Different approach to the rev limiter

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kdiqq
United States of America
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Location: Houston, TX

Different approach to the rev limiter

Post by kdiqq » Fri Nov 23, 2018 10:03 am

So a while back I tackled a really odd voltage issue (after replacing a coil) and I wanted to take out the last 'weak link' in the ignition system. I was getting a little tach fluctuation but my timing light showed really precise firing and advance. Like, shockingly good! The mechanical advance with a fresh spring does AWESOME. Anywho, I wanted to set out bypassing the rev limiter but didn't want to be without a limiter at all. I've never hit the rev limiter but, regardless, I found solace in having it there.

After some poking around, I found Beru actually makes a mechanical rev limiter built in to the rotor. It fits perfectly and is a super clever design. It has a plunger that grounds out the center post at 4500RPM. Dead simple. If the spring fails, it loses electrical contact and the rev limiter disables itself. So no chance of being left stranded! It was pretty cheap, something like 30euro. Lots of really good feedback from the VW forums. Totally not required but I wanted to share in case others appreciated the tip or had feedback!

Happy Thanksgiving!!

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Garrycol
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Re: Different approach to the rev limiter

Post by Garrycol » Fri Nov 23, 2018 8:43 pm

The 24v Land Rover FC 101 has them as standard on their engines but most owners glue them open as it is really not needed.

My Haflinger does not have a mechanical rev limiter so I have fitted one of these https://www.ebay.co.uk/itm/AccuSpark-Re ... 2a4f1e8561 but like the 101 is not really needed if you have a tacho.

Garry
1973 Haflinger AP700
1977 Landrover FC 101
2007 Range Rover Sport TDV6
1971 Jaguar Series 3 E-Type Conv
1957 Landrover 88" Station Wagon
1957 Landrover 88"

kdiqq
United States of America
Posts: 267
Joined: Tue May 26, 2015 3:30 pm
Location: Houston, TX

Re: Different approach to the rev limiter

Post by kdiqq » Sat Nov 24, 2018 10:42 am

Garrycol wrote:The 24v Land Rover FC 101 has them as standard on their engines but most owners glue them open as it is really not needed.

My Haflinger does not have a mechanical rev limiter so I have fitted one of these https://www.ebay.co.uk/itm/AccuSpark-Re ... 2a4f1e8561 but like the 101 is not really needed if you have a tacho.

Garry
Super interesting, I had no idea the things existed! It def isn't required, which is why most folks delete them altogether, but I thought it was more robust than a reman Pinzgauer unit.

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Derrickbwg
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Re: Different approach to the rev limiter

Post by Derrickbwg » Sat Nov 24, 2018 12:08 pm

I've had the one truck w the 4500 module still installed bounce off the limiter more than once. a few times offroad and once on road. I have to climb 1200ft in less than 3 miles to my house and the truck bogs in 4th and screams in 3rd to keep 28mph. it happened once when I wasn't paying attention on road after letting speed creep up.

I don't know how critical it is and if damage can be done crossing that threshold but it's an easy reminder that doesn't require paying attention to a tach. The other truck is jumpered but I'd consider that rotor just to see if it worked (so easy to try).

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2018 G63

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