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Old 05-03-2006, 10:34 AM   #196
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Originally Posted by SA_Racer
What peak numbers are you guys getting for this motor on the Robi Dyno? Just want to know if im hitting the ballpark or if im doing something wrong and need to keep trying.

Also give us your first and third run numbers, I have found the first run to be unusualy high on the Wats side (On one motor I got 135w) but they usualy level out at 125wats and 31500 RPM, I can get the RPM's up but then I lose power.

Thanks
we spun up a couple on the robi dyno last weekend while racing oval.

Peak numbers 126-128 watts 18-26 average watts - shoot for 100+ watts

Torque on main screen- 90
I dont use the RPM on the main screen I use the 30T step rpm in the data table - we were seeing about 24000 rpm out of them, which is about 1000 less rpm than a monster motor
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Old 05-04-2006, 12:49 AM   #197
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Quote:
Originally Posted by erock1331
we spun up a couple on the robi dyno last weekend while racing oval.

Peak numbers 126-128 watts 18-26 average watts - shoot for 100+ watts

Torque on main screen- 90
I dont use the RPM on the main screen I use the 30T step rpm in the data table - we were seeing about 24000 rpm out of them, which is about 1000 less rpm than a monster motor
Thanks Erock

That sounds like what I have been seeing. I check my av amp range from 21a-31a for Stock TC, in that range I get about 112w+ RPM at 30T is round 24000 also. my torque numbers arenít as high as yours, I get up to about 85 on my best motor.

Iíve really been battling to find the right gearing for these motors at my local track. my epics just seem to rip much better. im thinking that maybe larger tracks donít like these motors.

our laps are around 18 seconds, size is 60m by 40m

on a monster that revs 25500 at 30T I rollout at 27.0, with the CO27 with 24000 at 30T I started rolling out at 28.5, went higher and lower but nothing seemed to work, the best lap times I got was at 29.4 but was still .5 per lap slower than with an epic.

Ill appreciate if anyone here has some advice for me to get these babies to work. Last weekend 3 of us tried these motors and none of us had any luck
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Old 05-04-2006, 05:55 AM   #198
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Thanks for the info guys! Unfortunately I only got a motor checker. But perhaps someone at the track will run my motors on their dyno.

On the motor checker I get around 34000 rpm, 9A at 7V. But thats not comparing apples with apples is it!

SA_Racer....where abouts in SA you race?
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Old 05-04-2006, 07:29 AM   #199
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Quote:
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SA_Racer....where abouts in SA you race?

Im in Johannesburg
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Old 05-04-2006, 08:17 AM   #200
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SA
Since I run oval so I cant help ya with the TC gearing.

All I can say is for oval on a small track I add 2 teeth to the co27 compared to a Monster. On a big oval track I have seen guys go up 3 to 4 teeth.
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Old 05-04-2006, 01:06 PM   #201
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Quote:
Originally Posted by psychosilence
Could anyone give an indication of what numbers an above average CO27 would give? Would like to know if my motors are delivering what they should.

Thanks
here are one of the #'s from the last bach of CO 27's that I just finished

Constant Volt 7.00

RPM Torque Watt EF Amps
25418 3.9 68 59 15.0
22982 4.6 78 62 17.9
20655 6.5 106 65 20.1
19689 7.7 119 65 24.9
18355 8.9 129 61 27.9
17619 9.7 135 56 30.1

these are with the full face F-brushes and Red + Green - springs
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Old 05-04-2006, 05:02 PM   #202
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Can't really compare dyno to dyno - but here are the numbers from my GHP Motorsports CO27.

Goop hooked me up with one crazy motor!

Constant Volt 7.00

RPM Torq Watt EF AMPS
23703 5.7 101 68 21.0
21664 7.3 118 71 23.6
20258 8.4 126 70 25.7
18970 9.4 132 68 27.5
18130 10.2 136 65 29.4
16783 11.4 142 62 32.4

Really had to gear down on this motor. I can finally see how guys were going down to 6.5 FDR's with these motors. I wound up at a 6.6 before I was real happy with it... but i think I may have more room yet. I'll be playing with it in the future. Has a lot less RPM... but a ton more power across the board.
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Old 05-05-2006, 08:14 AM   #203
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Quote:
Originally Posted by XMSRacing
Can't really compare dyno to dyno - but here are the numbers from my GHP Motorsports CO27.

