ST4/TT4 Thread
#24
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Join Date: Feb 2016
Location: Walnut Creek, Ca
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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.
#25
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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.
#26
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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.
#30
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.
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.
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#31
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.
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.
#32
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.
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.
#34
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.
I'm a bit surprised that the R7 will be required at the Championships.
Originally Posted by NASA
6.4.1.3 Specification ST4 only (excludes TT4)--The Hoosier R7 and A7 will be the Specified and only permitted tires at the 2022 NASA 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.
#35
--Ian
#36
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
--Ian
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...
#40
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.
spoken as a former ST1-4 series director and contestant in 5 different regions over the last 5 years.