How to raise RPM limit

[cali yaris]

I think Jason ran up to 7000 on stock everything. Stock is 6250. I am at 7300 with upgraded springs only. Our new spring kit would let me go to 8000.

My car n/a though, even with bolt-on mods, stopped making power about 5800 (thus the stock rev limit, most likely). No reason to rev higher unless a dyno shows that you're making power up there and would benefit.

[Jason@SportsCar]

Our Runoffs race setup is 7300rpm with stock springs and JUN cams - previously ran 7300rpm with the stock cams as well - most of the year we turn it down to 7100rpm.

Might try some MI spring this next season and see if the car will make power past 7300rpm. The dyno indicates there is more up there, we just have not wanted to push the valve train or crank that hard yet. Now that I have a spare engine I am willing to push it a little harder.

[b20vteg]

Originally Posted by cali yaris

No reason to rev higher unless a dyno shows that you're making power up there and would benefit.

exactly.

[xnamerxx]

Bringing this back from the dead, what exactly is the downside of doing this to the ECU?

[CTScott]

Originally Posted by xnamerxx

Bringing this back from the dead, what exactly is the downside of doing this to the ECU?

As I mentioned in post 7, changing the clock frequency could cause a variety of problems, including communication problems between the ECM and the other ECUs, or could cause much more catastrophic issues, like runaway conditions.