I called scott at sparks racing today because I had seen on their website that they were going to start to ship the full exhaust tomorrow.....He said that the shipping would probably be bumped to mid next week for the first production run, which I am lucky enough to be on because the first five production runs are sold out....so it looks like I'll be ripping around soon....the only things though is that the airbox mods that their making won't be ready for 2 or 3 more weeks....so should I put the pipe on and rejet now and rejet again when I do the new airbox and filter or what ...gonna be a pain to do that ...rather do it all at once but not gonna happen unless I wait to put the pipe on with the box mods.....I don't think I'll have the willpower to wait.....its been a long wait already, I'm ready to unrestrict this thing on somebody....anyway just a little info for anybody getting a sparks pipe...oh also you can see the new airbox pictures at sparks racing.com....pretty sweet but damn thats to much money for that but if its gonna make it faster then theirs that willpower thing again....the wife's gonna be pissed....Merry Christmas to me Later Jon

 

Hey, what kind of numbers are Sparks saying with airbox, filter, exhaust system and jetting to match? Haven't had a chance to call, but based on their website, they seem to be seeing the big picture about Raptor performance parts. I'm debating Big Gun, Sparks ensemble, or a Yoshi exhaust. Gimme some info, please; biggest bang for the buck? Where do ya go from there?

 

Wideopen, I would put the pipe on so you can see how much of a differance there is with just the pipe, then I would put the filter system on and see how much more of a gain you get ( if anything noticable )I find all the companies talk everything up so hopefully we'll see soon, so let us know the truth once you get the exhaust on and then when you get the filter. I will be letting everyone know about my raptor when I get it back from TC Racing I found out he tore it down and at least he was honest with me and said that the stock cam, piston and even air box are good for harescramble and woods riding. I was told for the woods since the raptor is geared so high from the factory that you need tourqe to pull 2nd and 3rd gears through the woods, for motocross cam, piston and air box will help but actually with the air box mod you loose low end tourqe but will gain mid and top end hp. Who knows we'll see so let us know the truth and so will I as soon as I get the quad back it was supose to be done 2 weeks ago.

 

Xtreme165, I'd be griping if I were you. Didn't you give it to them A LONG time ago, I would have that itch that wouldn't stop until I rode my RAPTOR!!! Hey but if it's free you can't complain....

 

Ya I am going nuts but its not Free either so that makes it more frustraiting it would of been different if I would of been told it would take this long but I was told 2-3 weeks by the end of november. Hopefully soon!

 

Wasn't it you that gave their raptor to a racing shop and they said that they'd make a pipe for it for free.

 

No I wish it was for free, I do remember someone gave there raptor to LRD and they are doing it for free I wouldnt mind the wait if it was for free.

 

xtreme165, Why do you lose low end torque with an air box mod?

"...for motocross cam, piston and air box will help but actually with the air box mod you loose low end tourqe but will gain mid and top end hp."

 

the reason you lose lowend torque and power with an air box mod is that intake vacum is lost with a better breathing carberator. remember intake vacum=lowend less intake vacum is for better top end.

MT Racing

01 Raptor
85 LT250R
96 Warrior

 

I hate to be argumentative, but that statement is wrong. Vacuum is caused by your engine demanding more air than the least restrictive part of the intake system can supply. As long as you compensate with the correct jetting and your intake system, including carburetor, is not so large that you don't get enough air/fuel velocity going into the engine, you don't lose low end due to a loss of vacuum.

Imagine this, a supercharger or turbocharger actually does away with vacuum and instead pressurizes the intake system. I think that in itself is good enough argument to show that a loss of vacuum isn't what causes low end torque to diminish.

However, Torque and Horsepower can be changed with different intake configurations. To get better low end (torque) a longer intake tract provides more inertia when the air hits the valves because there is more volume behind it in movement. Shorter intake tracts benefit top end power better because it is easier/faster to pull the air into the cylinder because there is less volume required to move. By adjusting the diameter of the intake tracts, you also have some control of the power curve due to the same momentum and volume physics that I just described above.

Look around on different auto engines. A good example is the V-6 engine built by Yamaha that was used in the early Taurus SHO. At low speed, it breathed through a series of long intake runners, but at high speed, it switched over to short intake runners. Never will you find an auto company blocking the intake system with extra filters or any other device in order to provide more torque.

--Understanding of Science and Engines--
Race Team