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Old 02-17-2006, 09:35 AM   #61
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Quote:
Originally Posted by dgullickson
This would be the better motor.. Look at the 20 amp Watts. very nice - good job..

Marcos J.

Confused on these readings from your post:

rpm torq watt ef amps
33363 1.3 32 30 15.2
28508 4.0 85 68 17.9
27013 3.9 79 51 21.8
23500 6.0 79 51 24.9
20897 8.2 126 64 27.9
19602 9.1 132 62 30.1


At the 21.8Amp mark and the 24.9 the Watts are the same while the Torque value changed? Typo I presume?
it was a typo my bad i just looked at the print out and it is

23500 rpm 6.2 108 62 24.9 amps
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Old 02-17-2006, 09:36 AM   #62
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Quote:
Originally Posted by teamgp
It probably stayed the same because of the huge increase in rpm as it spun up.
Have had this happen before and its a glitch when you are running the Dyno - usually a slight power loss. Redyno I bet it comes out different.

Do you run a Golden Standard at all on your Dyno? if not you should have a motor you know is good Dyno it and store it so if there is ever a question of Dyno Results you can use that to make sure its not the Dyno. I have 5.

Dont take this as a slam as some people misinterpret things on the net, I am just trying to point something out and help a fellow racer/tuner out.
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Old 02-17-2006, 09:42 AM   #63
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here is the print out
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Old 02-17-2006, 09:57 AM   #64
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Quote:
Originally Posted by dgullickson
Have had this happen before and its a glitch when you are running the Dyno - usually a slight power loss. Redyno I bet it comes out different.

Do you run a Golden Standard at all on your Dyno? if not you should have a motor you know is good Dyno it and store it so if there is ever a question of Dyno Results you can use that to make sure its not the Dyno. I have 5.

Dont take this as a slam as some people misinterpret things on the net, I am just trying to point something out and help a fellow racer/tuner out.
Yep. Got the baseline stored away safely.
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Old 02-17-2006, 10:01 AM   #65
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Quote:
Originally Posted by dgullickson
Have had this happen before and its a glitch when you are running the Dyno - usually a slight power loss. Redyno I bet it comes out different.

Do you run a Golden Standard at all on your Dyno? if not you should have a motor you know is good Dyno it and store it so if there is ever a question of Dyno Results you can use that to make sure its not the Dyno. I have 5.

Dont take this as a slam as some people misinterpret things on the net, I am just trying to point something out and help a fellow racer/tuner out.
I make 2 to 3 passes on the dyno with the same motor every time ,some times 4 just to make sure and the #'s are usually only off by +1-1.I use the same setting with all my stocks motors

Last edited by Marcos.J; 02-17-2006 at 02:19 PM.
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Old 02-17-2006, 02:31 PM   #66
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i was up all last night tuning these things best i seen so far on my dyno

rpms torq watts ef amps 7.00 v
27850 3.5 73 57 17.9
25714 4.7 90 64 19.9
23715 5.9 103 66 22.0
21895 7.3 119 68 25.0
20218 8.6 129 65 28.1
18924 9.5 133 63 30.1

using green and red with 4499s i think work the best......so far
hope its good on the track ill find out this weekend
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Old 02-17-2006, 02:34 PM   #67
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Quote:
Originally Posted by motorhead
using green and red with 4499s i think work the best......so far
Did you try 767 brushes yet?
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Old 02-17-2006, 02:38 PM   #68
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Quote:
Originally Posted by James35
Did you try 767 brushes yet?
no im still waiting for the order to come in now i tryed 3002 by integy
and they are very close to 767s and rpm s were only 25876 but the touq
was insane . torq 10.0 watts 131 ef 62 at 30 amps
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Old 02-17-2006, 03:10 PM   #69
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How are you guys gearing the co27 compared to the monster? I geared the same as recommended by the sheet that came with the motor and it felt really flat on the top end. I used 767's with red green brushes. I geared all over the place and could not get as of fast lap times than with a monster. The dyno numbers are great but not being able to gear it makes it a useless motor to me. Im gonna test more tonight but its a little frustrating.
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Old 02-17-2006, 09:01 PM   #70
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Jim -- I'd say your springs are too soft...

You used their gearing recommendations, but went way softer than their recommendations on the springs. They recommend Purple and Red. By using softer springs, when you geared up, the brushes arc too much due to insufficient spring tension.

If you want to use their recommended gearing, dont ignore their recommended setup.

Note that most on this thread are finding the motor "likes" stiffer springs like Purple/Red... Some are seeing good numbers on the dyno with softer springs, but the best dyno is the track, where vibration, etc. increase the brush bounce/arc, so soft springs on the dyno can be misleading. Also -- if you are using their rollout recommendations, I assume you are running in a sedan - some may be tuning for 4-cell 12th scale, etc. where the softer springs work.

Just a guess, but one based on my personal experience...
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Old 02-17-2006, 09:11 PM   #71
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OH -- I know it's only an Oval Sanctioning body, but ARCOR has approved the Co27 for competition in sanctioned events effective March 18...
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Old 02-18-2006, 12:38 PM   #72
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I am pretty happy with the performance of the motor so far. I have not tried it with the 767 brushes yet. I am planning on trying them tuesday night. It ran pretty good with the stock setup on it though. This is the Pro version with the red and purple springs on it of course.
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Old 02-18-2006, 12:45 PM   #73
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does any have some specs on the blueprinted version from team brood
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Old 02-18-2006, 01:27 PM   #74
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Quote:
Originally Posted by Rasmus TbEvo IV
does any have some specs on the blueprinted version from team brood
Not yet, but I have one on the way(I'm told it may arrive in the next 6 days or so), so once it does & I've had a chance to try it on my dyno & in the car, I will report on it.....
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Old 02-20-2006, 07:54 AM   #75
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Quote:
Originally Posted by JimMcClure
How are you guys gearing the co27 compared to the monster? I geared the same as recommended by the sheet that came with the motor and it felt really flat on the top end. I used 767's with red green brushes. I geared all over the place and could not get as of fast lap times than with a monster. The dyno numbers are great but not being able to gear it makes it a useless motor to me. Im gonna test more tonight but its a little frustrating.
I'd have to agree with tfrahm on the harder springs. I ran the CO27 this weekend with purple/red springs and ended up bending the springs slightly in order to cut down on arcing once I geared it up to P2K2 territory for the best results. The final spring tensions dyno'd at +258 and -248 and the rollout ended up around 29.8mm. Our current track config consists of four straights (one with a kink), four tight corners and a large sweeper. The "drag strip" layout makes the motors run deceptively cool even though we are gearing up higher than normal on all types of motors for the straights. However, the motors pull a lot of amps coming out of the tight corners and with the higher gearing arcing can be a problem with normal spring tensions. For tighter tracks the rollout for CO27's might be better around 28.5mm.
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