02GF74
|
 posted on 7/9/06 at 01:00 PM |
|
|
teach me about coil springs
I'll assume I'll probably be needing different springs, perhaps a coil over shock at the rear.
How do I determine what poundage (i.e.,spring rate) to fit?
If I knew the poundage at the front, would that help with choosing the rears?
I am looking for mostly road use and to be nicely blanced i.e. the rear rides in harmony with the front (hmmmm ... now what exactly does that
mean.....)
(sorry for the basic question but never had to mess with them before).
|
|
|
|
|
Hammerhead
|
| posted on 7/9/06 at 01:16 PM |
|
|
I think the MK Indy uses 250lb protech coilovers on the back.
|
|
|
procomp
|
| posted on 7/9/06 at 01:27 PM |
|
|
Hi i take it from your other post that it is a live axle as per the book if so you need to select the right dampers and go for somthing like 120-140lb
springs if it is mainly just you in the car or if it is mainly whith a passenger try 140-160lb max. these will work if it is the english axle if it is
the atlas type you will have problems getting it right due to the extra weight of the atlas axle over the english axle.
cheers matt
|
|
|
02GF74
|
| posted on 7/9/06 at 01:39 PM |
|
|
yep - it is english axle in more or less book chassis.
I don't know how the links differ, if that is relevant. or do I have any info about the ones fitted - I doubt that sort of info would be in the
Haynes manual 
|
|
|
NS Dev
|
| posted on 7/9/06 at 03:33 PM |
|
|
just to concur with Procomp (who knows much better than me!)
Good start point 140lb rear 225-250lb front
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
|
|
|
omega 24 v6
|
| posted on 7/9/06 at 04:06 PM |
|
|
Ok if no one minds I'll jump on the band wagon here.
What if any are the differences in a 1.9 or 2.5 inch spring of the same rate (poundage)
Also as the atlas axle is heavier does anyone have a good starting point for a 442 with an atlas (capri).
As usual thanks in advance for any info and sorry for thread hijacking
|
|
|
Marcus
|
| posted on 7/9/06 at 04:26 PM |
|
|
I think the atlas issue is more to do with getting the damping right for the weight of the axle rather than spring rate. I'd probably start at
the top end of the spring rates, say, 160lb and play with the damping (if you're lucky enough to have adjustable bump and rebound)
Marcus
Because kits are for girls!!
|
|
|
ruudbeckers
|
| posted on 7/9/06 at 04:56 PM |
|
|
MK has supplied me with 300 lbs at the front and 200 lbs at the back for my Indy.
Cheers Ruud
|
|
|
Peteff
|
| posted on 7/9/06 at 06:48 PM |
|
|
If your dampers are upright the spring rates are lower than inclined ones as the leverage is different, hence the higher rates on Indy rears and the
like.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
|
|
|
TangoMan
|
| posted on 7/9/06 at 08:24 PM |
|
|
I have put 150 rears on my live (English) axle. Previosu fitted 180's made for a harsh ride and made the back end very loose. The 150's
seem to have given a better balance and certainly a better ride. Whether this will have induced understeer is yet to be decided. I will wait for the
next trackday to find out.
Summer's here!!!!
|
|
|
procomp
|
| posted on 8/9/06 at 07:25 AM |
|
|
HI omega there is no big diffence between 1.9 and 2.25 springs other than there is a better range option in the 2.25 as that is what most of the
racers use.
And also the 1.9 tend to end up closer to coilbound sooner than the 2.25 due to there being more coils per inch for the same poundage spring .
As for the atlas axle due to it's extra weight it is hard to get the right ratio of valving in the dampers and spring combo to keep the axle on
the floor but also give a comfortable ride just to much unsprung weight.
cheers matt
|
|
|
02GF74
|
| posted on 8/9/06 at 09:39 AM |
|
|
ok, took a look at receipts/build manual and from memory the front springs are 180 lb (spax, rocker arm) .
I have an articule that says 150 were fitted on the rear but proved to be too soft - bottoming out - and 180 fitted.
Again from memory, I measure diameter to be about 100 mm (~4 inch)
|
|
|
