TT402LS1

iTrader: (5)

I will be running E85 on my motor (see sig) I was thinking I would need to run 8- 160lbs injectors. My question is, would it be more streetable or tunable with 16 injectors? like 8- 84's and 8- 60,s??? HP level around 1000 flywheel.

Thanks - Ron

gametech

iTrader: (1)

Unfortunately, your question is irrelevant until someone markets a dual stage 2 injector per cylinder staged fuel control computer. If the injectors are staged, then you would be much better off. However, if the injectors are all fired constantly, you could at best only be equal to 8 larger injectors.
edit-- subsequent posts indicate that the fuel control computer you need IS available, so disregard this post.

qqwqeqwrqwqtq

BS3 offers staged injection, and yes, driveability would be better with 16 injectors, 8 of them being smaller primary injectors, as compared to just using 160's.

Nate81Camaro

160lb injectors! Hello .1 mile per gallon

ls1king000

iTrader: (20)

-don't mean to highjack-



I want the staged injection upgrade for my BS3, how much do you think for an upgrade about?

I have the bs3-004-004 (ls1-DAI-no trans) already.


Also I have 96lbs and I'm thinking those are pretty big for primaries. I was considering motron 60's for both stages.? I'm looking for 1200+ crank, 93 primary, c16 secondary. I will be using the gmpp carb intake for this setup as well.

Would a boost-reference regulator work well on the primary system?

qqwqeqwrqwqtq

I'm not sure if you can upgrade, you might need a whole new box. You could use 2 sets of 60's and a boost referenced fpr would be used on both fuel systems.

HUNTER02SS

iTrader: (24)

Here is the solution to your problem and it work's great. Use the 16 injector's like you want. Run the first 8 off of you regular computer and then for your next 8 injector's go to this website www.splitsec.com and call them. They sell secondary injector computer systems that work directly off of boost. It is real inexpensive and you can have the extra set of 8 injector's turn on at a certain boost level. It has software for it also and is fully programmable. I am using there setup for my extra set of 4 injector's I have. This way I will also have a high and low boost setting. Hope this helps.

TT402LS1

iTrader: (5)

How much work is involed in upgrading in intake to accept 8 more injectors? Do they sell bungs to do this? Does a sponsor here do it?

Thanks - Ron

HUNTER02SS

iTrader: (24)

If you have a local fab shop they should be able to do it. Summit sell's injector bung's I think. If not any of the sponsor's should be able to get them for you.

qqwqeqwrqwqtq

I've done it on a carb manifold. I can check on the cost

ls1king000

iTrader: (20)

I have bored the injector bungs for my carb intake at my work. It wasn't that hard in a bridgeport. I am more worried about the second rails because I have to make up the fuel rail mount which is just going to take time to get it right. I've bought a set of bungs and now need to again bore the manifold and weld the bungs in. Wanted to try and do this myself but, don't want to F up my beautiful mani.



Jim, I wish I could find an older thread where I thought you said something about your old TT that had combined return lines and a diverter valve, check valve and some other stuff?
Can't we just run each systems return line, completely separate

qqwqeqwrqwqtq

Yes, I ran 2 completely separate fuel systems with their own return lines.

The post you're remembering is probably when I was having the idea of running 2 fuel tanks so you could just supply the same rails with race fuel by flipping a switch. After testing I decided the delay was too long to clear the rails of pump fuel so I went with the staged injection.

ls1king000

iTrader: (20)

Yea that's the one. So it's just a Hobbs switch to activate the second fuel pump just before the secondary injectors go into action?

qqwqeqwrqwqtq

No, that would be too much delay, you would never have pressure fast enough.

I ran the pump for the 2nd set of injectors off of a step-down box so there was always pressure in the rail. Any amount of boost would trigger the hobbs switch to put full voltage to the pump.

Either that or you could just run it continuously.

ls1king000

iTrader: (20)

Okay, I didn't really know what a hobb switch was lol, thanks. like a voltage regulator controlled with just boost


running it continuous sounds simplest and then of course there's longevity of the pumps life.


*run down of my setup;
*EDIT*

primary fuel system

---------------------
-walbro255, -6an feed, return

-aeromotive pro efi boost ref. 1:1 regulator (30-60 psi)

-precision turbo and engine 24# injectors (high imp)

-aluminum sumped stock tank 15 gal, pump 93




secondary fuel system
-----------------------

-dual walbro255, -8an feed, return

-aeromotive pro efi boost ref. 1:1 regulator (30-60 psi)

-precision 96# injectors (low imp)

-7 gallon tank, 110 unleaded

-hobbs switch




Other
----------------
BS3, Carb intake modified for 16 injectors

Still can't make up my mind about which pump to go with. Magnafuel, weldon, walbro ??

qqwqeqwrqwqtq

Oh, sorry. A hobbs switch is just an adjustable pressure activated switch.

I was using a hobbs (pressure) switch to control the step down box. Basically the 2nd pump was on continuously running with around 9volts. The hobbs switch closes under positive manifold pressure triggering the step down box to send full vehicle voltage to the pump.

I wouldn't worry about pump longevity as it would be running for the exact same amount of time as your primary pump.

ls1king000

iTrader: (20)

Gottcha Thanks for explaining.

SuperZ

iTrader: (2)

Is it hard on anything to run both of your intanks all the time?I was curious on if people did that or usually activated one with the hobbs.

ls1king000

iTrader: (20)

From what I understood from Intmd8 is the second pump runs all the time. It's voltage is lowered with a step down box which lowers the second pump to around 9 volts. The Hobbs switch will signal the step down box to let the second pump run full voltage when manifold pressure is present (boost). Far less work for the second pump to do instead of being on/off, that takes to much time.

Now that I understand how a Hobbs switch works, why do we want this if not for pump life?
noise?
something with pressure?

qqwqeqwrqwqtq

The advantage to turning on a 2nd pump with a hobbs switch, or running the pumps at reduced speed is less heating of the fuel due to recirulation.

If you're constantly flowing enough fuel for 1000+hp you're adding a signifigant amount of heat to the fuel which is unnecessary when you're just cruising around.

It's not going to cause any problems but it is something to consider.