BMR Front Suspension Installed- Tubular K-Member, A-Arms and Radiator/Sway Bar Delete!!
As we continue our build of the Lethal GT500 we had a few things that still needed to be addressed. One of them being the weight of the car and second the upcoming installation of the 3.4L Whipple Supercharger.
The first item which definitely needed to be addressed was the weight. Ford claims the 2007-2008 GT500 coupe weighs in at 3,920 lbs. That’s a good 250lbs more than the previous 03-04 Cobra which was heavy enough. For many people that’s not that big of a difference but keep in mind that the 3,920 is about 400lbs heavier than the 05+ GT. When trying to build a car to run good times weight and HP are the 2 major concerns. You can add as much HP as you like but the weight will always be a factor in going faster. That’s why the GT500 in stock form really isn’t that impressive at the strip as it’s HP to weight ratio is out of whack.
The fix.. BMR front suspension!!
BMR Fabrication located in FL is one of the largest suspension companies in the industry. Making very high quality performance suspension parts for most Ford and Gm cars these guys had what we needed. The ability to drop weight and improve handling over the stock setup is what we had in mind. BMR’s 05-08 Mustang Tubular K-Member, A-Arms and Radiator Sway-Bar Delete are just what the doctor ordered.
Starting with the stock K-Member which weighs 44lbs it can easily be replaced with BMR’s Tubular K-Member for a 20lb weight reduction. The BMR K-Member is made of strong DOM Tubing and can be installed in a mere 2 hours. Their K-members also come in many different configurations which include using OEM or Windsor style motor mounts as well as Manual OE or Pinto style steering racks. The BMR K-Member will also house the stock or BMR A-Arms. So whichever route you feel like going there’s a K-member from BMR for your application. One of the features we also liked in the BMR K-Member was that they offer a version (KM011) which has the motor mounts in a position where it drops the motor height by 3/4 inches. This was a plus for us as we wanted to keep the stock hood when we install our 3.4L Whipple Supercharger. Although the 3/4″ drop isn’t enough by itself to make the blower fit under the strut tower brace or stock hood it was a great start.
The next BMR item which we added was their tubular A-Arms (AA010). The BMR A-Arms are a perfect match to their tubular K-Member and helped us to take some more weight off of the front end. They’re made from 1.25″ DOM tubing and include ball joints which are sourced directly from a Ford OEM supplier. The BMR Tubular A-Arms show below are lighter and stronger then the OEM stamped steel A-Arm. Each BMR A-Arm is 11.2lbs lighter than the stock A-Arm so when adding the pair you’re looking at another 22lbs in weight savings. Their also offered in Street (Poly Bushing) or Adjustable (Sperical Rod End) versions. We chose to go with the street version as we wanted to keep the stock feel of the front end and the rod ends tend to transfer noise more than a softer poly bushing does.
The third item from BMR which we added was their Lightweight Tubular Radiator Support/Sway Bar Delete (RS002). The 05+ Mustangs all utilize a chunky metal bracket to support the radiator. It’s not needed as crossmember was built extra strong to support the sway bar. So since we were removing the sway bar as well the crossmember only needs to support the radiator. With the removal of the Sway Bar and stock radiator support we saw a weight reduction of 26.5lbs.
The last BMR piece which we added to the front end was the front A-Arm Support (AAS001). This brace mounts on legs of either the stock or BMR A-Arms tying the legs of the K-member together. We felt it was a good idea to add this piece to add extra support for the added hp and street driving we do.
All of the BMR parts were installed at the same time we installed our exhaust. The reason for this is that it’s a lot easier to install the longtubes on the car with the K-member out of the way. So we basically killed two birds with one stone by removing the stock k-member to install the headers and then re-installed the BMR K-member after the headers were in.
REVIEW- After having the K-member/A-Arm setup in the car for a few months now and have driven several hundred miles with all of us are really impressed. Not only does the car drive great but we shed just about 70lbs of unwanted weight off of the front end. Before putting the K-member in we had heard several people say that we would lose streetability with the aftermarket K-member and would notice a considerable amount of noise vibration over the stock setup. This is not the case with the BMR K-Member. The car feels solid and smooth. Steering and handling is the same as it was before and it’s definitely helped us to shed some of the unwanted weight that the GT500 comes with. We took the car to the track twice since the new front suspension was installed and ran faster each time we went out. To this date our best time is a 11.423@123.42mph.
We definitely feel that the BMR front suspension will show a lot more benefitial later down the line as we make our way into the 10’s and then push further to the 9’s.
We’d like to say thanks the entire crew over at BMR Fabrication for not only participating in our build but supplying us and our customers the high quality suspension components. You guys have been great and we’re glad to be part of the crew.
For information about any of BMR’s parts please feel free to give us a call. 1-877-2LETHAL
Removal of the stock K-Member
K-Member Installation
http://bmrfabrication.com/INSTALL/KM009-010.pdf
INSTALLATION: 1. Lift vehicle and support with stands positioned under the frame rails. Remove both front wheels/tires. 2. Using a 18mm deep socket, loosen both outer tie rod ends. Knock both tie rods loose from the spindles. 3. Remove the power steering line retainer located in the center of the rack. This requires a 8mm wrench. See Image1. 4. Using a 18mm socket, remove both rack mounting bolts. Mark a line on the steering shaft at the front connection point to insure proper re-assembly location. Remove the front steering shaft bolt using a 13mm socket or wrench (See Image 2). Leave both power steering lines attached but move the rack out of the way to gain access to the front A-arm bolts. 5. Remove all 4 rear A-arm bolts using a 21mm deep socket. Using a 18mm socket, remove both front A-arm bolts. 6. Loosen and remove the A-arms’ ball joint cross-bolts using a 15mm wrench and a 18mm socket. Knock or pry the ball joint loose from the spindle. NOTE: It is not possible to remove the A-arms until the K-member is lowered. 7. Using a 15mm socket with an extra long extension, remove both motor mount nuts from the top. 8. Support the motor from below with a block of wood on a hydraulic jack. Lift motor slightly. 9. Using a 18mm socket, remove all 8 K-member bolts and lower the K-member/A-arm assembly. 10. Insert one of the polyurethane motor mount bushings and sleeve into both motor mounts stands on the K-member and lift the K-member up into place. Insert all 8 mounting bolts but do not tighten.
