Help interpreting dyno results
Thread Starter
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Club Member
Joined: Mar 2006
Posts: 18,303
Likes: 26,540
From: Northwest of Los Angeles
Only 4 passes between the before/after runs.
Not much tuning could have possibly been done. You likely have some ponies left on the table. And don't expect miracles in the lower ranges.
My bike was tuned in several different RPM ranges and in different gears.
Timing as well as AFR. Each cylinder done separately.
The tuner tried to recreate several different riding scenarios.
It took 67 passes to accomplish this. The bike rides like a dream.
Not much he could have done in 4 passes. I hope he didn't charge you much.
Not much tuning could have possibly been done. You likely have some ponies left on the table. And don't expect miracles in the lower ranges.
My bike was tuned in several different RPM ranges and in different gears.
Timing as well as AFR. Each cylinder done separately.
The tuner tried to recreate several different riding scenarios.
It took 67 passes to accomplish this. The bike rides like a dream.
Not much he could have done in 4 passes. I hope he didn't charge you much.
Thread Starter
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Club Member
Joined: Mar 2006
Posts: 18,303
Likes: 26,540
From: Northwest of Los Angeles
Thanks for your opinion, but it would be more helpful if you could elaborate a little. In what way do you think that the AFR is out of whack? Why do you think that would affect the hp and tq readings?
Road Captain
Joined: Dec 2009
Posts: 646
Likes: 1
From: Rockford, IL
The afr line should be flat....your bike is MASSIVELY lean at lower rpms. Here's my dyno sheet....it's going to be richer than yours(due to the supercharger)but notice how the afr line is flat
Thread Starter
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Club Member
Joined: Mar 2006
Posts: 18,303
Likes: 26,540
From: Northwest of Los Angeles
Thanks, that helps a lot. I guess I really do need to get it to a good tuner.
HDF Community Team
Joined: Jun 2006
Posts: 12,776
Likes: 2,607
From: san antonio
Four passes is just enough to get the engine warm and ready to tune; your engine has not been tuned. It takes anywhere from 30 to sixty pulls to properly tune a twin cam. Someoen else has pointed out the anomolies in the AFR line which should be generally flat across the rpm range.
You need to find a real tuner.
You need to find a real tuner.
Banned
Joined: Sep 2009
Posts: 7,580
Likes: 7
From: The Internet (& Dyer, Indiana)
Yeah, you paid for some dyno pulls, not tune. Actually, that is good news.
Tuning will help that bike and that's what you came here to find out.
There is more performace waiting for you just by tuning it. You might even find a canned map that is closer, but I wouldn't pay for another dyno pull to find out if a new map worked. Better off spending towards a custom tune.
Find somebody with a reputation, that is willing to adjust timing as well as AFR. You won't regret it.
Massively rich.
Your AFR line ain't so flat. The chart is squished narrow, so it turns out looking flat (not intentionally). If you loaded your file into Winpep 7 and made your graph bigger, you'd see the curves.
But the good news is: They aren't supposed to be perfect flat. Different rpm ranges demand different stuff (for peak performance). A perfect flat line would leave you weak in some areas. Amatuer tuners shoot for the perfect straight afr line. They end up with dips in the torque curve because of that.
But the OP's line is indeed way off. But he didn't pay for a tune. He's just researching what to do.
I have seen dyno guys squish the HP/TQ chart to make those lines look flatter (not gonna mention any names - they know who they are).
"Oh look, I have a beautiful flat torque curve". LOL
Speaking of the OP's AFR,....... He is way rich between 2500 and 3500 rpm. I can't believe his plugs ain't fowling and he's gotta have horrible fuel mileage. Need to take away some fuel from that range asap. (That's where we spend much of our time at). He likely will notice a difference in performance right away. He can do that himself with the pushbuttons on the unit (if they still have them) or with his home computer.
Tuning will help that bike and that's what you came here to find out.
There is more performace waiting for you just by tuning it. You might even find a canned map that is closer, but I wouldn't pay for another dyno pull to find out if a new map worked. Better off spending towards a custom tune.
Find somebody with a reputation, that is willing to adjust timing as well as AFR. You won't regret it.
The afr line should be flat....your bike is MASSIVELY lean at lower rpms. Here's my dyno sheet....it's going to be richer than yours(due to the supercharger)but notice how the afr line is flat
Your AFR line ain't so flat. The chart is squished narrow, so it turns out looking flat (not intentionally). If you loaded your file into Winpep 7 and made your graph bigger, you'd see the curves.
