Fk8_tuning_development
Member
- First Name
- John
- Joined
- Oct 23, 2020
- Threads
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- 31
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- 36
- Location
- Myrtle Beach South Carolina
- Vehicle(s)
- 2018 Civic Type R
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- #1
This isn’t something new but I couldn’t find any data on this mod on an fk8. So I tested it running hondata. I do know accord owners did do this already. I have heard motec fk8 owners have tested this but couldn’t find anyone on hondata. The oem fuel line from the high pressure pump to the fuel rail has an extremely small outlet. The side coming out of the pump is far smaller. In fact less than. 1/16th if an inch.
Here’s a pic after drilled has to put the before pic and initial pic cause page would not cooperate. Kept throwing it to the bottom.
You can see in the last pic I added a recessed taper and a top taper. The actual hole diameter was increased to 1/16tg of an inch. Test results show it’s 5 percent more fuel from 5000 to 7000 rpm with less pressure loss than non modded line. Many of you already know the Fk8 even though the pump duty cycle isn’t maxed out drops up to 200 psi above 4500 rpm.
I added the recessed taper cause after it was drilled the fluid had a tendency to spray a bit instead of flowing right through. The recessed taper was done with 5/64 but abs the top with a 50 degree countersink but. Then sanded off the rough edging with 1000 grit. then 1500.
Here’s a pic if two different e25 logs.
First is one that doesn’t have fuel line mod.
Both logs had super close fuel pressure and sane exact 12.4 afr and rpm super close.
although it’s 2 different cars both are full bolt on Prl intake with Mishimoto and Prl intercoolers
you can see with the modded line more fuel cause 20 percent aircharge increase and less duty cycle.
it was extremely hard to find a matching rpm with exactly 12.4 aircharge on e25 tunes. It’s not commanded 12.4 it’s actual 12.4 cause commanded means nothing if the car doesn’t hit the target fuel. The first log is not from my car it’s a person who had problems that I had to fix his tune.
The fuel pressure drop is usually less but the modded line car was spinning in 3rd on above the highlighted rpm point.
when traction is solid fuel pressure looks like this with modded line. 100-125 psi loss but better than 200. You can see fuel spiking is not an issue.
Airway done 1500 miles and many different fuels variations.
93
93 plus 500cc meth.
E12 no meth
E12 plus 500c meth
E25 no meth
Renegade e85 race fuel was basis for testing due to it’s consistency and cause the nearest e85 pump is 60 miles.
I personally purchased a new line just in case the ecu didn’t function with the mod. The line will cost between 200 and 300 depending on where you get it. It’s shown as discontinued on Honda parts sights but it is absolutely NOT discontinued.
Yes fuel pulsation is a possible risk but a few accord guys are running bigger 5/64 hole no issues. Going too big can actually cause pressure loss. I’ve found no issues with fueling pressure fuel pulsations or any codes. Started right up.
The mod is involved I suggest you have higher level experience. If you’ve never pulled an i intake manifold off this mod isn’t for you.
if you want to try it I suggest you follow radium port injection for most of the removal. You will still need to remove solenoids and brackets to get to the line. You can NOT sneak it out like accord fuel line mod video the lines and pump are different.
You will need to get the 3 circled items out of the way. The right circle is pointing a bracket on the back of the head and the arrow points to a bracket behind the wire loom.
It takes about 3 hours for a skilled Individual not including drilling the line. If you snap a bit off in the line you’ll ruin it cause you can’t drill it out. Also use a new clean drill bit and don’t push to hard if you cut to fast it will be rough reducing fuel flow.
This mod will not help your current tune you must tune to see hp gains. I may very likely throw it back on the dyno to test hp limits with fuel mod. I’m very busy lately so if I don’t answer right away sorry.
I’m also on Instagram fk8_tuning_development
Email [email protected]
Inquiries are best through the email including custom tunes and dyno tunes. I’m in Myrtle beach SC area for dyno tuning.
heres a pic of most of what needs to be removed.
Before and after just 1/16th hole .
Here’s a pic after drilled has to put the before pic and initial pic cause page would not cooperate. Kept throwing it to the bottom.
You can see in the last pic I added a recessed taper and a top taper. The actual hole diameter was increased to 1/16tg of an inch. Test results show it’s 5 percent more fuel from 5000 to 7000 rpm with less pressure loss than non modded line. Many of you already know the Fk8 even though the pump duty cycle isn’t maxed out drops up to 200 psi above 4500 rpm.
I added the recessed taper cause after it was drilled the fluid had a tendency to spray a bit instead of flowing right through. The recessed taper was done with 5/64 but abs the top with a 50 degree countersink but. Then sanded off the rough edging with 1000 grit. then 1500.
Here’s a pic if two different e25 logs.
First is one that doesn’t have fuel line mod.
Both logs had super close fuel pressure and sane exact 12.4 afr and rpm super close.
although it’s 2 different cars both are full bolt on Prl intake with Mishimoto and Prl intercoolers
you can see with the modded line more fuel cause 20 percent aircharge increase and less duty cycle.
it was extremely hard to find a matching rpm with exactly 12.4 aircharge on e25 tunes. It’s not commanded 12.4 it’s actual 12.4 cause commanded means nothing if the car doesn’t hit the target fuel. The first log is not from my car it’s a person who had problems that I had to fix his tune.
The fuel pressure drop is usually less but the modded line car was spinning in 3rd on above the highlighted rpm point.
when traction is solid fuel pressure looks like this with modded line. 100-125 psi loss but better than 200. You can see fuel spiking is not an issue.
Airway done 1500 miles and many different fuels variations.
93
93 plus 500cc meth.
E12 no meth
E12 plus 500c meth
E25 no meth
Renegade e85 race fuel was basis for testing due to it’s consistency and cause the nearest e85 pump is 60 miles.
I personally purchased a new line just in case the ecu didn’t function with the mod. The line will cost between 200 and 300 depending on where you get it. It’s shown as discontinued on Honda parts sights but it is absolutely NOT discontinued.
Yes fuel pulsation is a possible risk but a few accord guys are running bigger 5/64 hole no issues. Going too big can actually cause pressure loss. I’ve found no issues with fueling pressure fuel pulsations or any codes. Started right up.
The mod is involved I suggest you have higher level experience. If you’ve never pulled an i intake manifold off this mod isn’t for you.
if you want to try it I suggest you follow radium port injection for most of the removal. You will still need to remove solenoids and brackets to get to the line. You can NOT sneak it out like accord fuel line mod video the lines and pump are different.
You will need to get the 3 circled items out of the way. The right circle is pointing a bracket on the back of the head and the arrow points to a bracket behind the wire loom.
It takes about 3 hours for a skilled Individual not including drilling the line. If you snap a bit off in the line you’ll ruin it cause you can’t drill it out. Also use a new clean drill bit and don’t push to hard if you cut to fast it will be rough reducing fuel flow.
This mod will not help your current tune you must tune to see hp gains. I may very likely throw it back on the dyno to test hp limits with fuel mod. I’m very busy lately so if I don’t answer right away sorry.
I’m also on Instagram fk8_tuning_development
Email [email protected]
Inquiries are best through the email including custom tunes and dyno tunes. I’m in Myrtle beach SC area for dyno tuning.
heres a pic of most of what needs to be removed.
Before and after just 1/16th hole .