"Bogging" in first gear

bushman66 · 06-05-2012, 10:16 PM

Quote:

Originally Posted by pedZ

I know exactly what you are talking about bushman. I notice the same problem at lower RPMs. Specifically in 1st, 2nd, or 3rd gear. I'm actually getting a Uprev tune tomorrow so I'll report back to this thread on whether it helps or not.

I'm stuck...I'm pretty sure a tune would fix this issue, but at 6K miles, I'm still way inside warranty.

jhh343 · 06-05-2012, 10:18 PM

The vdc will actively cut power. What you are talking about happens all the time to me. Even though you are on the pedal there is no respose. It's drive by wire. If you get on the gas smooth enough it doesn't happen. When you turn vdc off the tires will spin all day without any weird power cuts. Maybe you guys have something more extreme going on and there maybe a problem but it doesn't sound too different from what I have seen. I have read on here that a heavier flywheel can help minimize the bog down on a hard launch, but it will take longer to spin up.

bushman66 · 06-05-2012, 10:32 PM

Quote:

Originally Posted by jhh343

The vdc will actively cut power. What you are talking about happens all the time to me. Even though you are on the pedal there is no respose. It's drive by wire. If you get on the gas smooth enough it doesn't happen. When you turn vdc off the tires will spin all day without any weird power cuts. Maybe you guys have something more extreme going on and there maybe a problem but it doesn't sound too different from what I have seen. I have read on here that a heavier flywheel can help minimize the bog down on a hard launch, but it will take longer to spin up.

OK, I'll try this out...thanks JHH343. If this is the case, then VDC is WAY too conservative...

jhh343 · 06-05-2012, 10:44 PM

Quote:

Originally Posted by bushman66

OK, I'll try this out...thanks JHH343. If this is the case, then VDC is WAY too conservative...

There is a lot of discussion about how intrusive it is on this forum. You can't even completely turn it off without removing something under the console. If you can be real smooth with the steering/throttle inputs, it will leave you alone. It still gets me from time to time though. Hope it solves your problem.

bushman66 · 06-06-2012, 02:53 AM

VDC off...still getting the "bog". I'm convinced its in the factory tune...

IDZRVIT · 06-06-2012, 06:51 AM

Do have a manual or an automatic?

370Z Purist · 06-06-2012, 09:45 AM

This may answer your question:

Throttle Response: DE/HR vs VHR

bushman66 · 06-06-2012, 09:45 AM

6 Spd Manual...Sport Package. This is completely frustrating...may have to go the custom tune route, warranty be damned...

Streetlife · 06-06-2012, 10:12 AM

Quote:

Originally Posted by bushman66

6 Spd Manual...Sport Package. This is completely frustrating...may have to go the custom tune route, warranty be damned...

You might want to let Nissan look at it first, just to be on the safe side.

bushman66 · 06-06-2012, 11:10 AM

Quote:

Originally Posted by 370Z Purist

This may answer your question:

Throttle Response: DE/HR vs VHR

THIS is exactly what I am feeling, its a huge dead spot off the line (independent of the throttle position) until it "catches" and accelerates. This piss poor factory throttle mapping really kills the enjoyment of the car. I guess my only alternative is to roll the dice and do the custom tune (Uprev?) or live with it until the warranty expires.

IDZRVIT · 06-06-2012, 11:34 AM

Quote:

Originally Posted by Streetlife

You might want to let Nissan look at it first, just to be on the safe side.

Bushman66, take his advice.

cheshirecat · 06-06-2012, 11:40 AM

some people have reported better throttle response with the sprint booster. while I haven't used it personally, I figured I'd just throw that in here.

Cmike2780 · 06-06-2012, 12:00 PM

A ton of variables, so I would run through everything to pinpoint the problem. If you haven't done so already, check the intake side of the equation for anything coming loose or a dirt filter. I found leaves in the intake the first time I cleaned it out. It might even be something as simple as a bad batch of gas. It just seems odd that an CBE alone would throw off the ECU that much.

Are you trying to lauch the car off the line...and if so @ what rpm?

bushman66 · 06-06-2012, 12:30 PM

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...

fuct · 06-06-2012, 12:35 PM

Quote:

Originally Posted by bushman66

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...

im not bogging like this, maybe there really is a problem.

06-06-2012, 06:51 AM	#21 (permalink)
IDZRVIT A True Z Fanatic Join Date: May 2009 Location: Halifax Posts: 1,659 Drives: '13 CTS-V, '76 Vette Rep Power: 27	Do have a manual or an automatic? __________________ "America.... still builds rockets!" Vette: 355 cid, 400 rwhp '13 CTS-V Coupe: 6.2L LSA, 556HP

06-06-2012, 09:45 AM	#22 (permalink)
370Z Purist A True Z Fanatic Join Date: Jun 2009 Location: Zion, Illinois Posts: 1,873 Drives: '09 370Z-T BS M6 Rep Power: 19	This may answer your question: Throttle Response: DE/HR vs VHR __________________ -Phil "Since one of my brake light bulbs just went out, the forum told me that my piston rings are about to blow."

06-06-2012, 12:00 PM	#28 (permalink)
Cmike2780 A True Z Fanatic Join Date: Jun 2010 Location: Long Island Posts: 5,059 Drives: slowwww Rep Power: 29	A ton of variables, so I would run through everything to pinpoint the problem. If you haven't done so already, check the intake side of the equation for anything coming loose or a dirt filter. I found leaves in the intake the first time I cleaned it out. It might even be something as simple as a bad batch of gas. It just seems odd that an CBE alone would throw off the ECU that much. Are you trying to lauch the car off the line...and if so @ what rpm? __________________ [09][MB][6-Spd MT][Touring][Stillen Gen III][K&N][Borla CBE][Evo-R] [ArchitTEK Photography]

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06-05-2012, 10:18 PM	#17 (permalink)
jhh343 Base Member Join Date: May 2010 Location: Austin Posts: 25 Drives: '10 370Z 6MT Rep Power: 15	The vdc will actively cut power. What you are talking about happens all the time to me. Even though you are on the pedal there is no respose. It's drive by wire. If you get on the gas smooth enough it doesn't happen. When you turn vdc off the tires will spin all day without any weird power cuts. Maybe you guys have something more extreme going on and there maybe a problem but it doesn't sound too different from what I have seen. I have read on here that a heavier flywheel can help minimize the bog down on a hard launch, but it will take longer to spin up.

06-06-2012, 02:53 AM	#20 (permalink)
bushman66 Base Member Join Date: May 2010 Location: AZ Posts: 112 Drives: 2012 370Z Red Sp Pkg Rep Power: 15	VDC off...still getting the "bog". I'm convinced its in the factory tune...

06-06-2012, 09:45 AM	#23 (permalink)
bushman66 Base Member Join Date: May 2010 Location: AZ Posts: 112 Drives: 2012 370Z Red Sp Pkg Rep Power: 15	6 Spd Manual...Sport Package. This is completely frustrating...may have to go the custom tune route, warranty be damned...

06-06-2012, 11:40 AM	#27 (permalink)
cheshirecat A True Z Fanatic Join Date: Jan 2009 Location: Florida Posts: 1,428 Drives: N54 135i Rep Power: 293	some people have reported better throttle response with the sprint booster. while I haven't used it personally, I figured I'd just throw that in here.

06-06-2012, 12:30 PM	#29 (permalink)
bushman66 Base Member Join Date: May 2010 Location: AZ Posts: 112 Drives: 2012 370Z Red Sp Pkg Rep Power: 15	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...