Apex and Attak Stealth MOD Air Box

[GotJuice]

clarification

Allen, I'm not trying be rude but some of the bolt on H.P. numbers don't line up? A pipe is 3h.p., an air box mod is 3 H.P. plugs are 3 h.p., ignition and power commander are 5-6 h.p. so I'm looking at right around 15 H.p. right ? So I should dyno out at 165h.p. for all the added mods on 91 octane right?, if that's the case then I'd gladly pay the price for the entire package! Like I said I 'm not trying to be rude just wanting clarification as I'm sure you've dyno'd all these on a sled with an Excell pipe and know exactly what can be squeezed out.

 

[08NitroRTX]

GotJuice, I'm new to these Yamaha four stroke sleds and definently NOT trying to answer for Allen (Allen If the general public isn't to reply to post in your section Sorry and please deleat this)
But having moded almost every motorized vehicles I have ever owned over the years, (lots! lol) I have first hand experence that mods on top of mods, on top of mods, does NOT mean you can just add the advertised additional HP straight across from each mod! There are several reasons for this. One needs to take in affect at what RPM does each mod make it peak HP increase. (ex. if one mod make an additional 3 hp at low end, and one gives 3 hp @ mid range RPM and one more gives 3 more hp but at high RPM over all the engine would NOT be making 9 more HP. Because those gains may not actually over lap in the power curve) Yes each of those very well may give 3 hp seperatly but not 9 totaled together. Please don't take my crude example as implying that gains for each improvement (mod) are not accurate or true. Its just they don't always complement each other 100% across the RPM range.
Again Allen PLEASE remove this post if it was out of line as that was NOT my intention here! Or PM me and I'll gladly edit it out. I have a lot to learn before the season begins but somethings carry over from other motor sports!

 

[Srxspec]

We have not tested an exhaust on the dyno with the other combinations, we have only feild tested the setups with an Excell exhaust. I would rather quote HP slightly lower than tested and have a customer more happy with performance than claim a high number and have a customer disappointed!

Stock
6,500 - 86.2 hp
7,000 - 97.2 hp
7,500 - 103 hp
8,000 - 118 hp
8,500 - 126.9 hp
9,000 - 140.2 hp
9,500 - 143.4 hp
10,000 - 147.9 hp
10,500 - 150.9 hp
11,000 - 148 hp

Stock + CR10EK Plugs
6,500 - 88.2 hp
7,000 - 99.7 hp
7,500 - 104.3 hp
8,000 - 118 hp
8,500 - 127.2 hp
9,000 - 143.4 hp
9,500 - 145.1 hp
10,000 - 147.9 hp
10,500 - 153.1 hp
11,000 - 150.4 hp

Stock + CR10EK Plugs + MOD Air Box
6,500 - 89.7 hp
7,000 - 102.2 hp
7,500 - 105.4 hp
8,000 - 118.4 hp
8,500 - 128.8 hp
9,000 - 138.8 hp
9,500 - 146.3 hp
10,000 - 151.9 hp
10,500 - 156.2 hp
11,000 - 152.7 hp

Stock + CR10EK Plugs + MOD Air Box + PCIII + Ignition Module
6,500 - 94.4 hp
7,000 - 110.4 hp
7,500 - 109.4 hp
8,000 - 122.8 hp
8,500 - 134.1 hp
9,000 - 143.6 hp
9,500 - 148.1 hp
10,000 - 154.6 hp
10,500 - 159.9 hp
11,000 - 160.1 hp

 

[Shootinstick]

Allen,

These are interesting numbers. Can you tell us what fuel these were ran with? Are they all 87 octane or is the last one with 91 octane? Can we get more from the last one with fuel change? Is the ignition module responsible for the big boost at 11,000 RPM?

Jim

 

[Srxspec]

All dyno runs were with 87 octane except final dyno run posted above (Stock + CR10EK Plugs + MOD Air Box + PCIII + Ignition Module) which was 91 octane fuel. The ignition module allows the ability to advance or retard timing up to 10 degrees and allows us to maintain timing to the rev limiter (or move rev limiter higher).

 

[adeboisbriand]

stock, is that with the 23 top gear tooth? would the windage plate added raise those hp numbers in the top end?

 

[Srxspec]

The dyno numbers posted are from the crank, not from the track.

 

[GotJuice]

Thank you for your confirmation

Allen, thank you for your confirmation and not being defensive, much appreciated! Is there any way your going to run this set up with the pipe also to confirm it increases on top of the current gains? I'm sure a package with a pipe adding a dyno proven 12 to 15 h.p. would be a big seller, especially for all the trail riders wanting just a tad more and not wanting to go boost. How much weight have you had to add to the primary to compensate for the 160 h.p. ? OH one more question, if the rev limiter is increased to 11500 does the h.p. also increase with the last package advancing the ignition, this is why the R1 makes more power, high RPM's and cams to match?
Now I know the real high RPMS aren't an option but to be able to increase the RPMS safely to 11500 adding another 2 h.p. or another 5 h.p. "with a pipe and increased RPMS" for a total package at 15 h.p......that's what I'm looking for! again thanks for your info!

 

[Srxspec]

Right now time is the limiting factor. With the new FX Nytro there is alot of R&D and testing going on with that. If time permits we will test with an aftermarket exhaust on the dyno. Raising the rev limiter hasn't raised the power, it has just given a very wide powerband to work with. It is possible that with some porting & cam work it will show bigger gains (something we do plan to work with this winter).

 

[trailnazi]

Recently as the powder has gotten deeper i have been experiencing a problem with powder plugging the air box and causing a code 20. do you think this Air Box Mod will help with the problem, or was it more for trail and lake riding. Also, has anyone tried your air box mod in conjuntion with either a Hauck or Fix PS Ram air kit.Could to much air be bad??

 

[900cfi]

Allen with the cr10ek spark plugs,mod airbox and windage plates how much more mph does a guy expect to see.Also can a guy buy the complete airbox with your mod done to it so I can keep my stock box.Thanks

 

[Srxspec]

I do not have a place to run true top end mph, so I will not claim any certain number of mph gain. Also conditions will dictate or effect top end mph greatly from day to day as well. I do have complete air boxes in stock that can be bought out right. They are $250.

 

[niko]

ok so his my question, if im changing the air box adding a pc3 , plugs and a aftermarket exhaust do i need to change my clutching??

niko.