Flex fuel %
Thread Starter
Heel & Toe
Joined: May 2024
Posts: 17
Likes: 1
Flex fuel %
I've been hearing that C7 's require a fuel pump upgrade if an E85 conversion kit is installed. I've also heard that the stock pump can handle the additional fuel. Anyone out there have any information on which is right. I have a 14 C7 Z51 with the following mods , A+A SI - V3 SC with Standard pulleys , intercooler , headers , billy boat exhaust with tiny cats. I'm making 510 rwhp with a very conservative tune. I have a dynotune planned for this month , hoping to pull significantly more hp than with the last tune . My tuner made one pull on the dyno and called it good. I'd also be interested in opinions on the final rwhp when I'm done. I'm hoping for 600+ , but that may be wishful thinking. What are your thoughts?
Le Mans Master
Joined: Oct 2014
Posts: 8,687
Likes: 2,731
From: Atlanta GA
I've been hearing that C7 's require a fuel pump upgrade if an E85 conversion kit is installed. I've also heard that the stock pump can handle the additional fuel. Anyone out there have any information on which is right. I have a 14 C7 Z51 with the following mods , A+A SI - V3 SC with Standard pulleys , intercooler , headers , billy boat exhaust with tiny cats. I'm making 510 rwhp with a very conservative tune. I have a dynotune planned for this month , hoping to pull significantly more hp than with the last tune . My tuner made one pull on the dyno and called it good. I'd also be interested in opinions on the final rwhp when I'm done. I'm hoping for 600+ , but that may be wishful thinking. What are your thoughts?
Your kit will make 575 to 600 RWHP all day long.....
At that point, you will be out of fuel .... which answers your next question . You don't have enough fuel headroom to run E once its tuned correctly nor will you need it as 600 to 630 is the safe limit for the ring gaps and pistons on a LT1
Dave
Safety Car
Joined: Mar 2004
Posts: 4,048
Likes: 1,479
From: South Florida
There is a lot to consider when tuning for E on these cars. The 2014 low side pump is the weakest year pump. You just need a tuner that knows this platform and knows how to tune for E and know what its limits are for your setup. That said, depending how much E you can run will also determine how much you can turn up the car. You have to be conservative with the LT1 and boost, especially if you're not running meth or high Ethanol blends. I always tune them more conservative so they live.
Instructor
Joined: May 2023
Posts: 231
Likes: 178
From: Northeast Fl
To follow up with above. I just had my 2019 Z06 tuned and knowing this year had the same low side pumps as the ZR1 and could pump more fuel than any year before, we set the limit around E50-E60 for max effort. Anything higher is just for cruising the streets and highway. Final numbers on a super hot day were 626/640 up from a stock tune of 559/593 (same day, same dyno, same hot *** temps and humidity).
Last edited by jaxcam02; Sep 3, 2024 at 07:24 AM.
Le Mans Master
Joined: Mar 2010
Posts: 7,052
Likes: 945
From: DFW TX
To follow up with above. I just had my 2019 Z06 tuned and knowing this year had the same low side pumps as the ZR1 and could pump more fuel than any year before, we set the limit around E50-E60 for max effort. Anything higher is just for cruising the streets and highway. Final numbers on a super hot day were 626/640 up from a stock tune of 559/593 (same day, same dyno, same hot *** temps and humidity).
Instructor
Joined: May 2023
Posts: 231
Likes: 178
From: Northeast Fl
Drifting
Joined: Apr 2000
Posts: 1,390
Likes: 36
From: INDIANA
My stock 14 Z51 with E85 and tune shows a slight dip in fuel pressure close to redline so your car definitely could use more fuel, especially if getting over 60% ethanol. Low side pump is my next mod.
Le Mans Master
Joined: Mar 2010
Posts: 7,052
Likes: 945
From: DFW TX
Yea that is the word on the street is the 19s can handle full E with a good intake, but the moment you pulley it then you get into a fuel shortage situation.
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Thread Starter
Heel & Toe
Joined: May 2024
Posts: 17
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Dynotune results
Found an excellent tuner close to home . Made an appointment and waited for 2 months, but man it was worth the wait. On the first pull the car was running so lean he stopped at 5000 rpms with a pathetic 479 hp. About a dozen pulls later he hit 592 whp and 560 ft. lbs at 6000 and 4900 rpms respectively. That's less than 5 lbs/ hp. VERY QUICK.I want to thank everyone for the advice and opinions. I did have to upgrade coils and wires to eliminate a misfire, but it hasn't run this good in years. Any ideas for my next move up the horsepower ladder? Opinions welcome!!!!