Hi everyone,

Could anyone help me find a rev limiter for my Megane? I am tuning it with large turbo and and it's hitting the rev limiter hard around 5250 rpm.. I just want to move the limiter a bit higher and hopefully produce a bit more power.. :) I know that this is dangerous and it could end as an big disaster but I wanna give it a go... :D

Attached is my original file..

Thanks in advanced :)

It's not the rev limiter itself, the limit is done with the torque limiter that goes to zero at some point.

I know what you mean.. But it is not the torque limiter.. It was set to almost zero out at 4500 rpm, slows down the acceleration so it almost stops when on load.. :) But I increased the values , and set it to go to 6000 rpm.. Now it accelerate to 5250 rpm with no problems and hits the limiter like petrol engine, and you can hear the explosions at the exhaust when it hits it. :D I didn't think that diesel engine can behave like petrol but it is.. :D

Hopefully someone can help me. :D

Then I guess it has another (single value) rev limiter - unfortunally I can not help you here although I owned a 1.9 dCi months ago, but I never even knew it exists. I never revved it much over 4500 rpm, and that was enough for me. :oops:

I understand your wish to learn and try something new. :thumbup:

But why in the world would you like to rev a diesel much over 5k rpm? The combustion process is too slow on diesel engines to produce any more torque at higher rpm. And renaults aren't famous by their reliability anyway... :?

I also think that there is single value rev limiter somewhere, but can't find it. Hopefully someone can and is willing to help me. :)

The reason for me trying to rev it so hi is because I have a really big turbo for this engine.. It is a GT 22 hybrid turbo with variable geometry and 60mm compressor wheel capable of producing around 420 bhp. In my application it spools up effectively at around 3000 - 3200 rpm and can't reach it's full potential (air flow) at 5250 rpm, so i need to go a bit higher.. :) Someone will think that I am crazy for trying this but I'm not the first one to do it with success..

It is possible to do this with diesel engine for sure and this video proofs it : http://www.youtube.com/watch?v=eet8Q-Y5NVw

Following the big turbo are lots of modifications that I've done to my engine like: Ported and polished head, modified actual valves, custom exhaust manifold, custom 3" exhaust, bigger intercooler and piping, custom intake manifold ( It's a shiny crap and a reason why i'm pulling the engine out.. It was a temporary solution that doesn't work good), etc, etc.. Attached are some of the photos of engine and some of the parts.. :)

Still hoping someone will help me with my problem. :angel: :D :D

Thanks in advanced. :)

i think you choose the wrong engine to push it hard... maybe the rev limiter are "hardcoded" on ECU, since EDC are only for diesel engines and all that i've seen go to max 4500 or 5000 rpms...

Can you try to reedit rpm axis and increase final Rpm.On the diferent torque limiters.
Have try it?
Bye