Big shot help
11-01-2008, 11:42 PM
#41
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That's a lot of spread, but Robin mentioned he's experienced similar requirements.
I would get that fuel psi back up. I'd be scared to run anything less than 5 1/2.
What does your a/f look like on motor?
Sounds like you need both a bigger spread and/or possibly more bottle pressure. Although I say that, I personally liked trying to keep my tune up pressure around 1050 just because it was so much faster to get there between rounds.
My last tune up was a 2 jet spread with 6 1/4 psi of fuel and 1050 on the bottle. At 6 psi I would see one aluminum ball on the base of the plug when looking at with a 30x mag. That was perfect power but I'd add a 1/4 lbs to be safe since I ate two motors and was too full to eat anymore
Bottom line is if your motor tune is good and won't be changed you have to add more nitrous. You should get that fuel psi back up as it's too close to the slightest hickup causing dinner time (and on the menu is your motor).
I would get that fuel psi back up. I'd be scared to run anything less than 5 1/2.
What does your a/f look like on motor?
Sounds like you need both a bigger spread and/or possibly more bottle pressure. Although I say that, I personally liked trying to keep my tune up pressure around 1050 just because it was so much faster to get there between rounds.
My last tune up was a 2 jet spread with 6 1/4 psi of fuel and 1050 on the bottle. At 6 psi I would see one aluminum ball on the base of the plug when looking at with a 30x mag. That was perfect power but I'd add a 1/4 lbs to be safe since I ate two motors and was too full to eat anymore
Bottom line is if your motor tune is good and won't be changed you have to add more nitrous. You should get that fuel psi back up as it's too close to the slightest hickup causing dinner time (and on the menu is your motor).
11-02-2008, 12:00 AM
#42
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That's a lot of spread, but Robin mentioned he's experienced similar requirements.
I would get that fuel psi back up. I'd be scared to run anything less than 5 1/2.
What does your a/f look like on motor?
Sounds like you need both a bigger spread and/or possibly more bottle pressure. Although I say that, I personally liked trying to keep my tune up pressure around 1050 just because it was so much faster to get there between rounds.
My last tune up was a 2 jet spread with 6 1/4 psi of fuel and 1050 on the bottle. At 6 psi I would see one aluminum ball on the base of the plug when looking at with a 30x mag. That was perfect power but I'd add a 1/4 lbs to be safe since I ate two motors and was too full to eat anymore
Bottom line is if your motor tune is good and won't be changed you have to add more nitrous. You should get that fuel psi back up as it's too close to the slightest hickup causing dinner time (and on the menu is your motor).
I would get that fuel psi back up. I'd be scared to run anything less than 5 1/2.
What does your a/f look like on motor?
Sounds like you need both a bigger spread and/or possibly more bottle pressure. Although I say that, I personally liked trying to keep my tune up pressure around 1050 just because it was so much faster to get there between rounds.
My last tune up was a 2 jet spread with 6 1/4 psi of fuel and 1050 on the bottle. At 6 psi I would see one aluminum ball on the base of the plug when looking at with a 30x mag. That was perfect power but I'd add a 1/4 lbs to be safe since I ate two motors and was too full to eat anymore
Bottom line is if your motor tune is good and won't be changed you have to add more nitrous. You should get that fuel psi back up as it's too close to the slightest hickup causing dinner time (and on the menu is your motor).
My old 383 setup i ran a 34f 36n at 5.5 psi and it ran for a long time but did ended up lifting the ring lands on 4 pistons and this is what i am tring not to do with this motor lol I just hope to get this thing right soon hell at this rate i'll have to freshen it up by the time i get it right lol
11-02-2008, 11:17 AM
#43
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AFR on motor is 12.5-12.8 thats where it seems to run the best, I dont plan on running less than 5 psi of fuel but a jet change just cant happen at the track witch is why i keep lowering the fuel pressure.
My old 383 setup i ran a 34f 36n at 5.5 psi and it ran for a long time but did ended up lifting the ring lands on 4 pistons and this is what i am tring not to do with this motor lol I just hope to get this thing right soon hell at this rate i'll have to freshen it up by the time i get it right lol
My old 383 setup i ran a 34f 36n at 5.5 psi and it ran for a long time but did ended up lifting the ring lands on 4 pistons and this is what i am tring not to do with this motor lol I just hope to get this thing right soon hell at this rate i'll have to freshen it up by the time i get it right lol
