340Whp & @260TQ NISMO

sixpax · 03-13-2012, 07:00 PM

... perhaps you should both head over to the Puffies are OK thread ... calms me down.

Just kidding...so someone posted a 17% loss based on the fact the Z has a shorter and lighter drive shaft than normal RWD cars ? Fact or fiction ?

And just curious, is there anything in the drive train that can change to reduce the loss ?

kcquinn49 · 03-13-2012, 07:10 PM

I remember reading in another thread here, months ago, that someone reduced their rear tire/wheel/rotor combo weight and it showed up as an increase on the dyno. I don't remember the specifics. It could have been a reduction in weight of any of the three.

If this is true then I would love to see the charts, and see the weight drop vs. the increase.

If a lighter weight driveshaft reduces hp loss to the road, then it does seem that lighter weight wheels, tires, and/or rotors would do the same.

sixpax · 03-13-2012, 07:14 PM

Quote:

Originally Posted by kcquinn49

I remember reading in another thread here, months ago, that someone reduced their rear tire/wheel/rotor combo weight and it showed up as an increase on the dyno. I don't remember the specifics. It could have been a reduction in weight of any of the three.

If this is true then I would love to see the charts, and see the weight drop vs. the increase.

If a lighter weight driveshaft reduces hp loss to the road, then it does seem that lighter weight wheels, tires, and/or rotors would do the same.

I have read reduced weight = HP gains, but not sure if that would actually translate to a dyno. Be nice if it did.

kcquinn49 · 03-13-2012, 07:21 PM

From results posted, the reduced weight crankshaft pulley shows up as a gain on the dyno.

And apparently the lighter weight driveshaft does too, if we are indeed around 17% loss vs. 20%. That claim is speculative of course as you can't prove it (unless you would actually change the driveshaft).

So why not for the wheels/tires/rotors?

Here is the part that boggles me. If all four corners are reduced in weight, and you do see a gain at the dyno, would the gain actually be MORE because you can't dyno the front?

If the answer was yes I would be shopping right now for lighter weight tires, rotors, and wheels.

sixpax · 03-13-2012, 07:25 PM

I guess everyone who knows anything left here to go look at Puffies.

I mean if that were true, then guys would be taking the spare tire and everything out to do dyno runs. I'm not so sure it translates to the dyno.

kcquinn49 · 03-13-2012, 07:32 PM

Not the spare tire. The results I've read about but never saw charts to prove, was in reducing the rotational mass of the tires, wheels, rotors, or all.

Just like the rotational mass of the pulley affects the wheel horse power. Peak HP isn't increased, but more is delivered to the wheels (less loss).

kcquinn49 · 03-13-2012, 07:37 PM

I'm in a lease right now, so am looking for ways to deliver more power without serious mods. I don't know if I would have to reduce the mods at the end of my lease, if I don't buy the car.

So far I only have K&N filters and plan to soon buy the post MAF tubes. Not serious mods and easy to reverse if need be.

So reducing rotors and tires would be fine, they are normal wear items. And reducing the wheel weight would also most likely improve the value so that shouldn't be an issue. But I'm only going to do it if there is a noticed improvement.

I've already shopped around and found that I can buy all - new tires, rotors, and wheels - and reduce the rotational mass by over 60 pounds total. I just don't know how that will relate to acceleration improvement.

Now I am guilty of taking this off topic. Sorry. For some reason I felt the need to explain myself. It won't happen again.

sixpax · 03-13-2012, 07:45 PM

Quote:

Originally Posted by kcquinn49

I'm in a lease right now, so am looking for ways to deliver more power without serious mods. I don't know if I would have to reduce the mods at the end of my lease, if I don't buy the car.

So far I only have K&N filters and plan to soon buy the post MAF tubes. Not serious mods and easy to reverse if need be.

So reducing rotors and tires would be fine, they are normal wear items. And reducing the wheel weight would also most likely improve the value so that shouldn't be an issue. But I'm only going to do it if there is a noticed improvement.

I've already shopped around and found that I can buy all - new tires, rotors, and wheels - and reduce the rotational mass by over 60 pounds total. I just don't know how that will relate to acceleration improvement.

Now I am guilty of taking this off topic. Sorry. For some reason I felt the need to explain myself. It won't happen again.

Eh you asked the first question, your thread. I think I read one of the track saavy guys post that every 10 pounds lost equated to 1 HP ... but I could be wrong it was awhile ago I read that, and can't recall what thread it was. If true, dropping 60 is not really going to net you a ton of power. Again I am going from memory, so that could be wrong.

kcquinn49 · 03-13-2012, 07:53 PM

I read that too, Sixpax. It was in the weight reduction thread, which I've read a few times now. It was for overall weight, and is like you said, equivalent to HP gain but not actually a gain.

For rotational mass reduction though, it will also have the equivalent gains due to lower weight, but also - from what I've read - will actually deliver more HP to the wheels. And at a better ratio than 10 to 1. Nobody though has posted before and after numbers. I may have to be the first to try it.

The lightweight pulleys are about 4 pounds less weight and deliver about 5 more HP to the wheels.

sixpax · 03-13-2012, 08:06 PM

Quote:

Originally Posted by kcquinn49

I read that too, Sixpax. It was in the weight reduction thread, which I've read a few times now. It was for overall weight, and is like you said, equivalent to HP gain but not actually a gain.

