Track forum general chit chat.

[Richneerd]

Originally Posted by turbo_joe

I have a nine lives wing and I am really happy with it on track compared to my old GT4 wing. I do think it could be a bit more stable and I might try to reinforce it some later down the road.

Currently running about 7 degrees AOA with a 1/2" gurney flap.


For front aero I just redid my front splitter (home made with nine lives end plates) combined with APR fender spats, BW dive planes, track spec hood vents, and race louver fender vents. The APR spats leave a small gap but I am fine with it since I have the end plates as well and dont want to create a pocket in that area of the splitter.

I will be testing the new setup next weekend at VIR.

OMG I have the exact same setup coming. I guess I can be your twin as a sedan.

[b4hand]

Originally Posted by turbo_joe

I used rivnuts to mount my fender spats and dive planes. It’s nice to be able to remove them any time I want

Link? Yours are shiny

[turbo_joe]

Originally Posted by b4hand

Link? Yours are shiny

I just used my own bolts. Stuff you can just get on Amazon

[b4hand]

Originally Posted by turbo_joe

I just used my own bolts. Stuff you can just get on Amazon

looks like you have fender washers of some sort?

[StripclubDJ]

Originally Posted by b4hand

looks like you have fender washers of some sort?

Looks like jdm counter sunk under hood dress up bolts and washers

[turbo_joe]

Originally Posted by StripclubDJ

Looks like jdm counter sunk under hood dress up bolts and washers

Correct

[omgzirra_exe]

anyone in the bay area, able to do a PPI for me? its for a MBR E92 M3

either in mountain view or just a couple miles from it.

[iamtrashman]

Originally Posted by roastbeef

yea, you'd be putting that entire strain on the diff bolts. the subframe moves about 1/2" with decent acceleration. i'd say you want it to all flex, or none at all rather than have it transferred all to the diff mounts.

Sorry to go back so far in this thread, but I just wanted some clarification here.

I intend to do solid subframe bushings eventually when I pick up a spare subframe, and I was planning on sticking with the stock diff bushings. Just curious on why this isn't a good idea when F8X cars have a solid subframe with what I would assume is rubber diff bushings?

I have no qualms about going delrin for the diff bushes but it would be nice to not ruin the road manners of my mainly street driven car if I can help it. I know the solid subframe bushes add next to no NVH

[///Mobbin]

If I recall correctly the stock diff bushings are foam and don't last well over time. I'm personally on solid subframe and powerflex purple diff bushings (DCT) and really don't notice any extra NVH from it. For a car that sees the track I'd recommend it. If pure street I would probably do less of all of the above in general.

[rhyary]

FYI.
AIM Virtual Seminar specific to E92M3 using PT6 ECU

https://www.bimmerpost.com/forums/sh...php?p=28693762

[roastbeef]

Originally Posted by iamtrashman

Sorry to go back so far in this thread, but I just wanted some clarification here.

I intend to do solid subframe bushings eventually when I pick up a spare subframe, and I was planning on sticking with the stock diff bushings. Just curious on why this isn't a good idea when F8X cars have a solid subframe with what I would assume is rubber diff bushings?

I have no qualms about going delrin for the diff bushes but it would be nice to not ruin the road manners of my mainly street driven car if I can help it. I know the solid subframe bushes add next to no NVH

All the energy has to go somewhere. It goes from the driveshaft to the pumpkin, which distributes it to the subframe, the axles, and the tires give it to the road.

If the subframe isn't absorbing it via the bushings, the strain is put through the diff bushings before it gets distributed through the axles and the road.

[iamtrashman]

Originally Posted by ///Mobbin

If I recall correctly the stock diff bushings are foam and don't last well over time. I'm personally on solid subframe and powerflex purple diff bushings (DCT) and really don't notice any extra NVH from it. For a car that sees the track I'd recommend it. If pure street I would probably do less of all of the above in general.

Thanks for the insight. My tolerance for annoying garbage is pretty high as a result of the drift cars that I drove on the street when I was younger but I have had enough projects that I now know a little noise here and a little vibration there adds up to a pretty annoying vehicle to try and live with.

