Mis-information leads to Exciting night!
11-12-2004, 02:48 PM
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Mis-information leads to Exciting night!
Well here's the deal. I've been working on a dry nitrous kit for my truck. It's been installed for weeks, but I hadn't had the bottle filled or tried it until the other night. After looking around here and the Nitrous forum, and asking SEVERAL different sources, I was still confused on the Jet size/HP thing. I figured I would start small and work my way up. My truck has run a best of 14.5x on the motor, and feels like it has been running great lately. I asked SnakeEater for his input in a PM, since he seemed to be having great luck with his dry system. He told me the following, Originally Posted by Snake Eater
Quote:
As far as running the 93 tune with the 100 shot, GO FOR IT! I ran mine with the HPP3 93 tune with a 125 shot when i started, and got no knock. That was on the stock fuel system.
For a 100 dry shot on a v8 you should use the 76 jet. At least thats what it is for Compucar and NOS brands.
Hope this helped some,
Ron
...well I was still leary, so I started with a 47 jet, and on my G-tech it ran a FLAWLESS 13.77 @ 97.6. I was happy, but still felt like I was missing something, as he recomended a 76 jet. Someone else said that the 47 jet size was good for a 100hp in a DUAL solenoid shot, so it was starting to make some sense. I figured I would lean on it a bit more, so I took out the HPPIII programming (LUCKILY!), and put a 72 jet in, as it was the closest I had to the 76 he recomended. HOLY ****!!! The truck ran ITS *** OFF to the tune of 12.92 @ 107.6mph! 107.6! Well needless to say at the end of the run (after going thru at 107.6) the truck was sputtering a bit. I thought it had spit a head gasket out or maybe worse. The MAF had frozen up. I also went right home and removed the plugs, and they looked really LEAN, almost white. Well the truck is running ok today but I really thought it was the end of the 5.3. I know the G-tech is not 100% accurate, but its been real close for me at the track, and it felt like 107mph believe me! There is no way that a 76 jet is 100hp, NO WAY. I was both pissed and excited at the same time, and now that the truck is running fine, I'm not really pissed either. I remain confused, but come Sunday, at the track, I'm gonna stick to the 47 jet, I think that's closer to where I want to be...especially with a dry kit.
Quote:
As far as running the 93 tune with the 100 shot, GO FOR IT! I ran mine with the HPP3 93 tune with a 125 shot when i started, and got no knock. That was on the stock fuel system.
For a 100 dry shot on a v8 you should use the 76 jet. At least thats what it is for Compucar and NOS brands.
Hope this helped some,
Ron
...well I was still leary, so I started with a 47 jet, and on my G-tech it ran a FLAWLESS 13.77 @ 97.6. I was happy, but still felt like I was missing something, as he recomended a 76 jet. Someone else said that the 47 jet size was good for a 100hp in a DUAL solenoid shot, so it was starting to make some sense. I figured I would lean on it a bit more, so I took out the HPPIII programming (LUCKILY!), and put a 72 jet in, as it was the closest I had to the 76 he recomended. HOLY ****!!! The truck ran ITS *** OFF to the tune of 12.92 @ 107.6mph! 107.6! Well needless to say at the end of the run (after going thru at 107.6) the truck was sputtering a bit. I thought it had spit a head gasket out or maybe worse. The MAF had frozen up. I also went right home and removed the plugs, and they looked really LEAN, almost white. Well the truck is running ok today but I really thought it was the end of the 5.3. I know the G-tech is not 100% accurate, but its been real close for me at the track, and it felt like 107mph believe me! There is no way that a 76 jet is 100hp, NO WAY. I was both pissed and excited at the same time, and now that the truck is running fine, I'm not really pissed either. I remain confused, but come Sunday, at the track, I'm gonna stick to the 47 jet, I think that's closer to where I want to be...especially with a dry kit.
11-12-2004, 02:52 PM
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Glad to hear nuthing broke man.. Make sure you do a compression test too just to be safe. If you go lean enough, chipping off a ring land isn't out of the question. The trruck may even run fine and not be real noticable.
11-12-2004, 02:55 PM
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Colonel has a link in his sig with the get size/shot listings. The NOS dry shot for the F-bodys uses two foggers so the jetting size listed by them is for the two fogger set up. If you know your weight you can do the math of ET and weight to get your HP rating.
ya no wonder it was fast .76 isn't a 100hp jet. Make it a wet shot -trust me there is muuuuch more torque to be had. I think wet is the safe way to go also 
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11-12-2004, 08:03 PM
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I know, I wasn't blaming anyone. I can't imagine what size jet he is running if he thinks a 76 jet is 100. What could he possibley be running to think it is a 225 shot??? I'm gonna stick to the 41-49 size jets, and hopefully get a 13 second time slip on Sunday. Maybe after that, and for the 6.0L, I'll turn this into a wet system. I'm sure the injectors aren't enough for a 76 jet, and I'm sure the maf frozen was driving the computer crazy.