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Nissan 370Z Forum (http://www.the370z.com/)
-   Engine & Drivetrain (http://www.the370z.com/engine-drivetrain/)
-   -   Gas Pedal Delay (http://www.the370z.com/engine-drivetrain/20402-gas-pedal-delay.html)

IcedZ 12-24-2010 11:45 PM
Quote:
Originally Posted by DIGItonium (Post 864956)
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.

wilsonp 12-25-2010 07:52 PM
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?

Junior370z 12-25-2010 09:20 PM
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!

DIGItonium 12-26-2010 03:54 PM
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.

IcedZ 12-26-2010 05:51 PM
Quote:
Originally Posted by wilsonp (Post 866488)
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?
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.

DIGItonium 12-26-2010 06:16 PM
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?

Jordo! 12-26-2010 07:59 PM
Quote:
Originally Posted by DIGItonium (Post 867201)
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.

Kastley85891 12-26-2010 08:12 PM
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

DIGItonium 12-27-2010 01:38 AM
Quote:
Originally Posted by Jordo! (Post 867259)
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.
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 :)

IcedZ 12-27-2010 08:13 AM
Quote:
Originally Posted by Kastley85891 (Post 867271)
Throttle mapping can be improved for sure...ignore fuel tables in pics, not relevant for this thread.
Wow, impressive.

6spd 12-27-2010 09:11 AM
Quote:
Originally Posted by Kastley85891 (Post 867271)
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 wow, wish i knew how to do that!

Kastley85891 12-27-2010 09:15 AM
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?

IcedZ 12-27-2010 10:14 AM
Quote:
Originally Posted by Kastley85891 (Post 867699)
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?

6spd 12-27-2010 10:38 AM
Quote:
Originally Posted by IcedZ (Post 867733)
What is AP?
access port, and nope, dont have one.

IcedZ 12-27-2010 10:39 AM
Quote:
Originally Posted by 6spd (Post 867761)
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.


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