Post Miltek Dyno results
11-04-2007, 06:03 PM
#1
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Post Miltek Dyno results
Well just had dyno down post Milltek non valved/non res/100 cell cats, it gave 8kW/12 BHP @ the wheels.Done in 4th gear.
Pre milltek 217@wheels post 225.6 @ wheels
What i wont to know is this , if the guy testing did not hit the rev limiter, does this mean he had a few more revs to go and does this mean it still had more/kw/bhp to go?
Pre milltek 217@wheels post 225.6 @ wheels
What i wont to know is this , if the guy testing did not hit the rev limiter, does this mean he had a few more revs to go and does this mean it still had more/kw/bhp to go?
11-05-2007, 05:41 AM
#5
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Re: Post Miltek Dyno results
Dyno experts correct me if I'm wrong, but I think the dyno measures torque and calculates HP. So to answer you're question: If your car has more HP above 8Krpm will depend upon the torque up there. HP is the amount of work that can be done which is rpm dependent:
HP=torque*rpm/5250
So if your torque above 8K isn't falling like a stone, then you'll have more HP up there.
Incidently, the above equation is the reason all plots should have HP and torque equal to each other at 5250rpm. If they're not the same at 5250rpm, something smells!
Someone please correct me if I have this stuff ba$$-ackwards, I've never used a "real" dyno myself, only "1/4-mile dyno".
HP=torque*rpm/5250
So if your torque above 8K isn't falling like a stone, then you'll have more HP up there.
Incidently, the above equation is the reason all plots should have HP and torque equal to each other at 5250rpm. If they're not the same at 5250rpm, something smells!
Someone please correct me if I have this stuff ba$$-ackwards, I've never used a "real" dyno myself, only "1/4-mile dyno".
11-05-2007, 05:47 AM
#6
you're correct
However, because of the formula, above 5250 rpm, as long as torque falls slower than rpm rises, power will increase.
In this engine, power peaks at 7800 rpm. Somewhere between 7900 rpm and 8000 rpm the ECU cuts the throttle back.
In this engine, power peaks at 7800 rpm. Somewhere between 7900 rpm and 8000 rpm the ECU cuts the throttle back.
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11-05-2007, 07:17 AM
#8
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i'm not so sure about that...my logs show WOT up to 7960, then a gradual drop above 8000.
and I think that drop in throttle position might be the start of lifting to shift to the next gear (or lifting to slow down at the end of the pull). I haven't had the ***** to keep it floored all the way to the rev limiter (on a logged run), and that would be the only way to find out.
11-05-2007, 07:49 AM
#9
Look at a log of throttle valve angle
Here's a run where I kept the petal down until I hit the rev limiter. I've never seen the throttle valve stay open at 8000 rpm and above. Here's what I see:
7600 99.6
7640 99.6
7680 99.6
7680 99.6
7680 99.6
7720 99.6
7720 99.6
7760 99.6
7800 99.6
7840 99.6
7880 99.6
7880 99.6
7880 99.6
7960 99.6
7960 99.6
8000 64.7
8000 58.8
8040 58
8040 56.9
8080 56.1
7600 99.6
7640 99.6
7680 99.6
7680 99.6
7680 99.6
7720 99.6
7720 99.6
7760 99.6
7800 99.6
7840 99.6
7880 99.6
7880 99.6
7880 99.6
7960 99.6
7960 99.6
8000 64.7
8000 58.8
8040 58
8040 56.9
8080 56.1
11-05-2007, 07:59 AM
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that's what I am looking at....yours seems to drop off more quickly, for some reason.
I lifted before hitting the rev limiter on this one:
RPM MAF Throttle valve angle %
7600 151.83 99.6
7640 151.78 99.6
7720 151.22 99.6
7720 153.69 99.6
7800 153.78 99.6
7840 154 99.6
7880 155.61 99.6
7920 156.19 99.6
7960 157.06 99.6
8000 156.36 97.3
8040 157.19 93.7
8080 153.61 62
RPM MAF Throttle valve angle %
7600 151.83 99.6
7640 151.78 99.6
7720 151.22 99.6
7720 153.69 99.6
7800 153.78 99.6
7840 154 99.6
7880 155.61 99.6
7920 156.19 99.6
7960 157.06 99.6
8000 156.36 97.3
8040 157.19 93.7
8080 153.61 62