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08-02-2009, 11:54 PM #1
New Raptor Racing Product IN STOCK: Dobinson Rear Lowering and Standard Springs
After months of development and another few months shipping them across the pond we finally have our shipment of Dobinson's in stock...currently we have approximately 52 sets of Dobinsons in stock.
For those that haven't been keeping up with this initiative we set to fill in a gap with Dobinson's line of rear springs for the MK2. There was nothing to change for the front Dobinson's. Their front "STANDARD" height spring lowers the car approximately 1" which is perfect for most people. A nice mating to this spring drop is a K-Mac Adjustable Strut top, which raises the front 1/2". Please note that we currently have about 5-7 of these front springs in stock.
So...getting to the rears: first off the standard height springs were just a tad too high for most peeps and some even found that cutting a coil from them really helped out. So what we did was have Dobinson create a whole new part number for the Standard height spring. The old standard height spring had a free height of 360mm; we dropped it ever so gently to 340mm.
Below you will see a before and after Pictures of the a P Type MK2, this vehicle has 90,000 original miles on it. The before pictures are with factory springs, the after pictures are with the newly created Dobinson Standard Height Rear Springs. The front springs are stock in all cases.
Both the car and the camera were in the exact same positions for the before and after shots.
Basically, the picture below is a 175 pound driver inside the car with the (5 speed) car in gear (important - especially in autos as stock spring autos squat an inch when put into drive from park). This to me is the *best* measurement (in gear, with driver) as the suspension is in it's 'active' state.
A little more explanation is needed of the 'active' state pictured above.
This ride height is actually 1/2" higher than with the softer stock springs. A 175 pound driver will squat a stock rear spring car 1", and a hard acceleration will squat the stock rear spring another 1".
This new Dobinson standard height rear spring keeps this rear squat in check better than stock with it's 232 lb/in spring rate.
Second; Dobinson's lowering springs for the MK2 were over 2" lower; far too extreme for anybody's liking. After testing the above spring on a P-Type and confirming the flair height matched what we expected; we asked Dobinson to change the specs of their lowering spring from 295mm free height to 320mm free height....in essence 20mm (~0.75") lower than the above mentioned standard height spring. Kudos must be given to Dobinson, because they believed us and actually changed their Mk2 lowering spring spec!
Below are some pictures of this spring on Ryan’s (Funkycheese) MK2; for these pictures he used the rubber isolator on the top only - the bottom it just sits on the bare control arm. The tire size in the picture is 275/40R17, and for those that don't know those wheels they are 17x9 with a +7mm offset. Below is also a picture showing the height of the flare, keep in mind the size of the wheels and there is nobody sitting in the drivers sit in this pix. Thanks Ryan for the pix.
Here is a pix of all 3 rear Springs...from left to right it's: Old Standard Height ->New Standard Height -> New Lowering:
A BIG thanks to Dangerous Ken for doing all the work testing the prototype spring and providing me with the pictures and feedback.
Pricing as stated in my suspension Catalog here is $162usd/pair shipped.
Payment and shipping info can be found here
Last edited by RaptorRacing; 08-03-2009 at 12:31 AM.
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