2012 24Hrs of Daytona Lounge
01-28-2012, 08:35 PM
#53
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None of the cars out there in the race use forced induction. I don't believe it's allowed for any engine. The 20b's in the GT class RX-8s are around 450hp N/A.
Edit:
And yes, the tail lights are the same as the OEM street taillights. They probably modify them or use different bulbs for the 24hr race, since they appear quite a bit brighter, but when I crewed for the #69 last year at Lime Rock, I was humored to note that the #69's right rear tail light had lots of moisture and a bit of water accumulation
Edit:
And yes, the tail lights are the same as the OEM street taillights. They probably modify them or use different bulbs for the 24hr race, since they appear quite a bit brighter, but when I crewed for the #69 last year at Lime Rock, I was humored to note that the #69's right rear tail light had lots of moisture and a bit of water accumulation
Last edited by RIWWP; 01-28-2012 at 08:39 PM.
01-28-2012, 08:40 PM
#56
Why I was wondering this ...
The rest of the GT cars .. are they are running engines that can be purchased from the show room?
If yes
How does mazda get away with running an engine not offered to the public?
And I wish they did. <sigh>
---edit---
And why are they not running any boost?
The rest of the GT cars .. are they are running engines that can be purchased from the show room?
If yes
How does mazda get away with running an engine not offered to the public?
And I wish they did. <sigh>
---edit---
And why are they not running any boost?
How do they get away with it? At the time Mazda started racing the RX8, there was only about 2 different types of cars in GT. Grand Am changed the rules so they could have more variety.
Half of the ones still out there now probably won't finish the race.
01-28-2012, 08:43 PM
#58
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Hmm, either these PDFs are massive, or there is something blocking my download...
http://www.grand-am.com/news/index.cfm?cid=13517&rr=no
I was getting blocked. Appears that they rule it available due to having been available for the Cosmo:
Some more excerpts:
I'm guessing Al is correct in that they waived 2-3.3 for the RX-8 under the 2-3.1 rule
http://www.grand-am.com/news/index.cfm?cid=13517&rr=no
I was getting blocked. Appears that they rule it available due to having been available for the Cosmo:
Mazda RX8 (Prep 2)
Weight: Minimum weight 2260 lbs or 2350 lbs with DP transaxle.
Tire size: 285/645R18 front 305/660R18 rear.
Fuel capacity 19.5 gallons.
20B Cosmo three rotor (Mazda Spec parts).
2.0 liter, 9.7 compression ratio, 3-52mm throttle bodies, maximum of 6 injectors, maximum fuel pressure 4.2 bar, free. Maximum RPM 8900. Call GRAND-AM for parts list at386-310-6500.
Six-speed transmission.
Maximum body width is 73.5 inches.
Engine set-back 5.125 inches from spindle centerline to 1st spark plug.
Complete rear wing height w/ end plates cannot exceed roof height. Fuel rig must be fitted with a (color t.b.d.) .970 inch restrictor used to connect the clear 1.5-inch ID fuel hose to the clear 2 ¼ inch ID hose on the dry break fueling probe.
Car must have 2 ½ inches minimum ground clearance.
Approved Modifications:
Intake manifold is Free
May use oil in fuel
Allowed larger/higher exhaust position.
2009 Mazda RX-8 “R3” bodywork permitted with 3” maximum front splitter dimension.
Weight: Minimum weight 2260 lbs or 2350 lbs with DP transaxle.
Tire size: 285/645R18 front 305/660R18 rear.
Fuel capacity 19.5 gallons.
20B Cosmo three rotor (Mazda Spec parts).
2.0 liter, 9.7 compression ratio, 3-52mm throttle bodies, maximum of 6 injectors, maximum fuel pressure 4.2 bar, free. Maximum RPM 8900. Call GRAND-AM for parts list at386-310-6500.
Six-speed transmission.
Maximum body width is 73.5 inches.
Engine set-back 5.125 inches from spindle centerline to 1st spark plug.
