aidandj

iTrader: (5)

Want to see this. I love thunderhill.

d k

iTrader: (4)

Was there any mention of the Mixed Flow Technology like on the 7163?

Chilicharger665

iTrader: (2)

charliehayes22

I don't think that's the intention from Greg. You can ask if you please, updating/back dating subframes and suspension pieces are legal. Bumpsteer is also legal.

Relocation in their minds for the rules is getting a torch out and welder. It does not say I cannot follow the update/backdate rule in ST4, I also don't consider bumpsteer relocation if your following this mind set.

Savington

iTrader: (31)

I was able to read it both ways. It says you can swap subframes, but it also says that ST4 guys can't move pickup points. The NB subframe technically moves the points on an NA. I asked Greg, we'll see what he says.

charliehayes22

I did too. I got the answer that I expected and wanted when I read the rules.

As long as it's factory bolt on its good for ST4.

He also states an answer supporting this on the NASA Forums.

d k

iTrader: (4)

There was also a clause somewhere that you can backdate/update oem components without a penalty.

jpreston

iTrader: (4)

Dry Sump Kits - Pace Products

Maybe? @Kmiata

emilio700

iTrader: (3)

Looks like it might just clear the rack.

KMiata

I looked at the Pace kit in initially, but I don't think it will clear. Clearance over the rack would be close, but I also don't think there is any room for the big external pump.

So did Greg respond to anyone about if we can use a tubular subframe with all OEM pickup points? I know at least a few customers have asked, so not sure if that has swayed the decision.

edit: nevermind, I checked my emails and I had confirmed that it was a no-go earlier this fall.

engineered2win

I haven't emailed Greg, but my understand is it's not allowed. This would fall under the +0.4 non-production adjustment in TT1-TT3. non-production is not allowed for TT4, and even if it was, isn't worth the penalty unless you really go all out with a tube frame. I know of one LSx Miata that runs TT and has to take non-production for not having the factory unmodified subframes.

Arca_ex

iTrader: (2)

And back from the dead...

Toyo's look hot with the new 2022 rules but it seems like it's going to be right at the limit or just beyond the reach of the K24Z3 crowd...

I don't know if I can get my comp weight much lower than 2250, and at that weight with 245 Toyo RR, aero, and even no cable throttle credit I'd still have a max of 225whp AVG. With most guys making 205 to 210whp on pump gas, I'm hoping e85 is worth another 10whp, and the underdrive ATi super damper, exhaust collector porting, and velocity stack intake, together hopefully another 5whp? So best case scenario I'll be able to do 225whp all in and no ballast? Not really ideal, I'd prefer to be running heavier. Only thing I can think of left to do is higher compression pistons, punch the block out and send the head out for CNC porting. Other than that what else is left?

Switching to Hoosier R7 is a whopping 31whp difference at that weight...

12.0 base P/W
2250lbs -0.2 penalty
Toyo RR +1.6 credit
245mm Tire Width +0.6 credit

After mod factor it's 10.0 P/W now.

flier129

iTrader: (7)

Still worth it!

If I ever run ST4/TT4 I'll just be slightly underpowered, but still plan to run R7s. Maybe as time goes on the k24z3 will get some more support to make a tad more power easily?

thebeerbaron

iTrader: (1)

I finally reviewed the new rules.

I'm a bit surprised that the R7 will be required at the Championships.
NorCal doesn't usually run at Laguna Seca and has no events there this year. I'm not sure if SoCal will. Someone I spoke with at the 25 made the note that NASA was essentially encouraging racers to join another race group in order to get track time there before the Championships.

With the R7 required for the Championships and making such a big impact on power limits, no wonder they've gone crazy with the rules around ECU maps and switching.

codrus

There was a thread on a NASA forum about the new rules in which they said that the current ST4/TT4 competitors are mostly pretty happy with Hoosier and want to stick with it. They were suggesting that in 2023 it may become a Hoosier spec tire class, and that this was the reason for the special rule at the championship event.

--Ian

thebeerbaron

iTrader: (1)

Very interesting. Shows how little I know about actual ST4 competition, as opposed to just what I imagine in my nutty little world.

So basically the strategy would be - run +18 HP on something like an RS4 until I'm within shouting distance of contingency Hoosiers, then give up those horses and swap to Hoosiers?

Purple crack indeed...

thebeerbaron

iTrader: (1)

Correction - for 2022 I could run the non-Hoosiers, but in 2023 I'll need to be robbing banks to pay for tires...

I really wish the MK60 was allowed in ST5. I really don't want to give it up, but maybe that's where I'll be in '23.

Arca_ex

iTrader: (2)

Whoever said they like the Hoosiers for ST4 has to be winning them. Toyo now has better contingency, better prices and better longevity. Everyone at a regional level is going to be running that. Would be dumb to turn it into a spec Hoosier class.

codrus

Here's the thread: https://community.drivenasa.com/topi...oday/#comments

--Ian

doward

Y’all are way out of the loop. Fast and front running ST4 cars are $80-125k builds. It’s essentially a spec E46M3 class. It’s fast and expensive and Hoosiers are absolutely the norm. Hoosiers are the norm in ST5 too btw, and they will still be at the front in 2022.

spoken as a former ST1-4 series director and contestant in 5 different regions over the last 5 years.