miata_racer's turrible STF build thread - Page 12 - Mazda3 Forums : The #1 Mazda 3 Forum
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post #111 of 259 (permalink) Old 02-27-2014, 07:18 PM Thread Starter
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just bought some 15x7.5 slips. I'll do a test with my nationals tires back to back against the 17s. We'll see what works good for me.

(DISCLAIMER) what works best for me only SOMETIMES works for others. I've had some who drive cars I setup who love them. Others can't wait to get out and don't like the rotation they usually have

David Hedderick
08 Mazda 3s Sport - new STF car (sponsored by BC Racing NA and BFG)
2013 MS3
92 Miata - SSM light project
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post #112 of 259 (permalink) Old 02-28-2014, 10:46 AM Thread Starter
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just ordered stiffer front springs. I'll test them in DFW in a week and a half. THe front end feels like it has too much roll and movement. I went up on compression up front and that helped. A bump up in rebound also helped keep the nose settled as well.

I think I'll still get some stiffer rear springs to have for nationals just in case I need the rotation

David Hedderick
08 Mazda 3s Sport - new STF car (sponsored by BC Racing NA and BFG)
2013 MS3
92 Miata - SSM light project
(formerly 2011 STF Mini Cooper)
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post #113 of 259 (permalink) Old 02-28-2014, 10:50 AM
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just bought some 15x7.5 slips. I'll do a test with my nationals tires back to back against the 17s. We'll see what works good for me.
Please share your findings. Back to back comparisons like this are very newsworthy....

So where are you on spring rates right now? Hard to keep up with you at times. You move around pretty fast.

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post #114 of 259 (permalink) Old 02-28-2014, 11:56 AM Thread Starter
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i'm at 10k front and 12k rear.

the testing will be on asphalt so we'll see how it goes. I'll get to test again on concrete in 2 weeks though.

David Hedderick
08 Mazda 3s Sport - new STF car (sponsored by BC Racing NA and BFG)
2013 MS3
92 Miata - SSM light project
(formerly 2011 STF Mini Cooper)
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post #115 of 259 (permalink) Old 02-28-2014, 01:12 PM
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Quote:
Originally Posted by miata_racer View Post
just bought some 15x7.5 slips. I'll do a test with my nationals tires back to back against the 17s. We'll see what works good for me.

(DISCLAIMER) what works best for me only SOMETIMES works for others. I've had some who drive cars I setup who love them. Others can't wait to get out and don't like the rotation they usually have


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Please share your findings. Back to back comparisons like this are very newsworthy....
Yes definitely this ^. Real world back to back testing would be nice. Hopefully you can minimize or eliminate the big variables when you do this testing (used, worn out vs new tires for instance). There is no reason (on paper) why the 17's should be faster unless it was an exceptionally fast course and you need to spend a lot of time above 60 mph. Even this can be mitigated by raising the rev limit to 7,500 rpm giving the 225/45/15 tires a top speed of nearly 65 mph in 2nd gear.
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post #116 of 259 (permalink) Old 02-28-2014, 03:19 PM
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ALSO, swapped to a lighter battery and saved 28lbs No it's not the lightest one available, but it's going to still start the car when I need it to.


You got one big ass battery there on the left if you saved 28 lbs. An OEM size battery weighs 28ish lbs on it's own, that Odyssey weighs around 15 lbs.

OEM size battery I have has 575 CCAs'. That Odyssey battery only has 170 CCA's and designed for small motorcraft and motorcycles like most small batteries. Not sure if the 14 lb weight savings for $110+ outlay of money is worth it, especially for a far less powerful and reliable battery. 14 lbs of sprung weight isn't much at all on a 2900 lb+ car with driver. Perhaps if you beat me by .001 I'll change my mind .

Last edited by Adam3s; 02-28-2014 at 03:37 PM.
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post #117 of 259 (permalink) Old 02-28-2014, 03:50 PM
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You got one big ass battery there on the left if you saved 28 lbs. An OEM size battery weighs 28ish lbs on it's own, that Odyssey weighs around 15 lbs.

OEM size battery I have has 575 CCAs'. That Odyssey battery only has 170 CCA's and designed for small motorcraft and motorcycles like most small batteries. Not sure if the 14 lb weight savings for $110+ outlay of money is worth it, especially for a far less powerful and reliable battery. 14 lbs of sprung weight isn't much at all on a 2900 lb+ car with driver. Perhaps if you beat me by .001 I'll change my mind .
Wow. I didn't remember the PC680 weighing that much. Had one in my old STX E36, and always thought it was 10 pounds. Just checked, and sure enough it's 15 pounds. I also checked the Optima (by model number) pictured on the left, and it's 38 pounds.

IMO, the battery is one of the cheapest and easiest ways to drop weight on any car, and coming off the front end of a FWD can't hurt. I'm planning to go with something in the 3-6 pound range.
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post #118 of 259 (permalink) Old 02-28-2014, 03:57 PM
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Wow. I didn't remember the PC680 weighing that much. Had one in my old STX E36, and always thought it was 10 pounds. Just checked, and sure enough it's 15 pounds. I also checked the Optima (by model number) pictured on the left, and it's 38 pounds.

IMO, the battery is one of the cheapest and easiest ways to drop weight on any car, and coming off the front end of a FWD can't hurt. I'm planning to go with something in the 3-6 pound range.
Wow, yeah that Optima weighs 10 lbs more than an OEM replacement battery then. I'd love to get into the 3-6 lb range and take some real weight off the car but I'm very concerned about reliability since this isn't a trailered car. I need it to start in the morning of the event at the hotel parking lot then several more times later that day Gonna look at some Deka batteries and see what's out there. Is that what you're looking at?
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post #119 of 259 (permalink) Old 02-28-2014, 04:21 PM
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Wow, yeah that Optima weighs 10 lbs more than an OEM replacement battery then. I'd love to get into the 3-6 lb range and take some real weight off the car but I'm very concerned about reliability since this isn't a trailered car. I need it to start in the morning of the event at the hotel parking lot then several more times later that day Gonna look at some Deka batteries and see what's out there. Is that what you're looking at?
Just buy a lightweight battery to change out on site at the events. Keep your regular battery on hand in case of any problems.

I think the Deka ETX9 is a popular option, but you can get the same battery in the MagnaPower version from Advance Auto Parts for less. Just search ETX9 on the Advance website, add it to your cart, then search for the best coupon code on retailmenot. Should be pretty cheap that way. I believe the ETX9 is in the 6 pound range. You can also get larger models of that battery for more reliablity. I'm also considering going with a Ballistic Evo in the sub 5 pound range, but haven't made a decision yet.
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post #120 of 259 (permalink) Old 02-28-2014, 04:28 PM
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Just buy a lightweight battery to change out on site at the events. Keep your regular battery on hand in case of any problems.

I think the Deka ETX9 is a popular option, but you can get the same battery in the MagnaPower version from Advance Auto Parts for less. Just search ETX9 on the Advance website, add it to your cart, then search for the best coupon code on retailmenot. Should be pretty cheap that way. I believe the ETX9 is in the 6 pound range. You can also get larger models of that battery for more reliablity. I'm also considering going with a Ballistic Evo in the sub 5 pound range, but haven't made a decision yet.

set all the radio presets!

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