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| XR9UTE |
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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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| brenx |
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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.
_________________ XB Fairmont sedan 11.07@123.02mph |
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| xr8ute |
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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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| Soulfire |
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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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| 4.9 EF Futura |
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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
_________________ I promise..... I will never die. |
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| XR9UTE |
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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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| 4.9 EF Futura |
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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....
_________________ I promise..... I will never die. |
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| EBXR8380 |
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I have dyno print out of how much power at 80 kph and 100 kph
_________________ As in ZOOM 126 edition |
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| Disco Frank |
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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 
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| tickford_6 |
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Posts: 6449 Joined: 11th Nov 2004 |
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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| -clampy- |
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i make peak power at 7 inches
_________________ current ride: worn out chuck taylors |
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| Disco Frank |
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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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| brenx |
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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.
_________________ XB Fairmont sedan 11.07@123.02mph |
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| stockstandard |
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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.
_________________ Stoke me a clipper, I'll be back for Christmas |
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| 351EL |
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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 well the truck i am driving at the moment makes 575hp at 1900rpm
_________________ Smoken the hides in top gear |
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