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Last Post 29 Oct 2014 10:43 AM by  Nathan Atkins
STX Weight and power
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Charlie Davis
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30 Jan 2013 08:24 PM

    I was asked recently about relative power, torque and weight of various STX cars. I have to admit that I don't know much about cars in the class other than the E36s. I've heard 2650 lbs. for the RX-8s, have no idea of power and torque. I've heard the FRS can get down into the mid 2500s (saw a post indicating 2584 with a 1/4 tank of gas, trunk cleaned out, light wheels and battery, seats weighed at 43 lbs each not yet replaced) and I saw a dyno curve that indicated 174 hp@6500 / 146 lb-ft@4600

    So, here's mine, I'd love to hear what the RX-8s, Subarus, Scions, Type Rs, etc. weigh and what power and torque you're getting.

    325is: 2880 last weighed, (trying for 2840). 188 hp@6200, 166 lb-ft@5200

    How do I attach my dyno curve?

    Step right up, don't be shy...

    ToadATX
    New Member
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    Posts:5


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    30 Jan 2013 09:56 PM
    I'll play
    2008 Mazdaspeed 3 GT
    Weight at nationals 2940
    (Stock seats, full exhaust; with those gone I see 2890 ish)
    Hp 290
    Torque 320
    (Numbers pulled from other STX builders average, my car was road tuned)
    Aaron B
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    Posts:304


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    31 Jan 2013 11:30 AM
    I'm at 2790 with an 07 rx8. No sunroof, base model. Both seats are right at the 25#limit, 28 series koni shocks, aftermarket midpipe and cat back, Odyssey battery, aluminum crank pulley, mx5 rear bar and tr wheels. Could easily drop down to 2750 with lighter wheels and brakes, another couple pounds with a header and a few more with a lighter battery.you'd have to really stretch to get below 2700, probably a custom thin walled exhaust and next to no gas, so 2650 is the extreme end of the scale IMO.

    I'm still chasing that top end gremlin that's leveling off my power at 7200 rpm, so I'm only at 160whp and 135lb ft of torque, it's been that way at least all of the 2012 season. Figure your average healthy rx8 at 190-200whp, figure a little more or less depending on the dyno
    justint5387
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    Posts:176


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    31 Jan 2013 04:52 PM
    E36 about 2850 plus or minus 20 depending on scales, hp/tq just about the same as Charlie's plus or minus 10 (had an exhaust leak for the dyno, numbers weren't accurate)

    MS3 was 2920. Dynoed at 258hp/285tq with 91 octane and timing was conservative.
    CSP21
    Basic Member
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    Posts:308


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    31 Jan 2013 05:15 PM
    If you have dynos, post them please. Peak numbers don't always tell the story.
    Whiskey11
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    Posts:89


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    31 Jan 2013 07:41 PM

    Not nationally competetive or prepped yet but:

    2009 Mustang GT

    Roughly 3500lbs w/ quarter tank and about 170ish in weight to be removed.

    Stock power is about 265 hp and 280 lb*ft but potential for over 300/320 to the ground in STX trim.

    Torino1985
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    31 Jan 2013 10:31 PM

    I am running my Mach 1 with about 50 lbs in weight reduction so around 3500 with me in it. I have not weighed it since I have done all the mods but I have not done anything weight wise for any runs. The car handled best with a full tank of gas and the whole spare tire kit. Might be different after all the mods I made so I may drop 100 lbs this spring and with new seats to come I should be in the 3300 range. Driver seat weighs 55 lbs passenger about 40. I also pull my shaker assembly off to take some weight off the top of the car.

    I have fully modded the power side except for headers. Intake, high flow cats, and catback along with a dyno tune to come this spring. should put the car at 300 at the rear wheels and about 320 torque with over 250 ft/lbs from 2500 to 5000 rpm.

    The limited slip was upgraded to a Torsen TR2. And a short throw shifter

    Suspension was redone with H R race springs Koni Single adjustable and Steeda Front Sway bar. New poly bushings in the rear LCA's Will be going to a watts link after the spring nationals and most likely a fully adjustable sway bar after that. Then the car will be fully prepped except for a battery relocation which I am not sure if I want to do or not.

    So long story Short

    3400lbs 300HP/ 330 TQ at the wheels. For the moment.

