Aero and Suspension Tuning With True Type Coilovers

Originally Posted by Elmo370z

Then help me out

Originally Posted by Brendan

This may be the first time I rated a thread 5 stars un-ironically.

Originally Posted by Hotrodz

AJ Hartman is another guy that I found that knows his stuff. All his products are CFD or wind tunnel tested. The first part of this video explains aero loading and spring rates.

Originally Posted by Over_ReV

My car was 3416 lbs with me in it(180lbs) and a 90% full gas tank. Corner weights were
LF- 981 RF- 947
LR- 766 RR- 722

I have true style rears and plan to upgrade the aero this winter so I am also interested in what they come up with for spring rates.

Originally Posted by Hotrodz

So I have been doing some research on adding a rear diffuser to my current setup when I ran across an article/blog on the Professional Awesome Racing website https://professionalawesome.com. After read their article on aero and downforce I decide to shoot them an email to see if their splitter diffuser would be a good addition to my front aero. Long story longer we have exchange sever emails regarding my aero and suspension most significantly my spring rates and the owner Dan O'Donnell provide me with the following information:

So you have a “true type” rear, meaning the spring is directly on the damper body, not in the stock bucket. This has the effect of dramatically increasing the “wheel rate” or effective spring rate at the wheel, if you are using the same spring rate you use previously. If you are running 14k front 12k rear or 800lbs front 700lbs rear, the car will oversteer badly. I just had a long discussion with Savanna Little and Kevin Parlett. They are using a “true type” design as well on similar chassis designs and no suspension manufacture compensates properly for the change.

With your rear wing, I think you can safely add our diffusers and vents, but I would really, really want you to change spring rates to a proper setup. Your system is borderline unsafe in my opinion. Let me know if you want to do the calculations to get the right springs in there. Quick math is lettings me like if you have 14k front springs, you need to be around 5-6k in the rear.

So I am prepared to pay for the his consulting fee as this a steep learning curve for me and at my soon to be power level I don't want to be wadding my car up or possibly hurting anyone else. Here is where I need some help as he needs some information from me to dial the best spring rates for the rear coilovers. I need to provide him with corner weights for the car and obviously right now I have no way to do so. He doesn't need to have actual numbers but just need to be in the ballpark. My car weighs about 3440 with me in it and I am 210 lbs. If any of you have corner weight numbers and your car is of similar weight I would greatly appreciate you providing them to me.

Thank you in advance and go check out the Professional Awesome Racing!

Cheers,
Bob

Originally Posted by Eagle

Excellent thread Bob! The timing is just perfect for me since I'm just embarking on my journey into the realm of real aerodynamics. I'm pretty pleased with the splitter and canards i've got on the car now and after testing at Laguna Seca, I can definitely say that the aero was working. Cant wait for my wing to arrive. Need to read through the material on this site, seems like there's a lot of great info and guidance here. Thanks for sharing and im looking forward to hearing more about the development of your car with Professional Awesome Racing.

Originally Posted by Hotrodz

Glad to hear things went well at Laguna Seca. A front splitter and lowering the car provides for better turn in and cornering grip for sure. Which wing did you get?

Originally Posted by Eagle

I was expecting the car to be a little oversteery but turn in seemed to improve on the faster corners like turn 9 and 6. Corkscrew seemed to have gotten better as well, earlier on the throttle at the exit, flat out.



I'm getting the Ings +1 ZPower Ver. NISMO wing

Originally Posted by Hotrodz

Beautiful wing! You may have to make some adjustments when you add the wing because of the additional rear grip. It may simply add even more traction because your car is well balanced to begin with.

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Originally Posted by 03threefiftyz

I've done all these things...what is is specifically you are asking here? A lot goes into it beyond basic geometry and "aero"? Aero is a wide term...

Originally Posted by Eagle

Yeah i've been told that I may need to stiffen my coilovers a bit more and even go to a higher spring rate if necessary. We'll see once the wing gets here though. Also I completely forgot but i do have my corner balancing numbers for my car and it weighed in pretty close to yours. I'll post those up when i get home so you can compare.

Originally Posted by Eagle

I was expecting the car to be a little oversteery but turn in seemed to improve on the faster corners like turn 9 and 6. Corkscrew seemed to have gotten better as well, earlier on the throttle at the exit, flat out.

I'm getting the Ings +1 ZPower Ver. NISMO wing

Originally Posted by Hotrodz

Yes you have lol. The only thing I have asked for is corner weights from those that are willing to share. I'm just going to use the average of those weights as a jumping off point to get spring rates for my rear true type coilovers. I have learned the key factor between true type or divorced setups and a bucket type is about wheel rate. The aero part is about loading on the springs as it relates to downforce.

The other part of the aero equation for me is the impact on the front aero or splitter and canards. As you know my car is high horsepower so I want to maximize the benefit of the aero I have. As stated previously my question to Awesome Performance Racing is would front splitter diffusers be a benefit to my current setup? That being said the conversation so far has been on spring rates as stated. Once I have that information I think we can talk about aero and what provides a benefit or not and how to setup and test angle of attack and raising, lowering the car and to rear diffuser or not and why. I am all ears and trying to learn the basics of this game and journey down the go fast rabbit hole! Please impart any wisdom you are willing to share.

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