Lol I did that freaking flush like 3-4 times too!!! Leave me alone XD hahahah


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Ran into this, might be of help? Idk worth taking a look at, read the description :)

https://www.stillen.com/performance/...ssan-370z.html

"These grounding kits will also improve the shifting on automatic transmission vehicles, and in most cases noticeably improve shift times and reduce lag."


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That's not it, it's a known issue with some. Even on 6MT. It might be related to intake temps. When I start having this problem I have to launch at 3000 RPMs to avoid this issue, very frustrating!

Oh then in that case, a tubbing will help you millions with this issue but yeah I agree. The temp makes the car lag. I just simply suggest a good venting body kit i.e. Fenders bumper and hood haha. Blast your heater with the windows down :)


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Hot climate sucks
 

Gents, it is 33-38 degC plus humid all year long here in Malaysia, i've been having this trottle delay since my 1st day ownership. Have anyone tried use another IAT sensor which has the same resistance curve as OEM and relocate it to the mouth of the intake? It is embarrassingly slow to take off in any low gear when the rpm is around 1-3k, above that it scream all the way to redline. In a heavy traffic jam, IAT is always about 40-50 degC above cabin ambient temp reading, i logged all this with OBD2 and Nissan Datascan III app since the car is JDM. No issue with brake switch as i can see the value for both sensor switched. Idle timing was awfully low at about 3 compared to 9 when cold start. The only thing i've been wanting to check is the knock register and MAP sensor barometer volt value but theres no parameter of it in the Android app i have, no codes either. Maybe that was caused of the timing retard, had checked flexplate and theres no crack. Also have tried removing the MAP sensor driving with CEL codes and it didnt improve or making it worst. Happen on either full tank of fuel or low. Only good temporary solution that work only for short period of time ~15 mins is refuelling when near empty ~ 40 litre. Nissan tech had even datalog with consult III while me driving and cant find anything wrong.

Intake were all stock with addition of 36 row Z1 oil cooler and 25 row AT cooler to the sides. I really hopes we as a community get to solve this teething heatsoak issue. Car had 125000 KM already since i daily drive it to work since 2010. My next fault finding would be to replace MAP sensor and see if it is faulty. Envy you guys in colder climate country.

ZeN,
Please refer to my earlier posts. I detailed exactly what you propose on doing. I have done it before and it works, and later on after a lot of research i went several steps further to restore a more consistent driving experience.

In short, the 370Z really suffers from heatsoaked intake air temperature sensor. All intake systems are affected. All your observations mirror mine so there is nothing 'wrong' with your car. It is doing everything as it is programmed to do. There is a solution but it's not for those who love to show off their engine bays - although it's definitely a conversation starter. Goodluck & happy modding!

Lethargic
 

HI,

I have the same issues when it gets hot outside, my 370z turns into a Nissan Sentra.....Bogged down lethargic acceleration and laggy throttle response from idle up to about 3500RPM.

Did anyone come up with an ECU fix for this?

Has anyone approached Nissan to do a software update on the car or at least the ECU?

When i reflashed a different throttle map using Uprev, it cured it. Aside from the heatsoak issues but you need to determine which you have - heatsoak lag or the actual unrelated lag for no reason

I have this and it made a huge difference. Throttle response is now linear. While this can be fixed in a tune, using this makes adjustability much easier so I plan to keep mine even after I get it tuned

I thought the same thing until I actually had my car tuned. I turned it on once afterwards and felt it was useless at that point so about to sell it.

Is there anyway that an UPREV tune can address this throttle response when IAT temps are higher?

Uprev
 

Thanks guys for the info...


How can I get my hands on this Uprev ECU reflash?.....Mine is Heatsoak I believe.

You cant do anything tuning-wise to reduce the impact of heatsoak. The only solution is to address the heatsoak problem - insulate, reflect and relocate. Heatsoak is inevitable. You goal is to delay its onset.

After so many years since i left the platform i am amazed Nissan has not done anything to fix the problem. But you guys as owners need to determine whether there is truly a bug in the ECU software or whether it is simply lag due to pulled timing due to high IAT (actual or false due to heatsoak). For me, in the end it seemed most like a bug in the throttle map or the way the ECU processes input from the gas pedal to output to the twin throttle bodies. It is a complicated system with VVEL, two throttle bodies, and having to manage brake booster vacuum also.

The best way to describe what is happening is the ECU thinks there is a problem with the throttle control so to prevent uncontrolled acceleration, it puts the motor into limp mode without illuminating the CEL. Acceleration up to 3500rpm will be extremely poor and scary when pulling out of junctions. Just like limp mode. Restart the motor and it clears. Leaves no trace.

