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.

 

You can, but sometimes cruise log speads get tricky when finding the right gears, rpm, and speeds

 

Exactly, at higher speeds on a perfectly flat road you can set the cruise control at the specific RPM and log.

 

Luckily where I'm at most roads are flat and long!

 

You know it's funny because I always considered SA to be pretty flat but even the slightest incline will cause the load to bump up.

 

lucky for me I can drive 1 mile from my house and have a very long road to do some logging.

 

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.

 

No I don't have a fuel pressure gauge.

 

^^ My Fuel pressure fluctuates; but I would only say between 57-62 psi

 

What Walbro model # is the replacement for ours?

 

I'm not sure, I bought the whole pump assembly with the Walbro from BHR.

 

You need a new pump.

 

If the walbro's are no good then what is? Aeromotive?
http://aeromotiveinc.com/products-pa...-inlet-inline/

 

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.

 

are you bouncing around low/high speed function. that shouldnt matter but.......

 

I thought I saw somewhere that even MM stopped using the walbaro unit. Its hard to beat areomotives new stealth units. Wonder if they have one in drop in size and fittings.

 

Yea they burn up if you let the fuel get to low. At least that's what i think they thought the issue was.

I still got my stock pump on my baby is about to hit 140k! I think I'm close to 16k on my rebuilt engine.

 

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.

 

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.

 

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.

 

Mine did it again today. I going to start logging higher RPM cruises this week so I will see if it is affecting anything in the logs.

 

priority one.

 

let me get my popcorn first, k?

 

How does one bypass the resister team?

 

Easiest is to pull the fuel pump relay and put a jumper between the two main poles.

The relay cuts in to send low volts to the pump.