The Official 370Z Autocross Thread

[cjwsrt6]

Anybody ever run 275/40/18 I found some cheap and won't run them but twice or so

[xxAGAVExx]

I've kinda asked this question before, but I'm getting ready to pull the trigger on some new rims. Should I go 275/35/19 front 305/30/19 rears or try 305/30/19 all around. Either staggered nismo rims or rears all around. Planning to eventually go FI so I want 305s in the rear.


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[gomer_110]

Originally Posted by xxAGAVExx

I've kinda asked this question before, but I'm getting ready to pull the trigger on some new rims. Should I go 275/35/19 front 305/30/19 rears or try 305/30/19 all around. Either staggered nismo rims or rears all around. Planning to eventually go FI so I want 305s in the rear.


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More tire = More better. 315's or wider all around.

[cjwsrt6]

If you're modded is go 285/35 and 325/30 on nismo wheels. Get as much/sticky tire as you can get.. I run a stock class so I have to be within stock wheel specs

[xxAGAVExx]

Thanks, now I just need to figure out if the Nismo rear rims with 305s will fit on the front and not rub, I have carbon fiber fenders so I can't pull them


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[cjwsrt6]

Check the tire section, there's a guy running 285 up front and he's got a bunch of pictures. I don't think you'd want much wider.. 295/30/19 fit on stock wheels with Hoosiers so they may work

[gomer_110]

315/30-18's on 18x10's will fit up front.

[xxAGAVExx]

Originally Posted by gomer_110

315/30-18's on 18x10's will fit up front.

Is that what u are running? What kind of tires in 315, I want to get re71s, but they don't make them in that size


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[gomer_110]

I'm running Hoosier A7's in ASP.

[xxAGAVExx]

Gotcha, that makes sense then.


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[Brendan]

Let my buddy drive my z at a bmwcca event. Looks like I've got a co driver for next season.

_DSC0532 by brendan sobers, on Flickr

[j-rho]

For anybody looking to modify their car from stock to ST or SP or SSM, I've got most of the parts you need, all of them barely used:
PPE headers, high-end suspension, Takeda cold air, and more

Shameless plug for the car too: 2014 370z sport, now stock-ish, $23,500 OBO

[gomer_110]

For those of you that are trying to get the 370Z moved from STR to STU and haven't heard about the new push to open up boost limits in the ST classes, you might want to start writing your letters opposing it now.

Long story short, since it's not possible to verify the boosted cars aren't altering their boost control via ecu tuning there is a big push to allow open boost for the turbo cars in the ST classes. If this goes through you'll end up with STU being spec boost buggies which obviously would hurt the 370Z if it ever gets moved there.

[Brendan]

Originally Posted by gomer_110

For those of you that are trying to get the 370Z moved from STR to STU and haven't heard about the new push to open up boost limits in the ST classes, you might want to start writing your letters opposing it now.

Long story short, since it's not possible to verify the boosted cars aren't altering their boost control via ecu tuning there is a big push to allow open boost for the turbo cars in the ST classes. If this goes through you'll end up with STU being spec boost buggies which obviously would hurt the 370Z if it ever gets moved there.

How do you feel about the notion that allowing them to increase boost without allowing them to increase injector or tire size wont net them enough of a benefit? I spoke to a local stu competitor who estimates he will only be able to get an extra 15 hp unless he is allowed to supporting fuel mods.

[gomer_110]

Originally Posted by Brendan

How do you feel about the notion that allowing them to increase boost without allowing them to increase injector or tire size wont net them enough of a benefit? I spoke to a local stu competitor who estimates he will only be able to get an extra 15 hp unless he is allowed to supporting fuel mods.

Was talking to a past STU national champ out at nationals who's familiar with both the boost buggies. According to what he was saying, the STI won't gain much but the Evo's will gain quite a bit. This was based on him tuning a STU Evo at one point and then for grins playing with the boost tables to see the difference.

The other thing to consider is the area under the curve. Just because the car doesn't have huge gains up top doesn't mean the usable power and torque don't increase dramatically.