Excell Cold Air Intake and Exhaust

[Blue Dave]

Here you go Dave.

Thanks!

Wow! With both the airbox & the silencer you pick up 10 hp on top, but the 20 hp midrange increase is what is really impressive! The midrange gains with just the airbox are also impressive.

For those of you with the airbox does your seat of the pants observations back this up?

 

[TD Max]

The best bang for the buck is the muffler no doubt. You get 90%+ of the peak HP gain with just this mod. Double the cost and gain another 1-2 HP. Now the gain at 7000-7500 with the air box is real, but your clutching should flash right through that RPM in just a fraction of a second.

One thing we don't know though is what the dynamics of the chassis in motion may add.

 

[cannondale27]

Here is what I found. Even at 8800 rpm the sled is fun. I am about dead even with my cat7000 buddy who is perfectly clutched and has a mbrp. Will pull some weight to get it to 9100 again in the morning.getting close and now at least it's not banging rev limiter like last weekend. I have noticed she now has enough power coming out of corners to slide back end.

 

[Blue Dave]

Here is what I found. Even at 8800 rpm the sled is fun. I am about dead even with my cat7000 buddy who is perfectly clutched and has a mbrp. Will pull some weight to get it to 9100 again in the morning.getting close and now at least it's not banging rev limiter like last weekend. I have noticed she now has enough power coming out of corners to slide back end.

So this is with just the airbag mod on your sled (stock muffler?).

 

[TD Max]

Here is what I found. Even at 8800 rpm the sled is fun. I am about dead even with my cat7000 buddy who is perfectly clutched and has a mbrp. Will pull some weight to get it to 9100 again in the morning.getting close and now at least it's not banging rev limiter like last weekend. I have noticed she now has enough power coming out of corners to slide back end.

So if I follow

Intake mods, PC-V, can with clutching a couple hundred RPM's low = can with perfect clutching

Do you think that the RPM is that critical, or is this an underacheiver/overacheiver thing?

 

[larrypolaris]

Rode this past week 300 miles with Excell intake and MBRP can.
Definitely made more power than stock.
Sled pulls hard mid-range and top end.
Engine seem happiest 9000 RPM range.
Currently running a 45/39 helix. Tried a 46/40 helix.
Brought the RPM's down to 8800 RPMs. Sled pulled good but didn't feel as snappy when running around 9000 RPMs.
6-1 wrap Hauck silver spring.
Running Hauck VP weights. Base weight 64g.
0 g hole #1
4.4g hole #2
6.2g hole #3

 

[Alsim]

Larry
Do you have pc5 with your set up ?

 

[cannondale27]

I know I am making more power since my clutching now is off had to add weight vs stock. Have not gotten it right yet and am dead even with a MBRP,Clutched cat in a full throttle drag race of about 1000 ft 94-95mph. My mid range is awesome coming into and out of corners it is really noticeable and I can now be confident that if I need to slide the back end around it has the power to do it. Something I was missing since SRX days. Top end sucks. All I can say is ask Excell for clutching because I am not using the hp that is available yet.

 

[cannondale27]

So if I follow

Intake mods, PC-V, can with clutching a couple hundred RPM's low = can with perfect clutching

Do you think that the RPM is that critical, or is this an underacheiver/overacheiver thing?

It is but I hit the rpm clutching and both above and below the rpm. Its MPH that is issue. It is like a sail goes out around 90mph! I am very frustrated TD. I should be mopping him up on top end. I cannot even hit a 100mph and believe me I tried. I should not have to darn near kill myself trying to get the distance needed to get every last mph out of it with this much hp. Its just not safe. I have not contacted Ulmer yet and I have his clutch kit so maybe he can help.

 

[larrypolaris]

Larry
Do you have pc5 with your set up ?

No. Just running Excell intake and MBRP can.
Driveability seems fine. No hickups or hesitations.

Intake air temps were right around 35 deg f at all speeds.
10-20 deg outside air temps.

 

[Blue Dave]

I like the idea of the Excell airbox mod but I don't want to spend that kind of money on it.

Why couldn't a guy fabricate something very similar using PVC pipe or some other type of tubing?

 

[RIGIDONE]

I like the idea of the Excell airbox mod but I don't want to spend that kind of money on it.

Why couldn't a guy fabricate something very similar using PVC pipe or some other type of tubing?

There are also machined aluminum velocity stacks in the air box..It's not just a snorkel..Trust me, a lot of thought and testing went into the design of this product..

 

[Blue Dave]

Ok, Thanks!

It looks like the can is responsible for the majority of the peak HP gain and the airbox mod only adds a small amount of additional HP at peak. I am just not seeing the same "bang for the buck" on the airbox compared to the can.

 

[Studroes144]

I too am kinda surprised in not seeing more of these bolt on modded sleds in the 100+ mph range, not saying setup is bad cuz there's been numerous posts with guys using all different types of clutching and sounds like a lot of them are having trouble even squeaking 100 mph out of a clutched sled with bolt ons. Last year we had 3 different vipers all stock with clutch kits and on snow we would run around 98-100 in 1000', 1/4 mile fastest we ever got was 104 mph with mine. Totally stock just a clutch kit but mine was the only one to do it and I had the softer torsion springs, DuPont slides and extra wheels which all helped, but still I'm curious as to why there isn't more vipers that aren't running over 100 mph with the mods

 

[RIGIDONE]

Remember too guys, there is a ram air effect with the CAI..