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.

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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Awesome!

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That is actually a nice looking wing and I can't stand big Wangs….

Why use other peoples' corner weights instead of just putting your car on a set of scales? I have to imagine you'd be able to find someone to let you borrow a set of scales from.

That is the problem...my car is a roller (blown motor) and there is no one in my small town that has scales. I don't think it is going to make that big a difference as the variance in all the cars is not all that great so an average will work. We all pretty much run the same spring rates anyway and it is based on the average weight of a Z.

You will end up with a wing. :rofl2:

I am trying my best not too. Tracspec vents is supposed to be the end. I want a street car, not a track car. The wife did like that wing though. It is one expensive one. Guess that's why I like it. LMAO.

Honestly, there aren't many wings out there that can claim that they've been track proven in a wheel to wheel racing series like Super Taikyu on the 370Z and 350Z platforms. I think CWEST is maybe the only other one but they never made anything for the Z34. It's definitely a nice kit, I'm considering replacing the end plates with something similar to the Singular pieces Hotrodz is running.

I believe the one APR wing was used in WC. But that wing, you have to make your own uprights.

I like the endplates shown. You're doing right. Don't skimp, get what works and be done with it.

It is function over form. The big end plates aid in moving air more efficiently around the outside of the wing.

Those endplates seem to be pretty effective at increasing downforce without increasing drag and I'm all about that:woot:

Not meaning to jack a thread (I've already sub'd to it), but Eagle, who did you order the Ings+1 wing from? I am looking into getting the regular ZPower wing with the taller uprights.

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

what fender vents?

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

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!

Here are my weights with 200lbs in the drivers seat without the swaybars disconnected. They will be doing this with it disconnect to check the corner balance. She is a hefty girl now. This was a quick throw the scales under it after it was aligned.

LF: 1055 RF:971

LR: 859 RR: 848

Front: 51.27%
Rear: 45.73%

Cross weights: 49.02
Total Weight: 3733lb

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..

Hey dude! I ordered my wing from Corner 3 Motorsports here in So Cal. Just a fair warning its possible it may be a while before your order gets shipped. I would call/PM John Capati there, he should be able to help you.

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!

This is how mine sitting at ZDAYZ 2018. She was too low. 25" front and 25.5 rear. Oh and Rusty with the photo bomb!https://uploads.tapatalk-cdn.com/201...9f431b063c.jpghttps://uploads.tapatalk-cdn.com/201...723c620519.jpg

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Final corner balance numbers. She is a hefty girl with the wheels and R888r's. I did notice a difference in power when I
installed the R888r's before I took the car to MA. I also have the DSS pro level axles and they are heavy. Carrying those things around
was a workout. This is with 200lb's in the drivers seat.

LF: 1036 RF: 984

LR: 885 RR: 832

Front%: 51.4%
Rear% : 45.95

Cross weight %: 50.01
total Weight: 3737

Is your rear interior gutted and the spare tire/tools removed? Comparing your sheet to mine, i see a bunch of weight in the rear of your car.

Noop, full interior. I have 100lbs per side on the rear heavier than you. 200lbs or so total. Like I said, those DSS pro level axles are heavy.

By the way. I have my old corner balance data in the cars glove box. When I pick it up I will be able to tell you how much weight I have gained. Things added, SSR wheels, TT kit, axles, diff cooler, etc.

And also how much weight the driver has gained :icon17:

LOL, 20 lbs.

It has been has been a minute since my last post and I want to thank everyone for all their input. Brendan was spot on with his calculations and understanding. I will be going with Hyperco 350 pound springs in the rear and 800 in the front. I would have gone with a 300 pound springs but Hyperco does not make them in a 7" spring 60mm ID. I don't think it will make to much of a difference as adjustments can be made by adding more rear bar or dropping the front spring weight. Always, chasing a better setup. I have my splitter diffusers and they are pretty awesome lol. I will post pictures as things progress.

That's what he thought for rates? I was feeling like my rates are too soft with aero and you should be putting more down than I am with the bigger splitter and diffusers. Our rates are almost identical after the rear end math.

Here are my pre-corner balance sheet. This is before the TT kit, OS Giken diff, SSR wheels, Diff cooler, DSS Pro level axles. This is with 180lbs in the drivers seat. I was running the factory Nismo wheels with RE11's 285/35/19 front and 325/30/19 rear.


LF: 988 RF: 941

LR: 814 RR: 772

Front%: 54.8%
Rear% : 45.2%

Cross weight %: 49.9
Total weight: 3515



Here are the after numbers.

LF: 1036 RF: 984

LR: 885 RR: 832

Front%: 51.4%
Rear% : 48.6%

Cross weight %: 50.01
total Weight: 3737



I have gained 222lbs total. My weight has added 20lbs. So the car
has gained 202lbs after all of the modifications. Most of the weight gain is in the back
and that is not a bad thing. This is with full interior both times.

I posted a conversion chart in the suspension section for lb/in. to Kg/mm. You may be able to get swift springs in Kg/mm dead on what you need.

Here it is.

http://www.the370z.com/brakes-suspen...ion-chart.html

I'm a bit surprised there is this much discussion on this point but, yep, well known fact that if you remove some of the lever arm advantage the wheel has over the spring (go from bucket to coilover) then you need to reduce the spring rate to maintain the same wheel rate :) .

I have a pretty effective Aeromotions 72" wing and a 2.75-3" splitter and run 20k/9k (rear coilover) with good results. I do run some rake but the ride height is only slightly lower than stock. Lots of front overhang with the splitter and Stillen front end limit me. I don't want to get outside the optimum travel ranges on the suspension anyway.

I saw a huge gain from installing the Trackspec hood vents; more than I expected. Already with a partially boxed 34 row oil cooler, it seems like adding the venting has dropped oil temps by at least 10F.

The next aero mod on the list is adding vertical air dams in front of the wheel arches -adds pressure on the top edges of the splitter, keeps front tires out of the airstream, reducing drag, and reduces wheel arch pressure -reducing lift and improving brake cooling flow, I hope- and splitter fences to box in the splitter ends to keep the air from rolling off the side.

This is the setup I am looking for, I have 21kg front 7kg rear, thinking about 9kg rear before I add aero parts.

here is a nice article regarding choosing spring rates that helped me get started on my build.
How To Choose Spring Rates For Your Car | Speed Academy

Nice!:tup: