For dragstrip, is a rev limiter absolutely necessary? And technically how do they work? I don't see how they can limit your RPMs with the clutch disengaged and the pedal to the metal during powershifting.
Is a rev limiter absolutely necessary?
- Thread starter Cannoball888
- Start date
If you have a manual trans, and don't want to grenade your engine, they are a must. Imagine that missed shift, you bang your right foot to the floorboards and your RPM's go past the redline into 11k or more. BLAMMO!
They work in different ways, but the most common type just cuts the LT supply to the coil at a pre-set rpm. No spark, no revs. The better ones drop every other spark, progressively to give a softer limit rather than a load of nothing.
They work in different ways, but the most common type just cuts the LT supply to the coil at a pre-set rpm. No spark, no revs. The better ones drop every other spark, progressively to give a softer limit rather than a load of nothing.
Yeah, they just cut out the spark. I have the 6al which is ok but I would have rather had the one that cuts it out on 1,3,5,7 and then on the next round on 2,4,6,8 so you don't have a cylinder full of gas!
If you run nitrous you'll want something to shut it off before your limiter though or get smart and pull your finger off the button!
If you run nitrous you'll want something to shut it off before your limiter though or get smart and pull your finger off the button!
LMan
Founding Member
FORCED2DV8
New Member
Its a very good idea, unless you like blowing stuff up. It only takes one slip to go boom, The Rev limiters obove are easy and effective to setup. Well worth the money IMO
iskwezm
10 Year Member
i have the MSD Digital 6 and wouldnt run with out it,plus it has a 2 step, so when you want to launch, set the rpm to say 4500 RPM, lights start to come down,push the button(also works my line lock)you nail the gas and it will "bounce" at 4500,bam release clutch,the 2nd rev limiter will limit the max rpm you want, mines at 7500, but with the blower im gonna lower it to 6300.Plus the Digi6 has a start retard, so its easier to start and a boost retard so if yoiu run NOS,it will retard 2,4* when activated.
FORCED2DV8
New Member
same setup im running and i love it. well worth the money. if you run nos and it is only on a wot switch jacobs makes a nos controller that can close the nos solonoid when rpm limter comes on. it also has a rpm controller on it so nos only comes on at certain rpm or even gradually puts more nos on through rpm band.iskwezm said:
brianj5600
Active Member
They are needed on any car that has enough power to break stuff. I got away with one once when a rear end broke. Memory tach said 9200 rpm's, but the motor survived.
I would like to keep it simple but also prefer one as you mentioned that limits every other spark rather than giving nothing. What MSD models do this?limey66 said:
iskwezm
10 Year Member
the digital 6 does, i like it because is doesnt use "chips" to set rpm limiters, the older ones, the 6 series (a,al,t) use "chips you have to buy and plug in and are the dinosours of the line.Cannoball888 said:
The Crane Hi-6 is also a good choice.
Yeah,
I use the Crane XR-i ignition module which has simple dial on the top to set the rev limit. Car not really* on the road yet, so I can't comment on it's effectiveness.
My main experience with such things in on European 4 banger stuff, so I can't say what is available to you over there, but I'd follow some of the leads given above.
*Oh, sorry officer, I'm on a shake down run, I didn't realise I needed an exhaust/windshield/proper brakes/insurance/licence plate...
I use the Crane XR-i ignition module which has simple dial on the top to set the rev limit. Car not really* on the road yet, so I can't comment on it's effectiveness.
My main experience with such things in on European 4 banger stuff, so I can't say what is available to you over there, but I'd follow some of the leads given above.
*Oh, sorry officer, I'm on a shake down run, I didn't realise I needed an exhaust/windshield/proper brakes/insurance/licence plate...
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