fuel question for experienced tuners.
12-07-2007, 06:49 PM
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fuel question for experienced tuners.
on my zdyne im doing a st tune . my old tune i used a stock map sensor and my boost fuel comp % was at 180. and the value for fuel at 9.2 psi of boost was at 10ms , but now when i change the same exact tune to a 3 bar map the fuel value at 9.2 psi boost becomes only about 5ms ?? isnt this gonna give me way less fuel than what i had using the stock map and make it real lean or is this normal for going from a stock map sensor to a 3 bar map? cause thats the only thing that is changing the fuel value. the tune table stops at like 10 psi for stock map but 3 bar it goes to like 27 or so . im only gonna boost 12 but i wanna figure this out before i go and run a 3 bar and blow something up if fuel is way less. heres a horrible pic of my fuel graph for the 3 bar setting . 
heres another of the same tune but with a stock map sensor. notice the fuel change at the same PSI of boost by only changing the map sensor setting nothing else. ( why would it change . i would think it should just continue on with the setting for a stock map but just add more fuel past the 9 psi column? ) 
Modified by 97grnrs at 9:01 PM 12/7/2007
Modified by 97grnrs at 9:05 PM 12/7/2007
heres another of the same tune but with a stock map sensor. notice the fuel change at the same PSI of boost by only changing the map sensor setting nothing else. ( why would it change . i would think it should just continue on with the setting for a stock map but just add more fuel past the 9 psi column? ) Modified by 97grnrs at 9:01 PM 12/7/2007
Modified by 97grnrs at 9:05 PM 12/7/2007
12-08-2007, 05:21 AM
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from experience with changing map sensors in most any softwares we honda use, it will skew the fuel data slightly.
i have never just been able to swap map sensors and ride out, i have akways retuned the vehicle, and it was always slightly off.
thats why i suggest to my guys who are gonna switch to a 3 bar "in a few weeks" or "soon", just to go ahead and get it and lets do it from the start, unless they like throwing money away
i have never just been able to swap map sensors and ride out, i have akways retuned the vehicle, and it was always slightly off.
thats why i suggest to my guys who are gonna switch to a 3 bar "in a few weeks" or "soon", just to go ahead and get it and lets do it from the start, unless they like throwing money away
12-08-2007, 10:19 AM
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Re: (mrbsponge)
well this post is no longer needed for now cause i went to tune it with mt 3 bar and found out its a gm 1 bar. so its worthless.. back to stock map for now. oh well.
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