Luckily these cars are fairly quiet inside when they are stock and I think with a full interior doing solid subframe/poly diff bushings wouldn't send me over the edge, but I also know once you cross the line you find yourself driving it less and not getting out to enjoy it as much.

Mind you in this thread/section of the forum it seems most people don't use these things much outside of track time and these considerations aren't as much of a factor, but maybe that just has to do with the topics at hand.

Edit: roastbeef I think the energy is supposed to go through the diff input shaft and turn the axles, the point of these firmer bushings is to get more of it to go through there and not waste any going through the bushings. I just didn't see the "harm" I guess, in leaving the diff bushings stock. If they fail in an unreasonable amount of time with solid subframe bushings and it's been documented or maybe its common knowledge and I just hadn't heard about it, was sort of what I was interested in.

[roastbeef]

Right, but the most "give" in your drivetrain will now be concentrated on your diff, rather than be shared by your diff and subframe bushings.

[omgzirra_exe]

Originally Posted by omgzirra_exe

anyone in the bay area, able to do a PPI for me? its for a MBR E92 M3

either in mountain view or just a couple miles from it.

probably sending the car to Performance Dynamics. forgot they were in MV.

[admranger]

Originally Posted by turbo_joe

I just used my own bolts. Stuff you can just get on Amazon

WUT?!!!!? Not drilled titanium bolts? Shame! Shame! Shame!

[k_mann]

Anyone running the pfc z54 kit know if there's still support new hats and rings?

[stevejin]

Just wanted to introduce myself here since I'll be lurking on (hopefully contributing to) this thread a lot more frequently. I'll probably make a separate thread/journal in the near future, but for now I'm hoping this is the right place to ask a question regarding tires.

Some background information:

I finally transitioned from my dedicated track car of 6-7 years (S2000) on to the E90. I lost my S2000 during the middle of last year here in the Northeast from Hurricane Ida, and decided to give my E90 a try for the next couple of years until I find a replacement track car. My main goal with the car is to be able to "arrive and drive," but I don't mind swapping on to a second set of wheels/tires at the track.

So far, I've taken the E90 to 7 events last season (NJMP, Watkins Glen, Lime Rock, and Pocono). I started out with 275/35/18 RS4s, then got a set of RE71Rs in same sizing through TireRack's closeout sale to see how the car would perform with grippier tires. So far, the car's been pretty fun to drive on track.

The car had mild modifications last season:
- Dinan front sway bars (came with the car), Swift lowering springs on stock EDC shocks, Vorshlag camber plates
- Stock calipers with track pads (Hawk DTC)
- 18x10 +25 wheels

For this season, I changed the following:
- Vorshlag to Ground Control -- I was only able to squeeze out -3.2º with the Vorshlag plates, and I'd like to squeeze out a bit more and Ground Control plates seem to be able to do that
- OEM front calipers to AP Racing 9660 with Ferodo 3.12 pads
- 18x10 +25 wheels to 18x10.5 +22 wheels

I'll be using RS4s for most of the events, but at the same time I'd like to see how much I can squeeze out of my current setup with tires that have decent pace in the advanced/instructor run groups from time to time. If any of the E9X track junkies here has been running any "cheater" 200TW and 100TW tires like the A052s, CR-1/CR-S, AR-1s, or any similar tires on the E9X, would you be able to share your thoughts? What would you say about their general longevity (how many sessions/days)? I have experience running AR-1s, RC-1s, and NT01s on the S2000 and other lighter cars, but don't have any experience running them on this chassis.

Also, if anyone could PM me the link to the Discord server, I'd greatly appreciate it. I'd love to join in on the fun.

Apologies for the long introductory post.

[Bartledoo]

Originally Posted by k_mann

Anyone running the pfc z54 kit know if there's still support new hats and rings?

Yes to rings. I purchased fronts from Hinz Motorsports last year. They had the best price at that time.

[Richneerd]

Originally Posted by stevejin

Just wanted to introduce myself here since I'll be lurking on (hopefully contributing to) this thread a lot more frequently. I'll probably make a separate thread/journal in the near future, but for now I'm hoping this is the right place to ask a question regarding tires.

