Archangels

i was wondering, i have an MSD6AL ignition and it has a rev limiter add on that i can purchase to have a launch control, however someone down the grape vine had told me the MSD boxes and the rev limiter and launch control are hard on a rotary engine when you use them, just wondered if anyone out there could clarify that for me....

also, if the MSD box is not an option how about a Bee*R rev limiter?...

not sure the difference between the two, it was my understanding that they both cut spark, but if something can result in possible damage to my engine, i rather not use it!, however i did think there was a difference between a rotary using a limiter and a piston engine?...

let me know what you guys think, thanks!...

Black Knight RX7 FC3S

iTrader: (7)

i was going to go with a bee*R. then i keep reading how rev limiter were harmful to rotaries. i think people are confused between spark cut and fuel cut limiters. i dont know about other people but id rather have a spark cut then detonation from leaning out with a fuel cut.

jjwalker

I believe the ECU uses a spark cut to put the car into limp mode. For example, if the oil metering pump stops working or the ECU doesn't recieve a signal. Point being, if the ECU uses it instead of a fuel cut, I wouldn't worry too much about cutting spark. Also, running raw fuel through the engine isn't going to hurt unless you hang out on the rev limiter for whatever odd reason. I say stick with a spark cut.

If you drive your car properly, then you probably shouldn't ever have to worry about hitting the limiter. It is a safety mechanism, not a "shift now" indicator.

junito1

Well if its not harmaful to the motor its definately harmful to the turbo. Either way your spending money for unreliability.

Its not an important mod unless you drag race.. IN my opinion.

jjwalker

My point exactly. Rev limiters are a safety net, not a fancy shift light.

eage8

iTrader: (9)

it'll only cut leading ignition and trailing will still operate... this can lead to some weird things like misfiring and the turbo over boosting.

EDIT: if you really want something like that I would get a stand alone that supports it and control it from there.

Black Knight RX7 FC3S

iTrader: (7)

i need one for drifting, my stock limiter doesnt even work.

jjwalker

What track do you go drifting at?

eage8

iTrader: (9)

I would find out why your stock limiter doesn't work...

why do you say it doesn't?

Black Knight RX7 FC3S

iTrader: (7)

i drift at englishtown when clubloose gets started this spring, mean time its just empty lots and less trafficed streets.



i normally go into a turn on 2nd and my rpm goes to 8k and feels like it keeps going with no bounces off the rpm.

Archangels

i want it for launching seeing as i drag race frequently....

when my first MSD box "went" the turbo did some weird things, it did overboost for a split second, thankfully i caught it before any damage resulted....

either way, both are spark cuts, which do you recommend?...

jjwalker

I'd just use the MSD add-on since you already have the 6A box. That just makes sure everything is more likely to play nice with each other.

g14novak

iTrader: (1)

My buddie has 2 6AL boxes in his bp 5 letter with the rev limiter. It works perfectly fine. The car has been running hard for about 2 years now going to the track every Wednesday and Friday.

Not very good for turbos, but if your all motor, it shouldn't be that bad. Just as long as your not bouncing off the limiter all the time, I don't see a issue.

Archangels

i'd be using it for no-lift shifting aswell as launching at the track....

i could care less about the turbo, if it gets tired it'll just get upgraded with something that weilds more potential....

:P

Rob XX 7

iTrader: (8)

thing is you cant use just one 6AL box, you would need 2, otherwise the set of coils without the rev limiter will still fire

iginition cut rev limiters are what you want on these cars, not fuel cuts.

maybe invest in a shift light, they make nice, small self contained ones. The factory tachs in my 2 FCs are off almost 1000rpm at redline.

afpreppie04

iTrader: (5)

IIRC you would actually need three, one for the leading coils and two for the trailing, since they are separate.

Rob XX 7

iTrader: (8)

even more!

Archangels

**** that then....

i just used the one box for the leading coils and it seemed to do the trick, it would hang and have a rough "misfire" when it was at the target RPM, and actually built boost.... hmm....