Here's my 11' 6mt S sitting low. I have about a month with them on n still struggling to get a comfort ride. I messed with he preload before installing with out knowing I wasn't suppose too -____- my first time ever installing coilovers. Any suggestions on how to adjust it for a comfort ride. They feel worse the stock. I've messed with the damp but still can't figure out how to get to that comfort. It's my daily n the roads out in NorCal aren't friendly

 

I would suggest searching to see anyone responding to tein flex z questions. And reach out to them and see what they settings they used. I was in the same boat as you and found that all of them have cons. I unfortunately went through several sets before reaching a liveable alternative. Good luck to you though I remember how frustrating it was.

Check this thread for others similar to you https://www.myg37.com/forums/g37-sed...ew-2017-a.html

 

I don't know thaht you will be able to get it comfortable without getting softer springs unfortunately. The spring rates on these are very high. If you want comfort, I've heard good things about the Tanabe S-OCs and the Tein Basis.

 

The Tein Z spring rates are about twice as stiff as stock. Wheel frequencies are still only about 1.3 to 1.4 Hz which should still be acceptable. Stock is about 1.1 Hz. 2.0 Hz is getting into Ferrari territory. I would look at the damping settings if you don't like the ride.

 

My stock suspension is absolutely wonderful and comfortable!

 

Haha smart as! But agree tho

 

I agree with Slarti - since the spring rates are higher (12/10k if i remember correctly), it will be hard to maintain stock comfort levels. Where in the Bay Area are you? I also have a sedan and have been considering the Flex Z coilovers - if you are going to any meets/events, would love an opportunity to ride as a passenger!

Hey Slarti, where did you get info about the stock ride frequencies? I remember you bringing up FCM which is how I discovered ride frequencies and the concept of "flat ride". Would love to know how you came to those numbers for my own knowledge.

 

I paid his consulting fee and we discussed the Bilstein PSS10. In the process, some measurements were taken and he calculated the wheel frequencies for the V36. I have the spreadsheet so I could play around with spring rates and frequencies.

 

I looked at the FlexZ rates again (672/560 lb/in). Front frequency is about 1.4 Hz while rear is more like 1.65 Hz. Good flat-ride numbers but the rear probably kicks a little if the damping is not right and there's more of a tendency for oversteer. Staggered wheels/tires recommended or thicker front anti-toll bar.

 

Def. I'm in the east bay. I'll b in San Jose for this Saturday event

 

3 questions

1. Who did you pay?
2. Would you be able to share this spreadsheet?
3. If no to #2, what are the motion ratios for the shocks and springs front and rear?

 

1) I paid Fatcat Motorsports. Shaikh is the man behind FCM.
2) No, sorry, I'm not allowed to share.
3) I'll have to answer later when I fire up my PC. The front spring and damper motion ratios are the same since they're concentric. Front and rear springs are about 0.5:1, the rear dampers are somewhat closer to unity. 0.6:1? It's not difficult measure, you just have to get each end into the air and wield your trusty tape measure.

 

I'm running the same spring rate and basically, yes, it'll help reduce the amount of understeer inherent in the stock car but it won't get it to oversteer. Making damping adjustments will actually affect understeer positively or negatively. I'm planning on adjusting my camber front/rear to further compensate now that I "think" I'm happy with my damping settings which are a compromise between ride quality and outright handling.

I've been running fairly firm settings for the past month and it's pretty close to dead neutral with my front/rear damping settings but like Slarti said, it'll kick in the rear. So...I've backed off three clicks and I can feel more understeer being introduced. To compensate, I'll double the camber up front and reduce the rear by 2 tenths.

Although I'm using the same spring rate, I am using different dampers (Aragosta Type S with rubber upper mount) and they're very good at taking the edge off. But they are firm. I get a lot of mid corner adjustability with the car and very little in the way of roll or excess body movement. It's not as comfortable as the IPL's suspension when set up on the firm side but it can be dialed way down and then it's almost the same.

With your setup, I'd look at a few things. First, set your preload at zero front and rear, -10mm at most. Second, run the dampers at full soft, halfway to full hard and then 2/3 from full hard. Make sure the dampers aren't just blowing through their damping range on the soft setting and hitting the bump stops. Yours are twin tube so theoretically, they should ride better than a monotube like mine.

What do you have as your damping settings front and rear? Your rears should be softer than your fronts.