This is surprising to me. We just ran out of fuel on Precision 1200CC on E85 with a single rewired Walbro at 27lbs on a 71HTA. Could not keep it richer than 12.8:1. Switched to a rewired DW300 and problem solved however once we stared pushing it again we ran out of injector. Now moving to 1450's. Seems like a lot of HP on one Wally. Must be a freak pump.

Or I had the oldest most tired Walbro ever. Either way great power on stock block.

 

awesome numbers but I'm pretty sure the FP black is a tad bigger.

 

^don't think so.

 

Maybe bigger on the outside but the Ef4 has bigger wheels

 

Your incorrect sir, the ef4 is much bigger then the black. The wheels are noticely different. And even with someone who knows how to spool a turbo fast, I am still full boost by 4800ish for spool. Idk what the black is lbs/min is but I do know the ef4 is in the 60lb/min range.

 

Correct.

 

When I can go back to work and get some more cash, I will be updateing the fuel and I am sure I will be in the 650 range no problem. Hopefully the motor holds up. But if not time for that 2.4 I wanted.

 

well i can tell you that the walbro outflows the dw so if you swapped pumps and you seen a massive difference then there you go.. your old pump was half dead.

also it sounds odd you're running out of fuel so easily with that 71hta.. your tuner might not have your injectors scaled right and it could be minimizing their max capabilities.

off the top of my head i think you should be able to get around 500 out of 1200's on stock fuel pressure if the pumps there.

 

the compressor wheel if im not mistaken is bigger on the ef4 which is why it lags more downlow.

 

yes 650 easy with your mod list.. also you're banned from making power until you change the fuel pump to the buschur double.

i detuned this car awhile ago.. hes been running on 93 or e85 and low boost for awhile now.. theres no point in going for power when the fuel isn't there to support it. in due time he will get some high power though..it will be well worth the wait once its all done.

 

ah, I see. I've been trying to find out more info on those two turbos, but there just isn't a lot out there. My stroker setup is all MAP, and I was going to go with a FP black, but honestly, I love dealing with MAP, so I may opt for the EF4 instead. We'll see. They've been very good to me.

 

tscompusa, did you get my PM? Looks like I should get a double pumper and bigger injectors.

 

yes i see it, ill read it now and respond.

 

The EF4's comp wheel is BARELY bigger than an FP Blacks comp wheel on the inducer.