consistant dyno numbers, i like it
#1
Senior Member
Thread Starter
Join Date: 04-11-04
Location: patterson, ca
Posts: 2,175
Likes: 0
Received 0 Likes
on
0 Posts
consistant dyno numbers, i like it
shows his previous then he redynoed so they recalibrated the dyno better, and he pulled
http://www.saturnfans.com/forums/sho...threadid=43296
someone can do the pics, i dunno how
http://www.saturnfans.com/forums/sho...threadid=43296
someone can do the pics, i dunno how
#3
Premium Member
Join Date: 04-17-04
Location: Edmonton, AB, Canada
Posts: 771
Likes: 0
Received 0 Likes
on
0 Posts
http://www.cs-servers.com/ion/dyno1.jpg
Nice. I'm really liking the numbers these engines are putting down. Power delivery and torque seem pretty good for a 4 cylinder engine, smooth and not too peaky. Looks as if 3600-3700 RPM is where it really starts to pull.
Notice also that the car is still gaining power at the redline, and the torque drop-off at redline isn't too bad, so even without more tuning a simple chip to increase the redline a few hundred RPM would probably result in some extra power.
Nice. I'm really liking the numbers these engines are putting down. Power delivery and torque seem pretty good for a 4 cylinder engine, smooth and not too peaky. Looks as if 3600-3700 RPM is where it really starts to pull.
Notice also that the car is still gaining power at the redline, and the torque drop-off at redline isn't too bad, so even without more tuning a simple chip to increase the redline a few hundred RPM would probably result in some extra power.
#5
Originally Posted by zstyle
http://www.cs-servers.com/ion/dyno1.jpg
Nice. I'm really liking the numbers these engines are putting down. Power delivery and torque seem pretty good for a 4 cylinder engine, smooth and not too peaky. Looks as if 3600-3700 RPM is where it really starts to pull.
Notice also that the car is still gaining power at the redline, and the torque drop-off at redline isn't too bad, so even without more tuning a simple chip to increase the redline a few hundred RPM would probably result in some extra power.
Nice. I'm really liking the numbers these engines are putting down. Power delivery and torque seem pretty good for a 4 cylinder engine, smooth and not too peaky. Looks as if 3600-3700 RPM is where it really starts to pull.
Notice also that the car is still gaining power at the redline, and the torque drop-off at redline isn't too bad, so even without more tuning a simple chip to increase the redline a few hundred RPM would probably result in some extra power.
Maybe GM will refine this with the Cobalt. I hope so. That means that I can have them do it to my Redline too. :mrgreen:
#9
he said it was recalibrated, no mods.
although simply removing the airbox and strapping on the K&N filter nets around 9 hp, which is nice, probobly more on the road as you're getting cooler air when the car is in motion
although simply removing the airbox and strapping on the K&N filter nets around 9 hp, which is nice, probobly more on the road as you're getting cooler air when the car is in motion
#13
Did anyone notice that the dyno graph posted here isn't quite right? Maybe, it's just me looking at it funny, but all dyno graphs HP & Torque figures should cross at 5250...this one crosses at somewhere around 5800.
Correct me if I'm wrong on this one.
Correct me if I'm wrong on this one.
#14
Senior Member
Join Date: 03-16-05
Location: Rochester, NY
Posts: 2,335
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Yaj
Did anyone notice that the dyno graph posted here isn't quite right? Maybe, it's just me looking at it funny, but all dyno graphs HP & Torque figures should cross at 5250...this one crosses at somewhere around 5800.
Correct me if I'm wrong on this one.
Correct me if I'm wrong on this one.
#15
Originally Posted by tiny
no, that depends on the car
What do you mean? HP is HP and Torque is Torque...doesn't matter what kind of car it is. Dynos measure torque at the wheels and convert it to HP...the formula is to multiply torque by rpm/5250. Because of this, any valid dyno graph will always have HP & torque cross at 5250. The HP & torque figure maybe 50 or 550, but at 5250 RPM they should be equal.
#16
Moderator Alumni
Originally Posted by Yaj
What do you mean? HP is HP and Torque is Torque...doesn't matter what kind of car it is. Dynos measure torque at the wheels and convert it to HP...the formula is to multiply torque by rpm/5250. Because of this, any valid dyno graph will always have HP & torque cross at 5250. The HP & torque figure maybe 50 or 550, but at 5250 RPM they should be equal.
What the question is about is where the HP and TQ curves cross. It had to do with the power band of the engine ect. I know just enough to know thats what the question is about.
