G-Dizzle

Whoa dude! What other uses do you have for comm drops!!!

Todd Putnam

Dave is a very, very twisted individual...

Sal Amato

iTrader: (27)

Hi todd
I got a turbo dyno about 2 months ago and am just now getting time to start messing around with it .I was wondering if you could give me some info on some profiles for stock and 19 turn motors .any info wold be great. Thanks Sal

Todd Putnam

Sal:Test at 5 volts, using automatic amp steps: 20,22,24,26,28,30
On my unit:
Stock: 78+ watts @ 30 is killer
19 Turn: 110+ watts @ 30 is killer

Hope this helps...

CypressMidWest

iTrader: (1)

I'm pretty sure the drop won't be sensitive to skin, but it's possible your skin might be sensitive to the drop.

Sal Amato

iTrader: (27)

Todd thanks alot for the info ,I really appreciate it!
SAL

kerry

iTrader: (1)

hey todd how come you don't test stock motors at 7volts? i have read that this is what they should be tested at. just asking because i too have just got my hands on a ce turbodyno and thats what i've been told. thanx for the input

CypressMidWest

iTrader: (1)

I'm not Todd, but I would assume it can depend on the application. It does me no good to look at 7 volt numbers if I run 4-cell oval or 12th scale.

Todd Putnam

Kerry: when increasing voltage, the curve is linear: if you increase the input voltage the exact amount from when comparing two motors, the increase in performance will be linear. 5 volts is easier on the comms and brushes while testing.
Hope this helps...

kerry

iTrader: (1)

thanx todd, is it more accurate to take readings at 5v for stock motors, if so why do motor companies show that the motor was dyno'd at 7v? should i test at 5v?

thanx again

Todd Putnam

Kerry: It's personal preference...as I stated in the earlier post, a better performing motor at 5 volts will still be a better performing motor at 7 volts.

I started testing at 5 volts with a CE Turbo Dyno when I worked for Trinity back in 1992 , because you could accurately dyno mods back then as well. Testing at 5 volts, especially with the brush compounds and magnets we had available then, proved to be far less damaging to the motor then testing at a higher voltage...such as 7. If you can still determine which motor is better at 5 volts, and due less damage to the brushes, comms and magnets while dyno testing, why would you test at a higher voltage?
I've heard from others that it is easier for them to see the difference from one motor to another when testing at a higher voltage, but after 14 years of using a Turbo Dyno, I know what I'm looking for and can see it just fine...
Again, personal preference...
Hope this helps...

Sal Amato

iTrader: (27)

Hey Todd
what kind of brushes do you use on the turbo dyno slave motor ,and how often does the motor need maintenance.
SAL

Todd Putnam

Sal,
I use some old CAM 2006 brushes. Tons of carbon and graphite, unbelievable long life...which explains why they were horrible back in the early 90's...
Slave motor on my production dyno, (100+/- motors dynoed a week) requires rebuilding about every 2-3 months. For a average racer,(depending on use and compound of brushes used) maybe once or twice a year.

Sal Amato

iTrader: (27)

Wow thats along time ,after testing about 20-30 motors my dyno was acting up ,so I cut the comm and it worked fine .I wonder why I had to cut so quick?

Todd Putnam

...you can't use silver brushes, or any that are hard o the comm...
call me at the shop and I can hook you up with some if you need them.