Max boost with stock fuel system
- Thread starter BigAir
- Start date
L
lightening800
Well-known member
at 6-7000' i was told i could run 7-8psi no problem on premium fuel, i will mix a bit of av gas to be sure though, cheap reassurance.
m7?
im not trying to steal your thread but i was wondering the same thing on a m7 riding about 4500 to 6500. thank you
im not trying to steal your thread but i was wondering the same thing on a m7 riding about 4500 to 6500. thank you
stock
Im far from some guru, but have experienced plenty of pleasure and equal heartache after 4 years of messing with the M6-M7. Ive found different results depending on multiple factors. These being primarily fuel controllers and regulators. I experimented heavily last season. Enough that I didnt ride much between screwing around and burning down.
My findings with a 2860:
I will tell you right now a stock m7 fuel pump will not fuel 4 injectors.
At 8lbs, a stock M7 pump will not provide the additional 16lbs pressure (2:1 regulator). The pump simply can not keep up with the demand.
At 8lbs and 2 injectors with a 1:1, you can make it work with a BD box, BUT, on longer pulls you will see fuel pressure diminish. 4-5lbs was about my max finding.
(PM mtnmikeonboost if you have questions about your aerocharger. I think he was able to run his stock fuel pump with 2 injectors around 8lbs if I can remember right).
Other note: The BD fuel box seems to have more ability to max the injectors out than my PL box or AI box.
I have tried several different pumps and setups over the couple seasons.
Theres probably only 2 approaches I havent tried, one being:
Using the stock pump with an intank 1:1, BUT ALSO running a secondary fuel line directly from the tank through an inline pump to the aux. (secondary) fuel rail with its own dedicated regulator. Im running 4 injector throttle bodies so this test/option was off the table for me unless I go backwards a bit. The problem with these experiments is not being able to control the fuel amount balance between the main and aux injectors.
Ive moved away once again from the stock intank pump.
Im far from some guru, but have experienced plenty of pleasure and equal heartache after 4 years of messing with the M6-M7. Ive found different results depending on multiple factors. These being primarily fuel controllers and regulators. I experimented heavily last season. Enough that I didnt ride much between screwing around and burning down.
My findings with a 2860:
I will tell you right now a stock m7 fuel pump will not fuel 4 injectors.
At 8lbs, a stock M7 pump will not provide the additional 16lbs pressure (2:1 regulator). The pump simply can not keep up with the demand.
At 8lbs and 2 injectors with a 1:1, you can make it work with a BD box, BUT, on longer pulls you will see fuel pressure diminish. 4-5lbs was about my max finding.
(PM mtnmikeonboost if you have questions about your aerocharger. I think he was able to run his stock fuel pump with 2 injectors around 8lbs if I can remember right).
Other note: The BD fuel box seems to have more ability to max the injectors out than my PL box or AI box.
I have tried several different pumps and setups over the couple seasons.
Theres probably only 2 approaches I havent tried, one being:
Using the stock pump with an intank 1:1, BUT ALSO running a secondary fuel line directly from the tank through an inline pump to the aux. (secondary) fuel rail with its own dedicated regulator. Im running 4 injector throttle bodies so this test/option was off the table for me unless I go backwards a bit. The problem with these experiments is not being able to control the fuel amount balance between the main and aux injectors.
Ive moved away once again from the stock intank pump.
M
mtn mike on boost
Well-known member
first off, the stock cat fuel pump is the same part # m6,7,8,1000.so the m1000 pump does not flow any more than the m6 pump.for two seasons i was able to run 10#'s on the stock pump w/o running out of fuel on long pulls.keep in mind, i was not running dual injectors.i don't think it would flow enough on top at 12#'s, as i tried this and didn't like the results.
i also am no GURU, this is just what i experienced....mm
R
Rms Rydning
Well-known member
It is suposed to be able to deliver fuel to 230bhp NA. My 1200 NA have maxed the fuelsupply around 215-220bhp . With boost you need higer fuel pressure and this gives more load on the pump and will be probably down to around 200bhp.
But if you run at 10000ft you are down to 110-120bhp in a NA sled and then you should be able to run 10 psi or may be 12psi with better fuel.
At sea level you will max the fuel supply at 4-5 psi boost.
But if you run at 10000ft you are down to 110-120bhp in a NA sled and then you should be able to run 10 psi or may be 12psi with better fuel.
At sea level you will max the fuel supply at 4-5 psi boost.
Thanks for the replies. Lots of different answers. I had one reputable kit builder tell me 9 lbs with no fuel system changes. Another kit comes with a fuel pump and is suppose to be good to 10 lbs. I will be riding 7-10k which will help. I am thinking 7-8 with a fuel pump should be safe and after that you are playing with fire. Agreed?
That is definitely the question. No one seems to agree.
D
Dirty10
Well-known member
Had a long chat with the boys from BD today unlike the prediction that some of thier dealers are giving they are saying yes possible for stock injectors to get 300 hp but in a VERY perfect world only.. So the numbers we talked out of the1000 PG kit will be more like 230 240 at that 8000 ft mark. I hope its enough because I really wanna spank azz all over that eastern oregon barbie nitro!!!!!
