Re: Vorshlag 2011 Mustang GT 5.0 - auto-x/track build
Ok guys, I'm looking to buy some new wheels and tires and I keep going back and forth. Now I'm considering the D-force wheels too. You're saying they will work front and rear without spacers, but is that with a normal strut/spring setup? What's the biggest tire you guys have tried with them (diameter)?
The reason I ask is because I'm looking for just street tires right now and I'd rather not run smaller diameter tires...trying to keep fender gap to a minimum and I'm not lowering much. I think a 285/40-18 would be ideal, but there's a good deal on some 275/45-18's right now (with a 10.1" tread width). Those are some pretty big tires, actually a bit larger in diameter than the factory rubber...maybe too big, but I did find someone that's actually running them on a 18x9.5 et40 wheel.
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Vorshlag 2011 Mustang GT + S197 Development Thread
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Re: Vorshlag 2011 Mustang GT 5.0 - auto-x/track build
Terry, I've been following the brake rules, and it sounds like they're done messing with it for a bit. $800 seems cheap to me for a brake upgrade if it really sheds significant weight! Unfortunately the lighter options for my car are all north of $2k, so not likely to happen yet this year...
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Re: Vorshlag 2011 Mustang GT 5.0 - auto-x/track build
Oh yeah, if you feel like divulging the brand of that really wide "265mm" tire...I'm interested
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Re: Vorshlag 2011 Mustang GT 5.0 - auto-x/track build
Terry, my car is a non-Brembo. So, yep, spare tire in the trunk, 13" front brakes, and 18x8 wheels. I weighed after filling up the fuel tank about 1/8 mile down the road. The spare tire was 35lbs, the jack and tools were a little over 5lbs. So between that and the 10 gallons of fuel I mentioned you're looking at about 100 lbs out of my car. I think with it being a base model with standard brakes there's probably a noticeable weight advantage.
It's very tempting to autocross this car but I don't think I want to even try it in STX, it looks like STU is out with rule changes (?), and I don't feel like spending the money to set it up for ESP. So I might just throw some wheels on it that look cool (jeez, I never thought I'd say that) and remain a steet cruiser. I don't have an autocross car right now, but I'm keeping my eyes peeled for another E36. I still have a bunch of my E36 stuff including my AST suspension and 17x9 wheels, so I think that would be the smarter way to go after thinking about this. I do have some Steeda sport springs and Tokico's I picked up for a good price to make the Mustang a bit more fun and lower it a bit, so maybe some 18x9's with ST tires would be a good choice in case I want to autocross the Mustang in the mean time.Last edited by GaryK; 02-08-2012, 12:04 PM.
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Re: Vorshlag 2011 Mustang GT 5.0 - auto-x/track build
Originally posted by BlackNDecker View PostAffordable is subjective, but Fulltiltboogieracing.com sells 2-piece rotors for $675 + shipping. That is the cheapest price I've found:
http://www.fulltiltboogieracing.com/s197_brakes.htm
Originally posted by BlackNDecker View PostCan you tell me more about the mounting plate and bracket you used for the Odyssey battery? Is this a production piece? Any issues with cranking amps? I've been pleased with Odyssey batteries in the past.
If you go back in this thread to post #92, I describe who's battery mount we used, and the other bracket and bits we fabricated to make it bolt into the Mustang without having to drill any holes.
I have PC680 Odysseys in 3 of my personal cars. Only car I have any issues with is one of my BMWs, which has a known battery draw when parked - and draws down the battery after about 5 days of non-use (no matter the battery). We keep it on a Battery Tender and its fine. One of these days we'll chase down the voltage leak...
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Re: Vorshlag 2011 Mustang GT 5.0 - auto-x/track build
Affordable is subjective, but Fulltiltboogieracing.com sells 2-piece rotors for $675 + shipping. That is the cheapest price I've found:
http://www.fulltiltboogieracing.com/s197_brakes.htm
Can you tell me more about the mounting plate and bracket you used for the Odyssey battery? Is this a production piece? Any issues with cranking amps? I've been pleased with Odyssey batteries in the past.
