The reason to have the front diff is to get into power earlier. If you are fully side loaded and spin up one end or the other inside its going to over-drive the opposite end as well as the center diff starts coming into play.

1way clutch vs torsen, I like the 1way clutch for the off throttle tight turn characteristics and adjustability. The downside is maintenance. Seems my diff degraded quick a bit over the 3 years of use so it can also become a setup variable. Im hoping adding the wheel speed logs will catch when a diff is starting to get weak.

 

ie center diff coming into play = senses the speed diff and attempts to lock?

i was thinking i'd be mostly interested in improving turn-in from a helical, without losing on throttle behavior/improving it. regardless of diff behavior, (for track) you shouldn't be getting on power before apex

 

If you want better turn-in you need to fix the roll centers

The turn-in on my car is the most absurd thing you've ever felt in an Evo and it comes a little from the front uprights but a huge impact is in the rear.

 

aside from the roll center adjuster, what else is there? physically changing the rake?

 

Adjusting rake or rear ride height doesnt change rear roll moment. And that (which even surprised me) was the biggest effect on turn-in of anything Ive done. Anyone who has a lot of time driving Evos (Marshal and the Mikko's for example) spend their first few runs turning right into cones till they adjust to the response.

 

so, what do you do to change the roll moment then?

i like that we're having a convo in 3 different threads btw, lol

 

Geometry magic!

Heh, you're the mod.. Consolidate them

 

geometry magic... sounds like stuff not legal for st*/street classes

 

What class are you trying to run? The rear diff isnt legal for STU so I assumed probably just in SP or SM. Whats that correlate to for track classes? Or if its just for fun, then it doesnt matter.

 

gridlife street. autox is just for tnt (i have a jdm rear bumper too, so i'm like xp or whatever). rules here:

 

Just says pickup points must remain OEM, doesnt say you have to keep anything that attaches to them.

 

what's your suggestion?

 

Knuckles are legal for Street in GL. They are not legal in Global Time attack until you get to Limited. My recommendation is don't mod your car going off the rules for a season that just ended, wait until December/January when they release 2020 rules. I've heard murmurs of big changes for next year.

 

thanks, that's sound advice. my wishlist for gridlife street i that they get rid of e85 for street and street mod (may fix some problems there) and 265s for street awd! yay

 

Honestly I'd be surprised if either of those changed. They wouldn't let street run larger tires than street mod and awd would gain an even larger advantage than they already have in street mod if they were allowed a larger tire. And they won't bump tire size for 2wd cars because then they can run ACR tires and the time gaps between track mod and street mod will be even tighter.

As for ethanol, it doesn't make a huge difference in street but enough people wanted it so they made it legal. In street mod you pretty much have to run E85 or race gas if you want to compete. FWIW you should want to have E85. On the tighter tracks having better mid range torque allowed with E85 is a good edge you'll have over all the NA V6 guys.

I just want them to rename street so people don't confuse street and street mod so much.