Tuning Leaded vs Unleaded fuel
10-17-2006, 11:32 AM
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Tuning Leaded vs Unleaded fuel
What kind of impact will there be by switching from unleaded to leaded fuel? I currently use VP StreetBlaze 101 fuel and am thinking of switching to VP C14. I'm using a standalone EMS (AEM) and have the car tuned at close to 12.7:1 afr on the StreetBlaze 101 fuel. The car runs great with this setup but according to VP, I should be using C14 since my compression ratios are +14:1. Will swicthing fuels mean I would need to completely re-tune my fuel maps? My only concern at this point is that I don't want to switch over so close to an event if its going to require a lot of tuning (which I don't have time for).
10-17-2006, 01:00 PM
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Re: Tuning Leaded vs Unleaded fuel (b16b18)
I'm in way over my head here, but a free bump for you anyway.
As I understand it, the lead additive was only for lubrication purposes. Valve seats and such.
As I understand it, the lead additive was only for lubrication purposes. Valve seats and such.
10-17-2006, 01:30 PM
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Re: Tuning Leaded vs Unleaded fuel (Perfectionist)
some people have problems with leaded fuels and wideband o2 sensors.. maybe watch out for that..
as long as the octane and specific gravity are the same there shouldnt be a difference as far as tune
as long as the octane and specific gravity are the same there shouldnt be a difference as far as tune
10-17-2006, 02:54 PM
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Re: Tuning Leaded vs Unleaded fuel (b16b18)
The whole reason to run leaded fuel is FOR higher octane.
C14 is (surprise) 114 octane leaded race fuel. It is intended for smaller displacement higher reving (8,500rpm+) and higher compression (14:1+) engines. The purpose of higher octane fuel is so you can take advantage of the race engine you just spent too much on by running proper timing to make power. You will gain next to nothing by simply switching to 114 because your timing and fuel maps are for 101. You will need a retune. You don't have an hour to spare?
C14 is (surprise) 114 octane leaded race fuel. It is intended for smaller displacement higher reving (8,500rpm+) and higher compression (14:1+) engines. The purpose of higher octane fuel is so you can take advantage of the race engine you just spent too much on by running proper timing to make power. You will gain next to nothing by simply switching to 114 because your timing and fuel maps are for 101. You will need a retune. You don't have an hour to spare?
10-17-2006, 03:30 PM
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Re: Tuning Leaded vs Unleaded fuel (Mr Hammond)
My setup meets all of the requirements for using C14 (and is also NOt a daily driver). Switching fuels at this point is more of a means to not harm the engine by using an improper fuel.
10-17-2006, 03:49 PM
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Re: Tuning Leaded vs Unleaded fuel (b16b18)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b16b18 »</TD></TR><TR><TD CLASS="quote">My setup meets all of the requirements for using C14 (and is also NOt a daily driver). Switching fuels at this point is more of a means to not harm the engine by using an improper fuel. </TD></TR></TABLE>
From what you're looking at I'm assuming your setup is very high end (you didn't really say what it was). If you switch to that fuel, and make a jump by so much octane, you are definately going to have to re-do your fuel maps. Especially with the switch from L to UL (or vice versa as the case may be).
From what you're looking at I'm assuming your setup is very high end (you didn't really say what it was). If you switch to that fuel, and make a jump by so much octane, you are definately going to have to re-do your fuel maps. Especially with the switch from L to UL (or vice versa as the case may be).
10-18-2006, 04:32 AM
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Re: Tuning Leaded vs Unleaded fuel (b16b18)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b16b18 »</TD></TR><TR><TD CLASS="quote">My setup meets all of the requirements for using C14 (and is also NOt a daily driver). Switching fuels at this point is more of a means to not harm the engine by using an improper fuel. </TD></TR></TABLE>
Did you read anything I said? If your tuner was good, and I am sure he is, he tuned conservatively because you are only running 101 octane fuel. So you should not have any worries with detonation. Why not make your full potential though? We are talking an hour of dyno time and not much more money considering how much 101 is anyways.
Did you read anything I said? If your tuner was good, and I am sure he is, he tuned conservatively because you are only running 101 octane fuel. So you should not have any worries with detonation. Why not make your full potential though? We are talking an hour of dyno time and not much more money considering how much 101 is anyways.
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