I'm running nos to get the 88turbo going. I'm wondering if I use the msbc to limit boost to say 8lbs at launch and i'm shutting the nos off at about the same time will it hold that boost level or will it fall off when the spray shutts off. Anybody running nos to spool with a boost controller too?
NOS to spool & msbc cont.
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jasjamz
THS Racer
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- Sep 30, 2004
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Id think the controller would keep it at 8 psi. The Nitrous should have the engine RPM up high enough to maintain the 8 psi. I would set it to go off before the Launch Boost limit. 2psi before. I have use it on a hobbs switch and a manual boost controller. 15 psi...
Engine rpm may level slightly when the nos turns off. When I say slightly, mine levels off for less than .2 seconds. MAP should continue on a steady climb. I run a boost controller, but have never tried to control the boost rise with the controller while the nitrous was still being used to build boost. If you want the boost to level out at a certain point, you will have to pick a point well before your target to shut the nitrous off. The MAP is going to be on a steep climb and the controller may have a hard time bringing it back down for you without some help in the form of lead time with shutting the nitrous down sooner.
My experience, once the nitrous hits, and even after the nitrous shuts down, rpm and map have no problem maintaining and climbing.
I shut the nos down at 16 psi (200 kPa). That's always been a good target for me.
If you're just trying to bump the map and stall speed up for staging and before launch, you might want to put the nos on a button. Or, you can include a timer and play around with different amounts of nos on time until you get the boost where you want it for the launch. There's lots of fun ways to control the nos.
My experience, once the nitrous hits, and even after the nitrous shuts down, rpm and map have no problem maintaining and climbing.
I shut the nos down at 16 psi (200 kPa). That's always been a good target for me.
If you're just trying to bump the map and stall speed up for staging and before launch, you might want to put the nos on a button. Or, you can include a timer and play around with different amounts of nos on time until you get the boost where you want it for the launch. There's lots of fun ways to control the nos.
I really had no problem getting it to spool ounce I got the nos & xfi wiring sorted out. I was shutting it of at 12psi and that was to high for traction I was just blowing the tires off, I leaving at about 8psi. I then set it back to about 8psi and I got the car to hook, but only leaving at about 4psi. Both runs top psi was about 25psi. I think maybe leaving with about 10psi with out the 100hp shot on top and maybe controlling the boost ramp i could get the car to be cosistent. I could easy enough play with the shut off points with the xfi. Just trying to get up on boost without having to burn up the trans and be consistent. I'm just not sure how its going to react ounce the nos shuts down. I was also thinking of using different psi setting at like the 60ft, 330ft, 660ft, if needed when the weight transfer has changed. It's not all that fun getting squirlly at higher speeds.
Well, you have a few options here. If you're obtaining 8 psi within .5 sec with the nos, I would think heavily on going with a larger turbine housing or turbine wheel/housing combination. That would help make boost control easier, and would help your top end performance.
2 step rev control would only be necessary if 1) you're looking for very consistent launches for bracket racing, 2) your t/c stall speed, when on the nitrous, is too high, 3) you're unable to control the boost level during staging to control launch rpm that way.
For example, my nitrous hit size and t/c stall combination is such that, when on the nitrous, my t/c does the rev control for me.
You can use the nos hit size to fine tune the launch attitude of the car. The nitrous hit size, hot side (turbine wheel/housing) size, and the T/C stall (on the nitrous), tuned together can be a very good tool for coming up with the launch attitude you're seeking, making a 2 step rev control completely unnecessary.
Let me put it another way. If the hot side, t/c stall, and the nos hit size are poorly matched, making boost control at the launch difficult, then a 2 step rev control would most likely be necessary as a band aid method of controlling launch rpm.
If you do use a 2-step, only use timing retard if the nos is going to still be active during the 2-step. Do not drop ignition or fueling to cylinders where the nos is still on. Otherwise, just make sure there is no chance that the nitrous can come on during the 2-step if you plan to drop ignition and/or fueling.
2 step rev control would only be necessary if 1) you're looking for very consistent launches for bracket racing, 2) your t/c stall speed, when on the nitrous, is too high, 3) you're unable to control the boost level during staging to control launch rpm that way.
For example, my nitrous hit size and t/c stall combination is such that, when on the nitrous, my t/c does the rev control for me.
You can use the nos hit size to fine tune the launch attitude of the car. The nitrous hit size, hot side (turbine wheel/housing) size, and the T/C stall (on the nitrous), tuned together can be a very good tool for coming up with the launch attitude you're seeking, making a 2 step rev control completely unnecessary.
Let me put it another way. If the hot side, t/c stall, and the nos hit size are poorly matched, making boost control at the launch difficult, then a 2 step rev control would most likely be necessary as a band aid method of controlling launch rpm.
If you do use a 2-step, only use timing retard if the nos is going to still be active during the 2-step. Do not drop ignition or fueling to cylinders where the nos is still on. Otherwise, just make sure there is no chance that the nitrous can come on during the 2-step if you plan to drop ignition and/or fueling.
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