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

MIKE_STR · 10-29-2013, 09:33 PM

Quote:

Originally Posted by mdxj

I was thinking of going with cusco for mine since I am open right now.

It's a quality product. Don't set it any higher than 60% and don't use anything but Royal Purple or Motorcraft with enough friction modifier in it. I used redline 75w90 and 75w140 for awhile... The built in friction modifier was not nearly enough and I blame the redline fluid for most of my diff woes...

mdxj · 10-29-2013, 10:27 PM

Good to know. I have been researching settings for it. I am in ASP right now.

03threefiftyz · 10-30-2013, 09:37 AM

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

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

clintfocus · 10-30-2013, 10:17 PM

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

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

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.

SPOHN · 10-31-2013, 03:58 PM

So with 18k Front / 14k Rear you feel a lot better about those? I'm thinking of going up that high also on my next set. Just not sure how higher spring rates will be on my car that is so light as is. But even then our cars have a lot of weight up front as is.

Great write up.

MIKE_STR · 11-04-2013, 11:13 PM

Quote:

Originally Posted by SPOHN

So with 18k Front / 14k Rear you feel a lot better about those? I'm thinking of going up that high also on my next set. Just not sure how higher spring rates will be on my car that is so light as is. But even then our cars have a lot of weight up front as is.

Great write up.

Yeah, it seems to work ok with the current sway bar setup.

They feel loads better than my previous KW V3's... way better. The car just feels so much more nimble.

Next spring I am going to try 18k front and 16k rear though. However, I'll try it without a rear sway bar. The goal is to increase grip on corner exit... there is still a lot of tuning to be done.

Apollo8642 · 11-05-2013, 10:43 AM

Mike_STR, this might have come up, but are you scaling your car?

03threefiftyz · 11-06-2013, 03:23 PM

If you are trying to increase grip on corner exit....going up in rear spring is not going to help. Do you have a rear sway on the car? If so, yank it and toss it away.

10-29-2013, 10:27 PM	#2 (permalink)
mdxj Enthusiast Member Join Date: Nov 2011 Location: OKC Posts: 290 Drives: 09 Nismo, 98 Jeep XJ Rep Power: 14	Good to know. I have been researching settings for it. I am in ASP right now. Footloose301 likes this. __________________ '09 370 base - RIP '09 370 Nismo - New track car

10-30-2013, 02:34 PM	#5 (permalink)
clintfocus Track Member Join Date: Jan 2011 Location: los angeles Age: 39 Posts: 933 Drives: 370z, EK Civic, F150 Rep Power: 16	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.

10-31-2013, 03:58 PM	#12 (permalink)
SPOHN A True Z Fanatic Join Date: Feb 2010 Location: Covington, GA Age: 46 Posts: 14,844 Drives: Waiting on next Z Rep Power: 222	So with 18k Front / 14k Rear you feel a lot better about those? I'm thinking of going up that high also on my next set. Just not sure how higher spring rates will be on my car that is so light as is. But even then our cars have a lot of weight up front as is. Great write up. __________________

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10-30-2013, 09:37 AM	#3 (permalink)
03threefiftyz Track Member Join Date: Apr 2010 Location: MD Posts: 536 Drives: 03 350z 6mt Rep Power: 17	I use a Cusco in my BSP car as well. I use Motul fluid and 80% lock. Seems to work well for me...

10-30-2013, 10:17 PM	#6 (permalink)
clintfocus Track Member Join Date: Jan 2011 Location: los angeles Age: 39 Posts: 933 Drives: 370z, EK Civic, F150 Rep Power: 16	^aint that the truth, the stock rotors are 30lbs O_O

10-30-2013, 10:28 PM	#7 (permalink)
clintfocus Track Member Join Date: Jan 2011 Location: los angeles Age: 39 Posts: 933 Drives: 370z, EK Civic, F150 Rep Power: 16	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	#9 (permalink)
ABQautoxer Base Member Join Date: Sep 2013 Location: Albuquerque, NM Posts: 11 Drives: 2013 WRX Rep Power: 12	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	#11 (permalink)
ABQautoxer Base Member Join Date: Sep 2013 Location: Albuquerque, NM Posts: 11 Drives: 2013 WRX Rep Power: 12	Doh got the tires sizes for STX and STR mixed up. I did recall the 9" width max.

11-05-2013, 10:43 AM	#14 (permalink)
Apollo8642 Base Member Join Date: Feb 2012 Location: Oregon Posts: 187 Drives: 09 370Z Nismo #280 Rep Power: 14	Mike_STR, this might have come up, but are you scaling your car?

11-06-2013, 03:23 PM	#15 (permalink)
03threefiftyz Track Member Join Date: Apr 2010 Location: MD Posts: 536 Drives: 03 350z 6mt Rep Power: 17	If you are trying to increase grip on corner exit....going up in rear spring is not going to help. Do you have a rear sway on the car? If so, yank it and toss it away.