Air box mod

Was very happy to talk to Terry and company tonight from the track. I will let him explain but I am very pleased with this air box mod. As there are now other air box mods floating around may we call this one "Bill's air box mod" please?
 
stingray719 said:
Was very happy to talk to Terry and company tonight from the track. I will let him explain but I am very pleased with this air box mod. As there are now other air box mods floating around may we call this one "Bill's air box mod" please?
Click to expand...

Well I told Terry, that I was not convinced that it would improve his time, I think it was one of his better runs. Well after multiple testing of the clutch, we finally got it dialed in. And Terry then tried the air box mod, and it worked! It was really cool! I think he ran it twice and both times were better, and the best run he had run. I'll let him say the times. But Good stuff Bill!!
 
Very good stuff! :)

I had my doubts when Shagman came to my house 2 Fridays ago and I made 2 passes down the road. The sled wouldn't pull rpm but felt faster.

This past Friday, after doing a lot of clutch changes, putting "Bill's air box Mod" the best run was 11.3872 @ 107.82mph :)

Thank you Bill :)
 
NOS-PRO said:
Very good stuff! :)

I had my doubts when Shagman came to my house 2 Fridays ago and I made 2 passes down the road. The sled wouldn't pull rpm but felt faster.

This past Friday, after doing a lot of clutch changes, putting "Bill's air box Mod" the best run was 11.3872 @ 107.82mph :)

Thank you Bill :)
Click to expand...


Would you be willing to post what you finally ended up with for clutching?
 
NOS-PRO said:
Very good stuff! :)

I had my doubts when Shagman came to my house 2 Fridays ago and I made 2 passes down the road. The sled wouldn't pull rpm but felt faster.

This past Friday, after doing a lot of clutch changes, putting "Bill's air box Mod" the best run was 11.3872 @ 107.82mph :)

Thank you Bill :)
Click to expand...


Gave me great pleasure to help you go faster.
 
RTX said:
Would you be willing to post what you finally ended up with for clutching?
Click to expand...

Stingray is correct, my final setup on snow this past winter hit the rev limiter all the way down the track for asphalt. My last setup for snow was spot on. This is a totally different animal on asphalt. I will be trying these weights I'm using now in winter to see if I can get it faster than before.
 
OK back to the air box mod. Not trying to be the eternal skeptic, but I have a need to understand what is happening.

"Would not pull RPM but felt faster"

Something made the sled faster but with less RPM as I understand

It proved to be faster yes, but why? More HP should have pulled more RPM correct?

Were there gains made somewhere else in the curve? IE not at peak rpm but at the launch.

Less power connecting through the clutches better?

There was talk of a 30mph headwind on previous runs. What were the conditions this time?

Could the air box mod be pushing to a borderline lean condition?
 
TD Max said:
OK back to the air box mod. Not trying to be the eternal skeptic, but I have a need to understand what is happening.

"Would not pull RPM but felt faster"

Something made the sled faster but with less RPM as I understand

It proved to be faster yes, but why? More HP should have pulled more RPM correct?

Were there gains made somewhere else in the curve? IE not at peak rpm but at the launch.

Less power connecting through the clutches better?

There was talk of a 30mph headwind on previous runs. What were the conditions this time?

Could the air box mod be pushing to a borderline lean condition?
Click to expand...

X2....
 
TD Max said:
OK back to the air box mod. Not trying to be the eternal skeptic, but I have a need to understand what is happening.

"Would not pull RPM but felt faster"

Something made the sled faster but with less RPM as I understand

It proved to be faster yes, but why? More HP should have pulled more RPM correct?

Were there gains made somewhere else in the curve? IE not at peak rpm but at the launch.

Less power connecting through the clutches better?

There was talk of a 30mph headwind on previous runs. What were the conditions this time?

Could the air box mod be pushing to a borderline lean condition?
Click to expand...

TD - On the road by my house (witnessed by Shagman) the sled left stripes all the way down the road which causes me to think the clutches were shifting too soon lowering rpms because the track wasn't hooking up. At the track, Saturday after the races....shagman, my son and I walked the whole track. After the 60 ft, the track wanted to pull our shoes off. It felt faster maybe because I didn't have all my gear on....just being truthful. But when a sled can lay long marks on a fairly new blacktop road.....it felt like it had plenty of power, just wouldn't climb to the rpm I was running on the track.

More RPM seems to show more Hp with the Viper, not like the APex where I had mine clutched for 10,200 and would walk all over other sleds revving at 11,000. The Viper is a different animal and needs the RPM. That's why the huge difference in times.

There was a wind, but not like the 30 mph headwind the previous week before. But, very humid and was hot. Everyone was running .3 slower than usual. Pro116 even admitted the times were slow.

Now, the lean condition is a probability as I didn't check plugs at all. It could be and I will be looking into the cyclinders for any kind of detonation. I don't want to hurt this engine. It may be safe for the warm weather (I think anyway) but may hurt the sled in cold temps.

Hope this answers your questions
 
I would like to add that I wouldn't want anyone else to hurt there engine either. Getting this sled faster is becoming a joy of mine especially when it is only 127-130 horse and running low 11's....soon to be 10's :)

Wish you could have come down to the track TD.... It was like a chinese fire drill under my blue canopy :)

Still more testing to do and didn't have time to put the stock can back on for ya. I'm hoping to do it soon again.
 
Once you get past the back to back can runs comes the back to back air box top runs ;-)

Assuming this is a somewhat simple swap of course.

Could running on the road and "hazing" the track be the equivalent of running in loose versus tight snow conditions? A more aggressive shift up as you theorized.

So do you feel that you need more track (width) for more surface area, or less track for more psi to get the sled to hook up?
 
NOS-PRO said:
TD - On the road by my house (witnessed by Shagman) the sled left stripes all the way down the road which causes me to think the clutches were shifting too soon lowering rpms because the track wasn't hooking up. At the track, Saturday after the races....shagman, my son and I walked the whole track. After the 60 ft, the track wanted to pull our shoes off. It felt faster maybe because I didn't have all my gear on....just being truthful. But when a sled can lay long marks on a fairly new blacktop road.....it felt like it had plenty of power, just wouldn't climb to the rpm I was running on the track.

More RPM seems to show more Hp with the Viper, not like the APex where I had mine clutched for 10,200 and would walk all over other sleds revving at 11,000. The Viper is a different animal and needs the RPM. That's why the huge difference in times.

There was a wind, but not like the 30 mph headwind the previous week before. But, very humid and was hot. Everyone was running .3 slower than usual. Pro116 even admitted the times were slow.

Now, the lean condition is a probability as I didn't check plugs at all. It could be and I will be looking into the cyclinders for any kind of detonation. I don't want to hurt this engine. It may be safe for the warm weather (I think anyway) but may hurt the sled in cold temps.

Hope this answers your questions
Click to expand...

Some things to note. We did see a increase in the RPM's at the track when we put the airbox on. If i remember correctly we changed to a steeper helix for both takeoff and end of run after putting on airbox to correct for the gains. we ran 2 passes after that which were very close to each other (fastest of the night). As far a being lean, i dont think it is. If it was lean I don't think we would have seen the increase in RPM's (past 4 stoke experience). The only way to know for sure would be an AFR gauge. Hope this helps.
 
When D&D did their airbox mods they used their barker can and had an afr gauge setup just to check if it was pulling safe numbers or not..they weren't safe, they wouldn't recommend the airbox mods with any type of exhaust without a pcv or something to accommodate for more fuel. Once they installed pcv if I remember right they were like 145hp maybe a whisker more so def good power to be made if done right and if you're willing to spend the extra money on a fuel controller to add more fuel
 
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