V6 Mustang for SCCA ITR Class - Ford Mustang Forums : Corral.net Mustang Forum
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post #1 of 3 Old 08-15-2006, 05:56 PM Thread Starter
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Question V6 Mustang for SCCA ITR Class

I'm interested in some rear wheel horsepower figures for late model (99-03) V6 Mustangs, and this looks like the place to get them.

The SCCA is creating a new class called ITR, which is short for Improved Touring R. It'd be the fastest of the IT series, previously S was the fastest IT class.

IT is a road racing class with the empathsis on handling, not motor. Therefore, per the rules the suspension is basically free, but the motor modifications are relatively limited. As such, on the Mustang motor all you could do would be:

*Exhaust is free - do what you like
*0.5 compression bump
*No cam changes at all
*No throttle body or MAF changes
*ECU is free, so you can use MoTec, MegaSquirt, etc.
*Porting can only be done 1" into the head/intake and is for port matching only (yeah right)
*Valves must remain stock size
*3 angle valve job can be done
*Ignition timing is free
*All gearing is free

I'm trying to get an idea of what one of these motors might do in rear wheel trim. Now, before you say "Not much, not enough modifications", ear in mind a legal BMW 325i motor in IT trim (189hp stock) can lay down 215-220 rwhp on a Dynojet. A good old Datsun 240Z (150hp stock) can make about 190 rwhp on a Dynojet. So, understand the racers will take exhaust to the Nth degree, ditto everything else they legally can, and maybe a bit beyond to make every last 1,2, or 3 hp and it all adds up.

Anyone have any reasonable guesstimates on hp levels obtainable?

Thanks much,

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post #2 of 3 Old 08-24-2006, 11:23 AM
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are there displacement restriction or something? why look at a v6 for this class?


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post #3 of 3 Old 08-31-2006, 08:05 AM
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Don't even think about it. Look at the other cars in the class ... Porsche 911 & 928, '94/'95 Mustang 5.0, Toyota Supra, BMW M3, Nissan 300ZX/Z32, etc. The '99/'04 Mustang V6 really belongs in ITS along w/the '94/'98 Mustang V6 (tho w/slightly more weight due to the HP increase). Also, SCCA has mistakenly classified the Mustang V6 as a SOHC engine. Not to mention that the given weight of 2,670 lbs is impossible to get to w/in the IT rules. Hell, even the 5.0 would be a tough sell in the class as long as it is forced to run the OE calipers & rotors. Good luck if you still wish to pursue this project, but please think it thru before investing your hard earned $$$.

'98 GT equipped w/Koni, Eibach, Cobra R rims w/Yokohama tires, Cobra brakes all around & 3.73 gears. Also a Boss330 4.6 Cobra block w/PI heads & stuff from Accufab, ARP, Centerforce, Comp Cams, Fidanza, K&N, Mahle, Manley & Borla exhaust w/Mac Pro Chamber thrown in for grins & giggles.
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