Yes Another STF BUILD - Mazda3 Forums : The #1 Mazda 3 Forum
Reply
 
LinkBack Thread Tools
post #1 of 17 (permalink) Old 08-07-2013, 11:07 PM Thread Starter
Bicycle Rider
 
Join Date: Aug 2013
Posts: 5
Yes Another STF BUILD

Im looking for some help with my STF build this is my current build im in my 3rd full year of autocross running in the top ten in pax at each event but looking to close the gap on the top 3


Suspension
Mazdaspeed Struts
Koni Yellow Shocks
Mazdaspeed rear sway bar
Stock springs

Tires
Bridgestone Potenza 225/45 front on 17x7.5 45 offset
Hankook Ventus v2 concept 215/45 on stock rims

Engine
K&N drop in air filter

looking for some more bang for my buck due to budget car is very well balanced in the dry as soon as the course gets wet there goes the rear end so any help well be well appreciated
Bumblebee043 is offline  
Sponsored Links
Advertisement
 
post #2 of 17 (permalink) Old 08-08-2013, 01:32 AM
Short Track Racer
 
Join Date: Aug 2007
Location: Sweet Home Alabama
Posts: 176
BFG Rivals or Dunlop Z2 tires will help tremendously. Some front Camber plates will help grip. Soften shocks and swaybar in rear in rain and raise tire pressure to lessen contact point and lessen hydroplaning.

I'm so cone-fused!
solort is offline  
post #3 of 17 (permalink) Old 08-08-2013, 02:18 PM
Grand Am Series
 
PGH Devin's Avatar
 
Join Date: Oct 2012
Location: Pittsburgh, PA
Posts: 390
SRI or CAI to replace the drop-in filter. Noticeable increase in throttle sensitivity. Cheap upgrade.
PGH Devin is offline  
Sponsored Links
Advertisement
 
post #4 of 17 (permalink) Old 08-08-2013, 10:22 PM
Senior Member
 
Join Date: Feb 2012
Location: Dayton, OH
Posts: 722
Quote:
Originally Posted by Bumblebee043 View Post
Im looking for some help with my STF build this is my current build im in my 3rd full year of autocross running in the top ten in pax at each event but looking to close the gap on the top 3


Suspension
Mazdaspeed Struts
Koni Yellow Shocks
Mazdaspeed rear sway bar
Stock springs

Tires
Bridgestone Potenza 225/45 front on 17x7.5 45 offset
Hankook Ventus v2 concept 215/45 on stock rims

Engine
K&N drop in air filter

looking for some more bang for my buck due to budget car is very well balanced in the dry as soon as the course gets wet there goes the rear end so any help well be well appreciated
Tires. Maybe some slightly lower(not much!) and stiffer springs if you feel the need.

What do you have? 2.3 or 2.0?

Quote:
Originally Posted by solort View Post
BFG Rivals or Dunlop Z2 tires will help tremendously. Some front Camber plates will help grip. Soften shocks and swaybar in rear in rain and raise tire pressure to lessen contact point and lessen hydroplaning.
This but include the RS3s and maybe RE11As as well as potential tires. Basically get a known good(for heavier cars... light cars can use the Toyos, heavier cars suck with them for example) tire... unless you're running in Nationals, you will not be outdriven by somebody because you chose the wrong tire(provided you choose one that is near the top). I'm probably going to go for RS3s due to cost and most of our auto-x events are in the summer time when it's HOT. Plus that seems to be the tire to have for heavier cars on the lots that the Cincy SCCA runs at.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

2009 Mazda 3i Touring /// Hawk HPS front pads /// Goodyear Eagle GT 205/50R17 on stock wheels /// Ghetto fabulous filled motor mount

Guinea pig for Dynotronics tuning.
flatlander937 is offline  
post #5 of 17 (permalink) Old 08-08-2013, 11:17 PM
Grand Am Series
 
Join Date: Jul 2012
Location: Rochester, NY
Posts: 496
I'd suggest corksport camber plates if the Mazdaspeed ones don't come with plates.

Get much stiffer springs, but don't lower the ride height more than an inch. Maybe even not that much. If you DD the thing go for the highest rate springs you can stomach, maybe start around 400 lb/in.

More rear sway bar, unless you really go balls out with spring rates. You should do springs before selecting a bar, but I'm guessing the tripoint bar will be ideal.

