Cheap Rev limiter?
- subarooster
- Junior Member
- Posts: 204
- Joined: Tue Feb 26, 2008 7:03 pm
- Location: Coolgardie, WA
Cheap Rev limiter?
Okayy, had a thought today. I've been looking around at rev limiters lately (ignition cut ones) and most units have come up at around $400 - $500. So it got me thinking. i wonder can i manufacture one for under $50? I had a look at the old "monsta" tacho i had that i never use and got an idea. If I hook up the tacho and use the shift light as a trigger for a changeover relay, it might just work. I was thinking of running the negative side of the coil through the (always on) pins on the relay (30 and 87A) and then when triggered it will change over to the other pin (87). This will hav to be earthed so the spike has somewhere to go, otherwise it will feedback and cause pre ignition. So set the shift light to come on at say 6000rpm and as soon as it hits that the relay will changeover, then it will change back, then changeover ect... cutting the ignition briefly. The way i see it, i think i can get it to cut at around 5 times a second to giv that lovely brap! brap! brap! sound. And because its cutting the ignition instead of the convention fuel cut, it mayy shoot small flames from the exhaust. The idea sounds a little riceyy and boy racer but i'm keen to giv it ago. Tomorrow arv i shall have a go and report back. Cheers, Tom
Current Projects: *Offroad Racing MY Touring Wagon.
* EA82T Jap spec L series Wagon.
Previous rides: *Supercharged EJ25 Rwd Brumby
* 2 x 91' L series Ej20, 3 inch lift, mud tyres.
01' Liberty B4.
- BaronVonChickenPants
- General Member
- Posts: 1187
- Joined: Tue Oct 04, 2005 10:00 am
- Location: Nowra, NSW
The old GTHO phase III Falcon's had a "magical silver box" that worked in a similar way, I imagine they would have been dumping a lot more raw fuel than your tiny little suby engine, but then it's only until the revs drop below the ignition cut, which shouldn't take too long.
I think the concern should be the result of dumping unburnt fuel into your cat converter, they really don't appreciate that sort of thing.
Jordan.
I think the concern should be the result of dumping unburnt fuel into your cat converter, they really don't appreciate that sort of thing.
Jordan.
To become old and wise, first you must survive being young and dumb.
- subarooster
- Junior Member
- Posts: 204
- Joined: Tue Feb 26, 2008 7:03 pm
- Location: Coolgardie, WA
haha the test subject is a shagged ea82 so i'm not overly concerned on it imploding.. just curious, thats all. and the cat converter is buggered as well so all good.
Current Projects: *Offroad Racing MY Touring Wagon.
* EA82T Jap spec L series Wagon.
Previous rides: *Supercharged EJ25 Rwd Brumby
* 2 x 91' L series Ej20, 3 inch lift, mud tyres.
01' Liberty B4.
- Gannon
- Senior Member
- Posts: 4580
- Joined: Sat Nov 05, 2005 10:00 am
- Location: Bowraville, Mid Nth Coast, NSW
You hoon.
I might have to come over to see this
I might have to come over to see this
Current rides: 2016 Mitsubishi Triton GLS & 2004 Forester X
Ongoing Project/Toy: 1987 RX Turbo EA82T, Speeduino ECU, Coil-pack ignition, 440cc Injectors, KONI adjustale front struts, Hybrid L Series/ Liberty AWD 5sp
Past rides: 92 L series turbo converted wagon, 83 Leone GL Sedan, 2004 Liberty GT Sedan & 2001 Outback
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Ongoing Project/Toy: 1987 RX Turbo EA82T, Speeduino ECU, Coil-pack ignition, 440cc Injectors, KONI adjustale front struts, Hybrid L Series/ Liberty AWD 5sp
Past rides: 92 L series turbo converted wagon, 83 Leone GL Sedan, 2004 Liberty GT Sedan & 2001 Outback
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bee r rev limiter does this. ignition cut....and almighty backfire and flames occur,,,
davo
davo
no more subarus
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- Outback bloke
- Senior Member
- Posts: 2103
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- subarooster
- Junior Member
- Posts: 204
- Joined: Tue Feb 26, 2008 7:03 pm
- Location: Coolgardie, WA
haha yeah, but i wanted to make it adjustable. Tried and tested yesterday and had pleasing results. but way to over the top for my liking... Sounded like a WRC car at full revs before take off but ripped it all out due to it being very gay. lol
Current Projects: *Offroad Racing MY Touring Wagon.
