Post by SKR on Dec 23, 2009 10:57:27 GMT -7
With the release of BSRT's Ceramic bonded motor magnets for the G3/G-Plus cars...... there has been questions coming up as to whether they would be legal in ISRA's MM/PS class.
I was able to do some testing this week and would like to share the results with you.
My base test car was my Larry Morgan Mustang that TQ'd this past week with a .3690 E/T and won the final with the same E/T. Once I powered up the track for some testing I made two more runs before switching motor magnets.
Old Ceramic Magnets
Run #1 .3727 @ 40.83 mph
Run #2 .3745 @ 40.58 mph
After tearing down the car and checking the magnet strength on my cheap pocket scale I found that the magnets read
South magnet - 20.0
North magnet -19.1
I found this odd because on Friday before the race I re-zapped them and they were both reading in the -23. range. With only about 6 runs on the car they magnets have already weaken.
Bonded Ceramic Magnets
Before I put these into my chassis I tested them on the scale.
South -23.4
North -23.2
As far as E/T'S
Run #1 .3745 @ 39.64 mph
Run #2 .3706 @ 39.41 mph. Car was cooled between runs.
Magnets were retested for strength after testing. No difference at all.
South -23.4
North -23.2
As you can see by my results I lost some mph which tells me I might be able to lower my gear ratio a little.
So what does this all mean? Stock Ceramic magnets are a crap shoot for sure. Some guys buy many sets to try and find a decent pair to race and at $6 a pair, that can add up quick. You can Zap the magnets but as we have seen here..... they only stay charged for so long and then need re zapped. Not until this past Summer did we have a Magnet Zapper here which has been a great help for us in this class. I know having a Zapper is not in most racers budget as was ours but we came came across a deal that was to good to pass up. The best set of Ceramic magnets that I've seen read -.25 on my scale.
Many road race clubs that race the G cars have made the switch or are about to and I've read that some will allow both which sounds fair to me.
As of January 1, 2010 these magnets will be legal in ISRA's MM/PS class as will the current stock ceramic motor magnets.
Part #
290 G+/G3/G3R BONDED MOTOR MAGNETS CERAMIC GRADE NEW!!! $10.00
Lucky Bob's has them:
www.lucky-bobs-slot-cars.com/index.html
Scale Auto has them. Not listed. You have to call them
www.scaleauto.com/
and I have seen some listed on Ebay.
I was able to do some testing this week and would like to share the results with you.
My base test car was my Larry Morgan Mustang that TQ'd this past week with a .3690 E/T and won the final with the same E/T. Once I powered up the track for some testing I made two more runs before switching motor magnets.
Old Ceramic Magnets
Run #1 .3727 @ 40.83 mph
Run #2 .3745 @ 40.58 mph
After tearing down the car and checking the magnet strength on my cheap pocket scale I found that the magnets read
South magnet - 20.0
North magnet -19.1
I found this odd because on Friday before the race I re-zapped them and they were both reading in the -23. range. With only about 6 runs on the car they magnets have already weaken.
Bonded Ceramic Magnets
Before I put these into my chassis I tested them on the scale.
South -23.4
North -23.2
As far as E/T'S
Run #1 .3745 @ 39.64 mph
Run #2 .3706 @ 39.41 mph. Car was cooled between runs.
Magnets were retested for strength after testing. No difference at all.
South -23.4
North -23.2
As you can see by my results I lost some mph which tells me I might be able to lower my gear ratio a little.
So what does this all mean? Stock Ceramic magnets are a crap shoot for sure. Some guys buy many sets to try and find a decent pair to race and at $6 a pair, that can add up quick. You can Zap the magnets but as we have seen here..... they only stay charged for so long and then need re zapped. Not until this past Summer did we have a Magnet Zapper here which has been a great help for us in this class. I know having a Zapper is not in most racers budget as was ours but we came came across a deal that was to good to pass up. The best set of Ceramic magnets that I've seen read -.25 on my scale.
Many road race clubs that race the G cars have made the switch or are about to and I've read that some will allow both which sounds fair to me.
As of January 1, 2010 these magnets will be legal in ISRA's MM/PS class as will the current stock ceramic motor magnets.
Part #
290 G+/G3/G3R BONDED MOTOR MAGNETS CERAMIC GRADE NEW!!! $10.00
Lucky Bob's has them:
www.lucky-bobs-slot-cars.com/index.html
Scale Auto has them. Not listed. You have to call them
www.scaleauto.com/
and I have seen some listed on Ebay.
