Lightweight High Performance Coupe/Roadster competition

[gt1cooper]

CURRENT SCORES:

Spool: 188.7
Reaper392: 160.54
Pyrlix: 139
Nialloftara: 130
DarkJedi: 111
ONCE YOU UPDATE YOUR SCORE PM ME.
You have until next sunday to update or enter, at which point the scoring will be closed. For real this time
Here is the way this one works. Series of criteria, meet them, and anything else goes. Simple enough
RESPONSIVENESS HAS BEEN REDUCED! NO LONGER CAN YOU BUILD JUST AN ENGINE AND GET 120 POINTS!
Criteria for this one (Must meet, but not scored)
Year: 1994
All Aluminum Chassis and Panels (Engine is whatever you want)
Engine weight of under (Nothing?)
Engine man hours of under 90
Engine Cost of under $1600 (US, I do not know what conversions are needed)
2 door body, non hatch
For your fake weight, add the weight of your engine to 1800 lbs (816 kgs). For FWD remove 50 Lbs (23 kgs) & for AWD add 100 lbs (45 kgs)
Premium Unleaded
Mtbf over 35000 miles (56327 kms)
Must have a Cat
Sports compound road tires
Max front tyre width: 235 mm
No Max for rear tyres
Ride height: More than 7 inches (178 mm)
All else goes! We will use a grading system, as the scenarios do.

Base specs to go off of: (Scored)
Responsiveness will be graded from 40 (Each 1 above : +1) (Each 1 below : -3)
Ideal redline 7000, points taken off for below (Each 100 below : -3), no extra points for above
Acceleration 0-62 MPH (100 Km/h): 5.1 (Each .1 below : +3) (Each .1 above : -3)
Quarter mile time: 12.7 secs (Each .1 below :+ 3) (Each .1 above : -2)
Quarter mile speed: 124 mph (200 Km/h) (Each 1 MPH/1.6 KMH above : +2) (Each 1 MPH/1.6 KMH below : -1)
Top speed: 165 mph (266 km/h ) (Each 1 MPH/1.6 KMH) above : +1) (Each 1 MPH/1.6 KMH below : -1)
Cornering g's: 1.00 (Each .01 above : +5) (Each .01 below: -4)
Braking: 100 feet (Each 1 ft/.3 m below : +4) (Each 1 ft/.3 m above : -3)
Fuel efficiency: 29 MPG or 8.11 L/100 Km (Each 1 above : +3) (Each 1 below : -2) L/100km to mpg calculator: http://calculator-converter.com/l_100km_mpg_convert_mpg_to_l_per_100_km.php
Loudness: 45 (No points for under) (Each 1 above: -2)

Now I just need help with point values, and I would like to value handling, braking, and responsiveness over acceleration, with top speed last. So please help me with them

Put what you think in this thread, I will make a new one for the final competition.

As for prizes, I have no idea. Recognition? Will take suggestions on this topic

Baseline: 50 (A score which you should get above to submit)

This should be much more balanced and less restrictive.

[JMTC]

Are you looking for the all-aluminum requirement to include the body & chassis, or just for the engine?

[Frankschtaldt]

I don't really see an issue with leaving weight distribution as is for this.

You have a number of criteria to judge this on but is your intention to favor speed and accel as the primary criteria or do you mean to try and balance it so people can focus on other strengths?

[gt1cooper]

No, for this one early acceleration is favored over later, so for instance every .10 sec down on 0-60 will give you 5 pts, versus 1 through the quarter; the main focus will he handling, so emphasis will be placed there in the grading scale. I will be on later to start working on that scale.

The car is all aluminum in chassis and body to make there be an equal playing field. (Actually, now that I think about it, with the way we will calculate weight, this doesn't matter. Let's keep it this way, though, just to stick to the mid-high end small roadster a la lotus Elise just with a little more luxury and power). The engine, go wild. Keep in mind, engine man hours and cost have a play too.
Also, both fwd and rwd will be allowed. I am thinking 4wd too, but at a 350 lb weight penalty? And maybe a 50 lb weight deducting to fwd? (I don't think anyone will do fwd anyway)
First question from me: what transmission?

[Frankschtaldt]

I don't think anyone will do fwd anyway

Funny you should say that as the reason I asked what the focus would be is because I was considering having a go at this with a fwd car. Mostly just for something different.


As for gear box. My vote is leave it open. Let people use what ever they want. There's already enough restrictions imo.

[JMTC]

Are there, or should there be any requirements for octane and/or MTBF?

I would vote for both front and rear 2WD transmissions being accepted, but AWD seems to be outside the focus of a lightweight coupe concept.

[gt1cooper]

Ok, edited intro post. Let me know what you think.

Edit: Octane and MTBF are in the post.

[JMTC]

Should the loudness requirement be bumped up a little bit from 45? Playing with one of my engine candidates with the target RPM, the minimum loudness using cat + 2 mufflers is 46+.

[gt1cooper]

Maybe I will make it a graded requirement, where over loudness 45 takes off points but under does not add on points. My engine is at 42 with two straight through mufflers and a high flow 3 way cat.

[TheTom]

honestly, i don't like contest with that many restrictions. Because, let's face it, the goal is: build a NA I4 engine that weighs less than 300 pounds, costs less than 1300$ and makes as much power as possible. So we'll have to make it around 2 litres, i tried that out. We can't use turbochargers because that would be too expensive and too heavy, we can't use bigger engines because they would take too many man hours and we can't make eco-friendly engines because then we would lose points for the lower redline. Even the weight of the car and the ride height are determined. It will be boring to watch because all the results will be so similar.

Not that i can't build such a car, but i think there's not much room for diversity.

[Jakgoe]

Wow, that was really well spoken/written. After reading your post, I realize that you are right, and the competition will not involve much diversity.

[gt1cooper]

honestly, i don't like contest with that many restrictions. Because, let's face it, the goal is: build a NA I4 engine that weighs less than 300 pounds, costs less than 1300$ and makes as much power as possible. So we'll have to make it around 2 litres, i tried that out. We can't use turbochargers because that would be too expensive and too heavy, we can't use bigger engines because they would take too many man hours and we can't make eco-friendly engines because then we would lose points for the lower redline. Even the weight of the car and the ride height are determined. It will be boring to watch because all the results will be so similar.

Not that i can't build such a car, but i think there's not much room for diversity.

If you would like, I can increase the weight available, and the man hours, and perhaps the costs, but truth be told the reason for those restrictions are to place the car we are building into a marketplace. I am trying to make it balanced, however, so I will redo some things to adapt to your requests. Give me a minute.

[gt1cooper]

Updated. Leave your new thoughts, let me know if it will be well balanced.

[gt1cooper]

New edit, at the requests of Pyrlix. Should be more encouraging to diverse entries, as well as being more entertaining.

[darkjedi]

Here is a coupe you might enjoy. it scored 111 according to my calculations.

PS: you have to set the tire width to 235 on both front and rear as it is bugged and won't save that way