4.1 turbo 640 cubes November 10, 2019 10:40AM
With the East Coast pulling organization any idea if they have given any thought on about letting the 4.1 640 run with the 540 p-pump and any single turbo size. It would seem like the two classes would be pretty much equal and would work out really good. Thank you
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Re: 4.1 turbo 640 cubes November 10, 2019 10:35PM
It works for the OSTPA and puts on a good show!
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Re: 4.1 turbo 640 cubes November 11, 2019 05:35AM
Same in Indiana with IPL.
But remember, NTPA Light PS is not any size single turbo. Those tractors usually compose the combo Light & Limited PS class.
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Re: 4.1 turbo 640 cubes November 11, 2019 10:59PM
what size turbo are they allowed then for NTPA then
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Re: 4.1 turbo 640 cubes November 11, 2019 11:34PM
NTPA Light and Limited Pros are limited to a 4.1 turbo
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Re: 4.1 turbo 640 cubes November 12, 2019 04:30AM
Right rear tire, I believe that you are wrong on the NTPA light pro's. They are allowed any size compressor wheel with a g trim exhaust. The Limited pros are limited to a 4.1 inlet. Just saying.
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Re: 4.1 turbo 640 cubes November 12, 2019 12:25PM
That what I thought it was but I thought maybe they were talking about the 640 4.1
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Re: 4.1 turbo 640 cubes November 12, 2019 01:59PM
Light pros are limited to 540 cubic inches as well as unlimited inducer wheel and g trim exhaust
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Re: 4.1 turbo 640 cubes November 13, 2019 12:06AM
No, NTPA Light Pros got rules changed for 2019. 4.5 charger is max size

edit: 4.5 not 4.1

[www.pulloff.com]



Edited 1 time(s). Last edit at 11/13/2019 12:07AM by theRightRearTire183.
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Re: 4.1 turbo 640 cubes November 13, 2019 01:09AM
Quote
In the know
Light pros are limited to 540 cubic inches as well as unlimited inducer wheel and g trim exhaust

^^^ This is correct. BTW, G-trim is 4.365 out of the exducer, not 4.5.

CP
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Re: 4.1 turbo 640 cubes November 13, 2019 07:52AM
4.5 on the exhaust side. Unlimited on air side?
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Re: 4.1 turbo 640 cubes November 15, 2019 09:39AM
The 640 4.1s will not hang with the 540s unlimited chargers. 540s are making up to 3000 hp.
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Re: 4.1 turbo 640 cubes November 15, 2019 10:21AM
As a sled operator, I've never personally hooked the combined class. But I have to think the 4.1's have a bit of an advantage with their weight & torque. Light pro's will get up & fly on a good track but sort of jump out of the ground on the big end where a 4.1 can run just as fast but will lug & tug better than the light pro's. Just my $.02 worth....
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Re: 4.1 turbo 640 cubes November 17, 2019 11:38PM
Logan wasnt you the sled operator at the ostpa pull at the muskingum raceway pull in the spring. You hooked the OSTPA 9000 light/limited pro stock combo class there. As for the original question combining those 2 classes works out great, in OSTPA it is very split on winners. The lights that run it all the time like to complain alot saying it's not fair but anytime a good light comes they compete very well and alot of the time beat any of the limiteds.
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Re: 4.1 turbo 640 cubes November 18, 2019 04:09AM
The Muskingum speedway pull had 2 light pros in the 1 and 2 spots. If it would have been a good track there would have been even more light pros at the top and the distance spread would have been even greater! 640s wont hang with the top of the class Light pro tractors. Just a fact.
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Re: 4.1 turbo 640 cubes November 18, 2019 01:13PM
Out west not many light pros yet, ones I've seen are built right and pulled against and didn't show any more than 4.1's, but they are in the early stages out west, Darin
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Re: 4.1 turbo 640 cubes November 18, 2019 01:44PM
The 4.1’s out west don’t want anything to do with the light pro’s out west, just ask them
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Re: 4.1 turbo 640 cubes November 19, 2019 03:52AM
They dont want anything to do with Eastern region NTPA Lps either. Especially Region 2.
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