Goop hooked me up with one crazy motor!

Constant Volt 7.00

RPM Torq Watt EF AMPS
23703 5.7 101 68 21.0
21664 7.3 118 71 23.6
20258 8.4 126 70 25.7
18970 9.4 132 68 27.5
18130 10.2 136 65 29.4
16783 11.4 142 62 32.4

Really had to gear down on this motor. I can finally see how guys were going down to 6.5 FDR's with these motors. I wound up at a 6.6 before I was real happy with it... but i think I may have more room yet. I'll be playing with it in the future. Has a lot less RPM... but a ton more power across the board.
It looks like they used torque steps for those #'s Its very odd for a stock to put out 142 watts
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Old 05-05-2006, 08:24 AM   #204
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here is mine done in torque steps

constant volt 7.0
RPM Torque Watt EF Amps
22767 5.5 104 61 21.6
20541 7.5 116 62 26.0
19284 8.6 129 61 28.2
18179 9.6 137 60 30.7
17118 10.5 140 57 33.4
15547 11.5 144 53 35.6

its how you set up the torque steps , you can change the torque values and it will show a higher #,I usually use the amps steps for stock and the torque steps for 19t
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Old 05-05-2006, 08:28 AM   #205
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I know very little about these dynos - so I'll just nod my head and agree to that. lol

What I can tell you is I had to gear WAYYYYY down from my other CO27's so though this number sheet was confusing at first - it really made sense as I got the gearing right and the motor came to life. I had my other motors at 7.5-7.3 - this one is at 6.6 currently and I actually think I can go down more. Not much... but a little more... I'm thinking in the 6.4 to 6.5

And I can tell you this thing had a ton of nuts out of the corners.

BTW - I wasn't trying to bash your motor/s. I was just outrageously happy with this one - and thought I'd post up the numbers. I've seen the entire time you've been building awesome stuff.
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Old 05-05-2006, 08:28 AM   #206
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I ran the co27 on 4 cell oval, short track, very tight corners. I had to gear it up and ran same gear ratio as monstser stock. I believe in 4 cell there is not enought voltage and amperage to take advantage of the mid range. it work better with a lower overall gear ration. I was at the bottom of the a main. I think the monster is the better 4 cell motor. IMHO.
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Old 05-05-2006, 08:31 AM   #207
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Quote:
Originally Posted by XMSRacing
I know very little about these dynos - so I'll just nod my head and agree to that. lol

What I can tell you is I had to gear WAYYYYY down from my other CO27's so though this number sheet was confusing at first - it really made sense as I got the gearing right and the motor came to life. I had my other motors at 7.5-7.3 - this one is at 6.6 currently and I actually think I can go down more. Not much... but a little more... I'm thinking in the 6.4 to 6.5

And I can tell you this thing had a ton of nuts out of the corners.

BTW - I wasn't trying to bash your motor/s. I was just outrageously happy with this one - and thought I'd post up the numbers. I've seen the entire time you've been building awesome stuff.
I know you werent its just a different step from the dyno , anyways I gear my CO27 at a 6.00 FDR and 2 weeks ago I gear it to a 5.87 fdr and it was fast!!! not that hot either after 5 minutes, anyways your motor looks to be very fast!!!



thanks for the props!!
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Old 05-05-2006, 08:31 AM   #208
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The other thing that was odd to me... as I went up on the gearing... the motor came off the track cooler. Didn't really get that... other then once I did that I wasn't havnig to touch the gas much in the infield... just little blips here and there and it was a land missle.
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Old 05-05-2006, 08:33 AM   #209
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Quote:
Originally Posted by XMSRacing
The other thing that was odd to me... as I went up on the gearing... the motor came off the track cooler. Didn't really get that... other then once I did that I wasn't havnig to touch the gas much in the infield... just little blips here and there and it was a land missle.
I have a trick for you if you want a little more RPM!! Il pm it to you if you want
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Old 05-05-2006, 08:35 AM   #210
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I'm a newb - I listen to everything! (as long as it's coming from a good source, not some random person on here) PM away!
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