matt sterbator
Pro
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posted August 06, 2005 01:25 PM
Nitrous map suggestions
So I got the nitrous (dry) working good after a few bugs last time out. I put the smallest jet (.026) in it for testing and changed the map a bit just to be safe. The N/A map has alot of timing advance in it. It's +5° from 2k-about 6500rpm, and +8° from 6500-12000rpm. So I took all the timing out and added 15% more fuel from 7k-12k rpm.
The N/A map is pretty good, makes great power, a/f is good. If ya don't know the setup: 1287cc, Carpenter head, stock cams. 10,000 miles on it, roughly 200 passes, always on 93 octane pump gas, plugs are NGK CR9s (stock), Muzzy fuel pump.
Obviously, it runs like ass off the bottle with the modified map in it, and it runs marginally better on the bottle than it did with the good N/A map in it... atleast with that little jet in it.
Short of mapping it with a wideband, anyone have any suggestions on timing and fuel for this thing ? Would it be safe to back the timing a few degrees off the +8° it had in it, or should I really leave it at the 0 setting ?
I've played with this stuff before, but it was wet kits on 5.0 Mustangs that barely made any more power N/A than my bike does, lol.
   
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your car is slow
Needs a job
Fuck Nitrous...Got Boost?
Posts: 4089
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posted August 06, 2005 01:30 PM
leave the map...up the jet 
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Do not taunt happy fun ball!
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zrxdean
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posted August 06, 2005 04:50 PM
Up to 40hp, you really don't need to pull any timing, or worry much about fuel. So either put the timing back, or put the BIG pills in it. 
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Nukedog
Expert Class
Posts: 449
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posted August 06, 2005 08:27 PM
Wish we could have seen you all at Gville tonight... Track was good and the air was too. Plus there was a pretty strong running Busa putting down lots of 9.33's and a 9,28..
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02 Busa...Turbo...
09 YZF-R6S...
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matt sterbator
Pro
Hiding in the bushes
Posts: 1367
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posted August 06, 2005 10:40 PM
Dean, it just seemed like it has alot of advance over stock with the N/A map so I figured it'd be safer. I think I'll put most of the timing back and take out a lil fuel, try it, then check the plugs.
Nuke, had to work. Tried Gainesville AND Jax this past week only to get rained out. Who's bike was running ? You still waitin on that shim kit ?
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Nukedog
Expert Class
Posts: 449
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posted August 07, 2005 04:48 AM
I heard about the other two times you guys got rained out - that sucks!.
Not my bike - but mine should be there next weekend.
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02 Busa...Turbo...
09 YZF-R6S...
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zrxdean
Needs a job
Posts: 2225
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posted August 07, 2005 06:09 AM
I agree, better safe than sorry. Does the +8 number really mean total timing + 8 deg, or does it reflect the advance curve, bringing the motor to total timing at high RPM?
I pick up my new head from Ryan tonite - I am psyched ot see what difference it makes. I'm gonna take some pics - Kevin gets wood when he looks at it too long
Dean
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zrxdean
Needs a job
Posts: 2225
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posted August 07, 2005 06:12 AM
Some folks say 2 deg of retard for every 50hp of spray BTW. What is total timing on your motor?
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RAC4IT
Needs a job
Bergie
Posts: 3009
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posted August 07, 2005 11:54 AM
F the pill, take the pill OUT, thats about 100hp dry.
Dont Be Scared
Might wanna pull 4 degrees and add a little fuel :-)
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matt sterbator
Pro
Hiding in the bushes
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posted August 07, 2005 12:34 PM
Dean, the +8° is the setting on the power commander, so that's +8° over stock timing. What stock timing is, I don't know, I think there was even a question posted about it recently (Lorcan I think).
The -2° timing for every 50hp is pretty standard. What I'm asking is should I be pulling the timing from the +8° or from stock. Guess I'm just a little leary of spraying on top of that much advance over stock, ever though the motor really likes the N/A timing.
Thanks Bergie, lol. Now pull the timing from stock or from the +8° ? and how much fuel ?
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RAC4IT
Needs a job
Bergie
Posts: 3009
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posted August 07, 2005 04:42 PM
from stock
if you take the jet out, +30s from 7500 up or wherever you kick it on
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osti33
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posted August 07, 2005 07:34 PM
Hmm, learn something new everyday. I didn't think you could add or subtract more than 5 degrees of timing with the PC3R. I'll have to mess around with mine some and see how she preforms...
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matt sterbator
Pro
Hiding in the bushes
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posted August 07, 2005 09:38 PM
Heh, I was just as suprised to see those values in the map when I first got a look at it.
The fuel isn't the issue, it's all that timing. Should I be backing the timing off the current map, or backing it off the stock "0" setting ?
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RAC4IT
Needs a job
Bergie
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posted August 08, 2005 03:19 AM
-4 from 0.
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matt sterbator
Pro
Hiding in the bushes
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posted August 08, 2005 09:05 AM
Yeah, with the Bergie shot on it... what about at more sane levels ? :P
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osti33
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Posts: 2973
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posted August 08, 2005 10:03 AM
Sterbator, Did you get that map you have from Carpenter? The one with the + 8 on the timing.
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matt sterbator
Pro
Hiding in the bushes
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posted August 08, 2005 11:08 AM
No, someone down south mapped it. Only thing from Carpenter is the head.
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osti33
Needs a job
Posts: 2973
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posted August 08, 2005 12:20 PM
Cool. Thanks.
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RAC4IT
Needs a job
Bergie
Posts: 3009
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posted August 08, 2005 05:39 PM
FYI- I pull -2 from zero @ Maxton, works for 200+ mph, bike runs better under heavy load on the top end with LESS timing, I don't care what the dyno says. I've picked up a solid 3 MPH pulling -2 naturally aspirated. Safer too.
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