changed my style of driving, meaning that this is something i was not experiencing before. Ive seen a few threads on this issue but no one seems to find a definite solution. Ive filled up in different gas stations with shell 91 oct (this is the best we have in PR unfortunately), cleaned maf sensors with maf cleaner, reset ecu disconnecting the battery but the problem is still there. Only mod is z1 maf hoses and K&N drop ins which were installed 1k~ miles ago and car felt great after install. If anyone can chime in on this, i would appreciate it. Either way, i will take it to the stealership if i cant solve the issue, but was interested in solving it myself if it was possible. Thanks guys! :tup:

O.ooops. Just noticed i sorted of posted in an incorrect area. Sorry mods, if its necessary please move to correct area. Thanks

first things first, ditch post maf tubes and get a real intake, id suggest takeda stage 2 cold air or stillen Gen 3s

second get a lightweight flywheel, clutch, CSC, and new CMC(you need to change the CSC and CMC to support the new clutch and you switch the new clutch because you are changing flywheels) these will help out the hesitation the most

third, test pipes and an exhaust

all of those should help out hesitation, i dont have that hesitation anymore and i dont have an exhaust(stock nismo exhaust) the hesitation you have is completely normal though, only real way to fix it is with a tune(it has something to do with throttle maps or something like that), all the mods i listed though will help alleviate it though

Thanks luigi, in fact an exhaust and tune are definitely on the way over the next few months and am confident that a tune can fix this. However, it is strange that this symptom was not present before(or at least is not something i had noticed), and all of a sudden does this. From what ive been reading, other people have had the same thing happen, where their car has been fine and then notice this. Not trying to be a d!ck, just pointing it out. Thanks for your reply. Any additional input will be appreciated. :tup:

ya i experienced the same thing with my Z, first few months of owning it i didnt notice any hesitation than hesitation when trying to take off from a dig until i hit 3k than i shot off

at first i thought VDC was the problem so i turned that off and was still getting it, upon further research i learned a tune will get rid of the hesitation entirely, it has something to do with VVEL and throttle tables or something of that sort

i have minimized the hesitation with my mods but it still happens once and a blue moon(2 months ago was the last time i had felt that hesitation) but i think its just something we all noticed after some time with ownership

Thanks luigi, kind of f*cked up that this issue happens to some of us. My car is due for maintenance soon(free oil change ftw... Or loss, not sure :shakes head:) so ill still go and bother the mechanics at the stealership with the issue and see what they diagnose. Cant wait to hear what kind of bullsh*t they tell me. If any input is worth sharing, ill let you know.

Thanks again.

I look forward to it, if it is an issue, then nissan should do something about it

Isn't there a reset for the gas pedal? Maybe reset that.

A little lag may be normal but is it as bad as this?

http://m.youtube.com/watch?v=k-LPrNwDrYE

I'll be honest it seems kinda normal, then again it was so shaky and hard to really see. You aren't really into your torque band until after 3k RPMs.

It is an automatic and if it's not downshifting, well I can't tell you why that's happening.

Didnt know there was a reset for the gas pedal... Ill search but if someone would like to share the instructions, please do.

Ill take a look at the video when i get home tonight, hard to see in my phone. Thanks!!!

Hey Elan! Good to hear from you. True about the tq band, its just that since this was not an issue before is what has me thinking that it isnt normal. Maybe im being a bit anal, but hey, im paying good money for this car, so expectations are high.

Thanks for your reply :tiphat:

Hmm so is your car not downshifting to a low enough gear like it should? Does it feel better in paddle shift mode?

i think his problem is partially because he is overheating his G(since there isnt an oil temp sensor) so his car is cutting a lot of timing exaggerating the bogging effect, i normally dont feel any bog at all unless im really heat soaked either from running the car too hard(260 oil temps) or sitting in traffic for a long time(mostly due to short rams but when i get moving the bogging effect goes away as IATs drop)

Where did you get the OP has a G? He clearly states in his first post it's a 2013 SP Z with 6k.

watch the video someone posted about an auto G bro, read the thread before commenting

EDIT
OP has a 6MT 370z im assuming since he is talking about bogging on 3rd gear

I was trying to stick to the dudes problem not what other's are coming up with. Not really sure why an automatic G came into this discussion in the first place. No transmission issues are ever the same between AT and MT


