Race Tracking Your Supra - Information exchange

[kungfujedis]

@kungfujedis is that wing you have the 45th anniversary wing?

anybody know if the 45th anniversary wing is functional at all?

Yeah, it's a 45th wing. No idea how much downforce it produces, can't find that info anywhere. Not a lot, I imagine. It is adjustable, and I have it in the track setting. Hopefully it does....something

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[Yli]

Did some test fitting and driving of my tire transport solution in advance of a trip to VIR. So far so good.... 4th wheel will go in the passenger seat.

Which racks are these and how are they holding up?

 

[Rensuhlo]

Theres speculation over how the roof will hold up with those seasuckers, as well as emergency braking. @kungfujedis can you chime in?

 

[kungfujedis]

Theres speculation over how the roof will hold up with those seasuckers, as well as emergency braking. @kungfujedis can you chime in?

I haven't taken them on a long trip yet, but i went on a 20 minute drive of various speeds (up to about 65). I stopped many times to check the adhesion, and they didn't budge. I did some moderate cornering on a cloverleaf and some moderately aggressive braking, no signs of movement. I left them on overnight to see if the suctions would loosen at all, and it didn't. I'll be driving about 4-5 hours to VIR on the 21st with the setup, I won't be using it until then. I'll be sure to update afterwards.

 

[kungfujedis]

Which racks are these and how are they holding up?

https://www.seasucker.com/products/monkey-bars-2020-edition

 

[PowerGetter]

tldr; I'm a novice driver struggling with very abrupt/unpredictable oversteer

Hey guys, I wanted some of you more experienced folks' input here. Earlier in the week, I was at Chuckwalla trying to get a feel for the car after some upgrades/changes I've done over the past few months.

I had a pretty difficult time keeping the Supra composed during medium/high speed corners. The car seems to oversteer way too quickly/abruptly -- I like oversteer, but it feels like the car is on a razors edge once I feel it slip even slightly. I decreased the dampening/rebound a little bit in the rear coilovers to hopefully promote slightly more understeer to balance it out a bit, but it still felt way too unpredictable and twitchy when it'd start to oversteer. I've considered removing my Cusco sway bars and perhaps changing spring rates on my coilovers, but before doing anything too drastic and wasting time, I'd like your input.

Edit: I will absolutely not dismiss the notion or idea that I just don't know how to drive the car with the changes made, driver mod and all that. I have one more track day this year at Buttonwillow and I'm leaning towards keeping the car as is just to get more time with the car and it's setup and make micro adjustments early next year when I'm able to go to the track again.



Mods:

HKS Hipermax R Coilovers
Spring rate N/mm(kgf/mm): Front 137 ( 14.0 ), Rear 196 ( 20.0 )
Dampening/Rebound: Front 22 clicks (30 stiffest/max), rear 15 clicks (30 stiffest/max)

Cusco Front & Rear sway bars
Front: 28mm OD hollow
Rear: 22mm OD hollow

Tires: Yokohama ADVAN AD09 (Square)
295 35 18R

Alignment
Front
-3 Camber
0 toe

Rear
-2 Camber
.22 toe

Just for reference, here's the track. It's a free-flowy track and I feel like shit that I'm struggling so much with the car here.

 

[Rob_SER]

I don't really ave great answers for you, but that's one of the reasons I try to go slow on the upgrades and test between each and everyone of them.

Now that's a lot harder to pinpoint the reason...

Did you get a chance to get a few events with the car before upgrades?

 

[PowerGetter]

I don't really ave great answers for you, but that's one of the reasons I try to go slow on the upgrades and test between each and everyone of them.

Now that's a lot harder to pinpoint the reason...

Did you get a chance to get a few events with the car before upgrades?

I did, 3 track days prior to the upgrades. Upgrades since the prior track event; tires, coilovers, and sway bars. Pretty significant changes, and I do agree to take it slow however there was quite the lul between this previous track day and the one prior. I wouldn't have had the time later in the year to work on the car.

 

[razorlab]

tldr; I'm a novice driver struggling with very abrupt/unpredictable oversteer

Hey guys, I wanted some of you more experienced folks' input here. Earlier in the week, I was at Chuckwalla trying to get a feel for the car after some upgrades/changes I've done over the past few months.

I had a pretty difficult time keeping the Supra composed during medium/high speed corners. The car seems to oversteer way too quickly/abruptly -- I like oversteer, but it feels like the car is on a razors edge once I feel it slip even slightly. I decreased the dampening/rebound a little bit in the rear coilovers to hopefully promote slightly more understeer to balance it out a bit, but it still felt way too unpredictable and twitchy when it'd start to oversteer. I've considered removing my Cusco sway bars and perhaps changing spring rates on my coilovers, but before doing anything too drastic and wasting time, I'd like your input.

Edit: I will absolutely not dismiss the notion or idea that I just don't know how to drive the car with the changes made, driver mod and all that. I have one more track day this year at Buttonwillow and I'm leaning towards keeping the car as is just to get more time with the car and it's setup and make micro adjustments early next year when I'm able to go to the track again.