Some background information:

I finally transitioned from my dedicated track car of 6-7 years (S2000) on to the E90. I lost my S2000 during the middle of last year here in the Northeast from Hurricane Ida, and decided to give my E90 a try for the next couple of years until I find a replacement track car. My main goal with the car is to be able to "arrive and drive," but I don't mind swapping on to a second set of wheels/tires at the track.

So far, I've taken the E90 to 7 events last season (NJMP, Watkins Glen, Lime Rock, and Pocono). I started out with 275/35/18 RS4s, then got a set of RE71Rs in same sizing through TireRack's closeout sale to see how the car would perform with grippier tires. So far, the car's been pretty fun to drive on track.

The car had mild modifications last season:
- Dinan front sway bars (came with the car), Swift lowering springs on stock EDC shocks, Vorshlag camber plates
- Stock calipers with track pads (Hawk DTC)
- 18x10 +25 wheels

For this season, I changed the following:
- Vorshlag to Ground Control -- I was only able to squeeze out -3.2º with the Vorshlag plates, and I'd like to squeeze out a bit more and Ground Control plates seem to be able to do that
- OEM front calipers to AP Racing 9660 with Ferodo 3.12 pads
- 18x10 +25 wheels to 18x10.5 +22 wheels

I'll be using RS4s for most of the events, but at the same time I'd like to see how much I can squeeze out of my current setup with tires that have decent pace in the advanced/instructor run groups from time to time. If any of the E9X track junkies here has been running any "cheater" 200TW and 100TW tires like the A052s, CR-1/CR-S, AR-1s, or any similar tires on the E9X, would you be able to share your thoughts? What would you say about their general longevity (how many sessions/days)? I have experience running AR-1s, RC-1s, and NT01s on the S2000 and other lighter cars, but don't have any experience running them on this chassis.

Also, if anyone could PM me the link to the Discord server, I'd greatly appreciate it. I'd love to join in on the fun.

Apologies for the long introductory post.

I don't use cheater tires but a buddy of mine runs them. After 4 events they're pretty much gone.

I'm running Michelin Super Sport. I'm on my 9th so far. I got 2 left till my fronts are done.

Welcome, and enjoy! tracking gets addictive!

[Davisca455]

Originally Posted by stevejin

Just wanted to introduce myself here since I'll be lurking on (hopefully contributing to) this thread a lot more frequently. I'll probably make a separate thread/journal in the near future, but for now I'm hoping this is the right place to ask a question regarding tires.

Some background information:

I finally transitioned from my dedicated track car of 6-7 years (S2000) on to the E90. I lost my S2000 during the middle of last year here in the Northeast from Hurricane Ida, and decided to give my E90 a try for the next couple of years until I find a replacement track car. My main goal with the car is to be able to "arrive and drive," but I don't mind swapping on to a second set of wheels/tires at the track.

So far, I've taken the E90 to 7 events last season (NJMP, Watkins Glen, Lime Rock, and Pocono). I started out with 275/35/18 RS4s, then got a set of RE71Rs in same sizing through TireRack's closeout sale to see how the car would perform with grippier tires. So far, the car's been pretty fun to drive on track.

The car had mild modifications last season:
- Dinan front sway bars (came with the car), Swift lowering springs on stock EDC shocks, Vorshlag camber plates
- Stock calipers with track pads (Hawk DTC)
- 18x10 +25 wheels

For this season, I changed the following:
- Vorshlag to Ground Control -- I was only able to squeeze out -3.2º with the Vorshlag plates, and I'd like to squeeze out a bit more and Ground Control plates seem to be able to do that
- OEM front calipers to AP Racing 9660 with Ferodo 3.12 pads
- 18x10 +25 wheels to 18x10.5 +22 wheels

I'll be using RS4s for most of the events, but at the same time I'd like to see how much I can squeeze out of my current setup with tires that have decent pace in the advanced/instructor run groups from time to time. If any of the E9X track junkies here has been running any "cheater" 200TW and 100TW tires like the A052s, CR-1/CR-S, AR-1s, or any similar tires on the E9X, would you be able to share your thoughts? What would you say about their general longevity (how many sessions/days)? I have experience running AR-1s, RC-1s, and NT01s on the S2000 and other lighter cars, but don't have any experience running them on this chassis.

