How to add traction in 30 minutes or less *Approved*

*AceInHole* · 02-27-2007, 08:58 AM

So, I have wheels that are the wrong offset. They're 18x12 with 6.75" backspacing, but I really need 8" backspacing. This means the wheels stick out slightly, in addition to having a massive overall rolling diameter. With the Georgia SCCA Tour event this weekend, I needed a quick fix.

So, sawzall in hand, I went outside to f(*&# some s*(& up.

The first step is to plan something. I think I ignored this step on the driver's side, but that's half of why I'm writing this: so you guys don't mess up (because I care. I really do). I traced an outline of what I wanted (dirt and grime makes for an easy sketch) and went to work. For the fender cut, you want to take only the outer fender skin after your initial notch.

The next cut should be right along the lip of the fender on the inside (tub) section, so that you end up with as much of the tub as possible. I then cut slots into the tub section so I could hammer it up:

Ignore the bad cut. It'll be covered later, if and when you get real flares or an overfender. Just make sure that you've got room for your tires. Not cutting into tires that cost some $300 each would be a good thing, and with the massive overall diameter, you'll need clearance to get the car down to a proper ride height. Once it's all clear, hammer it up a bit more since bumps and suspension joint-flex may bring the tire up higher than a jack will. After that, weld or rivet the inner fender back to the outer fender skin. Here's where the debate comes into play: people say that the outer fender is structural, and people say it isn't. I'd rather be safe than sorry, so mine is welded up, and filled in with window sealant.

Once that's accomplished, undo the shock mount and mount your wheel. Use a jack to bring the wheel up to where you think your suspension might go. After that, set the fender lip to where you want it (ideally clearing the tire) and tack it in place a few times.

This is completely an un-necessary step if you're going to add a fender flare or over-fender. I just did it because I didn't have a fender flare or over-fender at the time, and really, who cares how it looks if it's not going fast? For now I didn't want a jagged edge on the side of the car. I suppose it wouldn't look horrible if I had panel bonded the wheel arch back on, and molded stuff in place, but it's all coming off for 50mm over-fenders.

The final step is to proceed to stomp cones:

-PJ

S13FREEAAK · 02-27-2007, 09:45 AM

Looks good and functional. How did the new tire/wheel setup feel?

*AceInHole* · 02-27-2007, 10:07 AM

Quote:

Originally Posted by S13FREEAAK

Looks good and functional. How did the new tire/wheel setup feel?

At first it felt as though there was too much tire in back, especially on lower speed corner entry. Once the tires were scrubbed in, though, they felt great. The car is still a bit twitchy through the higher speed stuff, so I'm hoping newer/ better shocks will help keep the rear end in check. I definitely need to modify the roll centers, though, as I'm still getting a hint of inside rear tire lift on sweepers. Raising the front roll-center should negate that, much like the BMW's, which lift the inside front.

For the record:
the tires shown are Kumho V710, 285/30/R18 up front and 315/35/R18 in back. They sit on 18x10 +11 up front, and 18x12 with 6.75" backspacing in the rear, for wheels.

***ThatGuy*** · 02-27-2007, 10:09 AM

You're crazy, and I love it! Keep up the good work.

S13FREEAAK · 02-27-2007, 10:20 AM

Quote:

Originally Posted by AceInHole

For the record:
the tires shown are Kumho V710, 285/30/R18 up front and 315/35/R18 in back. They sit on 18x10 +11 up front, and 18x12 with 6.75" backspacing in the rear, for wheels.

Do they make a 315/30/18 or something like that? 315/35/18 seems really tall.

LB.Motoring · 02-27-2007, 10:25 AM

nice haha I know the feeling,

That was my last weekend

*kouki_s14* · 03-08-2007, 08:23 PM

how much did you get those ccws for?

*theicecreamdan* · 03-12-2007, 01:40 PM

I want to see more pictures of the car on the ground with those tires now.

*HaLo* · 03-12-2007, 09:46 PM

Quote:

Originally Posted by AceInHole

At first it felt as though there was too much tire in back, especially on lower speed corner entry. Once the tires were scrubbed in, though, they felt great. The car is still a bit twitchy through the higher speed stuff, so I'm hoping newer/ better shocks will help keep the rear end in check. I definitely need to modify the roll centers, though, as I'm still getting a hint of inside rear tire lift on sweepers. Raising the front roll-center should negate that, much like the BMW's, which lift the inside front.

For the record:
the tires shown are Kumho V710, 285/30/R18 up front and 315/35/R18 in back. They sit on 18x10 +11 up front, and 18x12 with 6.75" backspacing in the rear, for wheels.

Well, that will surely put to shame my 275/40R17 Hoosiers all-around..

SiI40sx · 03-13-2007, 07:10 PM

Quote:

Originally Posted by kouki_s14

how much did you get those ccws for?

Seriously, those rims cost more than most s13's. Sexy time!

*AceInHole* · 03-14-2007, 11:45 AM

Quote:

Originally Posted by HaLo

Well, that will surely put to shame my 275/40R17 Hoosiers all-around..

Well, I think Daddio is running 285/30/R18 all around on his Evo, which is surprizing since I bought the 18x12" CCW's from a BSP Evo guy. You'll be able to get heat into your tires a lot easier than I will, untill I'm hitting the 400-500rwhp mark. Unfortunately, I don't have the suspension to really plant the rear down, just yet. Looking at Stance GR3's or stepping it up to Moton's. I also want to raise the front roll-center to get the rear to plant a bit more when the body rolls. Hopefully it won't kill my turn-in characteristics, which at the moment leads to mild understeer. Not to mention my car is a heavy pig with the stock sheet metal!

*HaLo* · 03-14-2007, 11:49 AM

PJ!! You're not even using the whole tire...

*240trainee* · 03-14-2007, 12:44 PM

damn those are some meats, lol

You should get some bolt on fender flares off a z car or something, would at least clean it up alittle.

*AceInHole* · 03-14-2007, 01:13 PM

Quote:

Originally Posted by HaLo

PJ!! You're not even using the whole tire...

That was during the test and tune. We dropped like 7psi from there by the end of the weekend, and were getting further onto the shoulders.

I'm probably gonna do custom fenders, since I can get some good one-off fiberglass work done. Flares or over-fenders aren't really my style.

*kouki_s14* · 03-14-2007, 04:22 PM

so how much did the ccw's cost you??

*AceInHole* · 03-15-2007, 12:42 PM

I bought them used for $1200, IIRC.

**mrmephistopheles** · 03-26-2007, 06:34 AM

Approved

It's a little 'out there' and doesn't cover the fender modding 95% of people will be doing, but fuck it, it is what it is.

02-27-2007, 08:58 AM	#1 (permalink)
AceInHole Autox Technician Join Date: Dec 2001 Location: New Haven, CT Age: 27 Posts: 3,944 Trader Rating: (0) Rides Gallery: AceInHole	How to add traction in 30 minutes or less Approved So, I have wheels that are the wrong offset. They're 18x12 with 6.75" backspacing, but I really need 8" backspacing. This means the wheels stick out slightly, in addition to having a massive overall rolling diameter. With the Georgia SCCA Tour event this weekend, I needed a quick fix. So, sawzall in hand, I went outside to f(&# some s(& up. The first step is to plan something. I think I ignored this step on the driver's side, but that's half of why I'm writing this: so you guys don't mess up (because I care. I really do). I traced an outline of what I wanted (dirt and grime makes for an easy sketch) and went to work. For the fender cut, you want to take only the outer fender skin after your initial notch. The next cut should be right along the lip of the fender on the inside (tub) section, so that you end up with as much of the tub as possible. I then cut slots into the tub section so I could hammer it up: Ignore the bad cut. It'll be covered later, if and when you get real flares or an overfender. Just make sure that you've got room for your tires. Not cutting into tires that cost some $300 each would be a good thing, and with the massive overall diameter, you'll need clearance to get the car down to a proper ride height. Once it's all clear, hammer it up a bit more since bumps and suspension joint-flex may bring the tire up higher than a jack will. After that, weld or rivet the inner fender back to the outer fender skin. Here's where the debate comes into play: people say that the outer fender is structural, and people say it isn't. I'd rather be safe than sorry, so mine is welded up, and filled in with window sealant. Once that's accomplished, undo the shock mount and mount your wheel. Use a jack to bring the wheel up to where you think your suspension might go. After that, set the fender lip to where you want it (ideally clearing the tire) and tack it in place a few times. This is completely an un-necessary step if you're going to add a fender flare or over-fender. I just did it because I didn't have a fender flare or over-fender at the time, and really, who cares how it looks if it's not going fast? For now I didn't want a jagged edge on the side of the car. I suppose it wouldn't look horrible if I had panel bonded the wheel arch back on, and molded stuff in place, but it's all coming off for 50mm over-fenders. The final step is to proceed to stomp cones: -PJ __________________ www.soundworksinc.net

