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

MIKE_STR · 03-12-2015, 11:23 PM

Quote:

Originally Posted by takjak2

You mean the brakes are excellent and the STR [strike]tires[/strike] class arent suitable for the weight of the car.

What happened to your ABS?

I'm sure it could be a tire/grip issue. However, the cars dont seem to have this problem in stock trim.

The abs works fine most of the time. Just every once in awhile... randomly, they'd lock. I tried multiple compounds and made sure everything was clean and we'll maintained... no idea what caused it.

Trust me, I did tons of research. Any course that required a brake stomp would make me super timid.

gomer_110 · 03-13-2015, 07:44 AM

Quote:

Originally Posted by 14BlackCherry

End links can be spherical in street class. There's no rules on those. However actual suspension like control arms etc cannot use spherical bushings unless it came from Nissan that way. I use SPL end links in street class.

Yes you are correct, I should have been more specific. Actually my SPL end links for up front just showed up a few days ago.

j-rho · 03-31-2015, 12:36 PM

Second place at the ET Pro. Still plenty to do to get the car dialed in, and myself dialed in to it-
SD Tour and ET Pro 2015 « J-Rho's '67 Camaro Z28 STX build

AK370Z · 04-02-2015, 12:34 PM

awesome driving. Balance of the car seems really good. It seems like car has a much better control during over steer vs. street class 370Z.. It seemed like more easy to control vs the snappy oversteer in stock/street form. Can't wait to see how it does next!!!

BryanH · 04-14-2015, 01:09 AM

I think the improved LSD in Jason's car has quite a bit to do with toning down the snap of the oversteer.

j-rho · 04-14-2015, 03:10 AM

In Street trim I was pretty happy with the balance. Ran Hankook RS3v2 front, v1 rear. The v2s were fine at room temp, the v1s needed heat - so the car would go from loose to understeer over the course of a run. That's some of what you see in my Street-class videos from last year - that, and I had just bought the car and was still getting used to it. Having a 305 out back sure was sweet!

Now in STR am down to 255s (245s at the Pro, all I could get in the Bridgestones). In San Diego things were a mess. Some of that was the surface, some was the tires, a lot was the driver, but the setup was off too. I think the car was pushing a ton on entry, which I wasn't picking up on. I was over-turning the wheel, so the car would quickly get loose on the power. The move to better tires and a better surface helped a lot between SD and the ET Pro, but so did changing the setup to something more neutral.
For the next event I plan to stiffen the rear bar (to free it up in steady-state) stiffen rear bump and rebound (to help liven it up a bit in transition and entry) soften front bump (try to keep from overloading the front tires on entry and getting into a push) and stiffen front rebound (to keep the transitionnal balance from getting out of hand). Spring rates will be leaving alone at 1100front, 700rear.
The quaife has been great thus far. A clutch type would only be making the problems I'm already dealing with, worse - even if it might be the slightly faster ultimate solution. The big front bar in street cut down most of the inside wheelspin, but even in a non-wheelspin situation, there is definitely something to be said for how a real diff distributes torque, vs a viscous or open diff.

Also have a couple electronics tweaks in mind which I believe should improve the car's lift throttle and trail-braking behavior.

j-rho · 05-18-2015, 01:01 PM

PPE long tube headers installed, bit of work involved...:
PPE Long-Tube Header install « J-Rho's '67 Camaro Z28 STX build

03-31-2015, 12:36 PM	#198 (permalink)
j-rho Base Member Join Date: Jul 2014 Location: San Diego Posts: 154 Drives: 1967 Camaro Z28 Rep Power: 11	Second place at the ET Pro. Still plenty to do to get the car dialed in, and myself dialed in to it- SD Tour and ET Pro 2015 « J-Rho's '67 Camaro Z28 STX build AK370Z, Mandingo, zpower86 and 2 others like this.

04-02-2015, 12:34 PM	#199 (permalink)
AK370Z Administrator Join Date: Sep 2008 Location: NJ Posts: 9,930 Drives: 09 370Z MB Sports M6 Rep Power: 10	awesome driving. Balance of the car seems really good. It seems like car has a much better control during over steer vs. street class 370Z.. It seemed like more easy to control vs the snappy oversteer in stock/street form. Can't wait to see how it does next!!! __________________ The370Z Signature Pictures ll Want to rock our forum decals on your car? Then click here! ll How to Embed YouTube Videos In a Post STOP! (Hammertime) ll Become a Premium Member Click HERE ll F.A.Q. Are You a Nissan Dealer? Click Here to Become A "Supporting Dealer" and Start Listing Your 370Zs In Our Inventory Section My Monterey Blue Z ll My Exhaust --> My Intake --> G3 Nissan's Official Response Regarding Oil Temp Issue: CLICK HERE Need a Set of Cheap Winter wheels /Tires? Then Visit The Banner Link Below and Place Your Order. You'll Help Keep The370Z Alive.

05-18-2015, 01:01 PM	#202 (permalink)
j-rho Base Member Join Date: Jul 2014 Location: San Diego Posts: 154 Drives: 1967 Camaro Z28 Rep Power: 11	PPE long tube headers installed, bit of work involved...: PPE Long-Tube Header install « J-Rho's '67 Camaro Z28 STX build carlitos_370z likes this.

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04-14-2015, 01:09 AM	#200 (permalink)
BryanH Base Member Join Date: Jun 2012 Location: California Posts: 5 Drives: NISMO 370Z RC Rep Power: 13	I think the improved LSD in Jason's car has quite a bit to do with toning down the snap of the oversteer.

04-14-2015, 03:10 AM	#201 (permalink)
j-rho Base Member Join Date: Jul 2014 Location: San Diego Posts: 154 Drives: 1967 Camaro Z28 Rep Power: 11	In Street trim I was pretty happy with the balance. Ran Hankook RS3v2 front, v1 rear. The v2s were fine at room temp, the v1s needed heat - so the car would go from loose to understeer over the course of a run. That's some of what you see in my Street-class videos from last year - that, and I had just bought the car and was still getting used to it. Having a 305 out back sure was sweet! Now in STR am down to 255s (245s at the Pro, all I could get in the Bridgestones). In San Diego things were a mess. Some of that was the surface, some was the tires, a lot was the driver, but the setup was off too. I think the car was pushing a ton on entry, which I wasn't picking up on. I was over-turning the wheel, so the car would quickly get loose on the power. The move to better tires and a better surface helped a lot between SD and the ET Pro, but so did changing the setup to something more neutral. For the next event I plan to stiffen the rear bar (to free it up in steady-state) stiffen rear bump and rebound (to help liven it up a bit in transition and entry) soften front bump (try to keep from overloading the front tires on entry and getting into a push) and stiffen front rebound (to keep the transitionnal balance from getting out of hand). Spring rates will be leaving alone at 1100front, 700rear. The quaife has been great thus far. A clutch type would only be making the problems I'm already dealing with, worse - even if it might be the slightly faster ultimate solution. The big front bar in street cut down most of the inside wheelspin, but even in a non-wheelspin situation, there is definitely something to be said for how a real diff distributes torque, vs a viscous or open diff. Also have a couple electronics tweaks in mind which I believe should improve the car's lift throttle and trail-braking behavior.