E9x M3 LAP TIMES (Road Course)

[USCTrojanMan29]

Originally Posted by DD GT3 RD

^thanks

Hahaha I hit too many but I thought u want to go over the last right one to be further over so when going around the last left exiting the straight that it would be good to further right so it's less of a turn? it upsets the car too much?

I've been told by both BMW CCA and PCA instructors that you don't want to get any of the curbs in the esses except for the first one on the left coming out of the sweeper because it does unsettle the car since they are not flat.

[TheKosherStogie]

Originally Posted by USCTrojanMan29

I've been told by both BMW CCA and PCA instructors that you don't want to get any of the curbs in the esses except for the first one on the left coming out of the sweeper because it does unsettle the car since they are not flat.

Makes sense and now youre the 2nd or 3rd person who has told me so. I just felt like they didn't upset the car much and ones it lands it's settled but next time I won't!

[bigjae1976]

Originally Posted by Billj747

T1 had a big oversteer moment while T2 is a tight hairpin. Both of which required a lot of steering input like the low speed tight autocross that the officer was on in his video. Since my car was very loose, it needed very little steering input and a lot of 4wheel sliding and neutral steer -which meant I was not steering much. If the car was more balanced, I would have been shuffling more.

Shuffle steering keeps your torso more upright for big steering inputs. I mostly use it for tighter corners or moments of oversteer. I've seen people spin and even wreck from having their hands glued to 9&3 and running out of steering correction input. IMO shuffle steering is a good tool to have and use when needed.

0.02

Agreed, I don't think people need to glue their hands to 9 and 3 o' clock. I feel like good drivers develop tools that they can use. And really good drivers know what tool to use and when.

I can and have shuffle steered on certain odd occasions. But for big moments of oversteer, I also let the rotation of the car do the steering. Its a tool that I can use.

[dogbone]

E90 M3
Track/course: Chuckwalla CW
Best Lap Time: 1:59.56
Brakes: AP Racing - Cobalt Friction XR2 front/XR3 rear
Tires: Hankook TD - 295/30/18 square on Apex Arc-8 10.5" (tires on 4th day)
Suspension: JRZ RS Pro
Other mods: VF620, Track pipes with stock exhaust, (no aero parts, full interior)

Went to Chuckwalla for a little year end fun. There was a great group of homies out there! The first day had ideal weather, but there was a ton of cars out there, and the speed differential between cars was pretty much the worst I've ever seen.

The second day started with a lovely desert wind/sand storm. The last time I checked, this is not the best for grip or your paint job, right?----or visibility or your air filter or.... I ran two laps and got off the track. I was amazed at how many people ran the full sessions in the wind/sand. They actually closed the track for awhile because the corner workers couldn't see the whole track.......But.....it cleared up, and was virtually ideal conditions after 1PM. MANY people left during the wind and closure, so later in the day, it was great weather and clear track!

Anyway, I was happy with the result, especially since the tires were on their 4th day.

Ideal track conditions? That's a braking zone indicator to the right of the car. Yup, there's a turn coming somewhere up ahead......I wonder where it is.....

[TheKosherStogie]

1:30:9 (Q Star and Harry Racing App) but.... 1:31:04 on Transponder Grrrr
Added the APR GT250 wing (dropped 2 seconds) but the car handles terrible. Understeers thru all the turns and is boring as hell, I dislike it. So you need a serious splitter if you are gonna do the wing to balance the aero, which I am trying to figure out.

Hankook Rs-3 Tires
KW Clubsport 3 way
Stop Tech Trophy
stock power, stock exhaust with dinan muffler


Here's a clip of turn 8 which I can now just go full throttle thru from 7 its full throttle till 9

[skxf430]

DD,

Time for a supercharger on your car.

[USCTrojanMan29]

DD, you should go to NT01s. The car may be understeering because the RS3s might be heat cycled out.

[Casey@RWE]

Originally Posted by USCTrojanMan29

DD, you should go to NT01s. The car may be understeering because the RS3s might be heat cycled out.

too much rear aero balance will lift the front up and cause understeer. Alot of people have this problem when they only add a wing.

[Casey@RWE]

DD GT3 RD,

We have a custom splitter design with APR that balances the GT-250 perfectly on the e9x chassis. It also mounts to several stock locations on the front of the car. Only thing required for proper fit is a flat bottom lip and some drilling by the installer. Comes in two materials, the one pictured and a slightly thicker honeycomb carbon, in case you want to stand on it . Get some front end bite and your car will be in the 29's in no time.

[skxf430]

DD,

Did you also change your spring rates? Just a thought that once, you have added the splitter and rear wing, your spring rates could be too soft for that setup.

[OC3]

Originally Posted by DD GT3 RD

Understeers thru all the turns and is boring as hell, I dislike it. So you need a serious splitter if you are gonna do the wing to balance the aero, which I am trying to figure out.

