Efi

[DButler]

I am looking to switch to efi on SBC it is twin Turbo. I currently have Carb with 10 an supply return and a1000 pump. I can't afford a complete kit I want to piece one together slowly what all is needed. I have Msd pro billet distributor.

[MrForce]

How much HP do you want to make?

[DButler]

Current hp levels is only 500-550 at wheels. I would like to make around 750 rwhp when I build a new motor.

[Ollie8974]

I would recommend MegaSquirt The MegaSquirt is a kit that you assemble, and tune with a laptop computer. The forums are well supported.
Sorry for the double post, Mods, this post can be removed.

[Ollie8974]

I would recommend MegaSquirt The MegaSquirt is a kit that you assemble, and tune with a laptop computer. The forums are well supported.

http://www.msextra.com/forums/index.php?sid=b4fe138119386deec0112a6a1c5d28ad

Kits can be purchased here.
http://www.diyautotune.com/?gclid=CKf80uewtaYCFQRubAodjHdbJA

the car already has a # 10 fuel system that will be OK. The pump will have to have an output over 50 psi. add a vacuum or pressure referenced regulator.

[DButler]

I am about to pull the trigger on a holley hp efi retrofit kit. My question is on fuel. I have system supplied and returned with -10 line. I have -10 in to regulator with one -8 feeding carb now and with a -10 returning. Can I keep my system the same way it is with fuel rails. like loop rear rails together and put a tee in one rail at front and put feed and crossover line in front rails and return from regulator. If not how would I return from rails?

[RSX302]

I am about to pull the trigger on a holley hp efi retrofit kit. My question is on fuel. I have system supplied and returned with -10 line. I have -10 in to regulator with one -8 feeding carb now and with a -10 returning. Can I keep my system the same way it is with fuel rails. like loop rear rails together and put a tee in one rail at front and put feed and crossover line in front rails and return from regulator. If not how would I return from rails?

-10 return to tank? that's huge...I'm only running a 3/8 line (-6 return) with a -10 supply. -10 supply split into two -6's (one for each rail) return opposite side of the rails -6 to a 2 inlet one outlet regulator back to tank. Stay away from looping with higher HP.

also I'm partial to Accel and Fast.

[DButler]

I couldn't really find anything on the Accel. A friend of mine runs the xfi in his 2200hp race car and his firend runs holley in his. he said that he liked both. I have read reviews on the Holley and decided to go that route. On this motor I am being conservative and only making aroun 500-550. I have plans to build a 383 turbo motr shortly. Then I am hoping to push around 700-750. Brett at Aeromotive said I would be deadheading at the rails the way i want to run. The reg. that comes with my kit has an inlet an outlet and a return. Holley tech said it should be fine. Also I was told by Brett that -10 return would be fine. I didn't think you could get return to big? I had extra material that size is the reason I went that route. I am a little lost on the deadheading issue. How come the fuel rails would not alway stay pressurized even if you feed after the regulator? Also is -10 return too big? Also i had a 3/8" return and it wasn't big enough for the A1000. it wouldn't let me regulate the pressure down.

[RSX302]

I couldn't really find anything on the Accel. A friend of mine runs the xfi in his 2200hp race car and his firend runs holley in his. he said that he liked both. I have read reviews on the Holley and decided to go that route. On this motor I am being conservative and only making aroun 500-550. I have plans to build a 383 turbo motr shortly. Then I am hoping to push around 700-750. Brett at Aeromotive said I would be deadheading at the rails the way i want to run. The reg. that comes with my kit has an inlet an outlet and a return. Holley tech said it should be fine. Also I was told by Brett that -10 return would be fine. I didn't think you could get return to big? I had extra material that size is the reason I went that route. I am a little lost on the deadheading issue. How come the fuel rails would not alway stay pressurized even if you feed after the regulator? Also is -10 return too big? Also i had a 3/8" return and it wasn't big enough for the A1000. it wouldn't let me regulate the pressure down.

Lots of things to consider. With your carb set-up and lower HP, the A1000 is a lot of pump and the -10 return is needed for all that fuel returning to the tank to maintain the lower pressure. In a FI set-up at ~45psi, I have the A1000 with a -6 return with no problem maintaining pressure. Not saying that the -10 return is a problem, just will be overkill in an FI set-up. Your current set-up probably heats up the fuel nicely. For that I purchased the Aeromotive pump controller. Cuts the pump in half during cruise.

