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Author Topic: '08 Nitrous et and mph questions  (Read 6146 times)

Offline DWB

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'08 Nitrous et and mph questions
« on: August 14, 2009, 11:54:36 PM »
I added a 40 hp Spyder system and ran it tonight.  I've got a stock motor with Brock's system and PC3 usb.  Baseline runs were 9.23 @ 149.17 and 9.28@ 149.58.  I added 21% to Brock's map (+6% is always in there) and ended up going 8.98 @ 156.84 so a little over 7 mph gain and a little over .25 et reduction.  It went from 120.29 mph to 125.8 mph in the 1/8 or a solid 5.5 mph gain.  I figured it might be fat since I added 21% over Brock's map so I dropped it back to 15%.  I then went 8.948 @ 157.34 and 8.953 @ 157.15 with both runs being about .01 slower in the 60 foot so I figure the adjustment helped a little.

Question is - I think I'm about a tenth, maybe a tenth and a half and maybe 2 mph off what I should run in the 1/4 but the 1/8 mph seems good.  Do you agree?  I'm going to check my clutch stack height this week and I'd like to get to a tuner to really see what's going on but that isn't available to me right now. 

Offline Predator

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Re: '08 Nitrous et and mph questions
« Reply #1 on: August 15, 2009, 12:47:17 AM »
I had a 30 shot on my 08 with streetmeg brocks map lowered strapped no filter added 4 bars on the pc and it was still lean 14.1 on the dyno you need 2 pc III's or bazzaz to get enough fuel to spray any more than a20 shot on the 08 up bikes from what I ve seen that was on 93 pump gas also if your running mr9 or u42 youll be really lean on  the spray.
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Offline DWB

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Re: '08 Nitrous et and mph questions
« Reply #2 on: August 15, 2009, 08:04:00 AM »
That's with 92.  I leaned it out and it seems to have gone faster.  What values did you have in the 100% column?

Offline Bently1

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Re: '08 Nitrous et and mph questions
« Reply #3 on: August 15, 2009, 10:22:47 PM »
Good job on that 8.94 it was cool to watch. looked nice and smooth. you will see 8.75s before the end of the year.
2008 Busa

Offline Zmydust

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Re: '08 Nitrous et and mph questions
« Reply #4 on: September 09, 2009, 11:18:12 PM »
How long is the bike, mine normally runs around 130-131 in the eighth
8.74 @166  9 PSI

Offline smithabusa

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Re: '08 Nitrous et and mph questions
« Reply #5 on: September 10, 2009, 05:43:43 AM »
+21% via the lower injectors doesn't get you very much fuel, i'd put that thing on a dyno or put a logger on it, bet you are running it LEAN
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Offline sg1320

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Re: '08 Nitrous et and mph questions
« Reply #6 on: November 15, 2009, 07:26:32 PM »
Nice gains :thumb:  When are you getting on the bottle, after you click into second?  Do you feel the hit pretty good?

Offline SPYDER97GST

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Re: '08 Nitrous et and mph questions
« Reply #7 on: November 16, 2009, 12:03:25 AM »
must be nice. i have gone 9.0 on a 60 shot stock motor. you light guys have it made.

Offline Blue08Busa

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Re: '08 Nitrous et and mph questions
« Reply #8 on: March 24, 2010, 01:47:02 AM »
+21% via the lower injectors doesn't get you very much fuel, i'd put that thing on a dyno or put a logger on it, bet you are running it LEAN

Hey, I currently have a pc V and a zex dry kit installed on my bike.  I have yet to run the nitrous.  The bike has only been to the track once so far and It ran 9.57 @149 with a soft launch and a 1.7 60 ft.  I have been considering your setup to tune the stock ecm.  I was curious though since I know you have plenty of experience with tuning these bikes.  How much of the fuel are the lower injectors spraying at WOT?  If you upped the fuel flow say 20%, does that only up the fuel 20% over what the lowers are spraying, or 20% of total assuming the lowers can handle it?  I am guessing that its only 20% of what the lowers are spraying.  I also understand that the stock fuel pump is limited and can only handle supposedly up to around 215hp.  I currently have the 30 hp jet installed.  I figure that should keep me within that range.

Also, can someone tell me if the head has to be removed to change the valve springs?

Thanks
Ben