mrsantafe
Zone Head
Posts: 521
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posted March 10, 2008 07:48 PM
home made direct port dry nitrous questions????
Stats on my bike as follows:
carpenter 1290 kit with all the goodies, ceramic tranny bearings, stacks, billet basket, 6 heavy duty brock springs(just added), pc, etc. Makes between upper 180's to low 200 's depending on dyno.
14.1 compression and 91 octane fuel (non oxygenated)
Added dry kit with a 36 or 38 jet and power jumped 53 hp with af ratio of about 12.3 to12.5 af ratio stock timing(mile high) 3 gallons of vp 110 and two gallons of 91 octane.
rider weight 230 lb's in gear, 5300 elevation of track(air density 8300 ft) foot shifted, street tire, slipping clutch. one half way clean pass minus crappy 60 ft 1.71 netted 9.78@155.13 mph. 6 degrees of timing pulled out for possible safety issues.
I bought a nos spray bar over on the hayabusa board mounted the spray bar on the outside behind the air filters and ran copper tubing through the (ash trays) and they set up directly over the velocity stacks.
I also got the injectors cleaned and flowed (approximately 330 cfm).
This weekend i'm heading to the dyno and upping the nos jet. I'm guessing the fuel system will run out of fuel at approximately 270-275 hp @100% duty cycle on the injectors.
I know 14.1 compression is alot especially with a big dry shot. However,i live at a mile high location which effectively reduces my overall compression by a full point(in theory).
Dry kit includes: window switch set to come on at 6000 rpm/ shut off at 11k, microswitch, (only comes on at full throttle) bottle pressure of around 950-1100
I'm thinking of running upwards of an 80-90 hp dry shot depending on duty cycle. My questions are:
1. how much timing should i pull? (i have muzzy manual ign adv.-retard)
2. What fuel should i be running?
3. Whats the maximum numbers that can be added to the powercommander cells( i think its 45)?
4. Should i add fuel in the 80% column as well?
5. what should i shoot for as far as af ratios (11.5-12.0? or........)
My goal is to see a 160 mph trap one time without blowing it apart, before i retire my bike to street duty and build a turbo zx14.
any thoughts or comments appreciated!
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9.78@155.13 mph 1.71 60 ft @ a near mile high dragstrip
2006 ZX14 gone
2006 ZX10r (Wifes street bike)
2004 zx10r (her race bike)
2002 ZX12 (still kicking a--)
2007 gsxr 1k (race bike)
  
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krexken
Zone Head
Posts: 732
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posted March 11, 2008 07:49 PM
I'd be really paying attention to cylinder to cylinder temp differences. The spraybar kinda worries me with only one jet feeding all cylinders. Hopefully the individual nozzles will are small enough to provide adequate pressure and flow to all of them. Another member here has something similar but uses individual jets at each nozzle with a common header feeding them. Another friend just bought some oxygenated/high octane fuel intended for nitrous. Sounds like the hot ticket. Use high octane, for sure. The rest, I'm not so sure. Can't hurt to add fuel at the 80% column since it's unlikely you'll be getting at that position unless your on your way to WOT. I have a friend/customer that claims his 2 stage dry system adds around 100hp to his 1270. I've patched it up a few times and I know he's pushing the limits, sparkplug, head gasket, head and piston wise anyways. LOL
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