What boost levels do you run?

[Iceman56]

Compression ratio has alot to do with the engine torque curve

IMO,you get the best of both worlds with running a high compression ratio , you can run a bigger turbo with less engine back pressure and still have throttle response like its a stock sled with huge amounts of torque

The torque curve of a properly fueled and timed motor with a high compression ratio at 15lbs of boost will look a lot different then the torque curve of a properly fueled motor with low compression ratio at 15lbs of boost.

Do you run straight race fuel with stock compression then?

Is the a point where high compression takes away from top end power on a boosted motor?

 

[relentless rider]

With my new inncooler set up I'm hoping to run pump gas at 12-13 lbs with the same power as before on 15. Will see if the water to air works!

 

[prairiepowderhead]

What is the stock compression ratio of a nytro, And what is it with a 60 thou head shim?????

 

[djones000buck]

I believe the stock compression ratio for the nytro is in the mid to high ten's 10:6 to 10:8 range...

the 60 thou head shim gets you to low 9's, maybe high 8's so you don't have to run high octane gas.

 

[d1100t]

Very good thread here

Lots of good info here.
It would be nice to see the discussion in this thread keep going.

There seems to be lots to know/learn about different turbos, compression, timing and fuelling setups with 4 stroke turbo's.
I defiantly could learn more here from the guys that have been running Yamaha 4 stroke motors for lots of years.

My next project could very while have a turbo charged Yamaha motor in it.
Looking forward to it!!!

 

[gunnerthesnowman]

Do you run straight race fuel with stock compression then?

Is the a point where high compression takes away from top end power on a boosted motor?

Boys , this tread was awhile ago , but yes full C-12 if running 18lb and above , but as you see now in 2014 other turbo kit builders are seeing the benefit of stock compression .

 

[Tarzannr1]

Check out this Nytro

 

[Remmy]

Man, this thread makes me want to get the Apex back in action. I've got a brand new Boost-It fuel injection system sitting in the garage waiting to get installed.

Kind of sidetracked with my new Turbo Viper though, for now at least haha.

 

[Got boost want snow]

I put a boost it on my apex I run 14lb. With the boost it the boondocker set up pulls like a freight train and spools really quick. Mine has a 2860 on it and loves nipple deep powder. Boost it is the best fueling system for a turbo system IMHO

 

[sidehil]

My first boost, not much to say,but it goes!!!!!

 

[sidehil]

Tracker it is!

 

[Phatolguy]

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