Nick Kickass
Registered
Hello.
RCC turbo kits have a rising rate fuel pressure regulator that causes the fuel pressure to go up to ~100 psi when under boost.
I have read that the purpose of this is to extend the range of the stock fuel injectors.
The guy trying to tune my bike says that the issue is, when under boost the fuel pressure is so high that the fuel injectors are locked open and therefore the changes made in the power commander have no effect.
I have read this somewhere too about fuel injectors - that they lock up above 60 or 70 psi.
He said the CO reading when it goes on boost is in the realm of 9-13 (which, according to this table [ The MG Experience: Library: CO% to Air Fuel Ratio (AFR) Table ] is obviously too rich I'd be shooting for more like 7-8 ) and basically with the way the kit is designed you have no control over the fuel when it is on boost.
Basically, to get it to run without being WAY over rich, I need bigger injectors (apparently the injectors found on the honda S2000 might work) and a normal boost regulated fuel pressure regulator that doesn't spike the pressure way high - just one that increases the fuel pressure by 1 psi for every 1 psi of boost.
They took it off the dyno and reverted the map on the top end to what it used to be when they saw they apparently had no control over the injectors while on boost.
So heres an important question: they didn't take it up any higher than 8K rpm (with less than full throttle). Does this kit lean out to a proper air to fuel ratio at higher rpms?
Their claim that these turbo kits are junk obviously has at least some truth because some basic kit problems they fixed were:
- Fixed air leak that was due to the kit using cheap hosing and used silicon hosing instead
- Fixed voltage drop between battery and fuel pump - fuel pump was drawing too much current for stock wiring so they now have stock harness controlling a relay and motor has a direct line to the battery.
So yeah. What is going on here?
RCC turbo kits have a rising rate fuel pressure regulator that causes the fuel pressure to go up to ~100 psi when under boost.
I have read that the purpose of this is to extend the range of the stock fuel injectors.
The guy trying to tune my bike says that the issue is, when under boost the fuel pressure is so high that the fuel injectors are locked open and therefore the changes made in the power commander have no effect.
I have read this somewhere too about fuel injectors - that they lock up above 60 or 70 psi.
He said the CO reading when it goes on boost is in the realm of 9-13 (which, according to this table [ The MG Experience: Library: CO% to Air Fuel Ratio (AFR) Table ] is obviously too rich I'd be shooting for more like 7-8 ) and basically with the way the kit is designed you have no control over the fuel when it is on boost.
Basically, to get it to run without being WAY over rich, I need bigger injectors (apparently the injectors found on the honda S2000 might work) and a normal boost regulated fuel pressure regulator that doesn't spike the pressure way high - just one that increases the fuel pressure by 1 psi for every 1 psi of boost.
They took it off the dyno and reverted the map on the top end to what it used to be when they saw they apparently had no control over the injectors while on boost.
So heres an important question: they didn't take it up any higher than 8K rpm (with less than full throttle). Does this kit lean out to a proper air to fuel ratio at higher rpms?
Their claim that these turbo kits are junk obviously has at least some truth because some basic kit problems they fixed were:
- Fixed air leak that was due to the kit using cheap hosing and used silicon hosing instead
- Fixed voltage drop between battery and fuel pump - fuel pump was drawing too much current for stock wiring so they now have stock harness controlling a relay and motor has a direct line to the battery.
So yeah. What is going on here?
how could you be so selfish
