5 or 6.5 inch hybrid pads?

**ymc226** · 06-11-2015, 10:44 AM

Moving up from the PC and am only a weekend enthusiast doing my family's 5 cars (some with curves Porsche 911 upto a large suburban).

I'm going to order the Flex 3401 either alone and use the 5.5 backing plate along with the 6.5 pads but am concerned that it would be hard to get good results on the 911 or the Cayenne. Also have a Range Rover and Defender that are boxy and could take the 6.5 pads.

The Flex also comes in a kit that includes the micro 4 3/8 inch backing plate that will accept 5 inch hybrid pads. Would you think this setup is necessary to get good results on my more curvy cars?

Also how easy is it to change backing plates on the fly going between these 2 plates?

**rms64** · 06-11-2015, 10:46 AM

Originally Posted by ymc226

The Flex also comes in a kit that includes the micro 4 3/8 inch backing plate that will accept 5 inch hybrid pads. Would you think this setup is necessary to get good results on my more curvy cars?

Maybe not "necessary" but IMHO I don't think you'd regret it. Since the Flex is a forced-rotation machine, it's easier to have the machine "walk" on you with the bigger pads. I'd highly recommend the 5" hybrids!

Congrats on the new Flex!

**Ccrew** · 06-11-2015, 10:50 AM

You won't regret the smaller pads, but the interchangeable backing plates seem to have gone the way of the DoDo. You can get the smaller Lake Country plate, but it's still a wrench change to swap out. I was told when I ordered mine a few weeks ago that they'd had issues with the larger size.

Kind of neuters the "quick change" aspect of it IMHO, but for me I have the Rupes 15 so I can use the smaller pads on both machines.

**trekkeruss** · 06-11-2015, 10:52 AM

Originally Posted by ymc226

The Flex also comes in a kit that includes the micro 4 3/8 inch backing plate that will accept 5 inch hybrid pads. Would you think this setup is necessary to get good results on my more curvy cars?

If you're worried about a bigger pad stalling like it might with a PC, as mentioned above, the FLEX is forced rotation; it will spin regardless or the panel's shape.

**Ccrew** · 06-11-2015, 11:01 AM

Originally Posted by trekkeruss

If you're worried about a bigger pad stalling like it might with a PC, as mentioned above, the FLEX is forced rotation; it will spin regardless or the panel's shape.

Yeah, but a smaller pad will conform to the curves better.

**ymc226** · 06-11-2015, 11:12 AM

Thanks for the quick responses. I'll get both sizes and maybe use the smaller on the more curvy cars so will change plates only between cars.

**emmjay** · 06-11-2015, 11:15 AM

i got both 6.5 and 5, Used the 6.5" on the hood and then tried the 5" on the roof. Never touched the 6.5" after that. The 5" is just a lot smoother.

Also, if i'm not mistaken, the 5" hybrids work with the LC 4" changeable plate and not the 4 3/8 from flex...

**ymc226** · 06-11-2015, 11:31 AM

Originally Posted by emmjaygti

i got both 6.5 and 5, Used the 6.5" on the hood and then tried the 5" on the roof. Never touched the 6.5" after that. The 5" is just a lot smoother.

Also, if i'm not mistaken, the 5" hybrids work with the LC 4" changeable plate and not the 4 3/8 from flex...

That's an important point and not entirely obvious. I may have to change my order from the Flex micro plate to the LC 4 inch plate. Will the LC 4 plate overheat easily on the Flex?

**aim4squirrels** · 06-11-2015, 12:48 PM

Originally Posted by ymc226

That's an important point and not entirely obvious. I may have to change my order from the Flex micro plate to the LC 4 inch plate. Will the LC 4 plate overheat easily on the Flex?

Not in my experience at all. I have the older dual plate system from LC, and I just spent the better part of 3 days buffing out my car (there well be a thread about it later, not done yet.)

I used both plates and both sizes of the hybrid pads and yes, the smaller pads run crazy smooth, but the larger pads are not uncontrollable by any means. The larger backing plate from LC is actually a bit larger than the backing side of the 6.5" hybrid pads, so the stock flex plate will probably work just fine with them, especially for the firmer orange and white pads.

I can only speculate on why the larger plate has a higher failure rate, but my guess after using it with last week is that the larger pads are more sensitive to tilting of the machine improperly (buffing at a slight angle, which the Flex doesn't like as much) and this creates a bit more force on the mounting point. That combined with heat (just try touching that bolt after a couple hours of buffing to swap plates and you'll know what I mean) takes it's toll on the backing plate mounting section.

It's also possible the two spacer washers you're supposed to use between the adapter plate and the swappable plate allows a bit too much flex of the larger swappable plate, but without then you'd likely grenade the plate far more quickly as it won't have any space to give when bearing down on it at any angle, which despite everyone's best intentions is bound to happen. That larger plate has to have some give, and room to more.

The other possibility: operator error in not installing the spacer washers.

**emmjay** · 06-11-2015, 12:54 PM

It was just the bigger plate in the system which had the problems, not the smaller 4" plate.

Also, last I checked, the bigger plate is no longer available in the kit, all you get is the smaller 4" plate - see below. Price is also lower now. I paid close to $50 for the old set of two plates. As I have no need for the massive plate, its still in the plastic in the back of the cupboard.

The stock flex backing plate and this 4" plate should be all that you need (IMO).

FLEX XC3401 Changeable Backing Plate System