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-   Autocross, Track, and Dyno Results (http://www.mazda3forums.com/forumdisplay.php?f=90)
-   -   dgross7's STF build thread (http://www.mazda3forums.com/showthread.php?t=494338)

dgross7 07-15-2013 10:45 PM

dgross7's STF build thread
 
http://i1231.photobucket.com/albums/...psiuvkkqnb.jpg

http://i1231.photobucket.com/albums/...psklybnmtf.jpg

http://i1231.photobucket.com/albums/...ps0k8dexaw.jpg

Using this thread to document/share my progress both as a driver and of my car.

Improvements to date:

Chassis
Koni 8611-1256 race inserts
Corksport plates
Hypercoil 400f/650r
Goodridge ss lines
SPC rear arms
EBC yellowstuff
Tripoint RSB
AWR endlinks

Engine
Mazdaspeed CAI
Vibrant Headers/HFC
Racing Beat exhaust
SU trans mount
cp-e passenger motor mount 60 duro
cp-e rear motor mount 65 duro

Wheel & Tire
Rota Slipstream 15x7.5
205/50/15 RE-71r

O.Z. Alleggerita 17x7.5
225/45/17 Michelin PSS (travel tires)

dgross7 07-15-2013 10:50 PM

Just last week I purchased the speed3 brakes from a fellow member.

Weird thing I realized and I want to say I remember reading it somewhere but haven't been able to find it. Notice the dust covers sitting on the ground next to the car. They did not fit with the larger rotors so rather than try and bend them out of the way and risk the cover contacting the rotor, I just removed them. Maybe I'll purchase the ms3 dust covers one day, or I'll just cut back the stock ones I have, not worried about it too much right now.
http://i1231.photobucket.com/albums/...ps1a393c82.jpg

flatlander937 07-15-2013 11:29 PM

Just FYI VTCS flap removal bumps you to street modified at least.


Otherwise looks good. Will be watching. I'm casually running stf because I want to fix the "Mazda problems" it came with... motor mounts and wheel width in particular.


Edit: do you have your old 3S caliper brackets? I have an I model and want to run the S brakes myself. I think the speed 3 brakes are heavy and over kill for autox... if you plan on track driving they're a great choice then though.

dgross7 07-16-2013 03:44 PM

Right now I am torn on the brakes. While they are a definite improvement, I wonder whether the change to hawk HPS pads or the speed 3 calipers made the largest improvement. I only had stock pads on before.

And thanks for bringing the flaps to my attention, after reading more carefully I see I am not allowed to modify them.

philrab 07-16-2013 03:52 PM

From my experience AutoXing, I'll give you two options.

1. You're a dedicated, serious Autocrosser for life. Read the rule book like it's your bible, be prepared to make substantial changes to your car to stay competitive/within the rules year by year when they change.

2. This is the gateway drug that leads to track days. When you get tired of autocross, and want another challenge, you'll naturally make that progression. If that's the aim, then mod whatever you please, don't worry about what class you're in, and just concentrate on learning car control before you move into higher speeds/track days.

I chose option 2. in my Miata, and loved every second of it. By the time I quit autocrossing, I was in SM2 in a naturally aspirated Miata getting murdered, but didn't care. I was just on my way to track days, and as long as I got faster than last month I didn't care how far down in the class I was.

dgross7 07-16-2013 06:57 PM

Right now, I really enjoy autocross. With that said I would like to move to track days eventually, but I feel I will still enjoy being competitive in autocross.

I really appreciate the advice though, philrab!

flatlander937 07-16-2013 11:01 PM

Quote:

Originally Posted by dgross7 (Post 8787826)
Right now I am torn on the brakes. While they are a definite improvement, I wonder whether the change to hawk HPS pads or the speed 3 calipers made the largest improvement. I only had stock pads on before.

And thanks for bringing the flaps to my attention, after reading more carefully I see I am not allowed to modify them.

I'll say I'm unimpressed with HPS pads vs stock pads. I found no more overall stopping power, but they are easier to modulate and not so grabby. They're not bad or anything, just pointing out that most of your improvement is likely from the calipers and larger rotors.

I will go for EBC yellow pads next, others here have reported they are way better than HPS for autocross. I'll do those and 3S upgrade at the same time likely.

XCNuse 07-16-2013 11:11 PM

C&D did a good comparison of a selection of brakes. I came across it when GrifN was trying to figure out what to get (wanted stock but enough convincing from all sides was that was a bad idea).

But yeah, pretty good short read. HPS are good when cold, but AWFUL for trackdays, surely fine for AutoX, but once warmed up they begin to fail very fast; friend in a speed miata learned that the unfortunate way at the last track day. My new brakes have HPS pads and I will absolutely be swapping the fronts at least for something with more bite.
Otherwise, I've been very happy with my EBC Yellows. Plenty of dust compared to stock but that's to be expected, braking is excellent, and when up to temperature also great. I only had an issue with mine once at that trackday, pushed to hard, had a bit more fade than I wanted, but oddly that only occurred once.

http://blog.caranddriver.com/performance-brake-pads-compared-hawk-hps-hawk-hp-plus-ebc-yellowstuff/


dgross7 07-17-2013 12:36 AM

Quote:

Originally Posted by flatlander937 (Post 8788674)
just pointing out that most of your improvement is likely from the calipers and larger rotors.

This is reassuring, and maybe yellowstuff will be my next upgrade, I'm going to look into it. Really glad to hear the improvement is probably mostly calipers though.

Adam3s 07-17-2013 05:19 PM

I had the HPS pads before I switched to the EBC yellows (still have the HPS on the rear actually with Yellows up front). As Tony said up above the HPS is pretty much a regular pad marketed by Hawk as a "performance pad." It wears like a regular pad, it dusts like a regular pad, it stops like a regular pad. There is really nothing high performance about them and they are not better than the oem pads...maybe even worse (ie less bite). HPS to Yellow is a night and day difference. Waaaay more initial bite and ultimate stopping power than HPS hot or cold. It will take awhile to readjust your brain and muscle memory because they quite literally need half the pedal pressure as the HPS to brake the same distance.


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