Also, if anyone could PM me the link to the Discord server, I'd greatly appreciate it. I'd love to join in on the fun.

Apologies for the long introductory post.

My experience level is low (12 events), and my pace isn't earth shattering (1:47 at Laguna Seca), so take that into consideration.

But I do have two recent track days of experience on NT01s on my E92.

I was eyeballing NTO1s because of size choices, availability, cost, so when I asked more experienced people I know (a couple even on the E9x platform), they all pretty much said the same thing about NT01s…"Not the absolute fastest tire in the world, but they communicate well, perform well all the way to the cords, and last for 12 or more HPDE days."

Compared to my PS4s, I absolutely love them on track.
Especially the way they last me the entire session without getting greasy.


Had my first slide with them in T10 at Laguna two weeks ago, total nothing burger.
Even though they didn't howl, I thought they communicated very well, very predictable in my opinion.

I'm stock ride height, EDC and stock springs, ST60 front/DCT-60 pads, OEM rears/DTC-60 pads, Hotchkis bars F/R (full soft), Vorshlags, 275/35/18 front, 305/35/18 rear.

The track alignment is:
Camber -3.0 degrees/slight toe OUT, front.
Camber -1.6 degrees/slight to IN, rear.

Tire wear after two events looks very even.

[k_mann]

Originally Posted by Bartledoo

Yes to rings. I purchased fronts from Hinz Motorsports last year. They had the best price at that time.

Cool I'll reach out to them about the hats! Do you know if arc-8's clear the caliper? Not sure if that design works with them

[omgzirra_exe]

Originally Posted by stevejin

Just wanted to introduce myself here since I'll be lurking on (hopefully contributing to) this thread a lot more frequently. I'll probably make a separate thread/journal in the near future, but for now I'm hoping this is the right place to ask a question regarding tires.

Some background information:

I finally transitioned from my dedicated track car of 6-7 years (S2000) on to the E90. I lost my S2000 during the middle of last year here in the Northeast from Hurricane Ida, and decided to give my E90 a try for the next couple of years until I find a replacement track car. My main goal with the car is to be able to "arrive and drive," but I don't mind swapping on to a second set of wheels/tires at the track.

So far, I've taken the E90 to 7 events last season (NJMP, Watkins Glen, Lime Rock, and Pocono). I started out with 275/35/18 RS4s, then got a set of RE71Rs in same sizing through TireRack's closeout sale to see how the car would perform with grippier tires. So far, the car's been pretty fun to drive on track.

The car had mild modifications last season:
- Dinan front sway bars (came with the car), Swift lowering springs on stock EDC shocks, Vorshlag camber plates
- Stock calipers with track pads (Hawk DTC)
- 18x10 +25 wheels

For this season, I changed the following:
- Vorshlag to Ground Control -- I was only able to squeeze out -3.2º with the Vorshlag plates, and I'd like to squeeze out a bit more and Ground Control plates seem to be able to do that
- OEM front calipers to AP Racing 9660 with Ferodo 3.12 pads
- 18x10 +25 wheels to 18x10.5 +22 wheels

I'll be using RS4s for most of the events, but at the same time I'd like to see how much I can squeeze out of my current setup with tires that have decent pace in the advanced/instructor run groups from time to time. If any of the E9X track junkies here has been running any "cheater" 200TW and 100TW tires like the A052s, CR-1/CR-S, AR-1s, or any similar tires on the E9X, would you be able to share your thoughts? What would you say about their general longevity (how many sessions/days)? I have experience running AR-1s, RC-1s, and NT01s on the S2000 and other lighter cars, but don't have any experience running them on this chassis.

Also, if anyone could PM me the link to the Discord server, I'd greatly appreciate it. I'd love to join in on the fun.

Apologies for the long introductory post.

glad to have you here! as a former S2k track car owner my self.

as far as cheater tire goes. 3 events and daily driving. was my longest use.