For rotational mass reduction though, it will also have the equivalent gains due to lower weight, but also - from what I've read - will actually deliver more HP to the wheels. And at a better ratio than 10 to 1. Nobody though has posted before and after numbers. I may have to be the first to try it.

The lightweight pulleys are about 4 pounds less weight and deliver about 5 more HP to the wheels.

My bad ... I finally focused on your "rotational mass" reference ... I was hung up on any weight loss ... seems easy to test if you dyno with the rear wheels you have, and then slap some lighter ones on.

Cmike2780 · 03-13-2012, 08:48 PM

AlphaSnacks · 03-13-2012, 08:52 PM

-_-

stfu everyone!

Sibze · 03-13-2012, 10:17 PM

Quote:

Originally Posted by Arnold K.

-_-

stfu everyone!

... well that isn't very nice

Z eliminator · 03-14-2012, 06:34 PM

Sibze. good to see your still here.
you shold tell these guys how my car runs on 309 rwhp.
we are going to go low 11's with the SC.

steve

03-13-2012, 08:48 PM	#11 (permalink)
Cmike2780 A True Z Fanatic Join Date: Jun 2010 Location: Long Island Posts: 5,059 Drives: slowwww Rep Power: 31	__________________ [09][MB][6-Spd MT][Touring][Stillen Gen III][K&N][Borla CBE][Evo-R] [ArchitTEK Photography]

03-14-2012, 06:34 PM	#14 (permalink)
Z eliminator A True Z Fanatic Join Date: Jul 2009 Location: Ontario Canada Posts: 1,660 Drives: 370 Z 7AT Sports Rep Power: 20	Sibze. good to see your still here. you shold tell these guys how my car runs on 309 rwhp. we are going to go low 11's with the SC. steve __________________ 12.343 @114.14 . 4.5 stroker motor is now being built. Dec 1 2015.

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03-13-2012, 07:10 PM	#2 (permalink)
kcquinn49 Base Member Join Date: Dec 2011 Location: Indiana Posts: 86 Drives: 2011 370Z Coupe Rep Power: 251	I remember reading in another thread here, months ago, that someone reduced their rear tire/wheel/rotor combo weight and it showed up as an increase on the dyno. I don't remember the specifics. It could have been a reduction in weight of any of the three. If this is true then I would love to see the charts, and see the weight drop vs. the increase. If a lighter weight driveshaft reduces hp loss to the road, then it does seem that lighter weight wheels, tires, and/or rotors would do the same.

03-13-2012, 07:21 PM	#4 (permalink)
kcquinn49 Base Member Join Date: Dec 2011 Location: Indiana Posts: 86 Drives: 2011 370Z Coupe Rep Power: 251	From results posted, the reduced weight crankshaft pulley shows up as a gain on the dyno. And apparently the lighter weight driveshaft does too, if we are indeed around 17% loss vs. 20%. That claim is speculative of course as you can't prove it (unless you would actually change the driveshaft). So why not for the wheels/tires/rotors? Here is the part that boggles me. If all four corners are reduced in weight, and you do see a gain at the dyno, would the gain actually be MORE because you can't dyno the front? If the answer was yes I would be shopping right now for lighter weight tires, rotors, and wheels.

03-13-2012, 07:32 PM	#6 (permalink)
kcquinn49 Base Member Join Date: Dec 2011 Location: Indiana Posts: 86 Drives: 2011 370Z Coupe Rep Power: 251	Not the spare tire. The results I've read about but never saw charts to prove, was in reducing the rotational mass of the tires, wheels, rotors, or all. Just like the rotational mass of the pulley affects the wheel horse power. Peak HP isn't increased, but more is delivered to the wheels (less loss).

03-13-2012, 07:37 PM	#7 (permalink)
kcquinn49 Base Member Join Date: Dec 2011 Location: Indiana Posts: 86 Drives: 2011 370Z Coupe Rep Power: 251	I'm in a lease right now, so am looking for ways to deliver more power without serious mods. I don't know if I would have to reduce the mods at the end of my lease, if I don't buy the car. So far I only have K&N filters and plan to soon buy the post MAF tubes. Not serious mods and easy to reverse if need be. So reducing rotors and tires would be fine, they are normal wear items. And reducing the wheel weight would also most likely improve the value so that shouldn't be an issue. But I'm only going to do it if there is a noticed improvement. I've already shopped around and found that I can buy all - new tires, rotors, and wheels - and reduce the rotational mass by over 60 pounds total. I just don't know how that will relate to acceleration improvement. Now I am guilty of taking this off topic. Sorry. For some reason I felt the need to explain myself. It won't happen again.

03-13-2012, 07:53 PM	#9 (permalink)
kcquinn49 Base Member Join Date: Dec 2011 Location: Indiana Posts: 86 Drives: 2011 370Z Coupe Rep Power: 251	I read that too, Sixpax. It was in the weight reduction thread, which I've read a few times now. It was for overall weight, and is like you said, equivalent to HP gain but not actually a gain. For rotational mass reduction though, it will also have the equivalent gains due to lower weight, but also - from what I've read - will actually deliver more HP to the wheels. And at a better ratio than 10 to 1. Nobody though has posted before and after numbers. I may have to be the first to try it. The lightweight pulleys are about 4 pounds less weight and deliver about 5 more HP to the wheels.

03-13-2012, 08:52 PM	#12 (permalink)
AlphaSnacks A True Z Fanatic Join Date: Jan 2010 Location: Windermere, FL Posts: 1,618 Drives: '13 XKR-S, '10 370Z Rep Power: 20	-_- stfu everyone!