Aero and Suspension Tuning With True Type Coilovers

SS_Firehawk · 07-06-2019, 12:45 PM

Honestly, you should be ordering your spring rates based on how much downforce your car is going to produce at certain speeds. A bucket type coilover system, the spring is far closer to the hinge, so it needs a lot more spring weight to compensate. Running a true style, without aero, 6k is on the mark based on my research. I might want to bump it up to a 7k to compensate for your aero. Just my 2 cents. It would probably settle down the rear a lot powering out, under braking and on bumpy surfaces or rumble strips.

It sounds dumb, but chassis tuning on Forza, I drop the damper and spring rates a lot to settle rear down and add a bit of toe in. It's not real life, but I'd imagine the logic is the same.

Edit: Totally wrote this blind and happy others kind of confirmed my thoughts. I run stock Nismo aero and Swifts. I'm basic lol.

Hotrodz · 07-06-2019, 01:57 PM

Quote:

Originally Posted by SS_Firehawk

Honestly, you should be ordering your spring rates based on how much downforce your car is going to produce at certain speeds. A bucket type coilover system, the spring is far closer to the hinge, so it needs a lot more spring weight to compensate. Running a true style, without aero, 6k is on the mark based on my research. I might want to bump it up to a 7k to compensate for your aero. Just my 2 cents. It would probably settle down the rear a lot powering out, under braking and on bumpy surfaces or rumble strips.

It sounds dumb, but chassis tuning on Forza, I drop the damper and spring rates a lot to settle rear down and add a bit of toe in. It's not real life, but I'd imagine the logic is the same.

Edit: Totally wrote this blind and happy others kind of confirmed my thoughts. I run stock Nismo aero and Swifts. I'm basic lol.

You are not wrong! That being said if your suspension is not set properly the influences from the aero can have significant impact on handling and that is why he stated that with the spring rates I am currently running and the downforce from the wing will cause the car to oversteer significantly because you are loading the rear of the vehicle and unloading or adding lift to the front of the vehicle. The fix will allow me then to do aero tuning that I need to maximize front and rear aero.

So my initial question to Danial at Awesome Performance Racing was did he think adding front splitter diffusers would be beneficial with my current setup and the whp I will be running in the future? He initially said no and then after I sent him information on my coilovers, he provide the information I posted and he asked me for some data so he could figure out the best spring rates for my Z. He specifically asked for corner spring weights and for me to give him the spring lengths front and rear when the car is unloaded and then compressed as this all matters when considering spring weight and drupe. The other thing to consider is that if your wheel rates are off you can over work your rear diff. This maybe one of the reasons some have issues with overheating their rear diff at the track or on canyon roads.

I figure if he wants to help me fine tune my car setup I am going to listen and take in all the information I can. His credentials and the people race team he works with speaks volumes. Oh and he said the diffusers would be beneficial.

Elmo370z · 07-07-2019, 04:32 PM

Quote:

Originally Posted by Hotrodz

You are not wrong! That being said if your suspension is not set properly the influences from the aero can have significant impact on handling and that is why he stated that with the spring rates I am currently running and the downforce from the wing will cause the car to oversteer significantly because you are loading the rear of the vehicle and unloading or adding lift to the front of the vehicle. The fix will allow me then to do aero tuning that I need to maximize front and rear aero.

So my initial question to Danial at Awesome Performance Racing was did he think adding front splitter diffusers would be beneficial with my current setup and the whp I will be running in the future? He initially said no and then after I sent him information on my coilovers, he provide the information I posted and he asked me for some data so he could figure out the best spring rates for my Z. He specifically asked for corner spring weights and for me to give him the spring lengths front and rear when the car is unloaded and then compressed as this all matters when considering spring weight and drupe. The other thing to consider is that if your wheel rates are off you can over work your rear diff. This maybe one of the reasons some have issues with overheating their rear diff at the track or on canyon roads.

I figure if he wants to help me fine tune my car setup I am going to listen and take in all the information I can. His credentials and the people race team he works with speaks volumes. Oh and he said the diffusers would be beneficial.

Then help me out

Hotrodz · 07-07-2019, 07:15 PM

Quote:

Originally Posted by Elmo370z

Then help me out

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.

Elmo370z · 07-07-2019, 09:59 PM

Quote:

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.

Thanks. I’m going to use eddies go pro and try to capture some live data using yarn and tape to see how the fender vents and hoods vents work. Before going with aero and coil overs.

Over_ReV · 07-08-2019, 07:28 AM

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.

Hotrodz · 07-08-2019, 08:19 AM

Quote:

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.

Thank you sir and I will be adding aero settings after getting spring rates figured out.

07-06-2019, 12:45 PM	#1 (permalink)
SS_Firehawk A True Z Fanatic Join Date: Oct 2011 Location: Tampa Posts: 4,142 Drives: 13' Magma Red Nismo Rep Power: 7336	Honestly, you should be ordering your spring rates based on how much downforce your car is going to produce at certain speeds. A bucket type coilover system, the spring is far closer to the hinge, so it needs a lot more spring weight to compensate. Running a true style, without aero, 6k is on the mark based on my research. I might want to bump it up to a 7k to compensate for your aero. Just my 2 cents. It would probably settle down the rear a lot powering out, under braking and on bumpy surfaces or rumble strips. It sounds dumb, but chassis tuning on Forza, I drop the damper and spring rates a lot to settle rear down and add a bit of toe in. It's not real life, but I'd imagine the logic is the same. Edit: Totally wrote this blind and happy others kind of confirmed my thoughts. I run stock Nismo aero and Swifts. I'm basic lol. Hotrodz likes this. __________________ Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI New Car: Under Construction Last edited by SS_Firehawk; 07-06-2019 at 12:54 PM.

07-08-2019, 07:28 AM	#6 (permalink)
Over_ReV Base Member Join Date: Jun 2013 Location: Ohio Posts: 43 Drives: 10 370z Rep Power: 123	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. Hotrodz likes this.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
[FOR SALE] Fortune auto 500 coilovers (true rear type) SOCAL	royvaldizno	Parts for sale (Private Classifieds)	35	03-29-2018 11:40 AM
[WTB] True Type coilovers	scope22	Parts for sale (Private Classifieds)	0	12-20-2017 04:09 PM
Looking to get true type coilovers	scope22	Suspension/Brakes	0	12-20-2017 11:50 AM
Stance XR1 vs. Fortune Auto 500 True-Type Coilovers	ZahyMatar	Brakes & Suspension	7	06-08-2017 12:15 AM
True-type coilovers	AdamMD	Wanted	2	07-01-2015 03:18 PM