question about this dyno sheet dip on an LS
01-31-2008, 01:46 PM
#1
3.0 BAR
Thread Starter
Join Date: Jan 2003
Posts: 1,798
question about this dyno sheet dip on an LS
this image is from http://www.honda-tech.com/zerothread?id=1765855&page=1 .
Why does he have a large dip in the graph at 4000-5000 rpm ? I want to copy his setup, but I really dislike that torque dip...
If I'm street wideband tuning will I be able to see that dip? I figured I'll graph Time vs RPM which should show me dips, but I dont know that will actually work.
Thanks
Nick
01-31-2008, 02:02 PM
#2
0.0 BAR
Join Date: Jun 2005
Location: WA
Posts: 0
Re: question about this dyno sheet dip on an LS
It looks like it's in the engine itself. If you look at the dyno on the 2nd page, he gets rid of that torque dip with the crower cams.
I'm not sure if his tune is good or not, but I'm sure it could be cleaned up by messing with the timing and getting it all squared out on the dyno.
In all honesty, that doesn't look like a good tune. The torque curve shouldn't be so wavey like that.
I'm not sure if his tune is good or not, but I'm sure it could be cleaned up by messing with the timing and getting it all squared out on the dyno.
In all honesty, that doesn't look like a good tune. The torque curve shouldn't be so wavey like that.
01-31-2008, 02:06 PM
#3
3.0 BAR
Thread Starter
Join Date: Jan 2003
Posts: 1,798
Re: question about this dyno sheet dip on an LS
Originally Posted by d112crzy
It looks like it's in the engine itself. If you look at the dyno on the 2nd page, he gets rid of that torque dip with the crower cams.
I'm not sure if his tune is good or not, but I'm sure it could be cleaned up by messing with the timing and getting it all squared out on the dyno.
In all honesty, that doesn't look like a good tune. The torque curve shouldn't be so wavey like that.
I'm not sure if his tune is good or not, but I'm sure it could be cleaned up by messing with the timing and getting it all squared out on the dyno.
In all honesty, that doesn't look like a good tune. The torque curve shouldn't be so wavey like that.
01-31-2008, 02:21 PM
#5
0.0 BAR
Join Date: Jun 2005
Location: WA
Posts: 0
Re: question about this dyno sheet dip on an LS
This is a different dyno graph you tard. It separates the two curves. Tons of dyno's do this.
Sinner, I don't think that dip is such a huge deal. It only seems so big because most of the dyno graphs are inremented by 5hp on the y-axis. If you take a look at the new engine vs old engine graph, the increments are 10hp and the dips don't seem as extreme.
But I still say that it can be smoothed out with some tuning.
Sinner, I don't think that dip is such a huge deal. It only seems so big because most of the dyno graphs are inremented by 5hp on the y-axis. If you take a look at the new engine vs old engine graph, the increments are 10hp and the dips don't seem as extreme.
But I still say that it can be smoothed out with some tuning.
01-31-2008, 02:59 PM
#6
3.0 BAR
Join Date: Jun 2005
Posts: 1,623
Re: question about this dyno sheet dip on an LS
still not a legitimate dyno graph end of story
and for a proclaimed tuner that scams people your sure dumb
Originally Posted by d112crzy
This is a different dyno graph you tard. It separates the two curves. Tons of dyno's do this.
Sinner, I don't think that dip is such a huge deal. It only seems so big because most of the dyno graphs are inremented by 5hp on the y-axis. If you take a look at the new engine vs old engine graph, the increments are 10hp and the dips don't seem as extreme.
But I still say that it can be smoothed out with some tuning.
Sinner, I don't think that dip is such a huge deal. It only seems so big because most of the dyno graphs are inremented by 5hp on the y-axis. If you take a look at the new engine vs old engine graph, the increments are 10hp and the dips don't seem as extreme.
But I still say that it can be smoothed out with some tuning.
01-31-2008, 03:02 PM
#7
0.0 BAR
Join Date: Jun 2005
Location: WA
Posts: 0
Re: question about this dyno sheet dip on an LS
Originally Posted by gen4acclude
still not a legitimate dyno graph end of storyand for a proclaimed tuner that scams people your sure dumb
Prove I scammed anyone. I dare you. You're a just a dumbass that doesn't know the meaning of communication.
01-31-2008, 03:10 PM
#8
3.0 BAR
Join Date: Dec 2004
Posts: 1,976
Re: question about this dyno sheet dip on an LS
Originally Posted by gen4acclude
still not a legitimate dyno graph end of storyand for a proclaimed tuner that scams people your sure dumb
hp = tq X rpm / 5252
gee, lets take the max tq of 141.8 X 4262 = 604351.6
now 605351.6 / 5252 = 115.0707#####
now look at 4262rpm on the HP side of that graph, sure the ---- looks like 115hp to me
if the graphs were laid on top of each other like a typical dyno graph, it would cross like its supposed to
01-31-2008, 03:44 PM
#9
3.0 BAR
Join Date: Jun 2005
Posts: 1,623
Re: question about this dyno sheet dip on an LS
Originally Posted by ryan89crx
you dont know what you are talking about. hp is a mathematical equation derived from the tq curve
hp = tq X rpm / 5252
gee, lets take the max tq of 141.8 X 4262 = 604351.6
now 605351.6 / 5252 = 115.0707#####
now look at 4262rpm on the HP side of that graph, sure the ---- looks like 115hp to me
if the graphs were laid on top of each other like a typical dyno graph, it would cross like its supposed to
hp = tq X rpm / 5252
gee, lets take the max tq of 141.8 X 4262 = 604351.6
now 605351.6 / 5252 = 115.0707#####
now look at 4262rpm on the HP side of that graph, sure the ---- looks like 115hp to me
if the graphs were laid on top of each other like a typical dyno graph, it would cross like its supposed to
