Hi guys.what's the best rear spring rate with coil over Pro shocks and 400HP.
300 350 400pounds??? My old spring is too soft on drag track but i dont know the rate of this spring, do you can help me!
Thank you
Mine are 350 at the rear but this car has not seen à handle ver well this way.
Cheers
Mk4
__________________
Mark IV Kit arrived on Sept 17 Th 2010
Engine started on December 23 Rd 2010
First GOKART ride December 27 th 2010.
Body work started on March 5 th 2011.
Interior and GoKart completed july 17th 2011
Paint completed november 30 th 2011
Police inspection march 7 th 2012
Mechanical inspection april 2nd. 2012
Tags and on the road may 9th 2012
Alain, I think your car (a MkII or III?) has 250 rear springs. that is what was on my MkII w/ ProShocks and was pretty common on all FFRs until the MkIVs. The MkIVs came w/ 350s but that is w/ the FFR Konis so i don't think you want to go w/ that on your car. I suspect that 300s would help you out.
__________________
FFR 5353K,351/400hp,TKO 500, 3-link w/3.08 and Truetrac, Koni DA coilovers front and rear,APE hardtop,Forte front and VPM rear swaybars
I have 250 springs on the rear of my MK1, and I also have a 8.8 rear (4-link) with 3.55 gears, I have a little over 500 hp. I am thinking of jumping up to 350 or 400 springs.
Is your car mainly a drag racing car? How many miles are on your Pro-shocks?
Last edited by Crashburndie; 09-17-2012 at 07:12 PM..
Some springs have a small metal tag around one of the coils w/ a number on it. Others have a number engraved on the flat part of the spring at one end or the other.
__________________
FFR 5353K,351/400hp,TKO 500, 3-link w/3.08 and Truetrac, Koni DA coilovers front and rear,APE hardtop,Forte front and VPM rear swaybars
Difference was staggering. Comfortable ride to firm. Car hooks and handles. May be a little to harsh for most street only cars.
__________________
FFR5148K MkII Roadster, FRP 306 345HP w/ carb, 3-link, disc brakes, Still Gel-Coat Grey! Now with roll cage and more track stuff, wrecked, beaten, man-handled, cut up, butchered, Freaky body mods, sat on by HOOTERS girls, still barely street legal.
Difference was staggering. Comfortable ride to firm. Car hooks and handles. May be a little to harsh for most street only cars.
x2 went with 600F and 450R handles WAY better...the ride...well..with the bilstiens...not too bad, but not great. That with the Kirkey seat (little cushioning)...I will be changing to some QA1's from Breeze VERY soon.
For drag racing however...why would want to go stiffer in the back??? I lost .2-.3 off my 60' foot going from 250's to 450's
Welcome to FFCars! The
representations expressed are the representations and opinions of
the FFCars.com forum members and do not necessarily reflect the
opinions and viewpoints of the site owners, moderators, Factory Five
Racing, Inc. or Ford Motor Company. This website
has been planned and developed by FFCars.com and its forum members
and should not be construed as being endorsed by Factory Five
Racing, Inc. or Ford Motor Company for any
purpose. "FFR", "Factory Five", "Factory Five Racing", and the
Factory Five Racing logo are registered trademarks of Factory Five
Racing, Inc. FFCars.com forum members agree not to
post any copyrighted material unless the copyrighted material is
owned by you. Although we do not and cannot review the messages
posted and are not responsible for the content of any of these
messages, we reserve the right to delete any message for any reason
whatsoever. You remain solely responsible for the content of your
messages, and you agree to indemnify and hold us harmless with
respect to any claim based upon transmission of your message(s).
Thank you for visiting the FFCars.com Forum dedicated to Factory
Five.
Linear Mode
