Nissan 370Z Forum - Who's making the move to STU?

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- - Who's making the move to STU? (http://www.the370z.com/track-autocross-drifting-dragstrip/126272-whos-making-move-stu.html)

Quote:

Originally Posted by Brendan (Post 3918300)

$396 per tire lol

Only $21 more per tire and you could be running Hoosiers.

Quote:

Originally Posted by gomer_110 (Post 3918332)

Only $21 more per tire and you could be running Hoosiers.

off topic, but besides hoosiers, which bsp allowance do you think the z34 benefits from the most?

Quote:

Originally Posted by Brendan (Post 3918492)

off topic, but besides hoosiers, which bsp allowance do you think the z34 benefits from the most?

The aero. Until I added aero, I would have sworn there was no way it would make that much of a difference. After adding aero, I wouldn't want to go back. It just keeps the car settled through the higher speed stuff while keeping the car loose enough for slow speed stuff.

Quote:

Originally Posted by Hotrodz (Post 3918034)

I don't auto x but I run 315 square on 18x11 +18 with no modifications. I am lowered as well.

Sent from my SM-G965U using Tapatalk

What kind of front camber is needed to run 18x11 +18?

Quote:

Originally Posted by Mn23 (Post 3921458)

What kind of front camber is needed to run 18x11 +18?

I run -3 to -3.5 with just a little toe and 6.5 caster. If you under -3 run more caster.

Sent from my SM-G965U using Tapatalk

Video from my practice event yesterday. So happy to be back to racing.

Car is driving very nicely with all the changes. With the seat in the car I have enough confidence to put a rear bar back on. We'll see how it goes.

MCS Installed!

Attachment 142604

At first, Vorshlag didn't include an upper perch for my rear divorced spring with my initial MCS package. After a lot of rather unfortunate miscommunication, they are sending a newly designed component, but I'm going to continue to use this SPL version instead. Big shout-out to Turner + crew at SPL for getting their upper perch (usually only sold as part of the midlink kit) to me with overnight shipping -- rather cheaply too.
Attachment 142602
Attachment 142603

Season is off to a good start. I took second by a few tenths at the opener losing to an e92 but beating out a few other well/full prepped examples. Data and video show there was more time out there. Car is driving great but I always say that lol. The longer travel and lower ride feel great. With two events down I feel confident that the seat was the component I was really missing to get the car to another level competitively.

Video attached. Apologies for the sound quality. we'll see if the windslayer helps.

my biggest competition locally is the 2019 spring national winning e46 driven by my buddy but it was sidelined at this event. I hope to have a chance to benchmark soon.

Anyone headed to the Bristol Champ tour? Reg opened today, just signed up.

I think Nationals will be the only travel I get in this year. We may get our champ tour and pro solo back in Colorado if we secure a new site so maybe even lest travel after that.

Is there anyone else trying to make SUR4G (drift compound size 275/40R18) work for AutoX?
I love them on the track, and on the wallet, and don't yet have the budget for a second set of autoX wheels/tires. If I did, A052 no doubt.

They can get competitive if the stars align, otherwise peak grip feels noticeably less than RE's:
-Hot dry day
-Longer faster course
-Codriver
-Short wait between runs

I'm contemplating whether tire blankets would make a significant difference in keeping them up to temp.

I saw people trying them out at the Dixie tour back in the year of their original release, but I don't think I ever heard of the compound beating an equivalent RE-71R. Regardless, the step down from 285 isn't helping so it would have to be a stellar compound to make up for that and I haven't heard that it is (again, secondhand knowledge only).

That said, if your budget is a higher priority than shaving a little time at a national event, that price looks NICE.

revised proposal is out. I'm pretty indifferent about the new cars (no a90 supra) but 315 would be fun.

Quote:

