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Lets cut the Peak HP s**t? 

 

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 Post subject: Lets cut the Peak HP s**t?
Posted: Tue May 23, 2006 11:38 am 
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Ok Lad's how about we put an end to this, lets face it, only good for winning dyno comp peak hp dyno reading s**t?
Next time you post your results how about taking an average of your engine performance across the useable rev range rather than quote just the peak figure? While you're at it do the same for torque figures?
Lets say we use 500rpm increments to create our averages?

Pete.
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Posted: Tue May 23, 2006 12:18 pm 
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hehe. My dyno sheet pg 2 also states the averages ;)

468ftlbs and 565hp as an average from 4500-7200rpm which is roughly the camshafts operating range (4500-7500). I'd like a roller camshaft but the mantainance is too high for my wallet to support. I hyd roller is too small for my requirements.

 

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Posted: Tue May 23, 2006 2:49 pm 
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lol....I agree.

And why is the x-axis of Dyno Dynamics dyno sheets always in kilometres and rarely accurate.

Dyno has become a dirty word. I blame hollywood.
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 Post subject: Re: Lets cut the Peak HP s**t?
Posted: Tue May 23, 2006 3:00 pm 
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XR9UTE wrote:
Ok Lad's how about we put an end to this, lets face it, only good for winning dyno comp peak hp dyno reading s**t?
Next time you post your results how about taking an average of your engine performance across the useable rev range rather than quote just the peak figure? While you're at it do the same for torque figures?
Lets say we use 500rpm increments to create our averages?

Pete.


i couldn't agree more, our engines hate revving and so many of these cams only produce power at the top end.
let's see someone get a cam with a nice power curve none of this mt everest curves!
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Posted: Tue May 23, 2006 3:05 pm 
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Lol, pete's had enough!

So.. what range shall we use? All the way from the start of the run to the peak?

I've worked back from the km.hr readings to get an idea of RPM, its a handful of calcs but nothing a primary school graduate shouldnt be able to do... maybe i could develop and post a spreadsheet where you can enter the diameter of the wheel, diff ratio and gear ratio and get an idea of the engine RPM?

Then enter the rwkw readings from an agreed set of points on our peak graphs to come up with an average over an agreed set of variables?

Would be happy to produce such a spreadsheet - i think it would make for an interesting excercise.

EDIT: Working on something now

 

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Posted: Tue May 23, 2006 6:50 pm 
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Ok, Rev ranges; That depends on how you've built your engine.
Brenx' is an example; obviously built for high rpm and superb example of CHI headed goodness and that torque figure just proves how good they are at maintaining port velocity.
So you can't blanket say "our engines are not built to rev" But, understand where you're coming from soulfire. If you're talking hyd roller equipped late 5.0's generally speaking it's a below 6000rpm proposition.
With that in mind you could give a 1500 or 2000 rpm starting point up to say 5500 or 6000 depnding on where your cutoff is.

Pete.
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Posted: Tue May 23, 2006 6:56 pm 
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http://www.fordmods.com/forums/viewtopic.php?t=28923

Can select the range of rpm you want to calculate the average rwkw from....

 

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Posted: Tue May 23, 2006 9:11 pm 
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I have dyno print out of how much power at 80 kph and 100 kph

 

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Posted: Tue May 23, 2006 10:11 pm 
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i hate peak power talk is bs most times

so what if u make 1gazillion rwkw at 19000rpm

if i can make 200rwkw from 0 to 6000rpm my car is faster :P

 

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Posted: Tue May 23, 2006 10:35 pm 
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ok to find the right RPM range for one average power, how about the top rpm point being the shift rpm you would use at the drags/race track. and lower point being the lowest rpm the engine drops too.

that way we get the actual used rpm of the engine, it mayt also show us how well we built/moded the engine to how we drive them


there is a good gear calc program that will tell you that info on the quaife USA website



BTW my car makes an average of 134 rwkw from 3300 to 5300 rpm
peak power is at 4650rpm
with 121@3500 peak of 146@4650 and 140@5300

between 4300 and 5300rpm there is 140 or more kw

will be interesting to see it out at the drags again. there was a big jump in average power in my used RPM range with the fresh engine, the old one was very peaky compared to this one

 

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Posted: Wed May 24, 2006 12:35 am 
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i make peak power at 7 inches

 

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Posted: Wed May 24, 2006 9:18 am 
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-clampy- wrote:
i make peak power at 7 inches
ROFL

now now clampy u are bragging just abit there i swear it was only 5 last nite!

 

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Posted: Wed May 24, 2006 12:12 pm 
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Generally average rpm is taken from the cams working rpm.

If your cam starts @ 2000rpm and stops making power @ 5800rpm? That is where you want to work out your averages.

If it makes it off idle - 4000rpm? Thats were you'll calculate from.

It's going to vary on each setup. Anything below 4500rpm on my engine powerwise is irrelevant as I have a 5400rpm stall convertor. Although it happily cruises between 2000-4000rpm without any issues.

 

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Posted: Wed May 24, 2006 12:22 pm 
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xr8ute wrote:
And why is the x-axis of Dyno Dynamics dyno sheets always in kilometres and rarely accurate.


All people have to do is ask the operator to plot against rpm and they will.

 

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Posted: Wed May 24, 2006 7:41 pm 
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Disco Frank wrote:
i hate peak power talk is bs most times

so what if u make 1gazillion rwkw at 19000rpm

if i can make 200rwkw from 0 to 6000rpm my car is faster :P


well the truck i am driving at the moment makes 575hp at 1900rpm

 

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