* EA82T Jap spec L series Wagon.
Previous rides: *Supercharged EJ25 Rwd Brumby
* 2 x 91' L series Ej20, 3 inch lift, mud tyres.
01' Liberty B4.
- Gannon
- Senior Member
- Posts: 4580
- Joined: Sat Nov 05, 2005 10:00 am
- Location: Bowraville, Mid Nth Coast, NSW
Did you video it?
I wanted to see it
I wanted to see it
Current rides: 2016 Mitsubishi Triton GLS & 2004 Forester X
Ongoing Project/Toy: 1987 RX Turbo EA82T, Speeduino ECU, Coil-pack ignition, 440cc Injectors, KONI adjustale front struts, Hybrid L Series/ Liberty AWD 5sp
Past rides: 92 L series turbo converted wagon, 83 Leone GL Sedan, 2004 Liberty GT Sedan & 2001 Outback
------------------------------------------
Ongoing Project/Toy: 1987 RX Turbo EA82T, Speeduino ECU, Coil-pack ignition, 440cc Injectors, KONI adjustale front struts, Hybrid L Series/ Liberty AWD 5sp
Past rides: 92 L series turbo converted wagon, 83 Leone GL Sedan, 2004 Liberty GT Sedan & 2001 Outback
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- discopotato03
- Senior Member
- Posts: 2134
- Joined: Sun Mar 18, 2007 9:29 am
- Location: Sydney
- Gannon
- Senior Member
- Posts: 4580
- Joined: Sat Nov 05, 2005 10:00 am
- Location: Bowraville, Mid Nth Coast, NSW
So how high will an EA82 rev till it runs out of puff?
Surely if it can rev past 5k under load, it would have enough flow to rev much past that without any load.
Maybe ignition timing and valve bounce play their part in limiting its revving capability
Surely if it can rev past 5k under load, it would have enough flow to rev much past that without any load.
Maybe ignition timing and valve bounce play their part in limiting its revving capability
Current rides: 2016 Mitsubishi Triton GLS & 2004 Forester X
Ongoing Project/Toy: 1987 RX Turbo EA82T, Speeduino ECU, Coil-pack ignition, 440cc Injectors, KONI adjustale front struts, Hybrid L Series/ Liberty AWD 5sp
Past rides: 92 L series turbo converted wagon, 83 Leone GL Sedan, 2004 Liberty GT Sedan & 2001 Outback
------------------------------------------
Ongoing Project/Toy: 1987 RX Turbo EA82T, Speeduino ECU, Coil-pack ignition, 440cc Injectors, KONI adjustale front struts, Hybrid L Series/ Liberty AWD 5sp
Past rides: 92 L series turbo converted wagon, 83 Leone GL Sedan, 2004 Liberty GT Sedan & 2001 Outback
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- thatsgoodsquishy
- Junior Member
- Posts: 51
- Joined: Sun Jan 20, 2008 1:11 am
- Location: yarra valley, vic
I spent a couple years regularly winding mine out to redline (6 or 6.5?, cant really remember) and i thought it pulled fairly well at high revs, hence why i kept doing it:D
Mine was a red blooded super version from 85 though, dont know if the unleaded version had any changes that reduced top end power? I guess they wound the timing back a bit at least:(
I have very fond memories of my L
Mine was a red blooded super version from 85 though, dont know if the unleaded version had any changes that reduced top end power? I guess they wound the timing back a bit at least:(
I have very fond memories of my L
Ben
Current: MY 07 Outback 3L
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