Mods:

HKS Hipermax R Coilovers
Spring rate N/mm(kgf/mm): Front 137 ( 14.0 ), Rear 196 ( 20.0 )
Dampening/Rebound: Front 22 clicks (30 stiffest/max), rear 15 clicks (30 stiffest/max)

Cusco Front & Rear sway bars
Front: 28mm OD hollow
Rear: 22mm OD hollow

Tires: Yokohama ADVAN AD09 (Square)
295 35 18R

Alignment
Front
-3 Camber
0 toe

Rear
-2 Camber
.22 toe

Just for reference, here's the track. It's a free-flowy track and I feel like shit that I'm struggling so much with the car here.

That is a lot of spring and a lot of comp/rebound. What are your tire pressures?

 

[PowerGetter]

That is a lot of spring and a lot of comp/rebound. What are your tire pressures?

33 PSI hot F/R. Would you suggest starting with the compression and rebound?

 

[rwense]

That’s what I’m talking about! I was thinking it was either the Miata or possibly some GRM arrangement for good publicity but I thought is was suspicious.

I can add to what the others have said. I got to run a set of TAPs after they were used by a similarly setup supra after one day.

They were absolute garbage when it came to getting any grip out of a corner. Again this was AFTER 1 TRACK DAY but still it was wild how little grip there was. That being said, under braking I pulled a tad bit more G compared to the A052s I was running earlier. But that could also be possibly down to the A052s being a 40 sidewall and the TAPs being 35.

Also ran them in the rain for a session and didn't die so I guess thats something ?

 

[FLtrackdays]

tldr; I'm a novice driver struggling with very abrupt/unpredictable oversteer

Hey guys, I wanted some of you more experienced folks' input here. Earlier in the week, I was at Chuckwalla trying to get a feel for the car after some upgrades/changes I've done over the past few months.

I had a pretty difficult time keeping the Supra composed during medium/high speed corners. The car seems to oversteer way too quickly/abruptly -- I like oversteer, but it feels like the car is on a razors edge once I feel it slip even slightly. I decreased the dampening/rebound a little bit in the rear coilovers to hopefully promote slightly more understeer to balance it out a bit, but it still felt way too unpredictable and twitchy when it'd start to oversteer. I've considered removing my Cusco sway bars and perhaps changing spring rates on my coilovers, but before doing anything too drastic and wasting time, I'd like your input.

Edit: I will absolutely not dismiss the notion or idea that I just don't know how to drive the car with the changes made, driver mod and all that. I have one more track day this year at Buttonwillow and I'm leaning towards keeping the car as is just to get more time with the car and it's setup and make micro adjustments early next year when I'm able to go to the track again.



Mods:

HKS Hipermax R Coilovers
Spring rate N/mm(kgf/mm): Front 137 ( 14.0 ), Rear 196 ( 20.0 )
Dampening/Rebound: Front 22 clicks (30 stiffest/max), rear 15 clicks (30 stiffest/max)

Cusco Front & Rear sway bars
Front: 28mm OD hollow
Rear: 22mm OD hollow

Tires: Yokohama ADVAN AD09 (Square)
295 35 18R

Alignment
Front
-3 Camber
0 toe

Rear
-2 Camber
.22 toe

Just for reference, here's the track. It's a free-flowy track and I feel like shit that I'm struggling so much with the car here.

Had the alignment checked recently?
I don’t know that particular track but you can try going softer on your dampening. It’s possible to be loosing some contact patch if set too stiff. Bleeding your tire pressures down as the day goes on is something to consider as well.

 

[i3igpete]

do we need to worry about the DME cutting engine power if it estimates the rear brakes getting too hot? one of my buddies that w2w's a bunch of different bmw's said that was a thing on his cars.

Here is the parameter to code off: E84_FLR - Engine power Reduction (prevent brake disc overheating by reducing engine power)

Change the e84 to e89 probably for your chassis, my chassis is an X1. So it would be E89_FLR in your XDSC module.

https://www.e90post.com/forums/showthread.php?t=1117725&page=2

https://g80.bimmerpost.com/forums/showthread.php?t=1882247

 

[tomfree]

That’s what I’m talking about! I was thinking it was either the Miata or possibly some GRM arrangement for good publicity but I thought is was suspicious.

FWIW, I know Andy - the guy who does a lot of the GRM tire testing. He's methodical, and most importantly brand-agnostic. He just wants whatever makes him go faster, and this gig with GRM gets him access to a ton of tires. He'll be the first one to tell you that their testing is limited by what hardware they have on hand, as GRM historically runs on a small budget. If you've got a Miata or a CRX...it's apples to apples.

 

[razorlab]

do we need to worry about the DME cutting engine power if it estimates the rear brakes getting too hot? one of my buddies that w2w's a bunch of different bmw's said that was a thing on his cars.



https://www.e90post.com/forums/showthread.php?t=1117725&page=2

https://g80.bimmerpost.com/forums/showthread.php?t=1882247

Not that I have seen.

That g80 thread has like zero useful information in it. Just some guys that sound like the g80 is their first car.

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