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  1. kerrynzl

    S197 suspension motion ratios

    The 2008 Super Cobra Jet was originally built as a spec racer for "stock eliminator" racing. Ford needed to replicate this as a customer car. In original form ,they were a disappointment on paper [not as a collectable] They weighed 3240 lbs with a heavy 5.4 4v supercharged engine rated at 425...
  2. kerrynzl

    S197 suspension motion ratios

    Ford's main priority is to use propriety parts from their own parts bin. And even though there is a lot of specialty knowledge out there, the level of skilled engineers at the factories is very high.[and big budgets] With cornering ,weight transfer / body roll is not desirable, But with...
  3. kerrynzl

    S197 suspension motion ratios

    Unfortunately I can't help with coil spring heights measurements because my car was fitted with coil-overs all round. For a street racer , I would look at what Ford did with their FR500CJ drag package. They used stock Mustang GT front springs and V6 rear springs The idea of using softer V6...
  4. kerrynzl

    S197 suspension motion ratios

    The mounting points on the unibody is the same! The rear spring still mounts directly over the axle tube so the motion ratio is still 1:1 The 11+ front A-Arm [LCA] has the same geometry and can swap over with a minor modification [boring out the knuckle for the larger ball-joint shank /or swap...
  5. kerrynzl

    S197 suspension motion ratios

    The OP's car is an '06 and my car [which I measured is an '05] The geometry pertaining to the OP's original question is basically unchanged on the '11+ models. The main difference is the upper strut /tower mounts and electric power steer. [and bushings] Unless the car is converted to rear...
  6. kerrynzl

    S197 suspension motion ratios

    It was not a matter of "calming down". I was trying to answer your question appropriately based on relevant information supplied. I wasn't offended in anyway at all If we forget about motion ratios and actually refer to "Wheel Rate" [spring stiffness divided by motion ratio squared] it is the...
  7. kerrynzl

    S197 suspension motion ratios

    This was posted in the corner carver section so your intended usage was misleading. My advice then is don't fuck with it , just buy decent tyres and be done with it. As soon as you lower an S-197 you start upsetting things and you need to start correcting induced geometry problems. 99% of the...
  8. kerrynzl

    S197 suspension motion ratios

    The motion ratio of a MacPherson Strut is 1.11:1 due to "king-pin inclination" [angle of the strut] This can also be calculated as 0.9:1 depending on you base calculation method 1" at the strut = 0.9" at the spindle or 1" at the spindle = 1.11" at the strut The motion ratio also changes [due...
  9. kerrynzl

    Torque steer -- moderate throttle

    That means the rear could be steering to the right because the LR wheelbase is shortening under torque Or it is a front end steering issue. [under lift] Get somebody to observe the wheel movement in the wheel arch while you go from forward to reverse. [check both sides] And also check lateral...
  10. kerrynzl

    Torque steer -- moderate throttle

    Does the rear pull to the left? [Requiring Left steering input to keep it straight] or does the front steer to the left? [Requiring Right steering input to correct] When you lowered the rear did you add LCA relocation kit? [if not this could be the issue] Your car could have rear roll...
  11. kerrynzl

    Panhard bar questions

    Sounds like he has a "Hackjob adjustable" Panhard. If the car has been lowered , they put a bend in the Panhard to center the rear-end.[shortening it from Eye-to-Eye] If the wheels are centered ,leave it alone [or blow some $$$ on an adjustable Panhard]
  12. kerrynzl

    LCAs relocation brackets necessary?

    When you lower the car [as mine has] it lowers the "instant centre" [IC] This increases squat at the CG and also increases "overturning moment" [ front lift and rear squat due to weight transfer] This is because drive "thrust" is applied at the IC, and resistance is at the CG. creating a...
  13. kerrynzl

    LCAs relocation brackets necessary?

