Street Mod.

[*Ulimited*]

Originally Posted by smoky

The front bushing really went bad fast (small one), lots of play in it, wheel was moving quite a lot on both side. That one is not sealed.

The rear one did a bit better, it's also a lot bigger, it's just starting to be lose and not smooth. It's sealed and has grease in it already.

It's hard to tell in the product pictures but can you just press your own bearing into the housing? The EMS one are just held in with a circlip.

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[smoky]

I have an opportunity to get a used RCE Tarmac 2 for my GD for cheap and would like to know feedback if someone tried it on a SM car. If you have tried one, what was the spring rate with it?

Currently have a set of fortune auto 510, 13kg/mm + 3k helper spring (with lot of preload) in front and 10kg/mm + 4k helper spring (almost no preload) in the rear.

[Thorium06]

Originally Posted by smoky

I have an opportunity to get a used RCE Tarmac 2 for my GD for cheap and would like to know feedback if someone tried it on a SM car. If you have tried one, what was the spring rate with it?

Currently have a set of fortune auto 510, 13k + 3k helper spring (with lot of preload) in front and 10k + 4k helper spring (almost no preload) in the rear.

The RCE is both a step up and down in different ways. The RCE/KWs have nearly unparalleled travel and are amazing at keeping the inside rear tire planted compared to the Fortunes that you’re currently running. Overall just based on this, you’d find time on course.

However, the RCE is limited by the rear valving and the inability to control a spring rate that is needed in even STU let alone SM. The rear shocks begin losing control around the 550lb mark, 650 is really pushing it. I ran around 800-900 out back in STU and threw in some 1000lb springs the night before Nationals this year in SM.

Either way, the KW/RCE shock package is excellent, especially if you stay within the rates they were designed to handle, and is still a large step up over the Fortune setup and other shocks that use a generic shock and adjustable lower mount to fit the same shock on multiple platforms.

[T-37]

Is that with or without a rear bar for reference? I'm lifting inside rears on 255 re71s with T2s with their standard rates, but I'm using 25f 22r adjustable bars. But I'm using a Kaaz rear lsd and haven't noticed any ill effects from it yet.

Switching to RCEs over the generic asian coilovers I had before (stance supersport) has been a big improvement for me, but I was only running 8k/6k on street tires.

You may have to raise the car a dab because of the fixed mounting bracket with the RCE depending how low you have it now

I got mine 2nd hand for cheap too, and couldn't be happier with them

[Thorium06]

I was only referring to the shocks as being the only variable. Obviously there are other parts that contribute such as the bar, endlink, bushings, total roll, aero ect. But the travel, as you mentioned too, of the KW is far superior to that of the generic asian offerings.

[tsrapophis]

I've recently got my fresh G25-660 build to the track and the dyno and I'm very pleased with the results. 400 whp/350 ftlbs on pump gas with >300 ft/lbs of torque from 4200-7000 rpm. Throttle response is fantastic, from datalogs I can see that I go from full engine vacuum (30kpa absolute) to full boost (20psi gauge or 240kpa absolute) in about 0.8 seconds. If anyone is thinking about it I do recommend it.

build details.
https://forums.nasioc.com/forums/sho....php?t=2910464

[tsrapophis]

I'm thinking about tires for next season and looking at the Yokes A052. The reviews I can scrounge say that it performs but will die extremely quickly with camber challenged vehicles. Has anyone heard anything or used this tire on a Subaru with 2.5-3.5 degrees negative camber?

[subydude]

You'd get more results in the STU thread most likely. The majority of SM people run Hoosiers.

That being said, what I've seen on other cars is low initial camber plus a bad camber curve does end them in 50-60 runs tops. I saw a DS Focus RS cord in 38 runs at Nationals and they'd already been flipped once. Higher initial camber should help, but without roll correction to keep the camber happy I'd guess (and it's just a guess) but you'd likely get 70-80 runs if you flipped and monitored. On something not heavy with good camber AND a good camber curve like a Miata I'd bet 120-140.

[tsrapophis]

Originally Posted by subydude

You'd get more results in the STU thread most likely. The majority of SM people run Hoosiers.

That being said, what I've seen on other cars is low initial camber plus a bad camber curve does end them in 50-60 runs tops. I saw a DS Focus RS cord in 38 runs at Nationals and they'd already been flipped once. Higher initial camber should help, but without roll correction to keep the camber happy I'd guess (and it's just a guess) but you'd likely get 70-80 runs if you flipped and monitored. On something not heavy with good camber AND a good camber curve like a Miata I'd bet 120-140.

Thanks for weighing in, I'll check over on the STU thread. Our local club does an SM street tire class which is why I was considering.