#17
Senior Member
Join Date: 04-17-04
Location: Calgary Alberta Canada
Posts: 2,994
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Yaj
Did anyone notice that the dyno graph posted here isn't quite right? Maybe, it's just me looking at it funny, but all dyno graphs HP & Torque figures should cross at 5250...this one crosses at somewhere around 5800.
Correct me if I'm wrong on this one.
Correct me if I'm wrong on this one.
that is werid.... I have always heard the 5252- rpm thing too
#18
Originally Posted by zinner
Actually horsepower is torque applied over distance/time.
What the question is about is where the HP and TQ curves cross. It had to do with the power band of the engine ect. I know just enough to know thats what the question is about.
What the question is about is where the HP and TQ curves cross. It had to do with the power band of the engine ect. I know just enough to know thats what the question is about.
Look at the AEM intake thread elsewhere in this forum. Although the HP & TQ graphs are seperate, you'll see at 5252 they are close...and if you could overlay the graphs I'm betting they would cross at 5252 rpm.
Hope I'm not stepping on anyone's toes here...just looking for an explaination.
#19
http://www.revsearch.com/dynamometer...orsepower.html
some math behind it...
being the chart shows SAE and not metric then the numbers should cross earlier if they are scaled the same
some math behind it...
being the chart shows SAE and not metric then the numbers should cross earlier if they are scaled the same
#20
Originally Posted by newcomer81
http://www.revsearch.com/dynamometer...orsepower.html
some math behind it...
being the chart shows SAE and not metric then the numbers should cross earlier if they are scaled the same
some math behind it...
being the chart shows SAE and not metric then the numbers should cross earlier if they are scaled the same
Here's an interesting bit of trivia; below 5252 rpm any engine's torque number will always be higher than its horsepower number, and above 5252 rpm any engine's horsepower number will always be higher than its torque number. At 5252 rpm the horsepower and torque numbers will be exactly the same.
Why should it matter if it's SAE or Metric...I don't understand that part, but then again all the math on the site is giving me a headache At least I know that my thinking was on the right track and that 5252 is a constant involving changing rpm to time/distance.
#22
Power = Torque * RPM / 5252
ALWAYS. That does NOT change from car to car.
Look more carefully at the graph. The torque curve is on a secondary axis on the right side of the graph. If you follow it out, on the blue curve, at 5252 RPM, the horsepower and torque numbers are exactly equal. About 187hp/lbft.
I can write out the math for you, if you like!
ALWAYS. That does NOT change from car to car.
Look more carefully at the graph. The torque curve is on a secondary axis on the right side of the graph. If you follow it out, on the blue curve, at 5252 RPM, the horsepower and torque numbers are exactly equal. About 187hp/lbft.
I can write out the math for you, if you like!
#23
Originally Posted by DanM
Power = Torque * RPM / 5252
ALWAYS. That does NOT change from car to car.
Look more carefully at the graph. The torque curve is on a secondary axis on the right side of the graph. If you follow it out, on the blue curve, at 5252 RPM, the horsepower and torque numbers are exactly equal. About 187hp/lbft.
I can write out the math for you, if you like!
ALWAYS. That does NOT change from car to car.
Look more carefully at the graph. The torque curve is on a secondary axis on the right side of the graph. If you follow it out, on the blue curve, at 5252 RPM, the horsepower and torque numbers are exactly equal. About 187hp/lbft.
I can write out the math for you, if you like!
Thanks DanM...I see where I made my mistake now.
#24
Originally Posted by DanM
Power = Torque * RPM / 5252
ALWAYS. That does NOT change from car to car.
Look more carefully at the graph. The torque curve is on a secondary axis on the right side of the graph. If you follow it out, on the blue curve, at 5252 RPM, the horsepower and torque numbers are exactly equal. About 187hp/lbft.
I can write out the math for you, if you like!
ALWAYS. That does NOT change from car to car.
Look more carefully at the graph. The torque curve is on a secondary axis on the right side of the graph. If you follow it out, on the blue curve, at 5252 RPM, the horsepower and torque numbers are exactly equal. About 187hp/lbft.
I can write out the math for you, if you like!
I may not be looking at the graph correctly.. but both runs seem to cross at 5.9K RPMs?
#25
Moderator Alumni
Originally Posted by newcomer81
I may not be looking at the graph correctly.. but both runs seem to cross at 5.9K RPMs?
At 5252 RPM both the HP and TQ are ~180 . Since the scales are different tho the lines doesn't actually cross at that point.