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Navara Rear Coil Spring Assistance Kit

25K views 52 replies 15 participants last post by  navmantr4a  
G
#1 ·
Couldn't decide where to put this, so just slapping it in here... feel free to move it Mr Mod

As you all know I have some what of a saggy backside :****
Its been dragging on the floor like a dog with worms for the last few years.

:loser :study: :study: I've been doing my homework for several months, trying to find an alternative to the full leaf / assisted air suspension set up for the Nav.. :study: :study:
The air bags don't float my boat, I certainly didn't fancy adjusting them before and after carrying something, and the mounting points are not the best for such a design imo.
The single load/mounting point for a very low progression leads me to believe they are at fault in the land of Oz for the chassis snapping, no load spread and a very limited absorbency leads to the shock of the road going straight through to the chassis on speed humps or rough roads. The posh version at an extortionate price will allow a compressor driven system to read/adjust the pressure/ride level, but this only reads & adjusts the pressure every 11 seconds... so in other words... :throw

The leaf spring set up on the Navara has been designed to cope with all eventualities but the ride was still not good for a nipper in the rear seat. Stick the best part of a ton of bricks etc in it and it dies!!! :whoopdeedo
I could have gone down the road of heavier load capacity springs, but I like my own teeth to be rigid in my gums.... :D

Soooooo, after months of talking to spring manufacturers, checking out van carrying capacities on coils, I decided this was the way to go.
If you have an Lpoo there are comfort springs available, nothing of such is available for the Navara as Nissan have allegedly designed the all in one suspension for ride quality and weight

I've bought and fitted an assisted coil spring kit, it lifts the Navara to a decent level, uses the rear leaf springs as axle locators when empty and allows the nav to ride on coils. The difference is unbelievable, Its totally transformed the ride quality when empty.
As you start to add load, the coils are progressive, they stiffen slightly and come into play with the leaf springs to allow an assisted ride. I need to do a full measure, but its looking like its lifted my Nav 13cm's at the rear arch from its normal flat saggy stance, that's brought my towball up at the rear-most part 20cm's :eyeroll

I had an issue with one snapped bolt, absolute tw@t to drill out but once that was sorted, the kits a doddle to fit.
Jack up the Nav, Just so the wheels are on the ground but with full suspension travel. DON'T allow the brake hose to get stretched/pulled on. Drop the bottom bolt out of the shock absorber.
Remove the rear chassis bump stop (beware of broken bolts )
Fit the spreader and top spring cup mount to the bump stop location, usint the original bolts and bump stop.
Slip the bottom cup/mount over the U'Bolt, and allow it to saddle the leaf spring.
Pop the spring into place,making sure it sits in the recess/locator... I managed this with my hands and a wooden hammer shaft.
Replace the shocker bolt and move on to the other side....... :clap
There's a link in the kit to adjust the load sensor valve, its literally a bolt on job and adjust the length of the rod...
Job Done!
I don't do recommendations as a rule, but this kit is Highly recommended , good quality with lifetime warranty on the parts if fitted by a professional and stamped warranty card returned to the manufacturer.
Made in Germany, available in the UK by several suppliers, RRP is ÂŁ249.00
The chap I've been dealing with is very interested in supplying forum users, a discount price should be possible if enough people fancy the kit.
Give me a shout if you want one, and when I get a final figure, i'll see what he can do for the number of kits.
 
#27 ·
Hi Biggi,

Thank you for the response. Appreciate the Nav' is a cart sprung truck (rear anyway) was curious if, for the sake of a simple mod' or two I could improve it somewhat.

The wife's car is a Focus ecoboost on 16" alloys and it is so smooth over all surfaces, it tends to show up the gap between the two. I was hoping to narrow the gap a little, accepting I will never equal it :-/
TBH the Nav' replaced a Freelander2 which also rode very well, accepting it's not comparing apples with apples, however memories of my previous 07 Nav' seemed to be of a more comfy ride.

I'm nervous about forking out on new shocks, or custom rear leafs, but... ...watch this space! Well after I've dug around on here for a while longer.

Thanks Harvey
 
G
#28 ·
Harvey...
We have a focus 1800 ghia, the Nav certainly ain't as smooth as that, but it's a lot closer now with the coils on. The shocks haven't made the ride any more harsh, they've just made it more stable.
My daughter rides in the Nav without any travel sick issues now, believe me.. Those springs have made one hell of a difference!
 
