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Old 04-17-2012, 01:22 PM
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low boost fueling on h&s

what is the low boost fuel setting for? is there any performace increase if set to 1-5? or is it just smoke levels.. thanks
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Old 04-17-2012, 01:47 PM
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Setting 1 will be less "snappy" and less smokey and setting 5 will be "snappier" and smokier.
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Old 04-17-2012, 02:00 PM
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the LBF controls fuel delivery at the start of acceleration/low boost...so if you set your LBF at -0- it will take a little longer to get going....-0- is close to stock. the more you turn up LBF the more fuel you will get injected into the system earlier on...the lower the LBF ..the longer it takes to spool-up. and of course when there is less fuel introduced, there wiill be less smoke. I think thats the correct way to explain it....if your looking for mpg's -0-...if your looking for performance -5-. the default in the Mini Maxx is -3-. the higher the LBF, the snappier your truck will be. Some trucks look like real coal burners on the -5- setting...while others only smoke if you womp the throttle. no two trucks are exactly the same...as i'm sure your finding out.
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Old 04-17-2012, 03:32 PM
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thats what i was looking for.. thanks alot..
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Old 04-17-2012, 03:48 PM
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Anytime...happy tuning
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Old 04-17-2012, 04:49 PM
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This is the exact opposite way than H&S explained to me. the lower the number, the less fuel at low boost, and the more snappy it will be and of course less smoky. The higher numbers are for those people that have turbo or nitrous mods.
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Old 04-17-2012, 07:35 PM
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No you have it backwards. It's snappier the higher the low boost fueling is because it lights the turbos quicker which means better throttle response. The lower numbers wait to introduce more fuel until the turbo's spool up which reduces a little power but creates minimal smoke.

I left mine on default which is 3 and I'm just easy on the pedal until it lights to prevent the smoke. Once you drive it once or twice it's very easy to control the smoke. I see some guys with their back fender and bumper covered with soot and I just wonder how much they romp on it to get it to coat the truck like that, looks to me like a bunch of wasted fuel
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Old 04-18-2012, 02:16 AM
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welll..after Mr. Sanman's post i spent the rest of my evening reviewing older threads/posts from several forums...mostly the posta from H&S techs pretty much only spoke of smoke...more and less...or "rolling coal"...... one post i found refered to low end torque/hp curve ...an increase the higher the LBF setting. personally when ever i turn up my LBF the truck wants to go...and is inconsistantly smoky....i do believe the setting is primarily aimed at folks with larger/modified turbos ....i'm going to do more reading. one thing is for sure...IMO...mileage is better the lower the LBF and your turbo and engine will last longer the lower the LBF...EGT's are lower the with less LBF.
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Old 04-18-2012, 06:27 AM
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Quote:
Originally Posted by travisH3 View Post
No you have it backwards. It's snappier the higher the low boost fueling is because it lights the turbos quicker which means better throttle response. The lower numbers wait to introduce more fuel until the turbo's spool up which reduces a little power but creates minimal smoke.
Im not trying to argue, but i spoke with H&S on this and im just reporting what they said. More low boost fuel can overwhelm the stock turbos before they have enough air pushed in to create good combustion. Thus more lag and slower psi build up. The truck is capable of more fuel than it can use at any given time. Turning the low boost fuel down will slow the amt of fuel introduced at low boost and more effective lets the engine combustion catch up with the fuel and turbo psi being introduced to it......snappier feeling throttle. You probably only really need the low boost fuel turned all the way if your running nitrous or quicker spooling turbos that get large amounts of air into the engine at much lower RPM's. Again, i might have misunderstood, but this is just what I heard him say on the phone.

Last edited by sanman28; 04-18-2012 at 06:30 AM.
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Old 04-18-2012, 07:11 AM
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Thank you........no one here...well i'm not ever beyond correction...like i said ...i spent the night(while H&S is closed....hahaha) reading thr older posts for a more definitive answer. No arguement here.
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