Originally Posted by skxf430

DD,

Time for a supercharger on your car.

Originally Posted by USCTrojanMan29

DD, you should go to NT01s. The car may be understeering because the RS3s might be heat cycled out.

Originally Posted by skxf430

DD,

Did you also change your spring rates? Just a thought that once, you have added the splitter and rear wing, your spring rates could be too soft for that setup.

Where does it end? or, does it?

[TheKosherStogie]

Originally Posted by USCTrojanMan29

DD, you should go to NT01s. The car may be understeering because the RS3s might be heat cycled out.

No, its not the tires...its unbalanced aero. Even if i had a TD or NT01 it would happen just at a higher speed.

Originally Posted by RWE

DD GT3 RD,

We have a custom splitter design with APR that balances the GT-250 perfectly on the e9x chassis. It also mounts to several stock locations on the front of the car. Only thing required for proper fit is a flat bottom lip and some drilling by the installer. Comes in two materials, the one pictured and a slightly thicker honeycomb carbon, in case you want to stand on it . Get some front end bite and your car will be in the 29's in no time.

haha, Oh I know...pretty sure you posted one of my best friend's car

Originally Posted by skxf430

DD,

Did you also change your spring rates? Just a thought that once, you have added the splitter and rear wing, your spring rates could be too soft for that setup.

Spring rates are what KW CS comes with but I know for a fact I need front aero, its just unbalanced. The spring rates are good, around 550-600 front and 800 rear

[skxf430]

Originally Posted by OC3

Where does it end? or, does it?

Randall,

It never ends.

DD,

When I was looking at aero for my Z06, the guys from Performanc Shock, where I had purchased my Ohlins coilovers suggested I get new spring rates if I were to add full aero due to the additional downforce. The increase in spring rates will vary from driver to driver, and even track to track, but they said my current spring rate for a non-aero car will not be very well balanced with a splitter and wing. Anyway, just passing on some info I was told.

[TheKosherStogie]

Originally Posted by skxf430

Randall,

It never ends.

DD,

When I was looking at aero for my Z06, the guys from Performanc Shock, where I had purchased my Ohlins coilovers suggested I get new spring rates if I were to add full aero due to the additional downforce. The increase in spring rates will vary from driver to driver, and even track to track, but they said my current spring rate for a non-aero car will not be very well balanced with a splitter and wing. Anyway, just passing on some info I was told.

thank you, I appreciate it truly. My buddy def needs new springs, but I know a couple guys running similar rates with aero but maybe ill talk to a few people..I def need front aero first then ill go from there

[OC3]

Originally Posted by DD GT3 RD

Added the APR GT250 wing (dropped 2 seconds) but the car handles terrible. Understeers thru all the turns and is boring as hell, I dislike it. So you need a serious splitter if you are gonna do the wing to balance the aero, which I am trying to figure out.

As you know, Big Willow is a high-speed track where aero plays a big part.

I wonder, then, what your impression is going to be at lower-speed, technical track like Buttonwillow and Chuckwalla.

[Casey@RWE]

Originally Posted by OC3

As you know, Big Willow is a high-speed track where aero plays a big part.

I wonder, then, what your impression is going to be at lower-speed, technical track like Buttonwillow and Chuckwalla.

KC from APR and myself have had this discussion many times. Buttonwillow is very much an aero track. The difference should range at roughly 3 seconds with a good wing and splitter.

[Casey@RWE]

DD,

What spring rates are you running? stock Clubsports?

[TheKosherStogie]

Originally Posted by OC3

As you know, Big Willow is a high-speed track where aero plays a big part.

I wonder, then, what your impression is going to be at lower-speed, technical track like Buttonwillow and Chuckwalla.

I didn't believe the wing would do much under 80 but it still does. I would go full throttle thru 2 and just under steer even at FULL LOCK. Even on 5 I tossed the wheel and floored it and couldn't over steer. Was retarded

[TheKosherStogie]

Originally Posted by RWE

DD,

What spring rates are you running? stock Clubsports?

Yes 3 way clubsports. Think 550/800.
That's what the car u posted above runs if it's Cody's.

[Casey@RWE]

Originally Posted by DD GT3 RD

Yes 3 way clubsports. Think 550/800.
That's what the car u posted above runs if it's Cody's.

Yeah you'd be fine with that front splitter, it'll drop you at least a second.

[1MOREMOD]

Originally Posted by RWE

too much rear aero balance will lift the front up and cause understeer. Alot of people have this problem when they only add a wing.

Doesn't rear aero cause more grip at the rear not lift the front. Grip at front would be relatively less due to more rear?

[TheKosherStogie]

Originally Posted by 1MOREMOD

Doesn't rear aero cause more grip at the rear not lift the front. Grip at front would be relatively less due to more rear?

thats what he said...rear aero lifts the front so it understeers cause there is less front grip than rear (pushes the back down causing front end lift)