Engine doesn't seem free revving

iwasgointo · 08-29-2010, 03:07 PM

My 09 370Z with 7800 miles and manual trans doesn't seem to be as free revving as I'd like. My daily driver is an 06 Honda Element with a 2.4 ltr four cylinder engine and a manual trans, it has 58,000 miles on it.

When I rev the Honda from idle or any other rpm it responds quickly and willingly. The 370Z on the other hand is slower to rev and seems to be held back somewhat.

Would this be normal when comparing a high powered V6 to a much less powerful 4 cylinder, or will the Nissan rev more quickly as the mileage adds up and engine loosens up a bit?

Or perhaps, the 370Z has a larger, heavier flywheel that will never allow it to be as responsive as the much smaller Honda engine.

Of course, in normal driving and especially when merging onto the highway the
370Z gets me up to speed in a hurry.

fullmonty · 08-29-2010, 03:19 PM

If you are revving in Neutral there is a lock of sorts so that you won't over rev the engine.

iwasgointo · 08-29-2010, 04:50 PM

Quote:

Originally Posted by fullmonty

If you are revving in Neutral there is a lock of sorts so that you won't over rev the engine.

Yes, I am revving in neutral at a stand still, and I have noticed that there is a rev limit of about 4500 rpm when in neutral and a no load condition. No doubt this is a good thing.

I suppose, what I may be experiencing is this rev limiter in action. Although, I will say that when blipping the throttle for a down shift I would like a quicker response.

Blipping the throttle for a down shift is a new thing for me so, perhaps, it's just an adjustment on my part that's needed.

spearfish25 · 08-29-2010, 05:01 PM

No, the Z is ungodly slow to respond. It's partly the heavy flywheel and the partly the electronic throttle. I'm looking into the Speed Booster which improves throttle response as a possible solution.

RCZ · 08-29-2010, 05:37 PM

Alex, can you tell us more about the speed booster?

A lightened flywheel and crank pulley helps a lot with the lazy revving.

AndyZ · 08-29-2010, 06:26 PM

same here lighter pulley and flywheel helped alot, except for the noise

JB-370z · 08-29-2010, 06:43 PM

Quote:

Originally Posted by RCZ

Alex, can you tell us more about the speed booster?

A lightened flywheel and crank pulley helps a lot with the lazy revving.

I need to fix this issue. It makes the engine feel very much un-refined and lazy like you said.

iwasgointo · 08-29-2010, 08:00 PM

[QUOTE=RCZ;699481]Alex, can you tell us more about the speed booster?

I found out this product is called the "Sprint Booster" and it attaches to your gas pedal. There are a couple of install videos on You Tube. It looks real easy to install and is pricey at $329 for something so simple, but it's probably well worth the cost if it's built to last the life of the vehicle.

I want to get this product, but dang it, why is everything I want so costly?
WHY DO I ALWAYS HAVE TO SUFFER?

vehl · 08-29-2010, 08:56 PM

^ if it does what it says, $329 is cheap..

wilsonp · 08-29-2010, 09:47 PM

At that price, could a similar effect be built in to a tune?

ImportConvert · 08-29-2010, 11:05 PM

Accelerator by wire technology is still lacking imho.

That and a massively heavy flywheel.

red6spd · 08-29-2010, 11:55 PM

I hear the UpRev tune gets rid of the throttle lag a lot of guys speak of. Think that may help????

ImportConvert · 08-30-2010, 12:51 AM

Quote:

Originally Posted by red6spd

I hear the UpRev tune gets rid of the throttle lag a lot of guys speak of. Think that may help????

Mustangs, 'vettes, etc. I have talked to the owners of after a tune always say a good tune fixes the issue.

spearfish25 · 08-30-2010, 07:57 AM

I emailed the speed booster folks and I'm working out either a free demo or a 30 day trial with money back guarantee. I'll post something as soon as I know more. Hopefully it helps response rather than just make the throttle a hair-trigger on/off switch.

NonStopTuning · 08-30-2010, 07:12 PM

Quote:

Originally Posted by RCZ

Alex, can you tell us more about the speed booster?

A lightened flywheel and crank pulley helps a lot with the lazy revving.

Quote:

Originally Posted by AndyZ

same here lighter pulley and flywheel helped alot, except for the noise

NST Pulleys do help in this department

08-29-2010, 03:07 PM	#1 (permalink)
iwasgointo Base Member Join Date: Aug 2010 Location: philadeelphia Posts: 16 Drives: 09 Infiniti G37S Rep Power: 15	Engine doesn't seem free revving My 09 370Z with 7800 miles and manual trans doesn't seem to be as free revving as I'd like. My daily driver is an 06 Honda Element with a 2.4 ltr four cylinder engine and a manual trans, it has 58,000 miles on it. When I rev the Honda from idle or any other rpm it responds quickly and willingly. The 370Z on the other hand is slower to rev and seems to be held back somewhat. Would this be normal when comparing a high powered V6 to a much less powerful 4 cylinder, or will the Nissan rev more quickly as the mileage adds up and engine loosens up a bit? Or perhaps, the 370Z has a larger, heavier flywheel that will never allow it to be as responsive as the much smaller Honda engine. Of course, in normal driving and especially when merging onto the highway the 370Z gets me up to speed in a hurry.