Street Touring Category
#28321 Make STU Great Again!
The STAC is seeking member feedback on a more refined proposal to renew interest in STU and modernize the Street Touring ruleset overall. An initial proposal was published in the April 2020 Fastrack and the STAC has further refined that proposal based on input received. There was generally positive feedback and the STAC hopes that the following revisions will address some of the concerns that were received. The STAC highly encourages individuals to write letters with feedback on the revised proposal.
Changes from the previously published proposal are as follows:
• Restricting AWD and mid/rear-engine cars to 295 tires
• An additional allowance for charge pipe replacement as many cars struggle with charge pipe failure with elevated boost levels
• Clutch allowance is available to all vehicles but requires stock flywheel to keep from being a must-do modification
• Toyota Supra is now on the "maybe one day" list of cars as the STAC felt the performance was too much for the current class
The changes are outlined below:
Wheel and Tire Size Changes
14.3 TIRES
Tires must meet the eligibility requirements of the Street category with the following additional restrictions:
Tires shall have a section width up to and including the following (mm):
STR (AWD), STS .................................................. .............................225
STX (AWD), STH (AWD)............................................. .........................245
STR (2WD)............................................. ...........................................255
STU (AWD & 2WD mid- or rear-engine), STX (2WD), STH (2WD)..............265
STU (AWD & RWD forced induction)........................................ ..........295
STU (RWD N/A & FWD).............................................. ...................315
Intercooler and Charge Pipe Allowance Expansion
14.10.C
1. The air intake system up to, but not including, the engine inlet may be modified or replaced. The engine inlet is the throttle body, carburetor, compressor inlet, or intake manifold, whichever comes first.
SCCA Fastrack News July 2020 Page 3
The existing structure of the car may not be modified for the passage of ducting from the air cleaner to the engine inlet. Holes may be drilled for mounting. Emissions or engine management components in the air intake system, such as a PCV valve or mass airflow sensor, may not be removed, modified, or replaced, and must retain their original function along the flow path.
2. STH only: As utilized only on engines originally equipped with forced induction, induction charge heat exchangers (also known as “intercoolers” or “charge air coolers” [CACs]) are unrestricted in size and shape. Air-to-air CACs and radiators for air-to-liquid CACs must be cooled only by the atmosphere except for standard parts. Body panels, fascias, or structural members may not be cut or altered to facilitate CAC installation. Removal of vehicle components to facilitate installation is not allowed. Holes may be drilled for mounting. Factory boost piping may not be modified or replaced.
3. Charge pipes may be modified or replaced. Replacement charge pipes may delete or block off factory pipes designed to enhance intake sounds (“noisemakers”). Modification or deletion of vehicle components (e.g. plastic shrouds, wheel well liners) to permit routing of alternate charge pipes is not allowed.
Boost Controls Allowance
14.10.C
3. Compressor Bypass Valves (CBVs), blow-off valves, and pop-off valves may be replaced or modified.
4. Boost regulation systems, either electronic or mechanical, and electronic fuel cuts referencing boost pressure may be modified, replaced, or removed. This allowance does not allow for changes to the turbocharger or wastegate.
Clutch Allowance
14.10.O
The clutch disk and pressure plate may be modified or replaced.
Transmission Tuning
14.10.P
The Transmission Control Unit (TCU) may be re-programmed. This allowance only applies to modification of transmission behaviors and does not extend to re-programming any other components.
Electronic Differential Tuning
14.10.Q
Electronic differentials may be re-programmed. This allowance only applies to changing differential behaviors and does not extend to re-programming any other components.
Replacement of Differential in AWD vehicles
14.10.K.2
STU, STR, STX, and STH classes: Only standard (as defined in Section 12) limited slip differentials (LSD) are allowed on AWD vehicles. For AWD vehicles that did not come with any type of limited slip differential (including center differential or transfer case), a single aftermarket mechanical LSD may be added. 2WD vehicles may use any mechanical LSD unit. AWD vehicles may substitute one differential (front, rear, or center) with an aftermarket mechanical LSD.
Appendix A Changes to STU Listings
Audi
RS3
RS4
RS4
BMW
228 (2015-2015) 2 Series (non-M) (2014-2020)
SCCA Fastrack News July 2020 Page 4
M235i (2014-2016)
4 series (non-M) (2014-2020)
3 Series (E9x chassis, NOC inc. M3) (2006-2013)
3 series (non-M) (2014-2020)
M2 (except Performance Edition ZL9) (2016-2018)
M3 (2000-2020)
M4 (2014-2020)
M Coupe (2006-2008)
Ford
Focus RS (2016-2017 2018)
Porsche
Cayman S (981) (2013-2016)

Glad to see the tire changes for mid and rear-engined cars even though I hadn't written a letter yet. Also glad to see the supra out for now, but I still worry a bit about the 981caymans -- perhaps the tire differential will mitigate that. However, I still think all-told this leaves the M2 as too much of a potential overdog. I suppose we'll see - maybe there's no way they can match our tire fitment; the Z does tend to fair pretty well in that regard.