While you can cut the coil, what I would do is by the coil over kit which requires the groove to be cut in the shock. Maybe you will get lucky and one of the grooves you already have will work or a machine shop can add the groove for you. the fixed posistion seat you have is held to the shock the same way the adjustable sleeve is. Really anyone with the Bilsteins you have can change them to fully adjustable.Speaking of machining.... I have the Lotus/Bilstein/Eibach setup on my S4s. They are on the lower suspension height, which is at least as high as stock. The front is still a bit high for my liking. Would it be possible to take the front shocks to a machine shop and have another groove added to lower them, or would it be easier to just have a machine shop trim just a bit off the springs?
I have read everthing possible on the Protech's, and haven't found anyone really singing its praises. but the guys with Bilsteins are in LOVE! What people are saying about the Bilstein's is similar to my past experience with them. I already have GAZ shocks on my car and read the same guy designed the Protech and GAZ. The only twin tube shock that really impressed me was Koni. Bilstein is a mono tube design which does have some advantages. I know on paper a fully adjustable shock sounds great!, but I can adjust my shocks all day long and I still can't get the ride quality I am looking for. Another cool trick you can do with Bilstein's is welding a schrader valve into the base which allows you to vary the nitrogen pressure.Never trim the spring -- well known fact. You will not be happy with the ride if you do that.
There are companies that can make any spring you want to order for about $300 a pair. I did that for a car and they worked/fit great.
As cool as it is to have Bilsteins, that's a lot of work and bother for about the same cash as the Protechs that are fully ride and dampening adjustable.
Sent from AutoGuide.com App
You will not be able to lower them much by doing this as you have to allow for the bottom spring platform getting closer to the bottom arm as it moves. IIRC there's only about 10 mm of clearance on the lower platform setting at normal ride height and you might loose half of this during movement. You would need to let the arm travel (with the spring removed) from full damper extension to full compression to ascertain the minimum clearance required.....I have the Lotus/Bilstein/Eibach setup on my S4s. ........ Would it be possible to take the front shocks to a machine shop and have another groove added to lower them........?
I wouldn't know how to add this but will provide a how to and part needed once I have tested this out.Great Job LANTANA TX! Keep diggin...you may want to add those to our Lotus Xreference List to help out the community.
Excellent updates. I was really excited to see the factory lotus upgrade but for their cost and product line used, I was disappointed. Thanks again.
If you look at the picture, you will see a found circlip. this is pushed down over the the shock body and snaps into a groove. It does not fit flush with the shock body but sticks out a little. then the threaded tube is pushed down over this circlip and snaps into place. This is also how the non adjustable lower spring pad fits on the Lotus/Bilstein shock. I am still learning as I go, but I believe that some of the stock upper parts are used at the top and not the top mount that comes with the kit. I will find out when I go to install them. I should have the parts and ready to install by next weekend.A how-to and parts list would be a great service. I am not familiar with using these coil-over add-on kits and would like to get an explanation of how they operate and what is necessary to install them. I'm not clear on how they are fixed to the shock tube to form the lower perch for the spring.
I have heard conflicting informaiton about is the groove is already in the shock or has to be machined. Also not sure about the top mounting. I haven't taken my shocks off yet but it looks like you resuse the stock upper parts. I will find out soon.Thanks! I understand - so the shock tube does not require any machining. And what about at the top? The cone shaped piece looks like it is meant to slip over the rode end of the shock (I' guessing). Does it articulate with the rubber boot which cushions the top of the OEM shock? Or does it substitute?
I'll sing the praises of the ProTechs. I had Bilstein PSS9 on my 996 Porsche, and they weren't any better than the ProTechs on my Esprit. In fact, the Bilsteins on the front cluncked like crazy unless you put the stiffness setting way up.
I love the way my Esprit rides and corners with ProTechs.
Thank you! Great information that I wish I had sooner. I had to figure out most that on my own, but it looks like I am in the ballpark. I decided to go with 13" long springs that are 225# front and 250# rear which looks close to the S4/S4s. I also think this is close to the V8 springs. I went with these rates because I am going to V8 size wheels and tires and will be installing a V8 (Ford DOHC Coyote 5.0 that weighs less than the Lotus V8 engine)I’m a little late to this. I’ve been absent for the past few months with other “stuff” going on.
I see you’ve already bought you’re hardware. I don’t think you’ve installed yet, though, so maybe this info will help still.
The spring rate/length/damper question is more complex than it might seem because Lotus was always fiddling with it to make performance improvements, meet ride height regulations, and adjust oversteer/understeer characteristics. Here are a few specific model specs that might help.
Front: Rate – 22.8 N/mm / 130 Lb/in, Free Length – 369mm, Static Length – 203mm
Rear: Rate – 27.5 N/mm / 157 Lb/in, Free Length – 334mm, Static Length – 205.7mm
Front: Rate – 29.1 N/mm /166 Lb/in, Free Length – 372mm, Static Length – 219mm
Rear: Rate – 27.5 N/mm / 157 Lb/in, Free Length – 347mm, Static Length – 218mm
Front: Rate – 41 N/mm / 234 Lb/in, Free Length - N/A, Static Length – 214mm
Rear: Rate – 45 N/mm / 257 Lb/in, Free Length - N/A, Static Length – 227mm
The front damper platform height for each of these measurements is 59mm. The rear platform height is 115mm.
The extended/compressed length for the front is 12in./10in., and the rear is 16in./12in.
I hope this helps.