Don:
I have the BPNW set on my car, which is the set I believe you are describing.
The height of the rear increased after the springs were replaced, but I
attribute that to new springs replacing worn, old ones with plenty of fatique.
I don't scrape the bottom on the dip leaving my neighborhood like I used to and
the rear-end squat was nearly eliminated after the change. The front height
remained the same, but cornering is now a different experience. No more
plowing into corners at speed. The car rides much flatter around corners and
with the Nissan LSD, power is more efficiently applied to the wheels, even when
it's wet, to allow for faster acceleration out of the corners. (I have not
been able to fishtail around a corner like I used to since putting in the LSD).
I was also a little curious when comparing the original springs to the
replacement ones, but I decided to trust the engineering and I've really
enjoyed the change.
Andy
CD6521L
CD6746L
> I've purchased some 30% uprated springs and they are supposed to deliver
> a stock ride height.
>
> As compared to the stock springs, the coils on the uprated springs are
> thicker in diameter and there are more coils than on the stock springs.
>
> In the case of the rear springs, both the stock springs and the uprated
> springs are the same height -- both unloaded. However in the case of the
> front springs, the uprated springs are about 3/4" shorter than the stock
> springs.
>
> This doesn't make sense to me. Seems both the front and rear should be
> the same height difference as compared to the stock springs. The rears
> should not be the same height while the fronts are shorter.
>
> The company I bought them from said the uprated springs should be
> shorter than the stock because they are stronger -- which makes sense.
> They then suggested that my stock rear springs should be taller than
> they are, and taller than the uprated springs. They suggested that my
> rear springs have sagged but the fronts have not.
>
> They also said the rear uprated springs make a TR4A ride higher than
> stock but that they didn't think it was true for the TR250. Seems to me
> the TR250 and TR4A are the same. This doesn't make sense to me.
>
> The uprated rear springs are 11" tall and the uprated front springs are
> 9.5" tall.
>
> All measurements and comparisons were made with all springs unloaded --
> out of the car.
>
> I am the original owner, so I know the springs are stock.
>
> Any thoughts/comments would be appreciated.
>
> Thanks,
>
> Don Malling
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