But the good news is: They aren't supposed to be perfect flat. Different rpm ranges demand different stuff (for peak performance). A perfect flat line would leave you weak in some areas. Amatuer tuners shoot for the perfect straight afr line. They end up with dips in the torque curve because of that.
But the OP's line is indeed way off. But he didn't pay for a tune. He's just researching what to do.
I have seen dyno guys squish the HP/TQ chart to make those lines look flatter (not gonna mention any names - they know who they are).
"Oh look, I have a beautiful flat torque curve". LOL
Speaking of the OP's AFR,....... He is way rich between 2500 and 3500 rpm. I can't believe his plugs ain't fowling and he's gotta have horrible fuel mileage. Need to take away some fuel from that range asap. (That's where we spend much of our time at). He likely will notice a difference in performance right away. He can do that himself with the pushbuttons on the unit (if they still have them) or with his home computer.
Road Captain
Joined: Dec 2009
Posts: 646
Likes: 1
From: Rockford, IL
Yeah, you paid for some dyno pulls, not tune. Actually, that is good news.
Tuning will help that bike and that's what you came here to find out.
There is more performace waiting for you just by tuning it. You might even find a canned map that is closer, but I wouldn't pay for another dyno pull to find out if a new map worked. Better off spending towards a custom tune.
Find somebody with a reputation, that is willing to adjust timing as well as AFR. You won't regret it.
Massively rich.
Your AFR line ain't so flat. The chart is squished narrow, so it turns out looking flat (not intentionally). If you loaded your file into Winpep 7 and made your graph bigger, you'd see the curves.
But the good news is: They aren't supposed to be perfect flat. Different rpm ranges demand different stuff (for peak performance). A perfect flat line would leave you weak in some areas. Amatuer tuners shoot for the perfect straight afr line. They end up with dips in the torque curve because of that.
But the OP's line is indeed way off. But he didn't pay for a tune. He's just researching what to do.
I have seen dyno guys squish the HP/TQ chart to make those lines look flatter (not gonna mention any names - they know who they are).
"Oh look, I have a beautiful flat torque curve". LOL
Speaking of the OP's AFR,....... He is way rich between 2500 and 3500 rpm. I can't believe his plugs ain't fowling and he's gotta have horrible fuel mileage. Need to take away some fuel from that range asap. (That's where we spend much of our time at). He likely will notice a difference in performance right away. He can do that himself with the pushbuttons on the unit (if they still have them) or with his home computer.
Tuning will help that bike and that's what you came here to find out.
There is more performace waiting for you just by tuning it. You might even find a canned map that is closer, but I wouldn't pay for another dyno pull to find out if a new map worked. Better off spending towards a custom tune.
Find somebody with a reputation, that is willing to adjust timing as well as AFR. You won't regret it.
Massively rich.
Your AFR line ain't so flat. The chart is squished narrow, so it turns out looking flat (not intentionally). If you loaded your file into Winpep 7 and made your graph bigger, you'd see the curves.
But the good news is: They aren't supposed to be perfect flat. Different rpm ranges demand different stuff (for peak performance). A perfect flat line would leave you weak in some areas. Amatuer tuners shoot for the perfect straight afr line. They end up with dips in the torque curve because of that.
But the OP's line is indeed way off. But he didn't pay for a tune. He's just researching what to do.
I have seen dyno guys squish the HP/TQ chart to make those lines look flatter (not gonna mention any names - they know who they are).
"Oh look, I have a beautiful flat torque curve". LOL
Speaking of the OP's AFR,....... He is way rich between 2500 and 3500 rpm. I can't believe his plugs ain't fowling and he's gotta have horrible fuel mileage. Need to take away some fuel from that range asap. (That's where we spend much of our time at). He likely will notice a difference in performance right away. He can do that himself with the pushbuttons on the unit (if they still have them) or with his home computer.
oops...I meant massively Rich..I think I was looking lower in the rpm band, roughly 2k-2200.
The only reason it dips slightly richer toward redline is because I'm running towards the limit of the injectors....
I think Jaime at Fuel moto did an EXCELLENT job tuning my bike...runs like a raped ape!
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Banned
Joined: Sep 2009
Posts: 7,580
Likes: 7
From: The Internet (& Dyer, Indiana)
oops...I meant massively Rich..I think I was looking lower in the rpm band, roughly 2k-2200.
The only reason it dips slightly richer toward redline is because I'm running towards the limit of the injectors....
I think Jaime at Fuel moto did an EXCELLENT job tuning my bike...runs like a raped ape!
The only reason it dips slightly richer toward redline is because I'm running towards the limit of the injectors....
I think Jaime at Fuel moto did an EXCELLENT job tuning my bike...runs like a raped ape!
