TRev's BRZ RTR Autocross Build

[trippinbillies40]

Sounds like we're going to be at a lot of the same events! Nice to see we'll have some heads up competition to benchmark on.

[TRev]

Originally Posted by renfield90

I noticed less highway wander after putting mine in, consistent with more toe-in.

We're talking about front toe, right? I'd actually like to play with some front toe out to improve turn-in. The rears will obviously need a little toe in.


Yeah, definitely a function of your compound. Swap them front to rear and I think you'll find you need some countersteer to make it around the course.

That 20mm bar is pretty soft IMO. Make sure you play with the stiffer setting.

It was a nice evening so I made the time to install the bolts. The front is now toe'd in a total of 1/32 (didn't measure before).

I also swapped wheels so the 4/32 tires are up front.

The car now will throttle oversteer at the limit much easier and is just a very slight bit loose for my taste. The toe change definitely has the turn in feeling a bit more lethargic.

Found out the Konis are shipping today. Will not have time to get them installed prior to the event this weekend though.

Originally Posted by trippinbillies40

Sounds like we're going to be at a lot of the same events! Nice to see we'll have some heads up competition to benchmark on.

Look forward to it!

[renfield90]

Originally Posted by TRev

It was a nice evening so I made the time to install the bolts. The front is now toe'd in a total of 1/32 (didn't measure before).

I also swapped wheels so the 4/32 tires are up front.

The car now will throttle oversteer at the limit much easier and is just a very slight bit loose for my taste. The toe change definitely has the turn in feeling a bit more lethargic.

Matches my observations from this weekend. I don't know if you get fun runs this weekend or have time to do this, but try going full stiff on the front bar to compensate. This will probably add corner exit understeer but remove inside wheelspin, increase steady state cornering ability, and improve turn-in/transitional response. Ideally you want to compare this on the same course in the same day - it may not feel faster, but if you're lacking other data acquisition then the clock doesn't lie.

This car is meant to be a transition monster and it helps to play to that strength. Ask me about the 4 cone slalom I took yesterday on the rev limiter in second without lifting...

[TRev]

Originally Posted by renfield90

Matches my observations from this weekend. I don't know if you get fun runs this weekend or have time to do this, but try going full stiff on the front bar to compensate. This will probably add corner exit understeer but remove inside wheelspin, increase steady state cornering ability, and improve turn-in/transitional response. Ideally you want to compare this on the same course in the same day - it may not feel faster, but if you're lacking other data acquisition then the clock doesn't lie.

This car is meant to be a transition monster and it helps to play to that strength. Ask me about the 4 cone slalom I took yesterday on the rev limiter in second without lifting...

Did you shorten up the end links as far as they would go too? It probably won't work out this weekend but I will have at least one test and tune before Lincoln where it should work out well to do so.

Totally agree. The first day at Nationals was the more technical/transition intense course. Car felt good and I did well. I very much enjoy slaloms which helps too. The second day the sweeper intense course was painful.

[xwd]

I felt the stiffer setting on the bar added too much understeer, but my "testing ground" was not very grippy sealed asphalt. I had the endlinks adjusted where the bar was just off the control arm in full droop. There are obviously a lot of other factors in play. This is with 0 toe in front and 1/16" total toe in the rear.

I am using the Strano bar now and it feels right in between the two settings on the WL bar. I may switch back to the WL bar just for the adjustability though, since you can always run the sides at different hole positions. We unfortunately didn't have a test and tune this year before the season, but I'm hoping to get 8 runs in on Sunday to test some things out.

[renfield90]

Originally Posted by TRev

Did you shorten up the end links as far as they would go too? It probably won't work out this weekend but I will have at least one test and tune before Lincoln where it should work out well to do so.

No, I'm on stock endlinks. I only have a very short amount of time with the car and I'm admittedly not a setup guy, but I believe full stiff is the way to go if you can adapt your driving to it.

[TRev]

Originally Posted by dwx

I felt the stiffer setting on the bar added too much understeer, but my "testing ground" was not very grippy sealed asphalt. I had the endlinks adjusted where the bar was just off the control arm in full droop. There are obviously a lot of other factors in play. This is with 0 toe in front and 1/16" total toe in the rear.

I am using the Strano bar now and it feels right in between the two settings on the WL bar. I may switch back to the WL bar just for the adjustability though, since you can always run the sides at different hole positions. We unfortunately didn't have a test and tune this year before the season, but I'm hoping to get 8 runs in on Sunday to test some things out.

Sounds like maybe the Strano bar is close to where I have my WL bar right now (soft setting with shortest end links possible). Do you like the way it feels? I would have considered it but got the WL bar and end links for next to nothing from contingency. Look forward to hearing how it goes on Sunday.

Originally Posted by renfield90

No, I'm on stock endlinks. I only have a very short amount of time with the car and I'm admittedly not a setup guy, but I believe full stiff is the way to go if you can adapt your driving to it.

Full stiff with the stock endlinks I would think is just a bit stiffer than the way I have my bar. My car feels really good on corner entry and mid corner, just a slight bit too much oversteer on corner exit.


The next race at Milwaukee is a completely different surface. Waterloo was really good concrete and Milwaukee is a sealed asphalt lot. Forecast is a few showers and about 10 degrees cooler.

[mact]

I was going to go to the Waterloo event to watch but was too lazy. A couple of my friends mentioned there was a BRZ kicking some butt up there.

[renfield90]

I should mention I'm on the Hotchkis bar as I was told it was the stiffest available. Full stiff is a bit annoying on corner exit but the times are faster than any other setting on the bar. I'll concede that the softer settings are more enjoyable to drive but my data says it's slower. I can see this being dependent on driving style so YMMV.

[TRev]

Results linked for Waterloo event and results/comments added for Milwaukee event today.

http://www.ft86club.com/forums/showp...84&postcount=1

[trippinbillies40]

Looks like we're having similar success. I'm really looking forward to running with you in Lincoln! Should be a great race! We just have to beat the damned mx5's haha.

[TRev]

Originally Posted by trippinbillies40

Looks like we're having similar success. I'm really looking forward to running with you in Lincoln! Should be a great race! We just have to beat the damned mx5's haha.

Look forward to meeting you and agreed on beating the mx5 cars!

[xwd]

Great result. Whose car was Colin driving? I saw Chris Bailey was registered in STX but his car said Miata, I am assuming it was his car?

[TRev]

Originally Posted by dwx

Great result. Whose car was Colin driving? I saw Chris Bailey was registered in STX but his car said Miata, I am assuming it was his car?

It was Alex's. I believe he is on this forum. Chris was driving the same car as Colin in the Pro class and two drivers also in it in STX. It is not fully prepped yet. Here is what was listed on the Milwaukee FB page.

Alex Manrique: This is my car. it has a decent start but still needs some key things. so far it has things like coilovers, camber plates, strut tower bar, front sway bar, rims, tires, intake, most of the exhaust, crank pulley. big things missing still are header and ecu tune. I haven't really done anything as far as weight reduction yet either besides exhaust. also I'm sure an aftermarket diff wouldn't hurt it either but the stock torsion seems to work pretty well.

Looking forward to finishing the prep on my car and an event with consistent track conditions. Hoping to make the WAI event in a couple of weeks.