    It also depends on driving style. My FR500C has stock brackets and a lot of Neg camber on the front. [the rear end has a lot of "roll understeer"] This combo [Fr and Rr] makes the car feel twitchy on bumpy straights BUT it is actually quite stable. It self aligns so I can actually take my hands...
  14. kerrynzl

    Battery Relocation

    To anybody with the Battery Cut-Off/Isolator switch mounting dilemma.[especially with motorsports in a street car] Here is where the factory mounted the Battery Cut-Off/Isolator switch on the FR500C. [on the A-Pillar of the roll cage] so it can be reached by both the driver or the safety crew...
  15. kerrynzl

    Battery Relocation

    ?????? Are you referring to the BMW battery distribution block, And a trunk mounted battery? Are you going to use a Battery isolator cut off switch? or not? If you look at the BMW battery distribution block , diagonally opposite #2 is a 4th post.[below] This is where BMW hook up the Charge Wire...
  16. kerrynzl

    Battery Relocation

    Should you decide to mount the Battery Isolator switch in the rear close to the battery [which I'm not against this idea, just the FIA requires this at the base of the windshield] You will need to make up a whole new main feed from the starter to the Isolator switch. Another Cheat method is to...
  17. kerrynzl

    Battery Relocation

    The passenger side fender is already drilled for an aerial from factory. AND it is right next to the existing battery box. Just drill a few holes in the inner fender and use some grommets to run the cable through. That way you can use the Battery Isolator switch as a joiner with the existing...
  18. kerrynzl

    Battery Relocation

    I'll need to dig into my resources here. I was given a couple of "Stud Blocking Diodes" from an electrical engineer friend that played around with H/D electric motors.[they are not cheap at approx $10-$12 vs about 10c each] It worked really well [especially on my old B/B Corvette race car where...
  19. kerrynzl

    Battery Relocation

    With the Battery in the trunk you have a live H/D cable from the + post to the starter solenoid [and maybe an isolator switch in between] With a Ford starter solenoid this wire is dead [after the solenoid] except when cranking the engine over. I witnessed a serious accident when a touring car...
  20. kerrynzl

    Battery Relocation

    We race under FIA sanctioning body [international] I've seen the "clerk of the course" walk along the dummy grid and flip off all the isolator switches [then disqualify the cars with their engines still running] On my last race car [an Aussie Falcon Touring Car] we used a Ford Starter Solenoid...
  21. kerrynzl

    Battery Relocation

    You leave the charge wire on the Battery side of the Isolator Switch! This prevents the Alt charge backfeeding to the ignition and keeping the Engine running. But as you observed it remains hot all the time! The simplest remedy is to add a H/D diode in this wire [close to the battery as...
  22. kerrynzl

    Neutral revving problem

    Leave it in gear and try it again![with your foot on the clutch] A lot of Fords have 2 rev limits .......3000 is usually for neutral I know Autos also have this feature [even Euro and Aussie Fords] This is to save the trans when some drivers shift into neutral at a stoplight.[then forget]
  23. kerrynzl

    Max mpg s197 mustang build?

    I have 2. A sedan daily driver. And a Cheap wagon to tow the Race Car The wagon actually has lower miles on the clock, but the paint is f**ed [typical car dealer "blowjob on the hood in the early years] Seen here with me posing in front of it. Another photo so I don't offend the Ford crowd
  24. kerrynzl

    Max mpg s197 mustang build?

    That is surprisingly good [the 27mpg part] Going from 80 kph to 140 kph is a 75% increase in speed. So 1.75 x 1.75 = 3.06 You actually need 3.06 x hp to overcome the drag. The pickup was a P.O.S that didn't look roadworthy [but it was driven between paint jobs] I pulled out of a rural side...
  25. kerrynzl

    Max mpg s197 mustang build?

    I own a C7 Corvette . Totally stock 8 speed auto. I regularly get 35mpg on open road trips [confirmed at the pump And the computer] This is 41.5 mpg Imperial gallon [US Gallon = 3.8 litres , Imp Gallon =4.5 litres] The Corvette is slippery but so is the Mustang .The biggest aerodynamic aid on...

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