Attainable Efficiency I: Callaway C12

Boy, am I bored.

The mission: Ascertain the benefits from modifications that do not raise horsepower or decrease weight.

The vehicle: A bone-stock Callaway C12, no oil changes.

The track: Twin Ring Motegi - East Short Course.

The Test:

B-Spec Bob takes the wheel first for the control laps, using the bare-bones as-seen-on-TV C12, with a wing (but no downforce for this run) and glimmery Enkei 048 rims. This test, as the next, is run with R3 tires, as well as the 3 setting on the fast-o-meter. Both test runs are also done with the chassis stiffness boostage.

I'll give Bob about 20 laps to show us what he's made of.

By the way, before setting off here, I drove the C12 myself, just to see.

Perhaps I've been driving the GSX-R/4 too much, but this thing feels like a freaking TANK.

20 laps of Bobbing it yields a fastest lap of 1'30.655 in bonest-complete-stock-save-chassis-thingy form.

Now it's time to add the mods. Racing tranny. Racing flywheel. Uber clutch. Unobtainium driveshaft. Racing brakes. Anything that doesn't alter weight or power is on this car. Also, maximum downforce will now be applied, and ride height will be at it's lowest setting.

Another 20 laps from Der B-Spec should help determine what the attainable efficiency of adding these mods is.

With the mechanical bling, Bob rings up a golden lap of 1'28.918.

Therefore:

With mods, out of the box, and changing just ride height and downforce, you gain right around 1.91605537477248910705421653522% on stock (with chassis thingy) times.

Okay, yeah, that doesn't sound like much, but that's per lap, and that adds up, right?

Then again, this was an FR car, and that means we can stick a driveshaft in it.

I wonder what happens with, say, an NSX? Hmmm...
 
Amazing what a little powerless modification can do. And eh, you can drive what ever you want too much and short of the trucks, you'll be hard pressed to find a more tank like sports car then the C12. Typical american engineering built to the closest foot
 
I am disappointed. I have been running similar tests on an Alfa Romeo Guilia GTA. Stage 1 involved all unreversible mods: Weight reduction stage 3, Engine polish and engine balance. Total cost was high (can't remember exactly because I have misplaced my notes) and performance gain at Tsukuba was about 2.5 seconds per lap. Second stage was just carbon drive shafts, best flywheel, and best clutch. That gave me a 2 second per lap improvement at Tsukuba as well, for the miserly total of 7900 credits.

All tests were a-spec. So, if I can gain nearly 5 seconds at Tsukuba with a 10bhp change, or a 2 second improvement with no bhp change, I'm disappointed that boob..uh I mean bob... can only manage a 1.7 second improvement on a much longer circuit with all bells and whistles bar the hp.

Interesting test, thanks for posting!
 
It would be interesting to know if a similar result was obtained using sports tyres - it could be that a lot of the benefit from the improvments is being absorbed by using racing tyres
 
Moloch_horridus
It would be interesting to know if a similar result was obtained using sports tyres - it could be that a lot of the benefit from the improvments is being absorbed by using racing tyres

That's a good point. I did my tests on N2 tyres. Perhaps on R3s or something the gap would be much smaller.
 

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