SCCA STR 370z Progress Thread.... It can be done!

MIKE_STR · 10-30-2013, 02:06 PM

Quote:

Originally Posted by 03threefiftyz

I use a Cusco in my BSP car as well. I use Motul fluid and 80% lock. Seems to work well for me...

It honestly might because of the way bigger and stickier tires that you are using. I can't imagine any more lock on street tires though. Even 60% is quite aggressive. I have heard good thing about the motul fluid in the cusco diff. I use the motul 0w40 in my engine...

clintfocus · 10-30-2013, 02:34 PM

i have my Cusco RS also on 80% lock, but with mild ramp up settings, also my clutch plates are WPC friction treated so they engaged smoother. With the narrow tires you run mike and the lower speeds i can see the 60% being ideal. Im a road course guy on 275-285 tires and 10.5 rims so the 80% is pretty damn good. I also use the Motul 75w140 Gear competition fluid

Mike · 10-30-2013, 06:58 PM

Quote:

Originally Posted by MIKE_STR

Full tank? You have to be kidding. Saddle tank or not... that's insane.

He isn't kidding. I'm a track guy, and it always happened around 7/8 of a tank. At Road America at 15/16ths in the carousel.

20 minutes was the longest session I could ever run before phunk's fuel system upgrade. Now I have taken it down to fumes.

Rusty · 10-30-2013, 07:06 PM

Like Mike said about fuel starve. It happened to alot of us.

phunk has a kit to fix this problem.

It's a second pump inside the tank, on the left side. You can look all you want. You can't see it. I have have one myself. Better contact phunk quickly. His second batch maybe sold out.

MIKE_STR · 10-30-2013, 07:49 PM

Quote:

Originally Posted by Rusty

Like Mike said about fuel starve. It happened to alot of us.

phunk has a kit to fix this problem.

It's a second pump inside the tank, on the left side. You can look all you want. You can't see it. I have have one myself. Better contact phunk quickly. His second batch maybe sold out.

Well, that sucks. A second pump or anything in the gas tank is not a legal modification for my class.

Oh well. I have to raise my weight target by 60lbs... I still should be able to get the car down to 3075 with a full tank of gas.

clintfocus · 10-30-2013, 09:07 PM

Quote:

Originally Posted by MIKE_STR

Well, that sucks. A second pump or anything in the gas tank is not a legal modification for my class.

Oh well. I have to raise my weight target by 60lbs... I still should be able to get the car down to 3075 with a full tank of gas.

jesus really? some Auto-x rules are just too nazi

Shamu · 10-30-2013, 09:37 PM

SPC front arm legal? Bushings can't have more metal than stock?

Ideas on improvements. Rather than getting bigger tires why not raise redline to 8000 rpm? You can still grab power up there and gives you a little more top end while keeping low end responsiveness.

Aluminum hat rotors? Huge rotating weight reduction.

clintfocus · 10-30-2013, 10:17 PM

^aint that the truth, the stock rotors are 30lbs O_O

synolimit · 10-30-2013, 10:17 PM

Quote:

Originally Posted by Shamu

Rather than getting bigger tires why not raise redline to 8000 rpm?

Guys with blown oil pumps then motors would probably advise against that.

clintfocus · 10-30-2013, 10:28 PM

id accusump for consistant 8k rpm work, more then that id do a better crank and dry sump knowing the stock crank's weakness at such rpms

MIKE_STR · 10-30-2013, 10:59 PM

Quote:

Originally Posted by Shamu

SPC front arm legal? Bushings can't have more metal than stock?

Ideas on improvements. Rather than getting bigger tires why not raise redline to 8000 rpm? You can still grab power up there and gives you a little more top end while keeping low end responsiveness.

Aluminum hat rotors? Huge rotating weight reduction.

As for the SPC arms, I believe the rule is something like... "the ratio of metal to rubber cannot be greater than stock." The stock arms bushings look like they're the same ratio... although, I haven't done the actual math.