Those of you with Uprev, i strongly suggest loading a new throttle map and test it out. I wished i still had my Z to continue this witch hunt for you guys but good on you all for sticking to what is an awesome bang for buck car. These days i drive an E82 135i which longs to handle like a Z haha

This is definitely limp mode. I was having similar issues when I went to 3" MAF housings. Check to make sure there aren't any soft codes sitting in the background on your ECU. I've experienced limp mode multiple times with no CEL but the soft code was present in the background when I scanned it. Sometimes those soft codes can come and go if the problem is intermittent so scan the car often and maybe you can catch it. FYI between 2009 and 2014 Nissan used a P006A code (MAF/MAP to throttle position correlation) which came up often, even on factory stock cars. In later ROMs Nissan removed it because it was too problematic.

Side note: the wstar's 2300 throttle map is pretty good. That's what I'm running currently.. could be a bit more aggressive at lower RPMs But it does get the TBs open much quicker than stock and is stable over all

Hello everyone, I guess for documenting purposes and to find out what else have folks discovered in the 4 years that have passed since this.

I have gathered that one way to help with this delay is a tune, the other delay has to do with heat soak of the IAT. Lastly for those boosted, issues with the booster MAP.

Throttle pedal commanders seem not be as efficient after a tune.

I have adjustable throttle response with my ecutek tune

Not sure if I’m on to something or not, but I was having issues with a P0300 code for a long time and finally got that resolved by cleaning my MAF’s. Haven’t had any gas pedal issues since.

Wow. This thread was a damn good read. All the way from the 1st page. Only reason I'm here is because of that dreaded gas pedal delay and laggy throttle response. Heat soak and IAT sounds like a logical cause. The reason I'm sure is because throttle response during warm up from cold start is nice and crisp as many have stated already. But once that oil temps warm up you can definitely feel a decline in throttle response at low rev ranges below 3k vs what your input is with the gas pedal.

That one video that showed the behaviour of the revs with quick slamming of the pedal vs gradual smooth input is really telling. That rev hanging under acceleration is also interesting which is exactly what I experience when the engine is hot either from DD'ing or a little spirited driving with the gas pedal delay. I'm hoping someone here can explain this phenomenon with the VQ37.

One thing that hasn't been touched much over the 50+ pages of this thread is if running lean or excessively lean, or a hidden vacuum leak would cause poor throttle response due to the ECU retarding the timing for VVEL to protect further engine damage. I know watching the behaviours of short trim fuels is a good way to tell if you're running too lean or too rich.

But basically the current solution is:
1. Get a tune with improved throttle maps
2. Isolate heatsoak
3. Somehow retrofit more fans to improve cooling (no idea if anyone has done this)
4. Install and keep throttle controllers (sprintbooster) for the added placebo effect

Unless some tuners have found the golden ticket to finally eliminating this problem. I would really like to know. Many Z owners would benefit from this.

After reading this monster of a thread my conclusion would be to just get a tune and install sprintbooster incase it is needed for really hot ambient temp days. And see how it goes from there. Might look into some heat soak solutions later on too.

It's a shame the VQ37VHR doesn't have better heat management systems. Otherwise this v6 would be amazing.

Best of luck to you!

If you have a tune, it is truly a waste of money to also install a throttle controller (sprint booster). Just program the throttle maps in the tune to exactly what you want. The tune can program 100% throttle at 10% pedal if you so desired. Don't do that but just realize the sprint booster increases voltage which can simply be replicated exactly in the tune via programming. You can program different tune maps same as the sprint booster has different modes.

:iagree:

I'm not going to really read over the previous 70ish pages but is this issue related to when ecu sees full accelerator pedal position but delays opening of the throttle bodies? Noticed that happening in my ecutek logs before, didn't really feel it but there was for sure a delay between the two.

Generally that's the idea. It's an inherent issue with the pedal position sensor relative to the ECU's time to process the voltage signal inputs. ie. gas pedal pressed at like 50% to the floor as input and ECU translates it as about 10% output. Which can definitely affect throttle body plate actuation at low revs. Which would contradict the purpose of VVEL. Until recently I was told that the throttle plates ARE NOT fully open at low revs. Why this isn't an issue at high rev ranges i'd have to guess it's something to do with VVEL also.

Couple that with a very common and highly debated topic of heatsoak with the VQ37VHR due to high IATs and heat radiation from the engine bay exacerbates this issue even more.

Turning VDC off helps a little bit but not much.

On a good note. Contacted my local tuner that regularly tunes 370z with Uprev. They say most of the gas pedal delay is gone by tweaking the throttle maps with the standard tune (opening up the power band at low-mid RPM ranges) plus multiple modes. But they confirm it is still there albeit less noticeable.