[farrk007]

Originally Posted by KingLT1

All a pulley will do is increase power on the first hit, then the blower is hot enough that you lose the added power because IAT is up in a range where timing will be pulled to keep from getting knock retard. Adding ethanol fixes a lot of short comings from the cooling side of the stock blower. Your best bet if limited to 93 octane is to do Intake, headers, ported blower. Gain power through efficiency improvements...not by forcing more hot air through a system that is limited by cooling and flow restrictions.

Not to hi-jack this thread but this also applies to my current situation. Looking to add the flex-fuel kit to my stock ZL1, then get a tune and I wanted to also swap out the upper pulley to compliment that E85 tune. Does this make sense? I intend to just keep it at that for now.

[Z OH 6]

Originally Posted by farrk007

Not to hi-jack this thread but this also applies to my current situation. Looking to add the flex-fuel kit to my stock ZL1, then get a tune and I wanted to also swap out the upper pulley to compliment that E85 tune. Does this make sense? I intend to just keep it at that for now.

You can get away with a 2.3 upper and E85 which is common. I would probably install a DSX aux fuel pump though to go along with it.

[farrk007]

Originally Posted by Z OH 6

You can get away with a 2.3 upper and E85 which is common. I would probably install a DSX aux fuel pump though to go along with it.

Thanks for this!!

[KingLT1]

Originally Posted by farrk007

Not to hi-jack this thread but this also applies to my current situation. Looking to add the flex-fuel kit to my stock ZL1, then get a tune and I wanted to also swap out the upper pulley to compliment that E85 tune. Does this make sense? I intend to just keep it at that for now.

The Ethanol will allow you to push the blower harder so yeah a 2.3 pulley would be fine as ZOH6 mentioned. I was specifically referencing pump gas in that post. Ethanol/Methanol fuels allow for a lot hotter air temps and not need to pull timing.

[farrk007]

Originally Posted by KingLT1

The Ethanol will allow you to push the blower harder so yeah a 2.3 pulley would be fine as ZOH6 mentioned. I was specifically referencing pump gas in that post. Ethanol/Methanol fuels allow for a lot hotter air temps and not need to pull timing.

Noted, Thank you.

[Z OH 6]

Originally Posted by KingLT1

The Ethanol will allow you to push the blower harder so yeah a 2.3 pulley would be fine as ZOH6 mentioned. I was specifically referencing pump gas in that post. Ethanol/Methanol fuels allow for a lot hotter air temps and not need to pull timing.

And I believe...and you would know better than me, I think using a 2.3 upper and full E85 with a DSX aux pump would be close to maxing out the stock fuel system, maybe a little more room in there for headers possibly but I don't think there's much more at full E85.

[KingLT1]

Originally Posted by Z OH 6

And I believe...and you would know better than me, I think using a 2.3 upper and full E85 with a DSX aux pump would be close to maxing out the stock fuel system, maybe a little more room in there for headers possibly but I don't think there's much more at full E85.

Yeah, Probably would be blending to E60 unless you run it on the lean side. AFR target plays a huge roll in how far the fuel system will go. I stay around .84 on LT4 stuff, but I know some push them leaner

[ZLRob]

Originally Posted by KingLT1

Yeah, Probably would be blending to E60 unless you run it on the lean side. AFR target plays a huge roll in how far the fuel system will go. I stay around .84 on LT4 stuff, but I know some push them leaner

.84 lambda is the money target. I found that the most power on this platform is made at that target on ethanol.


Agreed though, with those mods on a stock fuel system you'll have to start blending to E60. E50 will give you a touch more headway, but there is a lot of modification you have to do in order to optimize the fuel system on these to stay in compliance with proper fuel volume and pressure delivery.