What boost levels do you run?

What boost do you run?


  • Total voters
    482

Iceman56

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Nov 27, 2007
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Compression ratio has alot to do with the engine torque curve :face-icon-small-win

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 :face-icon-small-hap

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.:yo:
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?
 

djones000buck

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Oct 15, 2010
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Birch Run, Michigan
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

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Nov 30, 2011
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Saskatchewan Canada
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

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Nov 26, 2007
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Red Deer , Alberta
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 .:face-icon-small-win
 

Remmy

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Dec 28, 2003
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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.
 
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
 
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