What resistor to use?
#1
Junior Member
Thread Starter
iTrader: (1)
Join Date: May 2012
Location: Powell, Ohio
Posts: 124
Total Cats: 0
What resistor to use?
I just picked up some supra black top injectors part number 23250-42010, I'm running an MS1 v3 board. I read in another thread that brain said to use a 50watt 10 ohm resistor wired inbetween each injector ground, is that correct?
#5
Another way would be to go to jbperf.com and buy a PWM injector driver board and wire it inside the MS. This would allow you to drive PWM injectors directly.
FWIW: I ran 450cc dsm injectors in my miata with 10ohm 10watt resistors with no ill effects (the guy that bought it from me still drives the **** out of it without issues)
FWIW: I ran 450cc dsm injectors in my miata with 10ohm 10watt resistors with no ill effects (the guy that bought it from me still drives the **** out of it without issues)
#6
Junior Member
Thread Starter
iTrader: (1)
Join Date: May 2012
Location: Powell, Ohio
Posts: 124
Total Cats: 0
Yeah I'm probably going to end up buying some resistors and wirig them inline with the injectors. Is there any stores that sell that high wattage of resistor? I know radio shack doesn't carry that high, but idk what other types of places would other than online
#7
Senior Member
iTrader: (1)
Join Date: Sep 2011
Location: Lambertville, NJ
Posts: 1,215
Total Cats: 74
14.1V/10Ohms = 1.41A.
1.41A x 14.1V = 20W.
So even if your injectors had 0 resistance of their own and you had a 100% duty-cycle, 50W would be waaaaay over-sized.
Chassis mount resistors can exceed their watt rating considerably when properly cooled. That would mean bolted to a heat-sink (like the MS housing for example).
So 10W should be sufficient. They can be had at Mouser or Digikey.
Mouser
1.41A x 14.1V = 20W.
So even if your injectors had 0 resistance of their own and you had a 100% duty-cycle, 50W would be waaaaay over-sized.
Chassis mount resistors can exceed their watt rating considerably when properly cooled. That would mean bolted to a heat-sink (like the MS housing for example).
So 10W should be sufficient. They can be had at Mouser or Digikey.
Mouser
Thread
Thread Starter
Forum
Replies
Last Post
Zaphod
MEGAsquirt
47
10-26-2018 11:00 PM
300zxrb26dett
Miata parts for sale/trade
0
09-22-2015 12:43 AM
JacksonRacingEngines
Engine Performance
10
09-10-2015 09:52 AM