BANG when powershifting

initialgemini · 02-16-2010, 02:19 PM

What a beautiful Z.

RCZ · 02-16-2010, 04:34 PM

Quote:

Originally Posted by phunk

I find it rather humorous that people are so concerned about powershifting.... I would love to see the look on some of your faces if i did it in your car. i hold my right foot on the gas, dead straight on the floor as if i was balancing my body weight on it... i hold my left foot about 1 foot in the air.... just as the rev limit is kicking in, i bruce lee jab-kick the clutch peddle to the floor... some coordinated time after i felt my left foot begin to make contact with the clutch, i begin to yank the shifter with a "no looking back now" effort (cant afford one of those accidental half shifts) and by the time the shifter is done moving my foot has left the clutch and you usually only heard the rev limit bounce once if at all.

I'd open the door and give you a gentle shove out at 80mph. jk.

I thought you were ramming gears without using the clutch. What you speak of here is nowhere as bad as that. Youre just flat foot shifting... nothing but wearing out the clutch in this case. Specially if you have a twin plate carbon one which engages more smoothly than a normal clutch would.

Do you DD that 350z?

t-ray · 02-16-2010, 06:21 PM

Quote:

Originally Posted by RCZ

^ well over 300 passes + other abuse and you're wondering if its the transmission's fault?

No, those things you can't do are due to the abuse, synchros are probably messed up to hell. The transmission in our cars ins't designed to withstand that much abuse, they aren't race transmissions.

Wait, are you telling me that I am abusing my car? Seriously? Thanks for the newsflash.

I'm not wondering "if it's the transmission's fault." Obviously my use of the car far exceeds anything any of its constituent components were realistically designed to do. Rather, I was asking phunk what his thoughts were on why his transmission has functioned so well for so long, considering it too has seen abuse.

Like him, I'm talking about full throttle shifting. I use the clutch, I just don't lift off the throttle(except for 1>2). I also have an aftermarket clutch, and a lightweight flywheel, but I'm making half his power(~265whp).

Somewhat on topic - there's a fascinating thread over on the "other site" where the 6mt was torn apart and the internals analyzed. It's no longer a sticky, as it's over three years old now, but if you're interested, it was started by a guy named BriGuyMax. It has picture of the actual individual gears - interesting reading. In fact, phunk posted in that thread.

370Zsteve · 02-16-2010, 07:23 PM

Quote:

Originally Posted by phunk

I will challenge you at this. What stakes do you choose?

Fish-slapping at dawn

RCZ · 02-16-2010, 08:37 PM

Quote:

Originally Posted by t-ray

Wait, are you telling me that I am abusing my car? Seriously? Thanks for the newsflash.

I'm not wondering "if it's the transmission's fault." Obviously my use of the car far exceeds anything any of its constituent components were realistically designed to do. Rather, I was asking phunk what his thoughts were on why his transmission has functioned so well for so long, considering it too has seen abuse.

Like him, I'm talking about full throttle shifting. I use the clutch, I just don't lift off the throttle(except for 1>2). I also have an aftermarket clutch, and a lightweight flywheel, but I'm making half his power(~265whp).

Somewhat on topic - there's a fascinating thread over on the "other site" where the 6mt was torn apart and the internals analyzed. It's no longer a sticky, as it's over three years old now, but if you're interested, it was started by a guy named BriGuyMax. It has picture of the actual individual gears - interesting reading. In fact, phunk posted in that thread.

What kind of clutch is it? Maybe if its a grabbier clutch the shock is putting more stress on the parts..

Different transmissions behave differently and will degrade differently even if put through the same abuse. You know there are minute cracks and imperfections in the pieces from the factory and many more are created over time. Its a matter of putting enough stress on them and parts start to fail. There are an infinite number of factors that could have lead to your issues, an infinite number of different situations. I think its a long shot that you could find a realistic answer to why your tranny broke in 5 years, not in 6.

But, go on.

Tyrell Tyson · 02-19-2010, 09:11 AM

*looks around*

- Ty

simota1 · 02-19-2010, 05:35 PM

Quote:

Originally Posted by 370Zsteve

Fish-slapping at dawn

LMAO

welcome to the forum phunk

im in for products u make

Black370z · 02-23-2010, 04:42 PM

Quote:

Originally Posted by phunk

I find it rather humorous that people are so concerned about powershifting.... I would love to see the look on some of your faces if i did it in your car. i hold my right foot on the gas, dead straight on the floor as if i was balancing my body weight on it... i hold my left foot about 1 foot in the air.... just as the rev limit is kicking in, i bruce lee jab-kick the clutch peddle to the floor... some coordinated time after i felt my left foot begin to make contact with the clutch, i begin to yank the shifter with a "no looking back now" effort (cant afford one of those accidental half shifts) and by the time the shifter is done moving my foot has left the clutch and you usually only heard the rev limit bounce once if at all.

Yes hitting the perfect powershift is great. From years of drag racing it just comes so natural. I will be hitting San Antonio Raceway next month to get some base line runs in.

02-16-2010, 02:19 PM	#61 (permalink)
initialgemini Enthusiast Member Join Date: Mar 2009 Location: Irvine, CA Posts: 340 Drives: 2011 FX 35 Rep Power: 250	What a beautiful Z. __________________ CY 370z \|Sports Package\| Berk CBE\| Berk High Flow Cats (awaiting install)\|BBS LM\|Eibach Pro-Kit Springs\|Stillen Sway Bars\|TWS Shift Knob\|B&M Short Shifter

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02-19-2010, 09:11 AM	#66 (permalink)
Tyrell Tyson Enthusiast Member Join Date: Jan 2010 Location: EU Posts: 295 Drives: P90 TR Rep Power: 15	looks around - Ty