As the title says... I did a search and couldn't find it and I need it
Stephen
As the title says... I did a search and couldn't find it and I need it
Stephen
Here you go:
ITR: 11.25 lbs/hp
ITS: 12.9 lbs/hp
ITA: 14.5 lbs/hp
ITB: 17 lbs/hp
ITC: 18.84 lbs/hp
Also, here is a link to the "Advisory Committee Addendum - IT Process" (you'll need to log onto the members area of the website): https://ams.scca.com/netForum/eweb/documenttransfer.aspx?doc=scca_postings/filecabinet/Advisory%20Committee%20Addendum-%20IT%20Process.pdf
It lists the figures above, and also explains the process, include what adders & subtractors are used.
Earl R.
240SX
ITA/ST5
Looking for some more generic info on this topic... Nothing to argue about here!!
I would like to get as much info for each car in each class on power to weight ability/options.
What cars do you know that have added ballast to meet minimum weight for the class? Which ones have a hard time meeting minimum weight? Any info you have is helpful for me, if a spreadsheet already exists hook me up with who may have it! Looking more at ITR, ITS, and ITA since ITB is going through lots of changes in the next year or so but if you have the details feel free to share hem with me and I can adjust later.
Stephen
Example
ITR RX8. 75lbs over, another 10-20lbs is achievable before getting creative.
ITB Audi Coupe. 50lbs under without trying.
Stephen
And remember...do NOT just take the weight of a car and divide it by that number and expect that crank HP to work out. The calculation works like this:
Stock HP x expected/estimated increase with IT prep (usually 25%)...THEN adders are used. FWD, DW, torque, etc.
Understood. I am just trying to nip the comments coming when people just use the number to back calculate without adders.
For you, remember adders when you are estimating.
Sorry - I just thought you were looking for the P/W ratios...kinda like the title says
The only cars I know anything about are the ITA 240SX and the ITR Camaro/Firebird. The 240SX coupe has no trouble making weight, the hatch needs a little work to get there (mine is ~ 70 lbs heavy with a 260 lb driver).
The Camaro/Firebird in ITR will not get close to weight IMO. That's only based on calculations, but I do know mine (hardtop) weighs right at 3350 w/o driver (and 1/4 tank of fuel). Add even 180 for the driver and 100 for a cage, and it would have to lose over 800 lbs to make ITR weight. Everything I've been able to dig up on the car says 450-500 lbs is doable, but not 800. Which means it is going to be at least 250, probably closer to 300 lbs heavy. In a class where it's already outclassed...
Earl R.
240SX
ITA/ST5
[QUOTE=erlrich;348962]Sorry - I just thought you were looking for the P/W ratios...kinda like the title says
T/QUOTE]
I was . Then decided to build on that without creating a new thread...
Stephen
You're looking for a metric crap-ton of data, about 7/8ths of a metric crap-ton of which is going to be wild-assed guesses.
:026:
K
^ I concur. Also question your margin of error acceptance. I usually weigh in at 2330 with 1/2 tank and the min weight is 2270. If I lost the cool suit setup, 1/4 of gas and my fat ass (190) lost 15 lbs (which I should), I would be at 2280. Is 60 lbs within margin? Are you looking for widely off cars that have 250 lbs of ballast? or with no ballast at all that still tip the scales at 250 lbs overweight?
Demetrius Mossaidis aka 'Mickey' #12 ITA NESCCA
'92 Honda Civic Si
STFU and "Then write a letter. www.crbscca.com"
2013 ITA NARRC Champion and I have not raced since.
Perhaps a little of topic, but do usually cars with thin (180-190Lbs) drivers win their classes?? Or heavy driver win their share?
Efrain N Alers
Nativo Performance
787-635-9546
My 1972 911E IT-S Porsche 911 weighed in at 2350 with me on board (180 lbs suited up) and I had to add 250 lbs of ballast to meet the SCCA mandated 2585 lbs based on their wild ass guess as to makeable HP. (insert frustrated emoticon here)
Given the number of factors that influence "speed" or "lap time" the difference between a 150# driver and a 200# driver isn't even repeatable lap-to-lap by a typical club racer, let alone the influence of that factor on "winning."
K
What ^ said; plus I would be willing to bet if you could determine the overall proportion of XL drivers to average/thin drivers in club racing, the proportion running up front is almost the same. I know a few big boys who can wheel a car real good.
Earl R.
240SX
ITA/ST5
Jake Gulick
CarriageHouse Motorsports
for sale: 2003 Audi A4 Quattro, clean, serviced, dark green, auto, sunroof, tan leather with 75K miles.
IT-7 #57 RX-7 race car
Porsche 1973 911E street/fun car
BMW 2003 M3 cab, sun car.
GMC Sierra Tow Vehicle
New England Region
lateapex911(at)gmail(dot)com
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