STU Target Weight/WHP Ratio

[anthony1k]

I seem to remember reading that the '09 WC Realtime Acuras were putting out around 285 WHP. At 2750 lbs this puts them at around 9.6 lbs/WHP. Is this a good target number for STU? Any guesses of where about the top 3 at the runoffs were?

[Matt93SE]

Sounds like a good target to me. if you can keep up with the winners, you're doing good..

[anthony1k]

Sounds like a good target to me. if you can keep up with the winners, you're doing good..

I'm actually trying to get a sense whether or not this is a good number. WC teams typically do not broadcast HP numbers.

[Chip42]

my napkin math has it at 9-10#/hp. supposedly they are using "power numbers" in STO - something like HP*Tq/2. maybe the same in STU, so classifications might see more hp/# in the lower displacements and less in the higher. as it is, they need time for the class to developed and then for data to be collected. it's kind of a big "?"

build one. I am.

[Greg Amy]

Since STU is an engine-centric class, there's not a direct horsepower-to-weight target, it's a displacement-to-weight target. The target range in STU - just a target, mind you, not an end-all, be-all guaranteed goal - is 120hp/liter.

Since the STCS-published minimum weight is 1.1 pounds per cc displacement, one can thus infer:

120hp/liter x 1 liter/1000cc x cc/1.1# = .109 hp/#, or 9.17 #/hp

PLEASE NOTE: "Target range". Not a guaranteed end result.

Also don't forget that the RealTime-prepped WC car now has to add 5% to its weight.

GA

[23racer]

With the new rules, my car will be running very close to 9.9 lbs per whp. If that is the target the additional 5% really is working and I don't need to loose as much weight this winter, .

The buzz seems to have died down, so the new rules must be close to acceptable for everyone. Great job!

Eric

[Knestis]

Since STU is an engine-centric class, there's not a direct horsepower-to-weight target, it's a displacement-to-weight target. The target range in STU - just a target, mind you, not an end-all, be-all guaranteed goal - is 120hp/liter.

Since the STCS-published minimum weight is 1.1 pounds per cc displacement, one can thus infer:

120hp/liter x 1 liter/1000cc x cc/1.1# = .109 hp/#, or 9.17 #/hp ...

OH SNAP!

Hyabusa 1300cc engine + Suzuki Swift = 1430-pound winnar...??

:026:

K