Max Revs??

if yr car is making peak power at 6 or 6500 why rev it to 9?

Common guys - listen up and listen to what calibrator is saying(said twice). 😛 😛 😛 😛 😛

The Calibrator wrote:

It pointless changing at 6 if yr max power is there as you will be dropping off your torque curve in the next gear.
Thats the reason u say the car went better when u revved it till 7.

actually - first he said that... then he said this:

The Calibrator wrote:

if yr car is making peak power at 6 or 6500 why rev it to 9?

bit of a contradiction in terms.

what is it then? rev past the power/torque peak, or not?

Its not a contradiction in terms at all.
Its a fact that you have to rev yr car past the peak power point HOWEVER there is no point in revving to 9 if the peak power point is at 6 or 7 thousand as the power drop off will be substantial.
If you try and rev your stock ca18 to 9000 it will probably make less power than it does at 2000rpm.

If this doesnt make sense I suggest some study of dyno graphs with particular emphasis as to what happens to the shape of the curve after peak power.

The Calibrator wrote:

If you try and rev your stock ca18 to 9000 it will probably make less power than it does at 2000rpm.

If this doesnt make sense I suggest some study of dyno graphs with particular emphasis as to what happens to the shape of the curve after peak power.

LOL - i must've misunderstood something. and yeah it was late.

i do understand the peak and dropoff principle!

I guess what the man is trying to say is

If your peak is at 6000 a good shifting point would be at 7000 if your RPM drops off a 1000 when shifting... there is no need go beyond that? Point.

Converting to a solid lifter setup isn't going to help at all like Duane said, I took for granted in my post that the cam your changing too, would have longer duration and higher lift 😉

I personally rarely look at my rev counter when shifting, if you have to ask me where my Polo's peak exact peak power sit I'll guess 4500rpm, i'm not sure, I concentrate on my driving rather than staring at a dial... after a while you "feel" the car, sound and torque play big roles... But yeah I can honestly say I can't do this in my SX, haven't been driving it nearly enough, with the new engine its gonna change anyway I felt it with the first build attempt. And to say also I don't drag race 🙄

Ok I've been talking enough kak for one night, I'm about a drink ahead, and 2 hours behind in sleep 😉

Vlade wrote:

unlike tin can brother the SR, which needs rocker stoppers

Play nice 😛 .... We dont need to rev, our cars just give lumps of torque all the way to 6500.....

veecee wrote:

and the story about the SR's floating valves at high rpm??? is that a sales pitch to move those SR rocker arm plate thingy's, or does it really happen???

the reason i ask is that i've read plenty that you need to buy those things!

I've heard them too, I think the N/A ones can rev high???

Yes that is true but hydraulic lifters are no good for high reving cars. They will cause valve bounce, and hence the peak power is lower than it could be. With the change to solid lifters the motor will not experiance as much valve bounce and therefore more power can be made.

warre hell??

my car revs till like 7500+ and it's happy with that 😀