posted April 30, 2003 08:01 PM
The bases for observation / statement #2 is what?
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To those who do not count their life in years, but in how life
has touched them in the past and how much it can hold in the
future; -- Youth is forever.
posted April 30, 2003 08:07 PM
According to my tuner the vacuum at the reed valves is quite high and can suck vapours beyond the requirements for PCV through the exhaust.
In addition anything that comes out of the crankcase will flow through the engine instead of the exhaust.
He has extensive experience building perforamnce engines. So on his advice I'm going to return the PCV connection to the airbox.
posted April 30, 2003 08:27 PM
The teory is nice as long as you set at idle or block off the ram air. Hard to provide vacuum in the air box when the airbox is being pressurized with the ram air.
The factory runs the vapors through the air box to minimize emissions. I want lower crankcase pressure. And the mod makes sense as it provides positive vacuum at all speeds and in all conditions. And there are a number of extremely qualified engine builders on both sides of this equation.
____________
To those who do not count their life in years, but in how life
has touched them in the past and how much it can hold in the
future; -- Youth is forever.
posted April 30, 2003 08:56 PM
How would vapors or the occasional bit of wheelie oil coming from the Crankcase make it through the engine?
With the CC vacuum mod ,doesn't the exhaust create the vacuum....drawing all the gobbledeegook into the header???
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uh oh
posted May 01, 2003 09:29 AM
All you have to do to map the idle (clean air false readings) is clamp the hose coming from the airbox while your setting the idle A/F...
It IS recomended to block them off though
Why do racers put vacuum pumps on race cars (ProStock bikes also) if it's not a good idea to lower crankcase pressure???
First time (talking to MANY people) I have ever heard that one...
I agree with Z...the factory does it for emissions...
posted May 01, 2003 09:33 AM
Oh ya...why on earth do you need MORE THAN -45 anywhere in your map????
Even with the muzzy fuel pump I don't need #s like that in the bikes that I do /)
posted May 01, 2003 12:15 PM
According the tuner he said he tunes to an A/F ratio of 12.9, it seemed a bit low to me but he assured me that in his experince this produced the best results on a ZX12R.
What do others use?
If I wanted to adjust the entire map assuming it was all at 12.9 how much would I have to reduce to change the entire map to 13.5 for instance??
Needs a life
Full throttle!
Posts: One MEEEEEELLION
posted May 01, 2003 06:25 PM
If the bike feels great, and runs great, I wouldn't mess with it. You can end up chasing your tail. While some cells will give you 13.5 by subtracting 6 from the present value in the cell, that's not true for every cell in the map. Hence, there's no quick way of changing the A/F ratio across the entire range of rpm and throttle position.
posted May 02, 2003 09:17 AM
SWFT is right...DON'T mess with it if your happy with how it runs...
Just as he said...changing multiple cells by the same amount doesn't work...
12.9 is good for power...I map the smaller throttle settings leaner for fuel economy though...
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posted April 30, 2003 05:39 PM
posted April 30, 2003 08:01 PM
