Autosport Labs

has it got a rev limiter or do i have to buy the hard limiter extra?

thanks

The unit has a 'soft rev limiter' built-in. when activated, the ignition advance is retarded to zero degrees, significantly reducing engine power. For many, this suffices as a rev-limiter.

The hard rev limiter add-on module will trigger a power cut to the coils, acting as a hard rev limit. This is better suited for high-performance engines that would normally 'push past' the soft limiter.

More info here:
http://www.autosportlabs.net/Hard_rev_l ... nformation

The following page has some basic information on it

http://www.autosportlabs.net/MJLJ_V4_ve ... it_control

Basically if you have a road going normally aspirated engine the in-built rev limiter should be be sufficient. As the description states in the link it basically works by retarding the timing of the engine to zero therefore making it very in efficent and will reduce its power output.

If you have forced induction (FI) especially performance types, then its my understanding that you can still go over the rev limiter although at a reduced performance.

I'm sure people with experience with FI could pass on some greater knowledge of experience.

I believe both wont do any damage to the engine, the soft definately wont. The hard rev limiter works by reducing power to the coil pack, therefore a less efficent spark if i remember correctly

At the end of the day you only need the external hard rev limiter if you have a highly strung engine in my experience!!!! and the soft will normally do.

Beat me to it brent, lol

Funny! I like your answer better.

cheers guys... basicly i need the megajolt for a AX GTi with a 106 GTi engine with bike carbs

think i better get the hard limiter, rather £17 for the limiter than few hundred pounds for a new engine

The easiest way to describe what the soft limiter does is like suddenly hitting a really really steep hill. You can push on if you try (even in my 998 mini), but it's so noticeably down on power you have to intentionally keep your right foot in. As long and you don't drive it like a 17-year-old who's just passed his test, it's plenty effective enough. If you do drive it like a 17-year-old who's just passed his test and use the limiter as a shift light rather than changing up a little sooner, it's well worth looking at.