I am looking at a couple ignitions. one is Mallory HyFire VI Digital CD Ignition. i have two questions about this one.

1.It says something about you cant use it on distributerless ignitions.... but will it work with our cars?

2. The RPM window switch, could i use that to rig up a shift light?



I am also looking at the Crane HI-6 CD and MSD 6AL CD. i was favoring the Mallory ignition becuase of the two stage rev limit (<<MSD looks to also have this)and RPM window switch, but will it work? the MSD also says u cant use it with distributorless ignitions, but i know people have them on their cars, so i just want to make sure before i spend 200$ that it will work.

the msd , crane will not work properly specialy with the revlimiter, the only box i found to work well was the jacobs box. the reason the rev limit does not work is becuase the hot box fires leading and not the trailing coils and plainly shuts down the spark. you also do not need any hot box for the trialing, only leading.

why even get a rev-limiter box? how about don't over rev?



kevin.

some times the petal gets wedged down because of a shifted floor matt....happened to me today, is there a stock rev limiter? it went to 8 and stayed there intell i turned the car off

stock theres a rev limiter.



kevin.

i beg to differ on the stock rev limiter,,,,,,,,,,,,, my s5 and alot of other s4 and s5s that i do work on do not have factory revlimiters,,,,,,,,,,,,,,,,,,,,,, there has only been one car that i worked on and drove that had one , it was a 86 gxl.



now with the help of a wolf 3d i now have a properly operating rev limiter wich i hate but with the motor not broken in and now plainly broken i will keep it at 6500 rpm untill the new motor is assembled and fully tuned on the dyno and properly broken in.

mine doesnt have a rev limiter. dont ask how i know......

Rev limiters are for safety, you don't actually use them, they save you just incase



I'd always set one up

in the How to article on fc3s.org, for teh crane hI-6, he talks like the rev limiter works......

Wouldnt you be able to use any system as long as you have 2 boxes? Leading/Trailing?

Yeah... i accidently took mine to about 8300. No limiter there.

yeah......but isent your car a s5, witch redlines at 8k?

ok, go out there and floor your car...the needle doesnt just keep spinning.. generally around 8500 it stops moving (depending on year/model..bla bla bla)



anyway...wanna know a GREAT rev limiter?



your FOOT.



kevin.

Don't waste your money on the digital boxes. All that you need is the regular box(ie. msd-6al, crane hi-6, etc.). You will also need three of these to upgrade your entire ignition. One for the leading coil and two for the trailing coil. The reason you need two for the trailing is because it has two coils controlled by one ignitor. It should be straight forward on the wiring and the only problem you might have is finding a spot to mount all three boxes. BTW if you don't want to go with all three I would suggest just upgrading the leading only and then upgrading the trailing later. This will keep you from overpowering the the leading plug which is the primary plug for ignition. Hope this helps.

im gonna disagree

you should https://www.nopistons.com/forums/pub...IR#>/smile.png. im just playing stoopid https://www.nopistons.com/forums/pub...IR#>/smile.png.



Rev limiters are a 'fail-safe' in case something unpredictable happens (stuck throttle, whatever) or if youre just stupid. either way its always good to have a preventative measure in place whether its a fuel cut, ignition rev limiter etc.



my t2 has one built into the wolf so im good.



kevin.

i wont. you guys have heard the story about our race car, so i'll tell the other one here.



theres a guy, mike johnson, of johnson racing engines, who built motors for some guy. they used revlimiters on the motors, this one guy kept having engine failures, while the rest of his customers didnt. i dont know how they figured out the problem, but they removed the rev limiter and his engine problems went away.



it seems like over a certain rpm range (8000+) that revlimiters are violent enough that it can cause more damage than overrevving the motor. actually in our case it caused more damage than enything else ive ever seen.

sorry for digging this 3 year old thread up haha.



i was thinking about a rev-limiter by ignition cut-off for my car. The Power FC has a REV-Limit function in it, but its a fuel-cut type.. very bad on a rotary.. so i set it up to the highest point possible (9900rpm), so i am sure NOT hitting it. I have been told that only the ignition limiter would be ok on a rotary engine.. after i read j9fd3s post, i am a bit confused https://www.nopistons.com/forums/pub...IR#>/wacko.gif



was it an ignition limiter, or just a fuel-cut type? I could just control my foot.. yes.. but i am not the best driver out there, and if i loose grip (to have some fun haha) its easily possible to overrev the engine.. so it would be nice to me, to have a safe-rev-limiter, but dont want to damage my engine either.

Shutting off the car or hitting a fuel cut switch is good enough for me! https://www.nopistons.com/forums/pub...IR#>/smile.gif

well, it seems MSD offers a low-cost CDI named "StreetFire", here is the link to it: http://www.street-fire.com/cdiignition.html



Not much data about it, but its lower on amps compared to the MSD 6AL.



MSD 6 AL:

Current Requirements:

5 Amps-5,000 RPM

10 Amps-10,000 RPM



Street Fire:

Current Requirements:

3.5 Amps-5,000 RPM

7 Amps-10,000 RPM



also the rev-limit on the 6 AL is via Modules that you plug in. The StreetFire unit has rotors like the Crane Hi-6.



all the other stuff seems to be the same, well whats the deal with the current requirement stuff? Is it better to have a higher requirement like the 6AL does?



is it also possible to USE the rev-limiter with only one box? via relais, which turn off the trailing ignition also?