NatAsp12A

Okay so I've been watching some videos on YouTube that have a FB that has a 12A with a rev limiter or a 2 step launch control system on it. And I was wondering how it would be installed and if anyone could tell me how to install one. Thanks!

heynoman

iTrader: (5)

The set up is actually pretty straight forward. But you will need a aftermarket ignition system. I like the Mallory 6al but you can used any brand you like. There's msd and super bee r but I think sbr is just a rev limiter and not amplifier and several other off brands no ones ever heard of . Basically you can run it like a stock set up or direct fire. I remember there being a write up on this somewhere by smbaker??? Anyhow what kind of set up do you plan and running and why do you want a rev limiter ??

NatAsp12A

I want a rev limiter so I can do some kickass torque launches and hopefully get some good backfires lol. And I wanna keep it carbed, I don't really want msd injection.

NatAsp12A

I apologize, I did not know msd made ignition boxes

Qingdao

iTrader: (3)

He's a troll... I'm calling it.

NatAsp12A

No man my dad's 86 Chevy has msd fuel injection, I thought they just made fuel injection systems.

heynoman

iTrader: (5)

Msd make a wide arrangement of performance products I was actually surprised when I found out that they made part for fuel induction . One of the main things they are known for are their ignition system which are used in almost every top fuel dragster I ever seen. I believe they also bought out Mallory.

lduley

iTrader: (1)

They did and i think another company also

heynoman

iTrader: (5)

Yup looks like they are also racepak , accel , mr gasket , and Holley or vise Versa I think Holley bought msd out which would make sense why their throttle bodies a almost identical.

peejay

Do you like broken engine parts? Because rev limiters are how you get broken engine parts.

peejay

Maybe just really young. Like thinking Disturbed wrote that one 50 year old song.

MSD stands for Multiple Spark Discharge... ignition systems are kind of their thing and has been since the late 60s.

Jeff20B

iTrader: (13)

You should tell him about how your 12A got up passed 8400 on trailing alone, which was stock, after the MSD had done its rev limit thing on leading, and broke stuff.

erick31876

iTrader: (8)

+1 don't use it

peejay

Trailing WASN'T stock, though. It was bumped up significantly. I'd like to say turned up to only 8 degrees of split, and the vacuum advance was hard-connected to ported vacuum instead of going through a solenoid for finer control.

When I had the MSD direct fire leading-only on a completely stock car, 7000rpm limit WAS 7000rpm. Very smooth, too, the engine didn't stutter, it just stopped accelerating.

That is why I expected that to be the case... didn't expect the engine to run up that high on trailing alone. Live and learn!

I do have a 2 step (on both sets of plugs...) but it's not for sitting there stuttering, it's strictly for a flat shift. When I push in the clutch to shift, it kills everything. No stutter, just off. Stuttering kills stationary gears and apex seal slots.

There's also no popping and banging from the exhaust, either.

One of my friends has kind of the same setup on his Miata and it does throw several feet of kabang out the back. Also builds 4psi boost just sitting there. It's kinda neat. It's a bit hard on engine parts though, probably a good chunk of why he sawed the block in half up to the cylinder walls...

NatAsp12A

So if I were to install a rev limiter like a msd, would I want to set it up on the leading or trailing plugs, or both? And how does a rev limiter result in broken engine parts? Doesn't it just cut off the spark?

NatAsp12A

All I would really want a rev limiter for is for 2 step launch control and to get some "kabang" out the back every now and then.

Qingdao

iTrader: (3)

Hook up the factory air pump.... You'll shoot 4' flames every time you engine brake.

First RX7 I had, had a not so good exhaust and it leaked a little air in. BIG fire *****. I loved it. My neighbors not so much.

peejay

You won't benefit from a launch control with a 12A, and you won't get a kabang. All you get is broken stat gears and worn rotor slots.

NatAsp12A

Could you explain to me why this would happen peejay? I'm looking at a MSD 6al with a rev limiter and a "2 step" option, I've seen videos, and theres no studder, its a constant limit almost like a govenor, but there's backfire, is that bad for a rotary? I know theyre prone to backfires so I'm not sure if that's bad or not.

j9fd3s

iTrader: (3)

the on/off* of the rev limiter is really hard on the rotary. its much better to just let it over rev.

one of those little piston/rotary differences.

if you stay on the rev limiter for a long time, this is the haps; FC3S Pro v2.0:&nbsp K2RD HOF

NatAsp12A

So how could I get some cool and loud pops put of the exhaust? I already plan on doing some exhaust to it.

NatAsp12A

https://m.youtube.com/watch?v=Bm6Rqc6R_2A this is a rx7 12A with a Megasquirt 2 on it, now is this bad for a rotary?

Qingdao

iTrader: (3)

Attach the stock air pump without the other supporting "clean air" things. It'll pump in a bunch of fresh air to your rich exhaust and pop pop pop... fireballs.

NatAsp12A

Do you have a link that shows me how to do this?

NatAsp12A

Oh and also when you say "clean air things" do you mean emissions or clean air that's going into the engine? I'd assume you're talking about emissions, but I figured I'd ask since honestly I have no idea what the air pump does in general.