How to get a bit more torque out of my 172??

[-Dan]

Trouble is the F4R actually ISNT "designed to be revved", its designed to be moderately torquey in the midrange if you look at things like the bore and stroke and rod ratio of the bottom end, but then renault tuned it to rev, which means its a massive compromise, you have an engine that doesnt naturally want to rev, being used out of its comfort zone geometry wise just because its got fairly hot cams.
What an F4R design really lends itself well to is 5Krpm and a bar of boost!

Does this mean it's a bad design for the job? Or have Renault just formed (and quite sensible) a costing saving exercise?

 

[bozothenutter]

RS2 does nice things to the torque spread, I imagine increasing the comp might aswell.....not cheap options though

 

[Chip-mk1]

Does this mean it's a bad design for the job? Or have Renault just formed (and quite sensible) a costing saving exercise?

If you were designing an engine to rev, it wouldnt be an F4R.

 

[Dan@SJM]

Does this mean it's a bad design for the job? Or have Renault just formed (and quite sensible) a costing saving exercise?

They designed it to do 180bhp and 40mpg. And they've done that fairly well.

 

[-Dan]

They designed it to do 180bhp and 40mpg. And they've done that fairly well.

I think people forget the efficiency to power ratio on these engines. You couldn't be more right.

 

[105e]

They do work quite well but are a poor design for a high revving performance engine, although that long stroke may help the torque figure.

 

[Chip-mk1]

As a standard engine they are a good package, they just are ultimately quite limited in terms of what further gains you can get.


As Dan says, the economy is very good for a fairly high output unit, its only engine I can think of in that respect which matches the old XE lumps (although those are a lot more tunable!)

 

[Big Spence]

Thanks alot for all this guys give me a lot more insight into the routes to go down or not go down, think I'll just put a NiRUreasonably quiet after market catback on it, highflow filter and a remap

 

[Chi]

Turbo it

 

[Big Spence]

F***king autocorrect. Haha

 

[Big Spence]

If had the money mate id do it