Underbody Panel Effectiveness...

[bfeeney]

Thanks for the replies everyone. Maybe I should have started with a different question rather than a question about a solution. Does anyone else feel the steering starting to get loose at 80mph? It feels like the front end is lifting a tiny bit and I start loosing that tight steering feel

[HKz]

how hard or sharp are you turning..? I regularly take highway loops at 80+ and I don't feel like I'm losing control of the front end even when it goes over uneven expansion joints...plus naturally steering feel should get lighter at higher speeds or am I missing something here.

[bfeeney]

Originally Posted by HKz

how hard or sharp are you turning..? I regularly take highway loops at 80+ and I don't feel like I'm losing control of the front end even when it goes over uneven expansion joints...plus naturally steering feel should get lighter at higher speeds or am I missing something here.

No turns, just straight line 80+. If that's the way cars are suppose to be then maybe I was missing something. It just feels a little less grippy up there. Maybe I'll just drive slower lol

[Bonburner]

Originally Posted by bfeeney

No turns, just straight line 80+. If that's the way cars are suppose to be then maybe I was missing something. It just feels a little less grippy up there. Maybe I'll just drive slower lol

Toss a front splitter and some canards on, that should add the downforce you're looking for at high speeds.

[86league]

Originally Posted by bfeeney

No turns, just straight line 80+. If that's the way cars are suppose to be then maybe I was missing something. It just feels a little less grippy up there. Maybe I'll just drive slower lol

If it's feeling noticeably less grippy at only 80, I'd make sure the basics are right before adding downforce.

How's the alignment?

[RayRay88]

Originally Posted by bfeeney

Thanks for the replies everyone. Maybe I should have started with a different question rather than a question about a solution. Does anyone else feel the steering starting to get loose at 80mph? It feels like the front end is lifting a tiny bit and I start loosing that tight steering feel

Lets start with alignment specs, tire pressures and tires.

[Ernest72]

Originally Posted by jflogerzi

I am starting to get all the pieces for a flat bottom why because racecar. So far I have the following

Splitter up front
OEM Under Panels
Verus Trans Tunnel and rear Suspension covers

Just need the diffuser and diff cover

If you are tracking some of those panels could lead to heat building up in your rear diff because it does not get any air, do a search on it. On the street it’s not likely an issue,

[bfeeney]

I just got the car a few weeks ago, so I haven't really done anything to it yet. It came with 235/40-18 up front and 265/35-18 in the back. I forget the name of the tires, but they're brand new and Z rated. Stock suspension, TRD swaybar.

[Pat]

Well there's your problem. Put the same size tires on all four corners and report back.

[NoHaveMSG]

Originally Posted by bfeeney

I just got the car a few weeks ago, so I haven't really done anything to it yet. It came with 235/40-18 up front and 265/35-18 in the back. I forget the name of the tires, but they're brand new and Z rated. Stock suspension, TRD swaybar.

I bet that car had other mods and they returned it to mostly stock before selling. I’d start with alignment.


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[bfeeney]

Originally Posted by NoHaveMSG

I bet that car had other mods and they returned it to mostly stock before selling. I’d start with alignment.


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It did come with the wheels, TRD swaybars, TRD catback, Crawford intake spacers and HKS air filter. I'll get an alignment here soon.

[86TOYO2k17]

Originally Posted by Pat

Well there's your problem. Put the same size tires on all four corners and report back.

They are same diameter. Just different width.

[86TOYO2k17]

I had the following, did wonders for high speed stability.

Greddy Gracer Front Lip
Beatrush Undertray
JDM Aero Underpanels
OEM 86 Rear Spoiler
Verus Front Wheel Deflectors
Verus Trans Tunnel Covers
Verus Rear Aero Spats
FT-86 Speedfactory Rear diff covers
FT-86 Speedfactory Rear Diffuser
TRD Front Fender Fins
TRD Trunk Stabilizer cover
TRD Aero Turbulator
STI Side Skirts

The rear diff is still relatively exposed, but i did have rear diff cover with extra capacity and “heatsink fins”

[Pat]

Originally Posted by 86TOYO2k17

I had the following, did wonders for high speed stability.

Greddy Gracer Front Lip
Beatrush Undertray
JDM Aero Underpanels
OEM 86 Rear Spoiler
Verus Front Wheel Deflectors
Verus Trans Tunnel Covers
Verus Rear Aero Spats
FT-86 Speedfactory Rear diff covers
FT-86 Speedfactory Rear Diffuser
TRD Front Fender Fins
TRD Trunk Stabilizer cover
TRD Aero Turbulator
STI Side Skirts

The rear diff is still relatively exposed, but i did have rear diff cover with extra capacity and “heatsink fins”

High speed stability can be achieved with exactly zero of those modifications. That said, I would love to drive a car with all of those modifications to compare it directly to one without. I'm skeptical I would feel any difference.