G
#29 ·
Bit more of an update on the coils & shocks.
Although the Monroe's allow a significant difference in ride quality compared to the oem, they're not valved to work with the coil springs I have fitted. The Nav handles better and normal ride is superb as I've previously quoted several times. I am however having slight issues with the coils hitting the bump stops due to the Navs leaf springs being totally goofed, so I'm looking at fitting some slightly longer hanging brackets (swinging shackles) to allow the leafs to kick in a little earlier.
This issue only really arises when coming off the speed humps, with a full tank of fuel and some weight in the back (150kg at a guess)
If the Monroe's were a little harder valved, it would probably absorb the drop quicker and stop the Nav hitting the coil stops.
Alternative option I suppose is to remove the bump stops that come with the coil assist kit. The coils haven't sagged any, still got the same wheel arch clearance.
Update later when I've had chance to play about with it. :D
 
#30 ·
what about replacing the leaf springs with heavy duty ones from midland road springs :?:
or have i missed the point
 
#31 ·
What about replacing the springs with normal duty one from midland springs. (Sorry Paul heavy duty will be taller and stiffer) For ride quality you want them to be more supple and if you make them taller then the coils will kick in later due to the springs having further between bump stop and spring top plate.
 
G
#32 ·
Well it's a year (ish) since I fitted the coils, ride height still the same, ride quality just as good, still haven't replaced the rear leaf springs so it does hit the bump stops occasionally but only when loaded and coming off speed humps.
Caravan towing is a dream, no 3yr old vomiting either!!!
The spacers have made a superb handling difference. All in all I love my Nav now. No way will I swap it :D
 
#33 ·
Time to resurrect an old thread, as there are no pictures to look at. Has anyone got the part numbers for the spring assist kit please. I am guessing that what has been done is a progressive coilover, where the standard shock goes.

TIA
 
G
#39 ·
Sorry to resurrect this old thread again, but did you fit these to your Nav nexsuperne?
If so, what did you think to it and how has the truck performed since?

I very tempted to do the same, having two young kids in the back most of the time...
Would like to hear the thoughts of others who completed this mod.
TIA
 
#40 ·
Hi
I fitted these a little while back, they are real easy to fit between chassis and leaf spring, I also fitted a standard set of new leaf springs from milners at the same time.

Image


To be honest I've not really noticed any difference in mine, it still hits the bump stops if I go over a speed hump at any thing around 10 mph or over, whilst carrying approx 200 kgs in the back.
Maybe I'm expecting too much! Or should have gone for the heavy duty leafs.
 
#41 ·
I gave these to my a mate of mine to fit, as he has his own garage with all the tools, 2 post lift etc. A couple of bolts sheered but that was all. He had it for a morning, but wasn't on it for all of that, as he had some proper work to do at the same time on someone elses motor. The ride height came straight up, so the tail is now higher than the front. I haven't (3 months on) got around to fitting the Midland 4+1's that had been mentioned, as it doesn't seem to need it. It definitely corners better, and has better road manners.
 
G
#42 ·
Thanks for the feedback guys, much appreciated.
The picture is also really helpful, as I couldn't totally envisage how this was all put together.

Despite the mix reviews, I think I'll add this to my todo list for the near future. :awesomework
 
#49 ·
Hi Paul
I found fitting instructions a little mucky,
Tried to upload photos last nite with no joy, i'll try again tonite, if you want I can scan to pdf and email to you (maybe better quality), pm me with your email?
Cheers
I'll try to upload again tonite for anyone else who may need
 
#51 ·
I'm sorry to revive this post but my Nav d40 rear springs are sagging a bit as I run about 3/4 loaded all the time and the bump stop is starting to touch on the lumps and bumps in the road and I was wondering what the reviews were on the spring assisters now some have been runing them for a while now (since 2013 start of the thread). I'm not sure about puting heavy duty uprated springs on it as I do from time to time empty it out and take it on holiday with the wife. As we all know how our other half's like to complain about an uncomfortable drive and car sickness ensues!! (phew managed to avoid the obvious pun there) so if anyone can tell me how their Nav is performing now they have fitted them for a while and if there is any issues with the assister kit i.e chassis stress cracks etc.OR would I be better fitting the HD springs?

Gavin