If you put the regulator before the rails and bypass to the tank, then the rails will dead head. In your case, thats the way you set up the carb. The FI set-up will/should have the regulator on the outlet of the FI rails so no deadheading.
Looping rails with a reg back to the tank is no problem with 500hp, but it's a death sentence with 1000hp. Feed the monster!
With looping,think of it like feeding the motor with one -6 (3/8") feed.

See Aeromotives instructions for carb vs EFI.
http://aeromotiveinc.com/wp-content/uploads/2011/10/11101.pdf

[DButler]

Yeah I understand it better now. I am going to go ahead and go with a Y block and feed rails and then exit rails into regulator on each side correct? and just return from bottom back to tank as normal. I spoke with Brett at Aermotive and he said -10 will be fine as a return so I am just going to leave it in place. I am going to come into the y block with -10 leave y block with two -6 into the fuel rails. I am then going to leave fuel rails with -6 and go into each side of regulator and then leave bottom of regulator with -10. Does this sound right? Is -6 enough to feed each rail? I want to go ahead and prepare for future motor. I could leave fuel system as is for now but would rather go ahead and fix it. Also going through and leaving the rail is a constant flow of fuel so it helps keep fuel cool correct? Deadheading causes fuel to heat? So if I decided to leave as is it would be fine for now? What would you do and also I am thinking about mounting ECM in glove box. Where did you mount yours, have any pics. I want to mount it where it will not be a pain to route the harness.

[RSX302]

Yeah I understand it better now. I am going to go ahead and go with a Y block and feed rails and then exit rails into regulator on each side correct? and just return from bottom back to tank as normal. I spoke with Brett at Aermotive and he said -10 will be fine as a return so I am just going to leave it in place. I am going to come into the y block with -10 leave y block with two -6 into the fuel rails. I am then going to leave fuel rails with -6 and go into each side of regulator and then leave bottom of regulator with -10. Does this sound right? Is -6 enough to feed each rail? I want to go ahead and prepare for future motor. I could leave fuel system as is for now but would rather go ahead and fix it. Also going through and leaving the rail is a constant flow of fuel so it helps keep fuel cool correct? Deadheading causes fuel to heat? So if I decided to leave as is it would be fine for now? What would you do and also I am thinking about mounting ECM in glove box. Where did you mount yours, have any pics. I want to mount it where it will not be a pain to route the harness.

Yep..exactly.. If you get a 1/2" NPT Y block,(unless you find 1/2 in and 3/8 out) you will do a -10 x 1/2NPT fitting inlet and two 1/2"NPT x -6 outlet. Perfect going to each rail. -6 x 3/8" in/out going to the two in one out regulator with the same fittings. (all 3/8" NPT on the reg) You will need to get a step up fitting from -6 to -10 to your return line.

Other than engine temp--excessive pumping is the main cause for the fuel to heat up. Deadheading does not cause heat-up, just makes more prone to vapor lock.

My ECM is behind my center gauge cluster under the dash. Anywhere easy away from the elements..(Heat, Water..etc)

[DButler]

I have been thinking about this (Oh no!) lol I was wondering instead of feeding each rail and exiting each rail could I come from my main line coming out of pump with a -10 and feed one fuel rail, loop rails at back come out of the front of the other fuel rail and go to the regulator. Plug other side of regulator and return out of bottom as normal. I was thinking I could reduce down from -10 main line to a -8 and feed rail and go to reg. with -8 as to were before i was going to run two -6 lines. Would this not be the same as feeding each rail?

[RSX302]

I have been thinking about this (Oh no!) lol I was wondering instead of feeding each rail and exiting each rail could I come from my main line coming out of pump with a -10 and feed one fuel rail, loop rails at back come out of the front of the other fuel rail and go to the regulator. Plug other side of regulator and return out of bottom as normal. I was thinking I could reduce down from -10 main line to a -8 and feed rail and go to reg. with -8 as to were before i was going to run two -6 lines. Would this not be the same as feeding each rail?

:hmm: :confused:

What is the in/out threads on your rails? 3/8"NPT?

If you only feed one rail with fuel, and "loop" out the opposite side to feed the other rail, you will be limited to that rail size fuel volume to all injectors. Not exactly sure the limits of a series (looped) set-up, but I'm thinking 500-600hp would be close. A parallel feed (split -10 into two -6's) is highly recommended for the higher power levels you want to achieve. Do not cut corners here or you will be sorry later. Ponies are thirsty, let them drink.

[DButler]

yeah I agree. I have already dropped this much on EFI whats a little more on fuel lines lol