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Tech Talk => Engine Mechanical / Electrical => Topic started by: 69kona on May 18, 2017, 10:05:25 AM

Title: Nitrous Plate jet Spread question
Post by: 69kona on May 18, 2017, 10:05:25 AM

Gonna go out and test nitrous. Last season on the old motor (still lives) lol I had 53n 47f jets 6.5 flowing  fuel pressure and it was rich. I want to clean the tune up especially it being a new motor now . I have a Cheater plate current generation. Should I widen the spread or drop fuel pressure ? Thanks


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Title: Re: Nitrous Plate jet Spread question
Post by: 69kona on May 18, 2017, 02:36:32 PM

Was gonna order some jets ...


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Title: Re: Nitrous Plate jet Spread question
Post by: izzy on May 18, 2017, 07:04:08 PM

I would put a 63n jet in there and leave the fuel jet and fuel pressure the same, but it depends on what kinda shot your motor can handle, are you looking for the "beat Jamie" tune???


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Title: Re: Nitrous Plate jet Spread question
Post by: 69kona on May 18, 2017, 07:30:53 PM

Quote from: izzy on May 18, 2017, 07:04:08 PM

I would put a 63n jet in there and leave the fuel jet and fuel pressure the same, but it depends on what kinda shot your motor can handle, are you looking for the "beat Jamie" tune???


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Yes sir that's my plan



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Title: Re: Nitrous Plate jet Spread question
Post by: izzy on May 18, 2017, 07:50:24 PM

From what I seen, if you run that tune, with some timing retard of course, that will be a good race


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Title: Re: Nitrous Plate jet Spread question
Post by: mach1_557 on May 18, 2017, 11:05:14 PM

How much timing are you taking out on that tune up. Those Jets sound like a 100-125hp?

Title: Re: Nitrous Plate jet Spread question
Post by: 69kona on May 19, 2017, 05:09:14 AM

Quote from: mach1_557 on May 18, 2017, 11:05:14 PM

How much timing are you taking out on that tune up. Those Jets sound like a 100-125hp?

Taking out 3 degrees ...


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Title: Re: Nitrous Plate jet Spread question
Post by: Six-Oh-Nine on May 19, 2017, 07:28:20 AM

Quote from: 69kona on May 19, 2017, 05:09:14 AM

Taking out 3 degrees ...


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Might want to consider pulling a little bit more timing.


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Title: Re: Nitrous Plate jet Spread question
Post by: 69kona on May 19, 2017, 07:54:34 AM

Quote from: Six-Oh-Nine on May 19, 2017, 07:28:20 AM

Might want to consider pulling a little bit more timing.


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James for a 125 shot does a 6 jet spread with 6.5 flow fuel pressure still gonna be rich ? 5 degrees retard ?


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Title: Re: Nitrous Plate jet Spread question
Post by: 69kona on May 20, 2017, 10:21:06 AM

Quote from: 69kona on May 19, 2017, 07:54:34 AM

James for a 125 shot does a 6 jet spread with 6.5 flow fuel pressure still gonna be rich ? 5 degrees retard ?


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Bostick...?


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Title: Re: Nitrous Plate jet Spread question
Post by: 69kona on May 21, 2017, 01:59:36 PM

?


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Title: Re: Nitrous Plate jet Spread question
Post by: mach1_557 on May 23, 2017, 05:46:31 AM

It's really hard for someone to give advice when the spark plugs tell the tale of what your tune-up is doing. The best thing you could do is go off of the jetting chart for that plate, and read the plugs from there with fuel and timing adjustment. Take out 2 degrees for every 50hp.  Every engine is different and likes different adjustments.

Title: Re: Nitrous Plate jet Spread question
Post by: Six-Oh-Nine on May 31, 2017, 09:20:32 PM

63/47 6.5 ought to get you in the ballpark... but pull timing... timing is not your friend on nitrous and less ain't gonna hurt near as much as just a little too much.


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