Olds ticket to 9s... LS swap adventure.

[Burning]

The complete how to. No such thing as hijacking this thread if we are sharing good ideas and solutions.

Variable speed fuel pump via holley(or any stand alone ems) - LS1TECH - Camaro and Firebird Forum Discussion

Forced Induction - Variable speed fuel pump via holley(or any stand alone ems) - Just gonna share this because it blows my mind people dont do this, or they have a standalone and still buy a 400dollar PWM pump controller.. Or worse a voltage controller This was done with a single wire from the...

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To answer your question about the second pump, its just a Y fitting and a -8 check valve on the 4303 side. Probably going to be on the frame rail.


Something like this.
View attachment 159428

Yup thats what i thought about with the Y fitting. However if i can run the pump in PWM format, hell saves me some money on a pump, lines, and fittings. However the the 4303 will run out of steam at about 950-1000 rwhp on e85, which the in tank pump a 255lph will give her a little more room to stretch.

If you contact MF, they’ll tell you it can be pulsed. Our partner we ran drag week with last year ran a 4303 pulsed for the entire week. I know two others locally, that are doing it as well. I have to admit though, there is nothing wrong with running both pumps, just the 4303 is an animal at full voltage. The biggest issue with them is the heat they generate due to excess pressure according to MF. Running them PWM slows the overheating down as well.

I am truly curious of how the fuel trims will be when the 4303 turns on in the dual setup. I know my return (#6) is not big enough, but my fuel pressure spikes having a second aem380 turn on at 6psi. It takes until 12-14psi to level out to 58+current boost - which is fine because I live at less than 18 psi for about 1-1.5 seconds.

Sweet, i did not know that and that is a awesome detail to have. I am too curious im assuming with a good regulator it should hold it fine, but you really wont know until you test it.

When you do have the spike in your fuel pressure, do you see that in your data log for AFRs? obviously rich is better than lean, i am just curious.

 

[64nailhead]

However the the 4303 will run out of steam at about 950-1000 rwhp on e85, which the in tank pump a 255lph will give her a little more room to stretch.



Sweet, i did not know that and that is a awesome detail to have. I am too curious im assuming with a good regulator it should hold it fine, but you really wont know until you test it.

When you do have the spike in your fuel pressure, do you see that in your data log for AFRs? obviously rich is better than lean, i am just curious.

The regulator only controls pressure, if the return can handle the volume. I mentioned previously that we tried running both 380’s on stock truck rails simultaneously with a stock regulator. It broke the tail when the pressure exceeded 100 psi at idle. Worked for about 10 minutes, then kaflooey lol. Might have had more pressure than 100, but was the most my lowdollar Motorsport sensor reads. I do have datalogs showing the pressure rise - it’s a quick way to confirm the 2nd pump actually turned on. I can see it in the burnout box if I can keep track of fuel pressure on the little screen. I’ll post a datalog screen shot showing it once I’m north of the equator later this week.

Regarding your mention of the 1000hp limit on e85 with a 4303 - my drag week friend, who also is the local dyno operator and owner is making north of that without issue. It should make an easy 1200-1300 whp on E85 (not crank hp).

Good luck - Jim.

 

[Burning]

The regulator only controls pressure, if the return can handle the volume. I mentioned previously that we tried running both 380’s on stock truck rails simultaneously with a stock regulator. It broke the tail when the pressure exceeded 100 psi at idle. Worked for about 10 minutes, then kaflooey lol. Might have had more pressure than 100, but was the most my lowdollar Motorsport sensor reads. I do have datalogs showing the pressure rise - it’s a quick way to confirm the 2nd pump actually turned on. I can see it in the burnout box if I can keep track of fuel pressure on the little screen. I’ll post a datalog screen shot showing it once I’m north of the equator later this week.

Regarding your mention of the 1000hp limit on e85 with a 4303 - my drag week friend, who also is the local dyno operator and owner is making north of that without issue. It should make an easy 1200-1300 whp on E85 (not crank hp).

