Rebel Racing Coil Overs Options

[Biggles]

I’ve bought a set of rebel racing adjustable perches to go over my rear bilstein dampers.

Unfortunately, for the duel rate springs I have (tender and main spring), the isolator collar (between the two springs) ID at 54mm is just too small to go over the OD of the threaded tube, meaning I have to go up in spring size to 60mm ID I think

Question: what ID springs do people use with this Rebel Racing set up and do you find the springs rub on the threaded tube ?

See below

Thanks, Chris

[wysri9]

I am about to install the Rebel Racing Coilovers with 150lb Eibach springs. No helper springs though - can somebody explain the benefit of the helper springs?? Am I missing a trick here?

Thanks

Simon

[Biggles]

I am about to install the Rebel Racing Coilovers with 150lb Eibach springs. No helper springs though - can somebody explain the benefit of the helper springs?? Am I missing a trick here?

Thanks

Simon

The post above explains it pretty much but like a lot of things, it isn’t a case of just putting anything on your car. It also controls frequency as you go over a bump as the suspension unloads.

I had to get a spring pro to calculate a duel spring equivalent to my 150lbs progressive, fixed perch, set up. He recommended a 300lbs helper/tender spring (this is an eibach spring which has a 1.75” travel (so the free length is around 3.25” ish) with a 160lbs 9” main spring. But this is on a car with a 3.2 and 915 box so will be heavier. Most people have stiffer springs, but for fast road use I think it’s overkill.

The problem with a duel spring set up using the rebel racing system comes when you have to fit the duel perch/isolater plate between the springs when you fit a 2.25” ID spring. The diameter of the perch plate is slightly too small to fit over the threaded tube. I’m ordering a 60mm tender spring + duel perch plate, and hopefully that will be ok to fit over the threaded tube. My main spring is a 2.25” ID but actually measures 60mm so I think I’m going to be ok. Something to bear in mind if you’ve already got a 2.25” ID main spring. I’ll report back, but as I see it, there is a flaw in their design as the tolerance is way too marginal - the movable perch collar should be a larger diameter...

PS I also learnt there are different metal compounds for these springs. I was told you need silicone chrome springs, which don’t sag - Eibach are made this way.