9krpmrx8's Boost Build Thread
#2051
SARX Legend
Thread Starter
iTrader: (46)
Yeah the problem is all the highways around here have hills so it messes with the calculated load. I did find a huge parking lot last night at a football stadium and I got some logs. I will have the weekend free and I will try to get over to the AT&T Center where I can get some better more consistent logs.
#2057
SARX Legend
Thread Starter
iTrader: (46)
RWD are you running a fuel pressure gauge? I notice when when the load starts to get on the high side my fuel pressure gauge fluctuates between 50-60psi where usually it is solid at 60PSI. I hope it's not the Walbro/BHR pump because it's not too old. It only happens every now and then. I am thinking of grounding the fuel pressure sender to see if it is a gauge issue.
#2064
SARX Legend
Thread Starter
iTrader: (46)
I'm gonna ground the sender and check it out. I want to get this situated before I get into boost. basically when I am cruising and i get up tp the 4,000RPM range, the gauge starts to hop back and forth between 50-60psi. It doesn't do it often which is why it worries me. I have an extra stock pump or two, I guess I could swap one in. I will ground the sender tomorrow and keep an eye on fuel pressure. If it is the pump I guess i will contact Charles and see what he recommends.
#2068
Registered
iTrader: (3)
the s2 pump has served me well...... Its a much better denso pump and cup assembly design.
We dont need an increased flow rate at the power level we are doing. Just throwing out an option.
Over the years I have learned that if an oem part will work in your build--stick with it.
We dont need an increased flow rate at the power level we are doing. Just throwing out an option.
Over the years I have learned that if an oem part will work in your build--stick with it.
#2069
No respecter of malarkey
iTrader: (25)
With an internally regulated pump setup you have no pressure compensation for boost. Pump pressure loss could get catastrophic in a hurry. If it is accurately dropping below 56 psig then the pump is no longer engaging the bypass/siphon assembly. I thought the low speed control kicked out sooner than this (buried in my notes somewhere) but you can bypass the low speed pump operation resistor so that it runs full voltage continuously as a test to verify. I would have expected a 255 l/h pump to keep up regardless.
#2070
Registered
iTrader: (3)
pump speed basically is controlled by throttle position---if I remember right Team. But you are right--running it at high speed all the time can be done and it really doesnt hurt the pump.
On the way for me is a fuel pressure gauge that has a warning light/signal that I hopefully can use to cut ignition or throttle.
On the way for me is a fuel pressure gauge that has a warning light/signal that I hopefully can use to cut ignition or throttle.