I do plan on getting the Z1 aluminum hat rotors. Those save 10lbs a corner.

I did think about raising the redline. Thoughts on what would be safe? **EDIT** I just read some of the other comments... I'd probably rather not raise the cars redline....

Apollo8642 · 10-31-2013, 11:09 AM

Quote:

Originally Posted by clintfocus

id accusump for consistant 8k rpm work, more then that id do a better crank and dry sump knowing the stock crank's weakness at such rpms

What about the weakness in the VVEL at 8K... Can you swap to the HR heads in STR?

ABQautoxer · 10-31-2013, 11:15 AM

265/40/18 AD08Rs sounds like a better solution and give you about 3mph more than you get now.

MIKE_STR · 10-31-2013, 03:21 PM

Quote:

Originally Posted by ABQautoxer

265/40/18 AD08Rs sounds like a better solution and give you about 3mph more than you get now.

255's are the limit in STR. I'm thinking about the 255/40/18 AD08's.

ABQautoxer · 10-31-2013, 03:35 PM

Doh got the tires sizes for STX and STR mixed up. I did recall the 9" width max.

10-30-2013, 02:34 PM	#17 (permalink)
clintfocus Track Member Join Date: Jan 2011 Location: los angeles Age: 38 Posts: 933 Drives: 370z, EK Civic, F150 Rep Power: 15	i have my Cusco RS also on 80% lock, but with mild ramp up settings, also my clutch plates are WPC friction treated so they engaged smoother. With the narrow tires you run mike and the lower speeds i can see the 60% being ideal. Im a road course guy on 275-285 tires and 10.5 rims so the 80% is pretty damn good. I also use the Motul 75w140 Gear competition fluid Rusty likes this.

10-30-2013, 07:06 PM	#19 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 68 Posts: 34,863 Drives: 2011 Nismo GM 6M Rep Power: 2684436	Like Mike said about fuel starve. It happened to alot of us. phunk has a kit to fix this problem. It's a second pump inside the tank, on the left side. You can look all you want. You can't see it. I have have one myself. Better contact phunk quickly. His second batch maybe sold out. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

10-30-2013, 09:37 PM	#22 (permalink)
Shamu A True Z Fanatic Join Date: Jan 2011 Location: Nor Cal Posts: 1,059 Drives: 370Z Racecar Rep Power: 19	SPC front arm legal? Bushings can't have more metal than stock? Ideas on improvements. Rather than getting bigger tires why not raise redline to 8000 rpm? You can still grab power up there and gives you a little more top end while keeping low end responsiveness. Aluminum hat rotors? Huge rotating weight reduction. __________________ Grant

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10-30-2013, 10:17 PM	#23 (permalink)
clintfocus Track Member Join Date: Jan 2011 Location: los angeles Age: 38 Posts: 933 Drives: 370z, EK Civic, F150 Rep Power: 15	^aint that the truth, the stock rotors are 30lbs O_O

10-30-2013, 10:28 PM	#25 (permalink)
clintfocus Track Member Join Date: Jan 2011 Location: los angeles Age: 38 Posts: 933 Drives: 370z, EK Civic, F150 Rep Power: 15	id accusump for consistant 8k rpm work, more then that id do a better crank and dry sump knowing the stock crank's weakness at such rpms

10-31-2013, 11:15 AM	#28 (permalink)
ABQautoxer Base Member Join Date: Sep 2013 Location: Albuquerque, NM Posts: 11 Drives: 2013 WRX Rep Power: 11	265/40/18 AD08Rs sounds like a better solution and give you about 3mph more than you get now.

10-31-2013, 03:35 PM	#30 (permalink)
ABQautoxer Base Member Join Date: Sep 2013 Location: Albuquerque, NM Posts: 11 Drives: 2013 WRX Rep Power: 11	Doh got the tires sizes for STX and STR mixed up. I did recall the 9" width max.