Turbo vs. Supercharger??

Tweaker, glad to hear the grizz is back together. I won't be able to make it wed or thurs. Let me know how it goes.

The 50/50 mix is used to control detonation. Actually the mix needs to match to the boost you choose to run. 6psi takes a lot lower mix than 16psi. The problem with blended fuels is if it detonates the damage is more severe than pump fuels.

I have seen problems with poorly designed turbo kits on two RX1s. Both kits were installed as per the manufacturers written instructions which btw directed the installer to use two head gaskets or a head shim. One engine was a complete write off. The other a complete rebuild. The root casue of each was the installer followed the turbo kit instructions, which aggravated detonation with the two head gaskets (increased squish clearance). Both engines were set up at only 6psi and were running mixed fuel (not sure how much). I have not seen the manufacturer of these kits mentioned in this thread, but if it does get mentioned as on option I will speak up.

Notwithstanding the above paragraph, I have seen some very good installations of both turbos and SCs. I have seen a RX1 turbo on 24psi boost successfly running on a blend of methyl and nitromathane (340+ Hp if I remember correctly). Boost does work.

Personnlly, I would go with the SC. Cost being the deciding factor.

Choose an installer that has the knowlegde to help effectively control detonation, even if that means tossing directions away.

New24strokes: Increaseing squish clearance with shims can result in detonation with zero boost. Raise the compression ratio on your lawn mower to 10:1 by milling down the head or deck. It will not run more than a hour on premium fuel; detonation will kill it. The reason is no effective squish velocity. Understanding squish velocity is the primary reason compression ratios have risen over 8:1.

catmando said:

LOL! LMAO! HA! HA! HA!
catmando!

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Went over my head........................Did I do a funny?...................gotta be serious here dont want to go to Bla Bla Bla.

Summiteer said:

Gary, it must be hard to find helmets for that head with such a huge brain in it.

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Hmmm.... helmet size is med/small.

Fact#1: My riding friends call me a retard.
Fact#2: Kim says I have sh*t for brains.
Fact#3: I'd probably better off if I understood women as much as I understand engines and tuning.

Garryese

Are you dyno tuning?

Have you been doing any 2smoke Turboes?

We finished a m1000 and just started a M8.

Curious have you done a B.D. Apex install, had one last year and could not get it to run consistantly. The B.D. box can be a killer.

You real tryed that on your lawnmower, just for sh1ts and giggles didn't you come on admit it.

snotrocket said:

Garryese

Are you dyno tuning?

Have you been doing any 2smoke Turboes?

We finished a m1000 and just started a M8.

Curious have you done a B.D. Apex install, had one last year and could not get it to run consistantly. The B.D. box can be a killer.

You real tryed that on your lawnmower, just for sh1ts and giggles didn't you come on admit it.

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No dyno. Had access to one previously, but no longer. Looking at purchasing a used dyno.

Turboed a RMK800. Customer is happy, but I feel it can better. Pipe dynamics need to be addressed with a turbo and two stroke but no one seems to interested.

Have not done a BD on an Apex, yet. I seen one which looked good and apparently goes very well.

Nope. Not my lawn mower. On karts w/l-head engine it's a known problem. However, on my Sportsman I overheated it; milled the head, then the kid overheaded it again. Instead of replacing the warped head, I had it milled again and used two head gaskets. Net squish clearance was 0.30mm over OEM clearance, so I thought I was good. Detonation cracked the piston skirt but I caught it while checking the spark plug; run time was 30 mins. Lesson learned.

What type and kind of dyno you looking for? Sold our old Land and Sea to a guy and I think He wants to sell it.

Lets remember one thing THERES NO REPLACEMENT FOR DISPLACEMENT. My two cents

HERE'S A SUPERCHARGER FOR SALE IN SHERWOOD PARK.... DON'T KNOW IF ITS STILL FOR SALE, BUT THE PRICE SURE IS RIGHT!!!

I have a 2006 Yamaha apex rtx with a mpi stage 1 supercharger with over 2000 trouble free problems after I figured out how to hold the throttle bobdies onto the engine by cutting the intake boot clamp's spacer in 1/2 to gain a tighter seal.At 10psi i made 240hp at sea level.It is so smooth power with no extra heat under the hood.It is slightly quieter .You must ask your self what do I want to? I wanted to be reliable and quick .There is always someone fast but they are few in the trails in Michigan.But if you are going to play in the mountains or the trails it is easy to make reliable horsepower on a Yamaha but a challenge to get it to the ground without blowing out the snow flap.I run 2 tracks 1 for the trails with the stock 1.25 rip saw track with 240 1.325 mega bite studs,and predator track with 1.08 pixs and chisel for the river-lake runs. I can say I had beaten the zl1 turbo arctic cat and lost to another you can not win them all but it is cool when you do.

ThE problem with a super charger is that they build boost at idle so they are very violent, and it depends on your riding style but super charges are good point and shoot machines but turbos are the best for the trees or delicate riding styles. Turbos won't be as violent and the lag with modern day kits is almost non existent. I personally like turbos more, but regardless of turbo or super the intake needs to be all the way out from under the hood or seat. And lastly a yammi 4 stroke can take ten psi before any head work is needed, and that's 90 to 100 up than you had. And if you need more than that, have fun with that bomb.