Rev Limiter

[Burnzybubbles]

We need to be careful here, high BHP, low torque is not very accurate. If there is high BHP then there must be high peak torque too, as they are not mutually exclusive.

Remember BHP = Torque x RPM ÷ 5252

Or Torque = HP x 5252 ÷ RPM

Rpm always plays a factor too though that's why civic type R's don't do so well in the torque front.

 

[ibizacupra]

Not sure with these engines yet as I've not used one in anger, but the merit of revving it beyond the point of peak power is to remain in the power band when you change gear.

I'm sure these engines make a lot of power low down though.

the "Engine" will rev more..
BUT
The small hair dryer of a k03s will not flow enough to provide air for any power at higher revs.. Its all out of puff

Larger turbo, more airflow, engine will pull higher up the rpm range

fairly pointless ragging a std k03s car to 6800rpm limiter where its falling away torque and flow from 5500rpm

 

[Burnzybubbles]

the "Engine" will rev more..
BUT
The small hair dryer of a k03s will not flow enough to provide air for any power at higher revs.. Its all out of puff

Larger turbo, more airflow, engine will pull higher up the rpm range

fairly pointless ragging a std k03s car to 6800rpm limiter where its falling away torque and flow from 5500rpm

Would you mind if you have them to hand, put up standard 180 and 225 dyno's just for reference? Curiosity more than anything really and as Google search didn't really provide any great results without some serious trawling

Thanks.

 

[traumapat]

Personally Ill regularly take mine up to the limiter, It was worthwhile in my old modified MK1 , not so much in my unfettered MK2 but I just think it keeps the engine healthy.

 

[Brick_Top]

Please explain how it keeps your engine healthy.

We have discussed the merits of revving your engine higher, keeping it healthy is not one of them.

Remember RPM = wear

 

[mty12345]

the "Engine" will rev more..
BUT
The small hair dryer of a k03s will not flow enough to provide air for any power at higher revs.. Its all out of puff

Larger turbo, more airflow, engine will pull higher up the rpm range

fairly pointless ragging a std k03s car to 6800rpm limiter where its falling away torque and flow from 5500rpm

This is the answer for the OP. Bill's the man, he knows his ****.

On the AUQ above 5500rpm, it's like you trying to run the 100m sprint while breathing through a drinking straw! You're also putting way more stress on the rods,valves and springs etc for no good reason.

Torque is the "real world" force that accelerates the car.

BHP is a measure of how much of that torque is being produced at a certain RPM,and is more useful when trying to calculate how much work a stationary engine that runs at a fixed RPM can do. The kind of engine you might find in a factory or electrical generator etc etc.

200lb/ft of torque being produced at 1000rpm will accelerate a car at the same rate at 200lb/ft produced at 2000rpm will.............. even though the BHP would be double!
Most large diesel engines in HGV's have a rev limit of 1500rpm, and hence low BHP, but they still pull 44 tons with ease.

 

[SlimsLCR]

This is the answer for the OP. Bill's the man, he knows his ****.

Agreed!!!

 

[SlimsLCR]

Agreed!!

 

[SlimsLCR]

Would you mind if you have them to hand, put up standard 180 and 225 dyno's just for reference? Curiosity more than anything really and as Google search didn't really provide any great results without some serious trawling





Thanks.

AUQ- 177bhp @5500rpm

173lb/ft @1,950 - 5000rpm



BAM- 221bhp @5,900rpm

207lb/ft @2,200 - 5,500rpm