[2023_ZL1-AUTO]

So is it even worth adding a Flex Fuel kit to a new ZL1 if your not also changing out the low side/high side fuel pump or injectors? What would stock allow, like e20? I'm contemplating not installing my DSX Flex Fuel kit if is will end up being a domino effect to other mods.... I'm mod'ed out at the moment ! (out of gas... no pun intended!)

[Z OH 6]

If the car is otherwise stock, you can use the stock fuel system and safely go to E50 without any issues.

[RobZL1]

You've got headers / intake / throttle body at this point, right? (not counting exhaust since it really won't matter for purposes of this discussion)

If I'm not missing anything, I'll bet you could run e40 with your mods.

@KingLT1 could chime in with a more specific #.

[2023_ZL1-AUTO]

Originally Posted by RobZL1

You've got headers / intake / throttle body at this point, right? (not counting exhaust since it really won't matter for purposes of this discussion)

If I'm not missing anything, I'll bet you could run e40 with your mods.

@KingLT1 could chime in with a more specific #.

OK!

[RobZL1]

If you go this route, you might want a JMS for insurance. I'm sure someone will add advice based on their experience.

[2023_ZL1-AUTO]

OK, so from what I'm finding, in most all cases, it looks like for a stock fuel system adding E, a JMS module is really kind of required? Looks like I will need to go that route. What happens if you end up mixing E10, E20, E30, E40 etc... then finally go past what your fuel system can handle (E-50), or is that not how it works? Would you need to siphon out and start over?

[RobZL1]

Originally Posted by 2023_ZL1-AUTO

OK, so from what I'm finding, in most all cases, it looks like for a stock fuel system adding E, a JMS module is really kind of required? Looks like I will need to go that route. What happens if you end up mixing E10, E20, E30, E40 etc... then finally go past what your fuel system can handle (E-50), or is that not how it works? Would you need to siphon out and start over?

Your tuner will tell you the maximum e content. Then if you go over, just don't got WOT until you can adjust it back down. The fuel system can handle e100 if you are just putting around town.

[2023_ZL1-AUTO]

Originally Posted by RobZL1

Your tuner will tell you the maximum e content. Then if you go over, just don't got WOT until you can adjust it back down. The fuel system can handle e100 if you are just putting around town.

OK Got'cha! Thanks for the info !!!!

[Z OH 6]

Originally Posted by 2023_ZL1-AUTO

OK, so from what I'm finding, in most all cases, it looks like for a stock fuel system adding E, a JMS module is really kind of required? Looks like I will need to go that route. What happens if you end up mixing E10, E20, E30, E40 etc... then finally go past what your fuel system can handle (E-50), or is that not how it works? Would you need to siphon out and start over?

No. You wouldn't siphon it out, but if you're unable to dilute it by adding more 93 octane then you would just drive the car until you use some fuel and can add some 93 octane. You just wouldn't drive the car hard, you would drive it sensibly.

[CW3SF]

Originally Posted by 2023_ZL1-AUTO

OK, so from what I'm finding, in most all cases, it looks like for a stock fuel system adding E, a JMS module is really kind of required? Looks like I will need to go that route. What happens if you end up mixing E10, E20, E30, E40 etc... then finally go past what your fuel system can handle (E-50), or is that not how it works? Would you need to siphon out and start over?

The JMS booster is great for a bolt on car. You can see my mods in my sig below and with the JMS my limiting factor is still high side fuel. The JMS is doing great work for me. And I will second the recommendation to get KingLT1s input if possible. He’s very well versed in this area.

[2023_ZL1-AUTO]

Originally Posted by Z OH 6

No. You wouldn't siphon it out, but if you're unable to dilute it by adding more 93 octane then you would just drive the car until you use some fuel and can add some 93 octane. You just wouldn't drive the car hard, you would drive it sensibly.

Thanks!