Good luck - Jim.

Good to know, my buddy ran out of steam on his at 1024rwhp on e85. Wondering if his is a issue with plumbing. I planned on running a -8AN return as suggested by Magnafuel, could help with the pressure situation. I plan on running aftermarket rails capable of -8 feed. -12 to pump, -10 all the way up front then branch of to feed each rail with -8, return each rail to regulator with -8 returning back to the tank. Should be plenty of room especially knowing that the pump can be PWM.

Good knowledge here, thanks for sharing all this information.

 

[Northernregal]

Good to know, my buddy ran out of steam on his at 1024rwhp on e85. Wondering if his is a issue with plumbing. I planned on running a -8AN return as suggested by Magnafuel, could help with the pressure situation. I plan on running aftermarket rails capable of -8 feed. -12 to pump, -10 all the way up front then branch of to feed each rail with -8, return each rail to regulator with -8 returning back to the tank. Should be plenty of room especially knowing that the pump can be PWM.

Good knowledge here, thanks for sharing all this information.

Sweet baby Jesus. Thats a full send fuel plan lol. I'm not saying I disapprove, its just beefy, junk in the trunk if you will...

I think the difference between a 4303 that runs out low and one that does the rated 1400hp is injector. Running a 43psi injector vs a 58psi system will be huge under 20psi or more of boost.

 

[Burning]

Sweet baby Jesus. Thats a full send fuel plan lol. I'm not saying I disapprove, its just beefy, junk in the trunk if you will...

I think the difference between a 4303 that runs out low and one that does the rated 1400hp is injector. Running a 43psi injector vs a 58psi system will be huge under 20psi or more of boost.

I ran a similar setup on my 04 Mustang LS Turbo, with triple 455s in tank and it didn't have any issues with per cylinder injection or return problems. I ran -10 from the head and then Y'd to 8's there as well. Only reason im going -12 to the 4303 is due to the recommendation from Magnafuel in that regard.

Alot of the issues i see with peoples fuel systems is that they supply one rail into the other and then into the regulator, or they do a dead head setup which is not optimal for each cylinder to be same pressure.

 

[Northernregal]

Tried to get the trans done today, installing the Jake's D1 transbrake that is.

Got the pig out yesterday, despite thinking that pulling it forward off the crossmember would be quicker, it was not at all....

Either way, hoisted up to drain this morning.

It was right around this point that I discovered I couldn't find the trans clamp mount thingy I made last time I did this. So I had to make another one.

The new to me bandsaw got some real use, if you wan to do metal fab this is a great tool.

I cut 1/2" plate, the square tube, threaded rod and all kinds of stuff. Super happy with this acquisition.


Back in business, had to run out to get a set screw for the brake install and some ingredients for the turkey soup on the back burner in the kitchen.

Start ripping into this after dinner.

 

[Rktpwrd]

The new to me bandsaw got some real use, if you wan to do metal fab this is a great tool.

Glad to see you finally acquired one Duke. I’ll second that, it’s the most used tool in my shop only behind the air compressor and welder. Mine has served me faithfully for many many years now.

 

[Northernregal]

Fully disassembled. Need to find a drillbit for a 0.60" hole, a pump to housing seal and it can be finished.

 

[Northernregal]

transmission surgery complete. Kinda....

Tore the pump to case seal so gotta pick on up tomorrow to be finished.

But it is ready for trans brake goodness.

Had a conversation with Jakes Performance this morning, its their brake and I needed a few things answered. I discovered that I can run this full manual or full auto with nothing needed for reverse engagement. Thats kinda exciting.

Get a front seal from the trans shop tomorrow and this will be ready for install. Then I can start work on the cage install...

 

[motorheadmike]

Tore the pump to case seal so gotta pick on up tomorrow to be finished.

Hack.

😉