Need my car to launch straight!!

[tanabersx]

Hello guys!
Long story short, I’m on 305 nittos 555r2’s, Apex 19x11 wheels.
Eibach Euro lowering springs. .8” lower I believe. Everything else is stock in suspension.
Around 700whp, Pure 800, PI, IM, Meth stage 1 Pure tranny, DSS axles, etc.
Every time Im roll racing in 2nd, 3rd sometimes in 4th, my car spins and sways badly to the driver side. Its like if I had more power in one wheel ?? than the other.
Ive had it race shop aligned and everything is within specs!
How can I control this?!?!? Is there some SPL arms I should buy to minimize this sway. It’s crazy scary and Ive had some close encounters with my life flashing before my eyes ??.
Appreciate any suggestions.

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[Kolme]

@zrk @physics

 

[tanabersx]

Forgot to mention Ive run Toyo R888R with less HP and MT ET street S/S with this power and the rear end just felt loose while cruising or high speeds with the MT's. Switched to the Nittos 555r2 couple of weeks ago.

 

[Evolution]

SPL rear toe arms with eccentric lockouts. Makes a good difference.

 

[PaulFRDE]

I know nothing about drag strip stuff, but you should share your alignment. Without it nobody can really help you.

 

[tanabersx]

I know nothing about drag strip stuff, but you should share your alignment. Without it nobody can really help you.

I don't have the alignment sheet. ??‍
I also don't do drag strip. Just want it to go straight on the street!

 

[kaj]

When you take a car built for handling and try to make into a drag car, it's gonna be a bit of an uphill battle.
You almost need to take away all that makes the car handle well in order to go straight.
If only you could swap in a sold axle....
From what I'm seeing under these cars, you need to find ways to reduce unwanted articulation. Being lowered, with no idea what the alignment specs are, is probably making it even worse.
Find someone who's done what you are trying to do and copy them.

 

[PaulFRDE]

I don't have the alignment sheet. ??‍
I also don't do drag strip. Just want it to go straight on the street!

In this case I would recommend you to start with an alignment, especially for the rear!
But I will let more knowledgeable people to recommend you the right alignment, especially for toe since you have 700whp.

 

[zrk]

Get good tires, get rid of lowering spring, get an alignment, VSC off.

 

[Cptnslo]

I’m also curious about your tire pressure

 

[zrk]

I’m also curious about your tire pressure

oh yeah. that too.

 

[kyle9]

Could be a rear toe issue.

If you do .15 to .2 rear toe on each side (each side needs to be the same - some shops just looks at total) that will help.

And go back to oem ride height. The lowering springs are messing with your geometry and most likely making the car more sensitive to ride height changes than it was when stock.

 

[tanabersx]

I dont have the alignment sheet. ??‍

Get good tires, get rid of lowering spring, get an alignment, VSC off.

aren’t the nittos nt555r2 considered good tires? What suspension would you recommend? VSC always off

 

[tanabersx]

I’m also curious about your tire pressure

25 psi cold

 

[zrk]

25 psi cold

Lower your tire pressure 20ish psi.

NT555R2s are good tires, but 19s? You should be on 17s with a real side-wall for 700hp+

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