02-27-2007, 09:45 AM	#2 (permalink)
S13FREEAAK Drifterella Join Date: Apr 2002 Location: Iowa Posts: 2,194 Trader Rating: (4) Rides Gallery: S13FREEAAK	Looks good and functional. How did the new tire/wheel setup feel? __________________ www.DPIstore.net AIM: DPIstore Joe@DPIstore.net FREE SHIPPING on all purchases over $75 made through our online store NRG STUFF ON SALE, ALL DAY EVERY DAY! PM ME FOR PRICES. Stickers! Drifterella, Fat Trucker Girl, FAIL!, Dumpster Spec Bling Blau, Get it Now Prosport Performance MegaSale - Gauges start at $35, Oil coolers, Heat Wrap, and more!

02-27-2007, 10:09 AM	#4 (permalink)
*ThatGuy* Moderator you hate Join Date: Mar 2002 Location: MCAS New River, NC Age: 29 Posts: 13,558 Trader Rating: (0) Rides Gallery: ThatGuy	You're crazy, and I love it! Keep up the good work. __________________ YES, I have a 240sx. NO, it doesn't have an SR. NO, I don't drift. NO, it's not for sale! STOP BUYING KNOCK-OFFS!!

02-27-2007, 10:25 AM	#6 (permalink)
LB.Motoring Post Whore! Join Date: Jul 2006 Location: SòCal♥ Cali, U.K =/==> I rule your face, So Anyways..... www.myspace.com/myspacerobby :) Duh. Age: 22 Posts: 5,584 Trader Rating: (0) Rides Gallery: LB.Motoring	nice haha I know the feeling, That was my last weekend __________________ OConnellparts.blogspot.com <--Porsche parts 4 Sale Robby Leuer

03-08-2007, 08:23 PM	#7 (permalink)
kouki_s14 i'm addicted to the track... Join Date: Jan 2004 Location: Los Angeles Posts: 1,560 Trader Rating: (0)	how much did you get those ccws for? __________________ I'm amazed at how many people are idiots.

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03-14-2007, 11:49 AM	#12 (permalink)
HaLo from Canada, eh! Join Date: Sep 2001 Location: Montreal, Quebec Age: 30 Posts: 5,220 Trader Rating: (0) Rides Gallery: HaLo	PJ!! You're not even using the whole tire... __________________ -> HaLo All-around fun car: 01 GPW Honda S2000 -> stock Daily Driver: 2006 Dark Blue Civic DX-G w/Nothing PARTED: 93 Pearl White 240SX LE Fastback w/SR20DET SOLD: 93 Super White 240SX SE Convertible w/Silvia Front

03-14-2007, 12:44 PM	#13 (permalink)
240trainee TEAM PTERO!!!1!!1!! Join Date: Jun 2003 Location: Richmond, VA Age: 21 Posts: 3,705 Trader Rating: (0)	damn those are some meats, lol You should get some bolt on fender flares off a z car or something, would at least clean it up alittle. __________________ Team Pterodactyl SHARK ATTACK!!! LookoutDrift

03-14-2007, 04:22 PM	#15 (permalink)
kouki_s14 i'm addicted to the track... Join Date: Jan 2004 Location: Los Angeles Posts: 1,560 Trader Rating: (0)	so how much did the ccw's cost you?? __________________ I'm amazed at how many people are idiots.

03-15-2007, 12:42 PM	#16 (permalink)
AceInHole Autox Technician Join Date: Dec 2001 Location: New Haven, CT Age: 27 Posts: 3,944 Trader Rating: (0) Rides Gallery: AceInHole	I bought them used for $1200, IIRC. __________________ www.soundworksinc.net

03-26-2007, 06:34 AM	#17 (permalink)
mrmephistopheles No time for the jibba-jabba! Join Date: Mar 2002 Location: BFE Age: 6 Posts: 13,054 Trader Rating: (3) Rides Gallery: mrmephistopheles	Approved It's a little 'out there' and doesn't cover the fender modding 95% of people will be doing, but fuck it, it is what it is. __________________

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