    TeamRX8
    Veteran Member
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    Posts:2405


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    01 Feb 2013 01:52 AM
    2005 RX8, 2720 lbs with several gallons in the gas tank and heavy customization to get it there, no idea on dyno numbers because I use velocity vs time datalogging on a level road

    besides, dyno curves/numbers/wtf-ever are not all created equal so all you are doing is comparing grapefruit to watermelons in nearly all cases
    CSP21
    Basic Member
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    Posts:308


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    01 Feb 2013 09:06 AM
    Dyno curves, not the actual peak numbers are very useful, unless you don't like what they say.
    autocrossaddict
    New Member
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    Posts:36


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    01 Feb 2013 09:47 AM
    2012 JCW Mini Coupe, stock OEM 18"s and 1/2 tank was 2680. A local Mustang dyno show 201hp and 212tq at the wheels.
    VT2WA29
    New Member
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    Posts:7


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    01 Feb 2013 12:21 PM
    2011 Mazdaspeed 3

    I think I successfully attached my dyno (from a mustang dyno).
    I have full power mods for STX and tune. WHP 330, WTQ 351. Peak TQ is at 2900 rpm and peak HP is at 5800 RPM. Could get another 50 hp and 50 tq across most of the band if I did a 60/40 E-85 mix ratio (other 2nd gen mazdaspeed 3 have been doing it for a year with no negatives yet, I'm still waiting to see if the long term effects wreck havoc on their fuel systems, with a possible new ban on E-85 though, it may not matter).

    Car weighed 3284 lbs when it was cornerbalanced. Had 1/4 tank of fuel and I've done no weight reduction.

    Of course, this is to the front-wheels only. I can't get the power down in autocross but it sure is fun on the track.

    (EDIT: it appears I have no idea how to add an attachment, if someone could tell me how I'll add the dyno chart).

    CSP21
    Basic Member
    Basic Member
    Posts:308


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    01 Feb 2013 12:39 PM
    An MS3 can do 330whp/351wtq without touching the boost/wastegate tables? Impressive I had no idea that was possible without raising the boost quite a bit.
    VT2WA29
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    Posts:7


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    01 Feb 2013 12:44 PM
    Tom Reynolds wrote:
    An MS3 can do 330whp/351wtq without touching the boost/wastegate tables? Impressive I had no idea that was possible without raising the boost quite a bit.

    Yes, the 2nd Gen had minor differences done to the motor (beyond the PCV system, I'm not exactly sure what they were, the guy who tuned my car was telling me about them but to be honest it went in one ear and out the other).

    With increasing boost levels you can get around 360 hp and close to 400 tq at the wheels with STX allowed hardware.

    With just the "bolt ons" and no tune I dyno'd at 308 hp and 328 tq.

    Cito
    Advanced Member
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    Posts:583


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    01 Feb 2013 12:45 PM
    On the scrooge of all dynos, the Mustang dyno, no less.
    justint5387
    Basic Member
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    Posts:176


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    01 Feb 2013 02:35 PM

    Stock boost and stock fuel pump internals? I don't even make that much running higher boost for track...

    I remember Gen2 MS3 having to upgrade fuel pump internals just from intake and cobb stage1 tune. The way I read the rules, fuel pump internals can't be changed for ST

    85rx-7gsl-se
    Basic Member
    Basic Member
    Posts:282


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    01 Feb 2013 05:09 PM
    I wonder what a Cobalt SS/TC could do on an STX legal tune. I know they can make over 400 ft lbs of torque on stock turbo and e85 with raised boost, but it seems that no one has actually tried to have an STX legal tune done.
    murph1379
    Advanced Member
    Advanced Member
    Posts:627


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    01 Feb 2013 07:54 PM
    E46 330, currently at 3,070 lbs, thinking I could get to 3,050 lbs this year, 3,010ish with $$$ custom brake calipers.

    Not sure on power, never actually been to a dyno, guessing 220 hp, 215 tq based on similar cars.
    Aaron B
    Basic Member
    Basic Member
    Posts:304


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    01 Feb 2013 08:42 PM
    TeamRX8 wrote:
    2005 RX8, 2720 lbs with several gallons in the gas tank and heavy customization to get it there,

    Well, it sounds as though I was pretty much in the ballpark on my remaining weight loss estimate, thanks, Mark. :)

    I hope that helps you get a handle on a realistic weight for RX8s, Charlie

    jzr
    Veteran Member
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    Posts:1350


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    02 Feb 2013 01:56 AM
    ToadATX
    New Member
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    Posts:5


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    02 Feb 2013 11:46 AM
    justint5387 wrote:

    Stock boost and stock fuel pump internals? I don't even make that much running higher boost for track...

    I remember Gen2 MS3 having to upgrade fuel pump internals just from intake and cobb stage1 tune. The way I read the rules, fuel pump internals can't be changed for ST

    ^^ 91 octane is a partial cause for your big difference i'm sure. However I don't imagine he would hit those numbers on the local mustang dyno even with 100 oct, stock Sti's generally put down 200/200

    I am borderline unsafe with all of the factory fueling and keep a close eye on the fuel pressure. Come on, just let us replace ONE fuel pump >;-)

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