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Re: Vorshlag 2011 Mustang GT 5.0 - auto-x/track build
Originally posted by BlackNDecker View Post1) Have you looked into 2 piece rotors? Are these allowed? Full-Tilt boogie racing's rotors are affordable and shed some decent unsprung weight.
The stock 14" Brembo rotors are a staggering 25.4 pounds each!
Originally posted by BlackNDecker View Post2) The tiger racing vented hood is also a pretty big weight savings (10 lbs for CF, 20 lbs for Fiberglass, vs. ~35 lbs for OEM hood).
Originally posted by BlackNDecker View Post3) How bout an aluminum or carbon fiber drive shaft? That would net another 15-30 lbs of weight reduction.
Originally posted by BlackNDecker View Post4) I'm sure you've considered a dry-cell battery (Odyssey PC680 weighs 15 lbs vs. 30 lbs OEM).
Already installed. Gallery: http://vorshlag.smugmug.com/Projects...-race-battery/
Originally posted by BlackNDecker View Post5) Removing sound deadening? This would probably net another 30-40 lbs.
Originally posted by BlackNDecker View PostIn all, the above probably shave another 75-80 lbs from the car getting you into the 3300 lb category. I believe the Boss 302S cars weigh a svelte 3000 lbs with a single race seat and no interior.
Thanks,
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Re: Vorshlag 2011 Mustang GT 5.0 - auto-x/track build
1) Have you looked into 2 piece rotors? Are these allowed? Full-Tilt boogie racing's rotors are affordable and shed some decent unsprung weight.
2) The tiger racing vented hood is also a pretty big weight savings (10 lbs for CF, 20 lbs for Fiberglass, vs. ~35 lbs for OEM hood).
3) How bout an aluminum or carbon fiber drive shaft? That would net another 15-30 lbs of weight reduction.
4) I'm sure you've considered a dry-cell battery (Odyssey PC680 weighs 15 lbs vs. 30 lbs OEM).
5) Removing sound deadening? This would probably net another 30-40 lbs.
In all, the above probably shave another 75-80 lbs from the car getting you into the 3300 lb category. I believe the Boss 302S cars weigh a svelte 3000 lbs with a single race seat and no interior.
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Re: Vorshlag 2011 Mustang GT 5.0 - auto-x/track build
Originally posted by twistedneck View PostNice upgrades to the exhaust.. i swear i can hear my slip on axle backs leaking.. but its too late now!
Have you considered adding hood vents for front end grip also? The new functional hood vents for 2013 reduced lift in front significantly from what the engineers have told me. No more hood trying to bow up in the center and rip off over 150 MPH. I'm looking for a simple way to cut the hood and add in the 2013 vents.. watch the Boss 302R in car footage from the 2012 Rolex race, that hood is bowing up when Ian James hits about 150MPh
Originally posted by GaryK View PostI don't know if you guys are interested or not, but I weighed my 2012 base GT with manual trans and no options other than front plate bracket. With everything in the car as it comes from Ford and a full tank of fuel it showed 3608 lbs on the scales.
Just taking the spare tire and associated junk out along with the floor mats and dropping 10 gallons of fuel would get it down to about 3500 lbs. I know the Brembo brakes add a bit, but I'm guessing the premium model adds some weight relative to the base model too.
Gasoline is a little over 6 pounds per gallon, so that's about 60 pounds if you drop 10 gallons. Add in the trunk junk and you've lost about 73 pounds, so around 3535 or so.... but yea, its getting down there. If you do have a spare tire that will weigh more, of course.
This was the weight of a loaner '11 Brembo GT back in June 2010 - 3605 lbs with 1/2 tank of fuel
After weighing this Brembo / 19x9" equipped loaner we borrowed from a Ford dealer we custom ordered our 2011 GT with all sorts of options I didn't want (my wife - oiy!) and it came in even heavier. We ran it out of fuel, removed the "trunk junk", then weighed it at 3563 lbs baseline. I always try to weigh them with nearly no fuel, or show the fuel gauge to account for fuel weight.