11. Line up the motor stands with the mounting bushings on the K-member. It may be necessary to shift the K-member or the motor slightly to get the holes lined up. Once lined up, position the other polyurethane bushings and supplied 2” washers on the bottom of the K-member mounting bracket and insert the supplied 3/8” bolt. The bushings should “sandwich” the K- member mount when installed correctly. Tighten the bushing mounting bolts to approximately 35 ft/lbs. using a 9/16” wrench and 9/16” socket. 12. Tighten all 8 K-member mounting bolts to 85 ft/lbs. using a 18mm socket. Lower jack and remove. 13. Install the A-arms using the supplied aluminum spacers and hardware (See Image 3). Tighten the front A-arm bolts to 100 ft/lbs. using a 22mm wrench and socket. Tighten the rear to 110 ft/lbs. using a 13/16” wrench and a 7/8” socket. 14. Insert the ball joint into the spindle and insert the cross-bolt. Tighten to 40 ft/lbs. using a 15mm wrench and 18mm socket. 15. Using the supplied bolts and washers, mount the rack to the K-member. When installing, verify that the steering shaft is positioned according to the previous mark. Tighten both mounting bolts to 85 ft/lbs. using a ¾” wrench and socket. Tighten steering shaft cross-bolt to 20 ft/lbs. 16. Mount both outer tie rods to the spindles and tighten to 85 ft/lbs. using a 18mm socket. 17. Re-install wheels/tires, double-check all mounting bolts and lower vehicle. 18. Due to production tolerance, an alignment is recommended after this installation.
A-Arm Installation
http://bmrfabrication.com/INSTALL/AA010_019.pdf
INSTALLATION: 1. Lift vehicle and support with stands positioned under the frame rails. Remove both front wheels/tires. 2. This step is not necessary for installation but makes the work area more accessible. Using a 18mm deep socket, loosen both outer tie rod ends. Knock both tie rods loose from the spindles. 3. Using a 15mm wrench and 18mm socket, loosen and remove the spindle bolt that clamps the ball joint to the spindle. 4. Using a 18mm socket, loosen and remove the rear A-arm bolts on the K-member. 5. Using a 18mm socket, remove the front A-arm bolt on the K-member. 6. Remove A-arm. 7. If you are installing BMR non-adjustable A-arms (AA010), proceed with the installation using steps 1-6 in reverse. If installing BMR adjustable A-arms, adjust the rod-ends to the approximate length of the OE A-arm and then install. DO NOT TIGHTEN THE FRONT A-ARM BOLT UNTIL THE SUSPENSION IS LOADED, FAILURE TO DO WILL CAUSE BUSHING PRE-LOAD RESULTING IN PREMATURE BUSHING WEAR. 8. With the A-arms installed, torque the bolts to the following specs: 1. Rear A-arm bolts – 95 FT/LBS. 2. Tie rod stud – 85 FT/LBS. 3. Ball joint cross-bolt – 40 FT/LBS. 4. If using BMR adjustable A-arms, tighten the jam-nut on the rod end at this time. 9. Repeat steps 3-8 for the other side. 10. Re-install wheels/tires and allow the vehicles weight to rest on the suspension. The suspension is now loaded and the front bushings may be tightened to 95 FT/LBS. If not on a service lift, this step may be done on ramps or blocks. 11. Grease all bushings on the A-arms with a grease gun. For optimal wear qualities and minimal noise, a silicone, polyurethane-specific grease is recommended.
Radiator Bracket/Sway Bar Delete
http://bmrfabrication.com/INSTALL/RS002.pdf
1. Lift vehicle and support safely with stands under frame rails. 2. Using a 18mm socket, remove the sway bar end links from the strut on each side. 3. Using a 15mm socket, remove the sway bar cross member mounts and lower the swaybar/endlink assembly. 4. Locate the plastic bumper cover support and remove the 7 screws using a 7/32” socket. Remove cover. 5. Using a 10mm socket, loosen the nut that retains the AC line clip to the top of the factory radiator cross member. 6. The brake lines are attached in two areas by clips on the cross member. One is located on the vertical section of the passenger side and the other is on the horizontal section of the driver’s side. Pop the brake line out of these clips. 7. Place a jack stand under the radiator to prevent it from moving when the cross member is removed. 8. Using a 18mm socket, remove the 4 bolts and lower the cross member. 9. Remove the two rubber isolators from the factory cross member and install them into the BMR cross member. 10. Install the BMR cross member and tighten nuts to 110 ft/lbs. 11. Remove jack stand from under radiator. 12. If using the factory bumper cover support, re-install it to the bumper cover and zip tie the back portion to the new cross member. Zip tie the brake line in the middle as shown in the image below 13. Lower vehicle.
March 11th, 2008
Leave a Comment
You must be logged in to post a comment.