Nissan 370Z Forum
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Nissan 370Z Forum (http://www.the370z.com/)
-   Engine & Drivetrain (http://www.the370z.com/engine-drivetrain/)
-   -   "Bogging" in first gear (http://www.the370z.com/engine-drivetrain/55817-bogging-first-gear.html)

ANMVQ 06-06-2012 12:24 PM
I bog like that also, but Auto, If I just slam it down the car goes nowhere for like 1-2 secs then takes off, If you slowly get on it" Stated above" it should solve that, But so hard to east into it off the line, I tried to do it at the track when I was there,But could not ease in,, LOL I either slammed it 2 times and the other 3 I idle-rolled out nad then hit it, But all three of those I lose traction,, LOL spinnng everywhere.

IDZRVIT 06-06-2012 03:19 PM
Quote:
Originally Posted by bushman66 (Post 1756982)
I will take it in, just to be safe, but I'm betting they don't find anything. I'm launching at say 2000RPM (not riding the clutch too much), then punching it. The "bog" is so pronounced that it almost throws me forward into my seatbelt, then throws me back into the seat when it "catches".

My twin turbo Porsche just accelerates smoothly off the line and its a turbocharged engine where you would expect turbo lag. The 370Z, being normally aspirated, should accelerate more smoothly than that. Really the best analogy I have is when we used to mess with 60's musclecars and Holley carbs, we'd get that "bog" off the line when you'd slam your foot to the floor and we would tune it by changing out power valves, jets, etc. until we got that smooth application of power. I'd never expect a modern EFI to bog like this off the line...
Try launching at 3000-3500 rpm and report back. I don't think you're revving high enough. My 'vette will bog if I launch below 3000 and hence, I've never launched below 3000 in the Z. It never bogs at 3000 and above.

bushman66 06-06-2012 03:42 PM
Quote:
Originally Posted by IDZRVIT (Post 1757490)
Try launching at 3000-3500 rpm and report back. I don't think you're revving high enough. My 'vette will bog if I launch below 3000 and hence, I've never launched below 3000 in the Z. It never bogs at 3000 and above.
Thanks, I agree. I guess my contention is that a modern EFI engine should not "Fuel bog" at any RPM when you slam your foot into it...if that makes sense

370Z Purist 06-06-2012 07:28 PM
Quote:
Originally Posted by bushman66 (Post 1757525)
Thanks, I agree. I guess my contention is that a modern EFI engine should not "Fuel bog" at any RPM when you slam your foot into it...if that makes sense
If you let RPMs drop below 2k while off throttle and in gear, engine braking characteristics will change (harder braking after 2k, less braking before 2k). I've since gathered more or less that it's probably a VVEL profile change. If I do launch, I launch at 3-4K. No problems for me, unless I forget to turn off VDC :tup:

pedZ 06-06-2012 08:49 PM
Hey Bushman, I have some feedback from the UpRev tune. The tune definitely helped the issue. There still does seem to be a lag in the lower RPMs but it's not nearly as noticeable. I guess the best way I can explain it is that it has been smoothed out so that you don't notice it. In fact, the car is much smoother throughout the entire RPM range.

My car was running rich before the tune (in the 11s) and is now between 12.5 and 13. This helped out the car a lot and I gained 12hp overall from the tune.

bushman66 06-06-2012 09:16 PM
Quote:
Originally Posted by pedZ (Post 1757936)
Hey Bushman, I have some feedback from the UpRev tune. The tune definitely helped the issue. There still does seem to be a lag in the lower RPMs but it's not nearly as noticeable. I guess the best way I can explain it is that it has been smoothed out so that you don't notice it. In fact, the car is much smoother throughout the entire RPM range.

My car was running rich before the tune (in the 11s) and is now between 12.5 and 13. This helped out the car a lot and I gained 12hp overall from the tune.
Thanks! This is good news...I'm just debating whether its worth it or not to risk the remainder of my warranty with a tune...

pedZ 06-06-2012 09:21 PM
Quote:
Originally Posted by bushman66 (Post 1757971)
Thanks! This is good news...I'm just debating whether its worth it or not to risk the remainder of my warranty with a tune...
Yeah, there doesn't seem to be any definitive info on whether is causes warranty issues or not. I only have about 4400 miles on my Z and decided to chance it. Here in SoCal there are some dealers that are mod friendly.

Shotta 06-07-2012 06:09 PM
The 370z has a heavy flywheel at 30 lbs so thats no help to get things moving on the MT starting low in the revs.

370Z Purist 06-07-2012 06:19 PM
Quote:
Originally Posted by Shotta (Post 1759515)
The 370z has a heavy flywheel at 30 lbs so thats no help to get things moving on the MT starting low in the revs.
It's also dual mass, intended for driving comfort. Until you get that thing spinning...

ANMVQ 06-08-2012 07:42 AM
Quote:
Originally Posted by pedZ (Post 1757936)
Hey Bushman, I have some feedback from the UpRev tune. The tune definitely helped the issue. There still does seem to be a lag in the lower RPMs but it's not nearly as noticeable. I guess the best way I can explain it is that it has been smoothed out so that you don't notice it. In fact, the car is much smoother throughout the entire RPM range.

My car was running rich before the tune (in the 11s) and is now between 12.5 and 13. This helped out the car a lot and I gained 12hp overall from the tune.
About the UPREV tune, I'm on a few other forums and one guy said Nissan has a brake over ride( THis is for us auto guys) That when on the break the TB will only open 10%, Anyone else heard this, This would be why when I'm on the break the car will only rev to 2k, What the heck are they thinking installing something like that on a car, Really, Not like I want to do a burn out( AWD) but at least be able to lauch the car. Wonder if this is a table that can be change with UPREV.

DIGItonium 06-08-2012 08:48 AM
Some of us have been complaining about this since day 1. A few owners sold the 370Z because of it.

http://www.the370z.com/engine-drivet...dal-delay.html
http://www.the370z.com/engine-drivet...-response.html

It is possible to modify the throttle tables to improve response. In fact, turning off ETC in the ECU does wonders for throttle response, but you lose all the safety features.
http://www.the370z.com/tuning/43384-...tle-uprev.html

It's a strange feeling as if the ECU is holding back power because 1st gear starts are a bit rough at times when there is a noticeable transition from 1-3k RPM. There are times it really holds back power. With the foot on the ground, it feels like I'm in the wrong gear. Even the turbos take longer to spool up. It feels like it is aggressively cutting power or opening the throttle sooner.

2011 Nismo#91 06-08-2012 09:23 AM
I only get a "bogging" in first when the VDC kicks in. Happened once trying to merge onto a highway from a stop, had the guy behind me pissed, honking, because I made him brake because it too long to get going again.

sfearl1 06-08-2012 09:52 AM
It seems to get better w/ VDC off and the car warmed up (220*). Idk if it's an oil pressure thing or what, but pulling out of my subdivision in the morning is bog city. I drive 100% w/ VDC off now, since the car doesn't see the wet.

tjlazer 06-08-2012 10:07 AM
I get this too and launching at 3K RPMs helps a lot. Anything less and a Civic can take you off the line. Very embarrasing.
I did notice that this starts to happen when the oil temps get to 180+.... Hmmm

ANMVQ 06-08-2012 10:11 AM
The above was very helpful, I know my tuner did some adjments to the plate % from a dig, Is that the same thing, I may have him take a look at you file. Thanx man


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