Capa Kits

[Cobra]

This is the turbo pressure that is relevant to peak power. There are 2 revelant turbo pressures to understand, one is the figure which relates to peak torque, the other is the turbo pressure which relates to peak power. I hope that you now better understand how we look at and consider boost v peak torque and boost v peak power.

PETER

APS

thanks Peter,

I'm a little from the old school and tend to focus on the area of "pick up" of the car, that is, where the car is expressing its largest rate of gain in power, the area of peak twist

on the road, the "pick up" usually governs the performance through the bulk of the remaining rev range ... so IMHO it has more relevance

to ease off boost at high revs keeps the immediate internal temperatures down and the like (maybe even stop the motor from going "pop" too); so for me boost @ peakpower is somewhat a red herring as a statistic but more a safety/reliability issue

often wondered why the focus on boost at peak power, maybe its just smoke and mirrors which hint at impossible huge gains still to be had

[bcl]

I fully agree Rob.

Check out the APS Stage 3 dyno graph from 2/12/2003 that shows 327rwks.

The real shove in the back is between 3000 and 4500 revs, where power jumps 60rwkw, from 250 to 310, during which it runs 18 to 19.5lb boost.

After that, between 4500 to 6000 revs, power jumps only 17rwkw, from 310 to 327, with boost dropping from 18lb to 16.5lb.

Brian

[aps]

I fully agree Rob.

Check out the APS Stage 3 dyno graph from 2/12/2003 that shows 327rwks.

The real shove in the back is between 3000 and 4500 revs, where power jumps 60rwkw, from 250 to 310, during which it runs 18 to 19.5lb boost.

After that, between 4500 to 6000 revs, power jumps only 17rwkw, from 310 to 327, with boost dropping from 18lb to 16.5lb.

Brian

As I said you need to look at the boost level at peak torque and at peak power and of course across the entire rpm operating range, theres more to making high power/torque than turbo pressure alone.

PETER

APS

[Cobra]

I suppose it doesn't really matter about what exact figure is what !!

.... as long as we (the consumers in the market place) know what the industry convention is

(the convention being what Peter kindly pointed out in an earlier post)

[aps]

I suppose it doesn't really matter about what exact figure is what !!

.... as long as we (the consumers in the market place) know what the industry convention is 

(the convention being what Peter kindly pointed out in an earlier post)

No problem Rob, with the boost pressure graphs available the customer can always view the entire boost curve in any event. Its only a matter of asking for a copy of the boost graph, its that easy.

PETER

APS

[bcl]

I always like to see 3 graphs; power with 1.torque, 2.boost, 3.afr.

This data is captured and gives you the best idea of what's happening.

Brian

[Adam]

What's AFR?

[Cobra]

air to fuel ratio ....

[Adam]

What's AFR?

air to fuel ratio ....

All righty then!