Nasa TT Chit Chat
Joined: Apr 2010
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Everyone prepping their car for the current TT rules, should keep one eye on the future ST/TT rules proposal. Seems likely they will be enacted for next year (2017). In many ways it could simplify the modifications, but will certainly require everyone to have dyno sheets
Joined: Nov 2011
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Originally Posted by BlueBarchetta' timestamp='1455406909' post='23880048
Everyone prepping their car for the current TT rules, should keep one eye on the future ST/TT rules proposal. Seems likely they will be enacted for next year (2017). In many ways it could simplify the modifications, but will certainly require everyone to have dyno sheets
Registered User
Joined: Jul 2014
Posts: 2,629
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From: Fort Walton Beach, FL
I will be running my turbo S2000 in NASA TT3 (10:1) class this year. My numbers look like this:
3000 lb competition weight
322 average whp
-.7 245 Hoosier A7s
9.3:1 weight
ower ratio
That is the way everyone needs to being thinking for next season if rumors are to be believed. The competition is mostly cheatty Evos and detuned Corvettes in TT3.
3000 lb competition weight
322 average whp
-.7 245 Hoosier A7s
9.3:1 weight
ower ratioThat is the way everyone needs to being thinking for next season if rumors are to be believed. The competition is mostly cheatty Evos and detuned Corvettes in TT3.
Joined: Oct 2012
Posts: 148
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please tell me about the cheatty evos? lol. Because i drive an evo in TT3, the new power requirement is a pain in the butt but ecu controlled boost helps make the power curve a little more doable. the corvettes are the real problem.
im trying to slowly mod my s2000 into TT, but i hadn't heard the TT4 rumor so thats good to know.
im trying to slowly mod my s2000 into TT, but i hadn't heard the TT4 rumor so thats good to know.
Registered User
Joined: Jul 2014
Posts: 2,629
Likes: 53
From: Fort Walton Beach, FL
please tell me about the cheatty evos? lol. Because i drive an evo in TT3, the new power requirement is a pain in the butt but ecu controlled boost helps make the power curve a little more doable. the corvettes are the real problem.
im trying to slowly mod my s2000 into TT, but i hadn't heard the TT4 rumor so thats good to know.
im trying to slowly mod my s2000 into TT, but i hadn't heard the TT4 rumor so thats good to know.
Joined: Jul 2002
Posts: 2,724
Likes: 42
From: Orlando
The Trick to TT is to sit down and figure out your HP to weight after the modifiers and pick your car based on that.
So TTC is
12.0:1
So the S2000 takes modifiers for things like smaller then 245 tire and then being 2850 lbs to make it's adjusted HP/weight of 11.60:1
So that's 245.69whp But to be competitive you don't want to just tap 245 whp right at redline, you want to make it at a lower RPM and then tune to top off and make that hp for as long a period of time as possible. Seeing as your allowed to take the motor apart and bump the compression .5 for an all out build that to me at least seems necessary when your trying to beat a car that gets to take tons of modifiers like lets just take something easy like a 4 door fwd car that gets to weigh lets say 2850 and have a turbo.
12.0
-.8 tires
-.2 4 door
-1.0 FWD
+.4 weight
That's 10.4:1 and if it's a turbo car that means it can flatten that TQ curve so that it makes that 10.4:1 for as long as it wants. Which is 274.04 whp at the same weight with the same tire with likely a flatter TQ curve.
We did that on the TTD Civic (even though the owner didn't buy a 4 door car ARRGH). But we make at the max adjusted hp for 1000 rpm before redline. And the car holds the TTD record which happens to be faster then any N/A TTC legal S2000 has gone at sebring. Now Chi's car which holds the TTC record was a Turbo S2000 with all the boost blown off up top so that it only made 216whp. On our lap record lap it was 4 mph slower on the straight then the Civic (124mph vs 128mph in the civic). So it really only made 216whp, But it made 216whp from 5000 rpm to redline. On the data it wasn't that it was faster on the straights, it was faster by a lot out of the corners and you could run a gear higher everywhere saving a shift. Overlaying the data between his car N/A and his car with the small turbo was pretty interesting. But his dyno reclass was also 2950lbs so it was 100lbs heavier then a normal S2000 and his dyno reclass was some 30hp less.
If you take a dyno reclass Greg usually gives you 10% to 15% less power then you could in theory make on points. So that's NOT the way to go.
So TTC is
12.0:1
So the S2000 takes modifiers for things like smaller then 245 tire and then being 2850 lbs to make it's adjusted HP/weight of 11.60:1
So that's 245.69whp But to be competitive you don't want to just tap 245 whp right at redline, you want to make it at a lower RPM and then tune to top off and make that hp for as long a period of time as possible. Seeing as your allowed to take the motor apart and bump the compression .5 for an all out build that to me at least seems necessary when your trying to beat a car that gets to take tons of modifiers like lets just take something easy like a 4 door fwd car that gets to weigh lets say 2850 and have a turbo.
12.0
-.8 tires
-.2 4 door
-1.0 FWD
+.4 weight
That's 10.4:1 and if it's a turbo car that means it can flatten that TQ curve so that it makes that 10.4:1 for as long as it wants. Which is 274.04 whp at the same weight with the same tire with likely a flatter TQ curve.
We did that on the TTD Civic (even though the owner didn't buy a 4 door car ARRGH). But we make at the max adjusted hp for 1000 rpm before redline. And the car holds the TTD record which happens to be faster then any N/A TTC legal S2000 has gone at sebring. Now Chi's car which holds the TTC record was a Turbo S2000 with all the boost blown off up top so that it only made 216whp. On our lap record lap it was 4 mph slower on the straight then the Civic (124mph vs 128mph in the civic). So it really only made 216whp, But it made 216whp from 5000 rpm to redline. On the data it wasn't that it was faster on the straights, it was faster by a lot out of the corners and you could run a gear higher everywhere saving a shift. Overlaying the data between his car N/A and his car with the small turbo was pretty interesting. But his dyno reclass was also 2950lbs so it was 100lbs heavier then a normal S2000 and his dyno reclass was some 30hp less.
If you take a dyno reclass Greg usually gives you 10% to 15% less power then you could in theory make on points. So that's NOT the way to go.
Joined: Apr 2010
Posts: 570
Likes: 16
Originally Posted by imstimpy' timestamp='1455545044' post='23881029
My CR, built to SCCA STR rules, is maxed in TTB with 225 Hoosier R7s. However, many of the points I have for STR translate to minimal gains in TT. The car really needs a dyno reclass anyway. Next year's rules should help with that, hopefully.
Code:
Base TTC** 14 A.Tires 8) UTQG over 40 6 3) Hoosier R7 10 10) 255 0 10) -30mm -7 C. Engine 4) Intake 1 10) Pulleys 1 22) Exhaust 5 D. Drivetrain 6) LSD 1 E. Suspension 1) Remote reservoirs 8 6) Springs 2 7) Anti-roll bars 2 F. Brakes/Chassis 1) BBK 2 Total 42 39
Joined: Oct 2012
Posts: 148
Likes: 0
I'm still trying to figure out how to go about shaping the power curve with the new averaging rules.
Joined: Jul 2007
Posts: 2,101
Likes: 27
From: Ohio
Originally Posted by King Tut' timestamp='1455644408' post='23882190
No AWD dyno means no way to verify horsepower. Not saying the RWD cars probably don't do it at regional events with no 2WD dyno either.