08-29-2010, 03:19 PM	#2 (permalink)
fullmonty A True Z Fanatic Join Date: Nov 2009 Location: Dirty Jersey Posts: 7,762 Drives: 370 Touring/Sport Rep Power: 34	If you are revving in Neutral there is a lock of sorts so that you won't over rev the engine. __________________

08-29-2010, 05:01 PM	#4 (permalink)
spearfish25 A True Z Fanatic Join Date: Mar 2009 Location: Naples, FL Posts: 4,117 Drives: to work Rep Power: 1856	No, the Z is ungodly slow to respond. It's partly the heavy flywheel and the partly the electronic throttle. I'm looking into the Speed Booster which improves throttle response as a possible solution. __________________ 2013 Cadillac V-Wagon, RIP Z

08-29-2010, 05:37 PM	#5 (permalink)
RCZ A True Z Fanatic Join Date: Nov 2008 Location: Miami Posts: 6,403 Drives: '09 370Z Rep Power: 1118	Alex, can you tell us more about the speed booster? A lightened flywheel and crank pulley helps a lot with the lazy revving. Last edited by RCZ; 08-29-2010 at 05:40 PM.

08-29-2010, 06:26 PM	#6 (permalink)
AndyZ Enthusiast Member Join Date: Dec 2009 Location: Santa clara Age: 35 Posts: 334 Drives: Ford Escort "100HP" Rep Power: 15	same here lighter pulley and flywheel helped alot, except for the noise __________________ NOR CAL TT Z34 Next - Built Engine / V-tec?

08-29-2010, 08:00 PM	#8 (permalink)
iwasgointo Base Member Join Date: Aug 2010 Location: philadeelphia Posts: 16 Drives: 09 Infiniti G37S Rep Power: 15	[QUOTE=RCZ;699481]Alex, can you tell us more about the speed booster? I found out this product is called the "Sprint Booster" and it attaches to your gas pedal. There are a couple of install videos on You Tube. It looks real easy to install and is pricey at $329 for something so simple, but it's probably well worth the cost if it's built to last the life of the vehicle. I want to get this product, but dang it, why is everything I want so costly? WHY DO I ALWAYS HAVE TO SUFFER? Last edited by iwasgointo; 08-29-2010 at 08:28 PM.

08-29-2010, 08:56 PM	#9 (permalink)
vehl Base Member Join Date: Dec 2008 Location: asia Posts: 140 Drives: 370z PW/ GTI Rep Power: 16	^ if it does what it says, $329 is cheap..

08-29-2010, 09:47 PM	#10 (permalink)
wilsonp A True Z Fanatic Join Date: Jul 2010 Location: Virginia Posts: 1,134 Drives: 2009 Touring Sp Nav Rep Power: 17	At that price, could a similar effect be built in to a tune? __________________ 2014 Cayman S PDK Sport Chrono White/Black Was 2009 370Z Touring Sport+Nav 7AT Metallic Black/Persimmon Was 1991 NSX Auto Black/Black

08-29-2010, 11:05 PM	#11 (permalink)
ImportConvert A True Z Fanatic Join Date: Jun 2010 Location: SWMO Posts: 4,454 Drives: 2019 CX5 GT Reserve Rep Power: 7627	Accelerator by wire technology is still lacking imho. That and a massively heavy flywheel.

08-29-2010, 11:55 PM	#12 (permalink)
red6spd A True Z Fanatic Join Date: Apr 2010 Location: Long Island NY Posts: 3,277 Drives: 2010 Z Coupe M6 SPT Rep Power: 21	I hear the UpRev tune gets rid of the throttle lag a lot of guys speak of. Think that may help???? __________________ 2010 Base+Sport 6spd: Stillen G3, FI Non-Resonated CBE, FI Non-Resonated Test Pipes, UpRev Tuned, Custom 24R Oil Cooler, JDM Rear Fog-OEM Harness. ???Whp ???WTQ (Will find out come spring time)

08-30-2010, 07:57 AM	#14 (permalink)
spearfish25 A True Z Fanatic Join Date: Mar 2009 Location: Naples, FL Posts: 4,117 Drives: to work Rep Power: 1856	I emailed the speed booster folks and I'm working out either a free demo or a 30 day trial with money back guarantee. I'll post something as soon as I know more. Hopefully it helps response rather than just make the throttle a hair-trigger on/off switch. __________________ 2013 Cadillac V-Wagon, RIP Z

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