kaw12
Expert Class
Posts: 172
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posted August 02, 2007 02:39 PM
zx12r dyno??
getting zx12r 2001 dyno'd saturday A2 model.. full akra ti, bmc street, kleen air off, pc3usb.. lowered 2" front and back.. Any recommendations where i need to be looking on the correct a/f ratio??? looks like some are saying 12.8 to 1,, does that sound right for full performance??
  
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Wolf Racing
Expert Class
Posts: 138
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posted August 03, 2007 02:54 AM
12.8 to 13.1 is where we usually put a bike like that. Make sure the bike is at normal run temp when tuning.
Let us know how you go!!
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entropy
Moderator
Posts: 8671
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posted August 03, 2007 05:16 AM
quote:
12.8 to 13.1 is where we usually put a bike like that. Make sure the bike is at normal run temp when tuning.
Let us know how you go!!
yep, 13.1 might give a lil better dyno hp, but the 1/4 mi likes 12.8-ish better.
And wolf ain't kidding about getting the motor completely up to operating temp before making pulls. If your dyno guy doesn't have an infrared temp gun, he should get one. Just getting the temp gauge to 9pm isn't sufficient. Let the motor get fully heat soaked.
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psycho1122
Pro
Posts: 1608
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posted August 03, 2007 08:30 AM
Also, don't allow tuner to let the engine get TOO warm.
We have seen the ECU "dump" fuel when exceeding 230+ deg. Looks like there is a built in protection algorithm.
The tuner should do the high rpm tuning first.
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supra5677
Pro
Posts: 1279
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posted August 03, 2007 09:14 AM
read Brocks diary for the zx14 good stuff on a/f ratio..
what makes more on the dyno doesn't necessarily get you down the road faster.. Error on the side of 12.8 to 1
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kaw12
Expert Class
Posts: 172
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posted August 05, 2007 06:19 AM
well, i got to the dyno. Put the bike on the rack hooked it all up, and ""bam""" the wire from the dyno computer to the coil wire (the one that picks up rpm) was non-functional. Has to order a new one.. :+( but i will post my results when i get them!!! thanks for all your help guys..
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VincentHill
Needs a life
Posts: 6520
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posted August 05, 2007 02:23 PM
Man 0 Man no break there! Did you speak to him about a full chart print out in 500 RPM increments!
I also agree about the A/F 13.1 to 13.3 for Max power but for max torque 12.6 to 12.8
Only a ZRX likes 13.3 to 13.6 A/F for Power
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entropy
Moderator
Posts: 8671
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posted August 05, 2007 02:48 PM
VH,
what you talking about power & Tq???
pww = tq thru that 5250 conversion = same thing.
IME, lean(13.1-.2) = higher dyno pwr AND tq
a bit richer (12.6-12.8) = more mph at 1/4 mi.
just my experience 
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VincentHill
Needs a life
Posts: 6520
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posted August 05, 2007 03:28 PM
When I am doing some of the runs on the Dyno, I have seen where when I ran it a little richer the HP went down a little but the Torque went up a little. Remember these are PEAK Numbers and maybe where the PEAK Torque was higher the HP "Right There" may have been higher also.
Plus the readings are just behind the real world numbers and and sometimes richer readings on the dyno's That are under smaller loads CHANGE When a Higher load is applied and the A/F will go Leaner!
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supra5677
Pro
Posts: 1279
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posted August 06, 2007 07:48 PM
entropy is correct I believe.. richer air/fuel compensates for ram air better..
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kaw12
Expert Class
Posts: 172
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posted August 07, 2007 04:35 PM
quote:
Man 0 Man no break there! Did you speak to him about a full chart print out in 500 RPM increments!
I also agree about the A/F 13.1 to 13.3 for Max power but for max torque 12.6 to 12.8
Only a ZRX likes 13.3 to 13.6 A/F for Power
im glad you brought that up, he should actually maximize the map to 250 increments to tune.....not 500 correct?? looks like im going to get him to tune the a/f ratio to 12.8, if i can im going to see if he'll do some 3k to 6k 100% throttle and richen up the top end a bit.
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