Complete rear wing height w/ end plates cannot exceed roof height. Fuel rig must be fitted with a (color t.b.d.) .970 inch restrictor used to connect the clear 1.5-inch ID fuel hose to the clear 2 ¼ inch ID hose on the dry break fueling probe.
Car must have 2 ½ inches minimum ground clearance.
Approved Modifications:
Intake manifold is Free
May use oil in fuel
Allowed larger/higher exhaust position.
2009 Mazda RX-8 “R3” bodywork permitted with 3” maximum front splitter dimension.
Some more excerpts:
1-3.2. Semi-Tube GT (“Prep 2 GT”) - This category is for cars with modified production or tube-frame chassis. They may be front-wheel drive cars converted to rear-wheel drive or they may be cars that require physical modifications to be competitive in GT. Specified tube-frame construction is permitted. Alternative engines from the original manufacturer may be approved.
SECTION 2 - GENERAL ENGINE REGULATIONS
2-1 Eligibility
2-1.1 The eligible engines will be determined, selected and approved by GRAND-AM and listed along with the engine specifications, specified components and performance levels in the GT-SCR, which must be strictly adhered to.
2-1.2 To be approved, engines may be required to be submitted to GRAND-AM for testing and analysis.
2-1.3 GRAND-AM may approve alternate engines from the
2-1 Eligibility
2-1.1 The eligible engines will be determined, selected and approved by GRAND-AM and listed along with the engine specifications, specified components and performance levels in the GT-SCR, which must be strictly adhered to.
2-1.2 To be approved, engines may be required to be submitted to GRAND-AM for testing and analysis.
2-1.3 GRAND-AM may approve alternate engines from the
2-3 General Engine Requirements.
2-3.1 All engines must be production-based. (GRAND-AM may require changes in bore and stroke or other specifications in some circumstances.) GRAND-AM may approve other engines.
2-3.2 Maximum engine RPM, throttle body size/diameter, valve lift and size, and the maximum compression ratio may be specified for each approved engine. Engine air box and inlet air restrictors may also be required.
2-3.3 It is mandatory that all major components and parts be for sale to the general public in a regular product offering. GRAND-AM must approve all components/parts prior to use in competition.
2-3.4 All approved components/parts and modifications will be specifically listed for each eligible engine. See GT-SCR.
2-3.5 Engines must be normally aspirated. (Exceptions may be listed in the GT-SCR.)
2-3.1 All engines must be production-based. (GRAND-AM may require changes in bore and stroke or other specifications in some circumstances.) GRAND-AM may approve other engines.
2-3.2 Maximum engine RPM, throttle body size/diameter, valve lift and size, and the maximum compression ratio may be specified for each approved engine. Engine air box and inlet air restrictors may also be required.
2-3.3 It is mandatory that all major components and parts be for sale to the general public in a regular product offering. GRAND-AM must approve all components/parts prior to use in competition.
2-3.4 All approved components/parts and modifications will be specifically listed for each eligible engine. See GT-SCR.
2-3.5 Engines must be normally aspirated. (Exceptions may be listed in the GT-SCR.)
Last edited by RIWWP; 01-28-2012 at 08:49 PM.
01-28-2012, 08:47 PM
#61
Hmm, either these PDFs are massive, or there is something blocking my download...
http://www.grand-am.com/news/index.cfm?cid=13517&rr=no
I was getting blocked. Appears that they rule it available due to having been available for the Cosmo:
http://www.grand-am.com/news/index.cfm?cid=13517&rr=no
I was getting blocked. Appears that they rule it available due to having been available for the Cosmo:
Thanks for the link
I'm going for a beer ... anyone need one?
01-28-2012, 08:59 PM
#66
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Yeah, WAY into the braking zone, but he held it. 
I'm thinking it threw the 40 off his focus just enough, causing him to drive wide into the concrete area, picked up crap on the tires and couldn't hold the mustang behind him.
I'm thinking it threw the 40 off his focus just enough, causing him to drive wide into the concrete area, picked up crap on the tires and couldn't hold the mustang behind him.