This is the weight on our '11 Brembo GT with no fuel - 3563 lbs sans 12.7 lbs of "trunk junk"
Sounds like your '12 is a little lighter than our car - probably different options and such, or the brakes. We've been on a quest to lose weight from this S197, and here's where we have it now with 18x10" wheels and 275/40/18 tires:
Not much left we can remove or lighten and remain SCCA STX legal. Again, we're building this around two very different class rules, SCCA STX and NASA TTS, but using the SCCA ruleset when one set limits the other. Most of the cars we are racing against in STX are 2800-3000 pounds, but have the same tire width limits we do, which puts the Mustang at a disadvantage - but I knew that going in. If I could just find a "265" tire that was magically 11" wide... well, I came close. I've got one that is 10-3/4" wide. I'm not telling which brand it is though.
Cheers,
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Re: Vorshlag 2011 Mustang GT 5.0 - auto-x/track build
I don't know if you guys are interested or not, but I weighed my 2012 base GT with manual trans and no options other than front plate bracket. With everything in the car as it comes from Ford and a full tank of fuel it showed 3608 lbs on the scales.
Just taking the spare tire and associated junk out along with the floor mats and dropping 10 gallons of fuel would get it down to about 3500 lbs. I know the Brembo brakes add a bit, but I'm guessing the premium model adds some weight relative to the base model too.
Leave a comment:
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Re: Vorshlag 2011 Mustang GT 5.0 - auto-x/track build
Nice upgrades to the exhaust.. i swear i can hear my slip on axle backs leaking.. but its too late now!
Have you considered adding hood vents for front end grip also? The new functional hood vents for 2013 reduced lift in front significantly from what the engineers have told me. No more hood trying to bow up in the center and rip off over 150 MPH. I'm looking for a simple way to cut the hood and add in the 2013 vents.. watch the Boss 302R in car footage from the 2012 Rolex race, that hood is bowing up when Ian James hits about 150MPh.
http://www.youtube.com/watch?v=T4WOSu9rtLY
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Re: Vorshlag 2011 Mustang GT 5.0 - auto-x/track build
Originally posted by Fair! View PostFeb 25th? Hadn't heard about it - what group? Costs?
http://www.eaglescanyon.com/2008/home.php
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Re: Vorshlag 2011 Mustang GT 5.0 - auto-x/track build
Originally posted by ShaneM View Postyou guys hitting the HPDE feb 25 at ECR? i would like to see some track times on mods for boss 302's that show gains, do you guys have any local boss customers you can lure to the track with your stuff installed? We are all looking for track proven parts to lower times without upsetting the balance of the car.
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Re: Vorshlag 2011 Mustang GT 5.0 - auto-x/track build
the brake cooling ducts help, I have the Boss 302 LS ducts on my Boss. However, i was also running the HP+ pads on my car at ECR (the orange Boss at the toy run) and have been having significant brake fade on those pads. I am going to move to carbotech, some of the guys that road race a lot say those pads do very well. they have a bobcat pad for the street with the same material as the race pads so you can run one set of rotors. They suggested running the XP8 out back for street and track and the XP10 front or the RP2 pads on track.
the RP2 is their endurance pad so it will have longer life. basically the same stopping power as the XP10, with less modulation. the trade off is longer pad life. in for results on the LS splitter, i have been eyeing that part. I do know one guy that was able to install his splitter by removing the grill alone FWIW.
you guys hitting the HPDE feb 25 at ECR? i would like to see some track times on mods for boss 302's that show gains, do you guys have any local boss customers you can lure to the track with your stuff installed? We are all looking for track proven parts to lower times without upsetting the balance of the car.Last edited by ShaneM; 01-26-2012, 05:01 PM.
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Re: Vorshlag 2011 Mustang GT 5.0 - auto-x/track build
If you are only getting 2-3 laps before the brakes fade, then look into the FRPP brake cooling kit. Night-and-day difference on mine... and the 70s now last an entire session.
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