Aero and Suspension Tuning With True Type Coilovers

Spec Jay · 07-20-2019, 01:50 PM

Very interesting thread

If I remember right, SPL says that going from OEM bucket to true type increases effective spring rate by 1.66.

Currently running a custom front splitter with air dam with around +.5 degree AOA with 3" of protrusion. Rear wing is a Aeromotions 72" (DO NOT BUY. It works well but a **** company.) with 6 degreesl AOA. Spring rates are 14k F rear 12k in OEM bucket.

So if I went to a true type I'd need somewhere around 7.2kg springs to maintain the current balance.

Balance of the car is setup to understeer slightly right now. with a degree less in the wing it was almost perfectly balanced.

I was running these spring rates without aero and now with. I definitely feel that I could use a bit more rate purely going off my amateur seat of pants feel.

Here's SPL's spring size calculator but it's where I grabbed the info about the spring location modifier (spring motion ratio)
http://www.splparts.com/content/SpringCalculator.xls

Hotrodz · 07-20-2019, 03:03 PM

Quote:

Originally Posted by Spec Jay

Very interesting thread

If I remember right, SPL says that going from OEM bucket to true type increases effective spring rate by 1.66.

Currently running a custom front splitter with air dam with around +.5 degree AOA with 3" of protrusion. Rear wing is a Aeromotions 72" (DO NOT BUY. It works well but a **** company.) with 6 degreesl AOA. Spring rates are 14k F rear 12k in OEM bucket.

So if I went to a true type I'd need somewhere around 7.2kg springs to maintain the current balance.

Balance of the car is setup to be slightly neutral right now. with a degree less in the wing it was almost perfectly balanced.

I was running these spring rates without aero and now with. I definitely feel that I could use a bit more rate purely going off my amateur seat of pants feel.

Here's SPL's spring size calculator but it's where I grabbed the info about the spring location modifier (spring motion ratio)
http://www.splparts.com/content/SpringCalculator.xls

Thanks for the info as it is in line with much that has been posted. I am definitely running way to much rear wing for the my GT 300. I will be starting over as Daniel recommended: " Dial the center of the wing so the angle is actually more like -5 degrees to start with (with the front slightly higher than the rear of the wing), so it’s being used at its most efficient. Then, check for high speed understeer/oversteer and adjust from there.

If it has high speed understeer, lower the front of the car. If it has oversteer, maybe take the main plain of the wing to 0 degrees (parallel to the ground). If it still oversteers, raise the front of the car to reduce front down

I enjoy following you on Instagram!

Spec Jay · 07-20-2019, 05:44 PM

Quote:

Originally Posted by OptionZero

what fender vents?

they look a hell of alot like the 2020 GTR NISMO's...

I got it from a guy on instagram, username https://www.instagram.com/n00dler

Quote:

Originally Posted by Hotrodz

Thanks for the info as it is in line with much that has been posted. I am definitely running way to much rear wing for the my GT 300. I will be starting over as Daniel recommended: " Dial the center of the wing so the angle is actually more like -5 degrees to start with (with the front slightly higher than the rear of the wing), so it’s being used at its most efficient. Then, check for high speed understeer/oversteer and adjust from there.

If it has high speed understeer, lower the front of the car. If it has oversteer, maybe take the main plain of the wing to 0 degrees (parallel to the ground). If it still oversteers, raise the front of the car to reduce front down

I enjoy following you on Instagram!

I definitely have more wing than necessary too, mine is just one slot up from minimum. I need to redo my front splitter to make it protrude 5" and figure out a way to run some splitter diffusers so I can take better advantage of my wing.

https://professionalawesome.com/prod...iffusers-pair/

I like it balanced to have to slight understeer just cause it makes me a little more comfortable getting on the go pedal on corner exit. you may like it since you and I have more than enough power to correct understeer with go pedal haha.

Right now I have a 0.5" of rake. It made a huge difference from when I initially did the aero. Heres a before and after. Granted it's on the front straight but it gives a good visual about how suspension and aero settings work at balancing the car. Wing was set at the middle setting around 10 degrees front had a positive 3 or 4 on the splitterwithout the air dam and zero rake. Was terminally understeer heavy.

Thanks for the compliments!

Hotrodz · 07-20-2019, 07:12 PM

Quote:

Originally Posted by Spec Jay

I got it from a guy on instagram, username https://www.instagram.com/n00dler

I definitely have more wing than necessary too, mine is just one slot up from minimum. I need to redo my front splitter to make it protrude 5" and figure out a way to run some splitter diffusers so I can take better advantage of my wing.

https://professionalawesome.com/prod...iffusers-pair/

I like it balanced to have to slight understeer just cause it makes me a little more comfortable getting on the go pedal on corner exit. you may like it since you and I have more than enough power to correct understeer with go pedal haha.

Right now I have a 0.5" of rake. It made a huge difference from when I initially did the aero. Heres a before and after. Granted it's on the front straight but it gives a good visual about how suspension and aero settings work at balancing the car. Wing was set at the middle setting around 10 degrees front had a positive 3 or 4 on the splitterwithout the air dam and zero rake. Was terminally understeer heavy.

Thanks for the compliments!

You can definitely tell the second photo the car is in more neutral stance. You and I are on the same trajectory. I had my splitter custom built and it is 5" it is at 0* and I also run at 0.5" of rake. I need to lower my ride height. The car handled a lot better at 26.5" rear and 26" front. I will be ordering the splitter diffusers from him the next week. He running some number for me right now..

Spec Jay · 07-21-2019, 05:04 PM

Quote:

Originally Posted by Hotrodz

You can definitely tell the second photo the car is in more neutral stance. You and I are on the same trajectory. I had my splitter custom built and it is 5" it is at 0* and I also run at 0.5" of rake. I need to lower my ride height. The car handled a lot better at 26.5" rear and 26" front. I will be ordering the splitter diffusers from him the next week. He running some number for me right now..

Did you guys decide on spring rates?

my ride height was solid before I went to the taller Nexen tires. Used to have 3" of clearance with the front splitter. now its closer to 3.75-4 lol.

I want to order them too but realized my oil cooler fittings are going to be in the way I think. I gotta find out how deep the scoops get on the diffusers.

Hotrodz · 07-21-2019, 09:22 PM

Quote:

Originally Posted by Spec Jay

Did you guys decide on spring rates?

my ride height was solid before I went to the taller Nexen tires. Used to have 3" of clearance with the front splitter. now its closer to 3.75-4 lol.

I want to order them too but realized my oil cooler fittings are going to be in the way I think. I gotta find out how deep the scoops get on the diffusers.

Dan has been of vacation so I am hoping to hear something this week. I will let you know how things work out for me. I will probably start on this next month or in September.

3" to 3.5" inches seem to be just about right!

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