CDI on NOS?
Jan 26, 2006 | 11:13 PM
#11
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CDI on NOS?
Originally posted by: DSNUT
I have heard that to. My MSD has the option to set my advance curve and how much peak advance anywhere up to an additional 7 degrees (32 total). It also has a feature that allows you to retard the timing up above 7000 rpm I believe. With the programmable Vortex they ought to be able to program that top end retard to help curb detonation.
I also read that Hard1 was running 110 octane on all motor but Sandbomber was running 118 on NOS. Are they further advancing timing and solving the detonation problem with octane?
I wonder if the slower burning fuel is also less likely to lean out?
Ron
I have heard that to. My MSD has the option to set my advance curve and how much peak advance anywhere up to an additional 7 degrees (32 total). It also has a feature that allows you to retard the timing up above 7000 rpm I believe. With the programmable Vortex they ought to be able to program that top end retard to help curb detonation.
I also read that Hard1 was running 110 octane on all motor but Sandbomber was running 118 on NOS. Are they further advancing timing and solving the detonation problem with octane?
I wonder if the slower burning fuel is also less likely to lean out?
Ron
Jan 27, 2006 | 12:55 AM
#12
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CDI on NOS?
Yes, in the perfect world using the rev limiter would help make things safer. The Vortex is a nice option, especially if you are having problems. I had this exact same conversation with 222 a while back. I wasn't not sure how the CDI's for ds (atv's for that matter) were programmed. If I were having a problem, I would be all over a Vortex or MSD.
As far as wet vs. dry. Once it hits the intake (in the right ratios) it's all the same. Wet ONLY means that you are mixing raw fuel with Nitrous RIGHT before the head/chamber. Dry means that it's NO2 only being pushed though the carb and then mixes with gas before the intake. Is one safer than the other? It's safer in that the way the system works.... via the manifold that BD uses, it meters NO2 and pushes the exact (after it's adjusted correctly) amount of fuel through the carb for a good mix (vapor) being fed into the motor. The wet system has less "MAGIC" involved but has many more parts. Fuel pumps, solenoids, fittings, switches, relays etc. etc. all fail. Dry systems only have a button, 1 solenoid, and one fitting. If something were to plug up in the system, it's on the NO2 side - making it much more BOMB proof. You can have too much fuel and not break. Have to much JUICE.... KABLOOey!
DSNUT, the using higher octain is only helping resist the explosion. As you know, the higher the compression/pressure, the more heat that is generated. More heat means that pre-ignition becomes more and more possible. Think of a diesel.... In essence, there is not a "lean-out" per say, just not enough resistance to burn. Oct. ratings are measurments of a fuels are a fuel's resistance to burn. More pressure=more heat=easier ignitions. Could you effectively increase octain to overcome the ignitions after putting in more and more pressure? YES.... but then heads start popping off!
Real world.... our blown alky boats run extremely high CR's, and ALKY's octain is extremely high. IN other words, it's resistance to burn is very high. But when it does ignite - LOOK OUT. The explosion is much more intense. That's where the HP comes from .
Obviously I've made this overly simple.... Just giving some general instances and helping whomever understand the processes involved.
did I mix you guys up? [img]i/expressions/face-icon-small-confused.gif[/img]
As far as wet vs. dry. Once it hits the intake (in the right ratios) it's all the same. Wet ONLY means that you are mixing raw fuel with Nitrous RIGHT before the head/chamber. Dry means that it's NO2 only being pushed though the carb and then mixes with gas before the intake. Is one safer than the other? It's safer in that the way the system works.... via the manifold that BD uses, it meters NO2 and pushes the exact (after it's adjusted correctly) amount of fuel through the carb for a good mix (vapor) being fed into the motor. The wet system has less "MAGIC" involved but has many more parts. Fuel pumps, solenoids, fittings, switches, relays etc. etc. all fail. Dry systems only have a button, 1 solenoid, and one fitting. If something were to plug up in the system, it's on the NO2 side - making it much more BOMB proof. You can have too much fuel and not break. Have to much JUICE.... KABLOOey!
DSNUT, the using higher octain is only helping resist the explosion. As you know, the higher the compression/pressure, the more heat that is generated. More heat means that pre-ignition becomes more and more possible. Think of a diesel.... In essence, there is not a "lean-out" per say, just not enough resistance to burn. Oct. ratings are measurments of a fuels are a fuel's resistance to burn. More pressure=more heat=easier ignitions. Could you effectively increase octain to overcome the ignitions after putting in more and more pressure? YES.... but then heads start popping off!
Real world.... our blown alky boats run extremely high CR's, and ALKY's octain is extremely high. IN other words, it's resistance to burn is very high. But when it does ignite - LOOK OUT. The explosion is much more intense. That's where the HP comes from .
Obviously I've made this overly simple.... Just giving some general instances and helping whomever understand the processes involved.
did I mix you guys up? [img]i/expressions/face-icon-small-confused.gif[/img]
Jan 28, 2006 | 05:54 PM
#15
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CDI on NOS?
Originally posted by: sandbomber
YUP!! 119 for safety factor........it worked for 4 runs without the pump on LOL some nut had the switch upside down [img]i/expressions/face-icon-small-shocked.gif[/img]
Originally posted by: DSNUT
222
Jan 28, 2006 | 06:03 PM
#16
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CDI on NOS?
Originally posted by: 222
I'm still scratching my head trying to figure out how we even had a motor to race with after running 4 passes without the fuel pump! I've about decided the answer is "above" me....literally!
222
Originally posted by: sandbomber
YUP!! 119 for safety factor........it worked for 4 runs without the pump on LOL some nut had the switch upside down [img]i/expressions/face-icon-small-shocked.gif[/img]
Originally posted by: DSNUT
222
