BogMonster Posted September 22, 2009 Share Posted September 22, 2009 What are the views on the suitability of fitting Discovery Tdi rear springs onto a Discovery 2? Availability is the key (i.e. the D2 springs aren't) - this is as a potential replacement for a set of deflating air springs but all that is available right now is D1 rears, I'm not sure how the rear axle weight compares from a D1 to D2 at typical kerb weight - I have the max rear axle weights somewhere but that doesn't really help. Any thoughts please? Would it work or not? Type approval blah is not an issue all I need to know is whether it would sit at about the right ride height. Quote Link to comment Share on other sites More sharing options...
nicks90 Posted September 23, 2009 Share Posted September 23, 2009 wish i could give you some useful info - but i have been searching high and low for the spring rates and lengths for D2 rear springs (coily versions) for some time with zero success. I bet their aint much difference between a D1 heavy duty rear spring and a normal D2 rear spring - as the D2 is a bit heavier but both appear to have about the same ride height........ Quote Link to comment Share on other sites More sharing options...
bluespanner Posted September 23, 2009 Share Posted September 23, 2009 Wouldn't put it past BMW to have altered the spring diameter fractionally... Quote Link to comment Share on other sites More sharing options...
BogMonster Posted September 23, 2009 Author Share Posted September 23, 2009 The springs will physically fit as some people have converted them using 90 spring plates. It's just the free length / poundage and the consequent ride height that I am uncertain about. I'm guessing it will probably be OK as the D2 is probably only the same as a D1 with a fat person in the back but I don't want to get the springs on there and find out it drags its butt along the road like a 20 year old Range Rover on its original springs. Quote Link to comment Share on other sites More sharing options...
nicks90 Posted September 24, 2009 Share Posted September 24, 2009 be a trail breaker bogmonster - get some disco1 standard, HD and milly rear springs from your local parts supplier on a sale and return basis and try all 3 out and see what ride height they sit at compared to normal disco2 air bags and post the results back. afterall, its the at rest ride height thats most important and should give a general indication of if they`re about right. yeah i know, poundage and length affect ride height - but there aint alot of difference in free length between the springs above, jsut poundage so should give us a fair idea of compatibility. Quote Link to comment Share on other sites More sharing options...
disco_al Posted September 24, 2009 Share Posted September 24, 2009 From my Kilen spring book, we have the following data; Disco 1 Dt 16.50 Dy 154 L0 427 (Not sure what the Dt & Dy are, but i'm guessing the L0 is length) Disco 2 RH Dt 16.50 Dy 151 L0 396 Disco 2 LH Dt 16.50 Dy 151 L0 400 So from that, i suspect that the Disco 1 springs will give you approx a 1" rear lift. Kilen ones are available at the moment too 69061 &69062 are the part numbers. Quote Link to comment Share on other sites More sharing options...
q-rover Posted September 24, 2009 Share Posted September 24, 2009 Why not just replace the airsprings? Quote Link to comment Share on other sites More sharing options...
teabag Posted September 24, 2009 Share Posted September 24, 2009 Why not fit the D2 rear coil springs instead of D1's Quote Link to comment Share on other sites More sharing options...
disco_al Posted September 24, 2009 Share Posted September 24, 2009 Availability is the key (i.e. the D2 springs aren't) Quote Link to comment Share on other sites More sharing options...
BogMonster Posted September 24, 2009 Author Share Posted September 24, 2009 1) why not use D2 air springs - because we don't have any air springs here it will take a month to get them ex UK and cost a fortune 2) why not use D2 coil springs - see 1) Quick solution required before the air suspension compressor gets bored with a duty cycle 20x what it was designed for and lets the smoke out! Thanks Al Quote Link to comment Share on other sites More sharing options...
disco_al Posted September 25, 2009 Share Posted September 25, 2009 no problem Quote Link to comment Share on other sites More sharing options...
q-rover Posted September 25, 2009 Share Posted September 25, 2009 Ahh, yes. Forgot where you are... Quote Link to comment Share on other sites More sharing options...
teabag Posted September 25, 2009 Share Posted September 25, 2009 As above Quote Link to comment Share on other sites More sharing options...
cipx2 Posted September 25, 2009 Share Posted September 25, 2009 D2 rear coil spring data from the manual: If you'll compare the pre 04 MY D2 spring data to the D1 springs http://www.members.shaw.ca/jbarge/springinfo.html#OEM and http://members.shaw.ca/red90/NRC8044_5.html you'll see they closely match except the wire diameter, 16.5 vs 15.2. So the D1 spring rate is smaller. I don't know how much the D2 rear will sag with the D1 springs (say 1 inch?). It will certainly feel bouncier and they will bottom out sooner. You can fit spacers to correct the ride height if you have or can fabricate some (even from hard wood - boil them in oil and they will last a couple of years). I would consider this as a temporary fix until the next ship can bring an original D2 set. Quote Link to comment Share on other sites More sharing options...
BogMonster Posted September 26, 2009 Author Share Posted September 26, 2009 Cheers. That was what I thought would be the case. Time to see what the owner wants to do.... (fix it and sell it is the answer I think!) Quote Link to comment Share on other sites More sharing options...
nicks90 Posted September 28, 2009 Share Posted September 28, 2009 shame it doesnt have the spring rates in there.... Quote Link to comment Share on other sites More sharing options...
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