NTPA pro stock classes turbo limits June 18, 2023 10:08AM
For those of us who don't have rule books can some list the turbo size limits for all NTPA prostock classes

Re: NTPA pro stock classes turbo limits June 21, 2023 08:29AM
Pro Stock limited to 6 inch inlet and exhaust. Heavy Pro Stock (RN) is 5 inch smooth bore inlet--5.370 inch exhaust outlet (box turbo). The Light Pro Stock turbo is limited to a 4.5 inch exhaust with unlimited inlet size. The Limited Pro Stock turbo is limited to 4.1 inch smooth bore inlet with no Map ring allowed and a 4.5 inch exhaust outlet. Super Farm turbos are 3 x 3 with additional restrictions that are too lengthy to put here!! Pro Farm turbo is a 3 x 3 smooth bore in and out and a Hot Farm is a 3 inch in x 3 1/2 out, HF and PF are state/region only>

Re: NTPA pro stock classes turbo limits June 21, 2023 09:19AM
Quote
bandit496
Pro Stock limited to 6 inch inlet and exhaust. Heavy Pro Stock (RN) is 5 inch smooth bore inlet--5.370 inch exhaust outlet (box turbo). The Light Pro Stock turbo is limited to a 4.5 inch exhaust with unlimited inlet size. The Limited Pro Stock turbo is limited to 4.1 inch smooth bore inlet with no Map ring allowed and a 4.5 inch exhaust outlet. Super Farm turbos are 3 x 3 with additional restrictions that are too lengthy to put here!! Pro Farm turbo is a 3 x 3 smooth bore in and out and a Hot Farm is a 3 inch in x 3 1/2 out, HF and PF are state/region only>

What about Classic SS? (just kidding but someone knows).

Re: NTPA pro stock classes turbo limits June 23, 2023 03:10AM
Haha,,,,they asked for Pro classes and I did go a little overboard with the SF, HF, and PF--lol

Re: NTPA pro stock classes turbo limits June 21, 2023 12:27PM
There’s not a 6.0 in and out turbo in that big PS class!

Re: NTPA pro stock classes turbo limits June 21, 2023 02:20PM
I thought it was unlimited inlet size and exhaust was 6.0 inches.



Brent Yaron
Hooked Up Pulling Productions
hookeduppullingproductions@gmail.com

Re: NTPA pro stock classes turbo limits June 21, 2023 05:27PM
Correct. 6.0 bore spec on exducer. Inlet is open. 6.4+ anyone? No? No one admits that? Hehehe...

CP

Re: NTPA pro stock classes turbo limits June 22, 2023 10:58AM
What is the box turbo, some sort of Holset? and who are the suppliers?

Re: NTPA pro stock classes turbo limits June 22, 2023 12:37PM
Wimer only for now

Re: NTPA pro stock classes turbo limits June 22, 2023 12:16AM
Classic super stock is 2.75” inlet and 3” outlet

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