I'll :bowrofl: to your response being on point to an off topic post...

i think it was used as an example and Elan took off from there, i was replying to Elan's response since that doesnt look normal for an AT to be lagging that bad, the video showed shifting and bogging worse than my DSM(and thats a 90s slushbox)

either way, i think OP's Z is begging him to mod it :stirthepot:

We should all be modding!!!:rofl2:

That is correct...6mt

And I will obey my Z's needs... :stirthepot:

:icon18: thank you sir :tiphat:

Someone posted a video of an auto G. I addressed that issue! :icon23:

Hey guys, just a bit of an update: i found a gas station with 93oct, so i filled the tank up, reset ecu and have been driving 5 days hesitation free, in fact..." car feels awesome! :happydance: its surprising what a difference 2oct make!

Maybe im getting a bit ahead of myself, but it looks like the issue might be solved(knock on wood)!!! ill keep you guys posted :tup:

Hey guys, just another update...two full weeks hesitation free!

Can say enough of how much better the car feel with 93oct gas. A smoother response and definitely more powa!!! :rofl2:

Hope this can help someone in the future and runs into the same luck

Man I thought it was just me - I get the same hesitation every once in a while if I'm upshifting too low in the RPM band; I have a '14 Nismo. I use 93 octane all the time, but I guess a combination of Florida heat and low RPM shifts = unhappy Z

Sorry to hear that man. For me, 93oct has been working fine on my Z since then. Maybe some modding and tuning as others suggested might do the trick :stirthepot:

Have you tried different brands by any chance?

Some of these posts are laughable. Or ludicrous. So you're telling him to spend a couple thousand dollars to mod his car.....to overcome an issue, yet has nothing to do with his problem?? How about a solution relating to it? Or information? Yeah that's an idea. These boards get some crazy replies sometimes. It's either someone passing along a "fact" they heard or recommending someone replace multiple parts. Yeah sure it's not my money go ahead, why not? Don't forget to upgrade the rear end too.

More mods isn't going to help a software issue below 3k rpm.

With all due respect to those who are trying to help with the problem, 'funkdoobiest' makes a great point. I wish I had a dollar for every miss-placed online performance recommendation. I've been modifying cars, motorcycles and ATVs for long time. Some of the online advise that I have used has resulted in no difference, more problems or in a blown engine and lots of money down the drain. Some has been very valuable! Online forums are often times basically just opinion boards so the reader beware. They DO provide a valuable asset for those looking for answers but owners must give careful consideration on online advise. There are lot of variables but like every other car 370z's have certain traits.

I too have a hesitation on my stock 2014 Z auto with a Stillen cat back and it's really getting under my skin. It really sucks when you plan to (safely) dart out into traffic (like all Z drivers yearn to do from time to time) from a dead stop depressing the throttle about 25% to 50% and you are waiting a second or so for the engine to rev...... it feels like the engine is going to die in traffic. Is this hesitation simply a 370z thing or is there really a fix for it? I read in Car and Driver review of the 2015 that this is a problem with the automatics. My Z did not seem to do it before 5000 miles, but then again it could be just me as I get into the throttle more than when it was new. I try to stay away from the insidious gasohol. It's easy to say that one needs to do this and do that to fix it, I fear that the people who really know what the issue may be could too too busy to for input. It seems to me to be a programming issue for emissions, maybe restricted intake flow? I have a liter bike that used to do the same until I bumped the idle up a few hundred rpm and it went away, the fuel flow was too lean and the throttle body was closed too much at idle to respond to a rapid change in throttle. Maybe dirty throttle bodies? Just throwing thoughts out there.

The ECM may be pulling timing because of "high" IAT (as measured at the MAF). IIRC, it starts pulling timing around 85 degF.

Get an OBD/CAN monitor and check AFRs, O2s, &c; you may need a tune.

Just my .02 cents, I too was taken aback when I punched the throttle in 1st gear and there was nothing. That began my quest to resolve the issue.
http://www.the370z.com/nissan-370z-g...g-like-mf.html

Now, I can get her sideways off the line :D Actually it's kinda scary now...I can only imagine what the boosted guys are experiencing.