The other suggestions are dead on. Priority one is to get on some real autocross rubber. I'm on Z2s, but rivals, and re-11a are also great. Rs3 are great in high heat but slightly outdated relative to the newer generation. Really though, any real autocross tire will be a big step up from the potenzas.

I agree with the sri suggestion too, and I'd add that if you want to do a full effort STF build, you can also do headers, exhaust, and get a tune.
ckingsley is offline  
post #6 of 17 (permalink) Old 08-08-2013, 11:56 PM Thread Starter
Bicycle Rider
 
Join Date: Aug 2013
Posts: 5
The potenzas are re070 off an older sti not sure where to go for the springs and I am leaning towards a sri just dependd on the mony come this spring

Sent from AutoGuide.com Free App
Bumblebee043 is offline  
post #7 of 17 (permalink) Old 08-09-2013, 12:30 AM
Grand Am Series
 
Join Date: Jul 2012
Location: Rochester, NY
Posts: 496
I don't know much about the 070. I think it's a half decent summer tire, right? That's good, but no comparison to a real autocross tire.

Lots of people will sell you springs. If you're on coilovers your springs should be standard diameter, so you can get springs of any rate and length from lots of places. I personally would just call tripoint and describe what you want. They sell hypercoils and will help you choose the right length, rate, etc. They are great engineers and really helpful to talk to.
ckingsley is offline  
post #8 of 17 (permalink) Old 08-09-2013, 06:03 PM
Grand Am Series
 
color0's Avatar
 
Join Date: Jan 2013
Location: Pasadena, CA
Posts: 407
If STF allows coilover sleeves/perches you should make it a priority to get them on ASAP. It opens up the possibility of swapping springs in the middle of an event should you need to.

Starting spring rates: 400 lbs/in is a measly 7kg/mm lol, you need something above 8k front/6k rear to curb total weight transfer in steady-state cornering. 9k/7k is probably the lower side of good, I know several time-attack Civics on RS3's that need 10k front springs for the tires' grip. And the Tri-Point bar should be perfect for this application like ckingsley said. On the soft setting with 9/7k springs the rear should come out a little and lock back in effortlessly.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

@bmspec Custom aero/suspension design
color0 is offline  
post #9 of 17 (permalink) Old 08-12-2013, 07:26 PM Thread Starter
Bicycle Rider
 
Join Date: Aug 2013
Posts: 5
Sry for taking so long how for should I go with the spring rates considering im going tovstick with the tire offset that I have

Sent from AutoGuide.com Free App
Bumblebee043 is offline  
post #10 of 17 (permalink) Old 08-12-2013, 07:55 PM
Grand Am Series
 
Join Date: Jul 2012
Location: Rochester, NY
Posts: 496
Quote:
Originally Posted by color0 View Post
I know several time-attack Civics on RS3's that need 10k front springs for the tires' grip.
Those civics have an a-arm suspension. We have struts, so our motion ratio is close to 1. A civic with 10k springs is like a 3 with 5k springs. Of course, we need more than they do because of our camber curve.

400 lbs is a compromise rate that will still be relatively comfortable on the street. More would definitely be better.
ckingsley is offline  
Sponsored Links
Advertisement
 
Reply

  Mazda3 Forums : The #1 Mazda 3 Forum > Technical / Model / Performance > Autocross, Track, and Dyno Results

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Mazda3 Forums : The #1 Mazda 3 Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



  LinkBacks (?)
LinkBack to this Thread: http://www.mazda3forums.com/90-autocross-track-dyno-results/505490-yes-another-stf-build.html
Posted By For Type Date
Autocross, Track, and Dyno Results [Archive] - Mazda3 Forums : The #1 Mazda 3 Forum This thread Refback 09-26-2015 02:31 AM

Similar Threads
Thread Thread Starter Forum Replies Last Post
STF to FSP build Thread Adam3s Autocross, Track, and Dyno Results 836 03-14-2018 06:18 PM
dgross7's STF build thread dgross7 Autocross, Track, and Dyno Results 244 11-10-2017 02:15 PM
STF Build SpeedTheory Autocross, Track, and Dyno Results 7 05-29-2012 10:35 AM
STF Grill EvilGenius 2004-2009 Exterior Modifications 45 07-13-2005 10:42 PM
STF concepts.... hate_romania Mazda3 (Axela) 1 07-08-2005 04:19 PM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome
8