BJ74 13b-t fuel adjustment (1 Viewer)

Joined
Aug 13, 2020
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5
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Otago NZ
Hi All,

Proud owner of an unmolested BJ74 13b-T for the past 6 months. I’ve been ticking along a few upgrades for performance and reliability. 2.5” straight through exhaust, boost tapped at 14lbs.

I have been looking at upping the fueling based on some of the awesome information on here. I have increased the main fuel screw two turns clockwise (winding in) and I haven’t seen any performance impact. EGT remains the same, about 550-580c on a heat saturated hill climb, no additional smoke, I haven’t noticed a difference in power.

It was wired shut, so I’m pretty sure it was as per the factory floor settings. Do I still keep winding it up in increments, or should I be looking at something else first; something obvious I’m missing?

Cheers
 
Joined
Aug 13, 2020
Messages
5
Location
Otago NZ
Hi,

I'm adjusting this one:

Cheers
 
Joined
Jul 3, 2004
Messages
3,984
Location
Anchorage, AK
Kind of looks like the same one, except on mine you need an Allen head wrench to move that rod. You turn it out to increase max fuel, so left turns? Do you have a adjustable boost controller?
 
Joined
Aug 13, 2020
Messages
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Location
Otago NZ
Thanks, maybe that's what I am doing wrong.. Everything else I have read on this forum suggests it is clockwise direction. Lock nut anti clockwise, fuel screw in clockwise. No adjustable controller. A boost tee before the actuator set to provide up to 14lbs. Measured with a auberins EGT + boost combo
 
Joined
Jul 3, 2004
Messages
3,984
Location
Anchorage, AK
there is another fuel screw, I think it is called a off boost fuel adjustment or something like that, that one is on the back side and that one you would screw in to get more fuel, at least that's how I understood it.
 

FJBen

SILVER Star
Joined
Apr 1, 2004
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Northern Colorado
Seems weird you screwed it in 2 times and did nothing. I turned mine 1/2 then another quarter so 3/4 total and it made a huge difference.

I’m at 14psi as well, stock exhaust on a full rebuilt engine/IP/injectors and turbo and she runs pretty peppy. My EGTs (Auber dual guage) can push up to. 700c plus pushing a hill and pushing on it. Before I messed with fuel it would barely go above 1000f.
 
Joined
Aug 13, 2020
Messages
5
Location
Otago NZ
Seems weird you screwed it in 2 times and did nothing. I turned mine 1/2 then another quarter so 3/4 total and it made a huge difference.

I’m at 14psi as well, stock exhaust on a full rebuilt engine/IP/injectors and turbo and she runs pretty peppy. My EGTs (Auber dual guage) can push up to. 700c plus pushing a hill and pushing on it. Before I messed with fuel it would barely go above 1000f.

Thanks. Ive been adjusting a quarter turn at a time, battery and airhorns in and out 8 times now.

Confirming it is a screw in - clockwise not out?

Cheers
 
Joined
Mar 11, 2007
Messages
2,346
Battery out? The screw is near the top of the pump, I screwed mine in all the way, goes good now.
 
Joined
Aug 13, 2020
Messages
5
Location
Otago NZ
Battery out? The screw is near the top of the pump, I screwed mine in all the way, goes good now.

thanks Hulsty, your posts have been what I’m referencing. I’ll keep screwing it in and see how I get on. It’s 24v if that makes a difference? I cant get in there without removing the second bat and the horns

image.jpg


The fuel screw is on the top right hand side of the pump here?

image.jpg
 

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