Kent's TTS build/classing questions

[PaulB]

MODERATOR EDIT: We moved these posts from another thread to keep that one on topic and put this discussion in a more appropriate place.

Originally Posted by kcpaz

Well the goal for this car is somewhere around 2300lbs wet, and I'm about 200lbs so that means I can have somewhere in the neighborhood of 280hp and still stay in TTS, which is going to be VERY EASY to do with the 2.5 Subie turbo motor. The car will have 315mm tires in the rear, and 275mm tires in the front so I should have plenty of traction for such a light car. I think it will be fun.

I think it is a very cool idea, but you might recheck your math for classing?
(Just so you don't get caught out..)

Remember there is also a factor for weight that must be accounted for 2300lbs= -.90 or -.70 for 2500lbs
2300 (wet?)/280 with 315mm tires = 7.2 = ST1 or TTU
2300+200/280 with 315mm tires = 8.1 = ST1 or TTU

If you used a tiptronic or paddle shift - you would take another .2 off the adjusted power to weight to get to yourfinal adjusted power to weight, so the 2300lb figure would now be 7.0 adjusted.

[kcpaz]

This is the kind of info I need. So Paul, how heavy does it need to be with the proposed 315mm tires, and still stay in TTS? or maybe the better solution would be to reduce power.

[Tage]

http://www.nasaproracing.com/rules/

http://www.nasaproracing.com/rules/time_trial_rules.pdf

http://www.nasaproracing.com/rules/t...cation-sur.pdf

P.S. Kent, the easy solution is to tune the engine for max power and then simply detune any RPM that makes more than your allowed HP rating. Since TT/PT only cares about peak HP, this is the way to make a FAST car for the class.

Crap, did I just say that outloud and give my secrets away?

[travisjb]

Originally Posted by Tage

http://www.nasaproracing.com/rules/

http://www.nasaproracing.com/rules/time_trial_rules.pdf

http://www.nasaproracing.com/rules/t...cation-sur.pdf

P.S. Kent, the easy solution is to tune the engine for max power and then simply detune any RPM that makes more than your allowed HP rating. Since TT/PT only cares about peak HP, this is the way to make a FAST car for the class.

Crap, did I just say that outloud and give my secrets away?

capturing this in a quote so you can't ninja-edit! ... or maybe not, you're the admin!

[PaulB]

It's not the tires-I shouldn't of included those in the post

2637/280=9.41-.7(weight factor)=8.71 ST2 or TTU

[kcpaz]

I thought TTS was 8.7, so wouldn't 8.71 be TTS not TTU??? I think I'm confused.

[PaulB]

sorry your right ----->ST2=TTS...
Just remember it's not simply a raw pwr/lbs ratio...you might have to add or subtract for AWD/FWD, tire size, type, trans, weights also have various factors.

[kcpaz]

Yeah, I know, I looked at the rules before I declared that I was gunnin' for TTS. I just thought I had missed something. Now if I decided to run something other than an R-compound, then I would have to either add weight, or reduce horse power.

What are people doing to "regulate" boost. I mean, there has to be some sort of way for race officials to monitor boost (horsepower) levels during a run. I mean, what's to stop cheaters from running an "overboost" button or other shenanigans?

[AZElise]

Follow the link in google docs, select the proper tab at the bottom, input numbers and check the proper boxes. Much less brainpower required. It is not official but it seems to work.

http://nasaforums.com/viewtopic.php?...d67be390cf8fed

[PaulB]

here are the exact numbers for PT/TT


equal to or less than
3200 lbs -0.05 2750 lbs -0.5 2300 lbs -0.95 1850 lbs -1.4
3150 lbs -0.1 2700 lbs -0.55 2250 lbs -1.0 1800 lbs -1.45
3100 lbs -0.15 2650 lbs -0.6 2200 lbs -1.05 1750 lbs -1.5
3050 lbs -0.2 2600 lbs -0.65 2150 lbs -1.1 1700 lbs -1.55
3000 lbs -0.25 2550 lbs -0.7 2100 lbs -1.15 1650 lbs -1.6
2950 lbs -0.3 2500 lbs -0.75 2050 lbs -1.2 1600 lbs -1.65
2900 lbs -0.35 2450 lbs -0.8 2000 lbs -1.25 1550 lbs -1.7
2850 lbs -0.4 2400 lbs -0.85 1950 lbs -1.3 1500 lbs -1.75
2800 lbs -0.45 2350 lbs -0.9 1900 lbs -1.35 1450 lbs -1.8

equal to or greater than
3300 lbs +0.05 3550 lbs +0.35 3800 lbs +0.65 4050 lbs +0.9
3350 lbs +0.1 3600 lbs +0.4 3850 lbs +0.7 4100 lbs +0.95
3400 lbs +0.15 3650 lbs +0.45 3900 lbs +0.75 4150 lbs +1.0
3450 lbs +0.2 3700 lbs +0.55 3950 lbs +0.8 4200 lbs +1.05
3500 lbs +0.3 3750 lbs +0.6 4000 lbs +0.85 4250 lbs +1.1

These are the exact numbers for ST/TT


3300-3349 lbs +0.05 3550-3599 lbs +0.35 3800-3849 lbs +0.65 4050-4099 lbs +0.9
3350-3399 lbs +0.1 3600-3649 lbs +0.4 3850-3899 lbs +0.7 4100-4149 lbs +0.95
3400-3449 lbs +0.15 3650-3699 lbs +0.45 3900-3949 lbs +0.75 4150-4199 lbs +1.0
3450-3499 lbs +0.2 3700-3749 lbs +0.55 3950-3999 lbs +0.8 4200-4249 lbs +1.05
3500-3549 lbs +0.3 3750-3799 lbs +0.6 4000-4049 lbs +0.85 >4249 lbs +1.1

subtract if
3150-3051 lbs 0.05 2650-2551 lbs 0.3 2150-2051 lbs 0.55 1650-1551 lbs 0.8
3050-2951 lbs 0.1 2550-2451 lbs 0.35 2050-1951 lbs 0.6 1550-1451 lbs 0.85
2950-2851 lbs 0.15 2450-2351 lbs 0.4 1950-1851 lbs 0.65 < 1451 lbs 0.9
2850-2751 lbs 0.2 2350-2251 lbs 0.45 1850-1751 lbs 0.7
2750-2651 lbs 0.25 2250-2151 lbs 0.5 1750-1651 lbs 0.75

Just remember to use the PT factor for PT cars and the ST factor for ST cars...I think I used the PT numbers for KP's car so it's not that bad although as stated would be a ST1 or TTU..

We are here to help answer questions rather than make assumptions and end up with a car not in the class you wanted it to-
I love the spreadsheet but there was one floating around that was not correct so be careful.