More than 4 Injectors?

[MXD]

Hey everyone, im new to this forum but not to the DSM's. Hope you are all doing well. Anyway, done with the longblock building up, but i was interested in having two auxilarry (sp?) injectors sitting at the bottom rear of the intake manifold. I want to keep the head wet with 25+ pounds of boost. Has anyone experienced a good way of controlling those two injectors without going the haltech or Wolf computer way? Thanks guys

 

[defrag010]

There are a buttload of companies that make Extra/Additional Inector Controllers (AIC, EIC). 034 efi, greddy, blitz, megasquirt, etc, etc..

 

[dsm10sec]

How are you making sure that cylinders are getting the fuel evenly if you're mounting it in the back of the manifold?

 

[dls93tsi]

Im assuming he means the back of the runners

 

[MXD]

Im assuming he means the back of the runners

Yeah im getting the rear of the runners machined to accept four smaller sized injectors to spray when the turbo has spooled. Just wondering whats the best fuel programs to use.

 

[1Gguy]

The Greddy Emanage is probably the cheapest route.

 

[MrDSM]

Yeah im getting the rear of the runners machined to accept four smaller sized injectors to spray when the turbo has spooled. Just wondering whats the best fuel programs to use.

interesting idea, for fuel economy?

 

[anconover]

So you plan on running only 2 injectors in 2 runners? What about the other 2 cylinders?

 

[12's]

It would work best with aem. I am planning on using 450's for primary off boost and add 1000cc injectors for wot

 

[Mirage2LTurbo]

Gas mileage is going to be worse, tuning is going to be 10x harder, you're going to have to set engagement points. Just get 4 big ones and be done with it.

 

[JiveMasterT]

whats the point of this?

 

[Blizz92tsi]

I originally thought about doing something like this. My plan was to run 4 extra injectors on the back side of the runners on a sheet metal intake manifold. The regular (primary) injectors were going to be 660s and the secondaries (on the back of the manifold) would be stock 440s. This would give you 1100 ccs worth of fuel and would be easier to tune than 1000cc + injectors. The 660 primaries would allow you to run a good amount of boost on pump gas, and the secondaries would be used to inject race gas when boost beyond pump gas was wanted. The secondaries would be fed from a seperate fuel cell, pump, and possible pressure regulator. You could also always run race gas in both tanks if desired. A problem I ran into was going to be mangement and tuning. This was also going to be on a previous car that in the end got stolen! So the plan never got any further. The other problem is this is a modification for someone with lots of support mods already done.

 

[bastarddsm]

whats the point of this?

Becuase when you get huge injectors the pulse width at idle has to be so small that the injectors don't operate properly.

 

[Mirage2LTurbo]

Becuase when you get huge injectors the pulse width at idle has to be so small that the injectors don't operate properly.

Sounds like you really know what you're talking about. I idle 1700cc injectors on my 2 liter at 750rpm at 14.7:1 a/f. I've gotten it to idle lower at the same a/f, but it gets choppy with the big cams.

 

[bastarddsm]

do you cut you fuel pressure at idle? god those are like 150lb/hr injectors.

 

[MXD]

The primary purpose is for idling characteristics and for a larger amount of fuel for the 25+ pounds of boost the engine is receiving. Trying to keep the head wet will help with frying the rings or other harmful problems

 

[anconover]

Theyre is no need for that kind of setup for 25psi. I run 24psi on pump, on 680cc's...

Ive now got 880cc's with a keydiver chip, car runs perfect.

 

[dsm10sec]

I have 750ccs with MAFT and my car idles perfect at 750-850. (NO ECU MODS)

 

[Blizz92tsi]

I was originally trying to come up with an innovative way to get race fuel delivered when pump gas wasn't going to do it alone. But with things like key diver, MAFT, and other tuning advances I don't think its necessary. I still like my idea. I just don't think its worth the time, effort, money, and tuning when there's much easier options.

 

[ZyklonBZombie]

So you plan on running only 2 injectors in 2 runners? What about the other 2 cylinders?

i think he wants to run 6 injectors ... i know of a guy hear that was going to do that use the factory 450s on his 2G gst and use to like two 1000s as secondaries ... but he moved away and works at jotech now (at least that is what the rumor is)

 

[defrag010]

Sounds like you really know what you're talking about. I idle 1700cc injectors on my 2 liter at 750rpm at 14.7:1 a/f. I've gotten it to idle lower at the same a/f, but it gets choppy with the big cams.

are you on the stock ecu? or standalone?

 

[95GSXBLUR]

Sounds like you really know what you're talking about. I idle 1700cc injectors on my 2 liter at 750rpm at 14.7:1 a/f. I've gotten it to idle lower at the same a/f, but it gets choppy with the big cams.

OK, i gotta ask, you have all this stuff done to your car and you run a : 12.131 @ 131.670 1/4 mile? 1700cc injectors for what? I know a dude that runs 11.9 on RC550s! don't get me wrong either 12.1 is very fast too.. and i totally respect you for that.. i guess i'm confused on your motives on such huge injectors.

I'm not trying to be a d**k by any means, and this is definitely off topic. Why in the world, would you run such big injectors, and for all you guys that run more than 750's for what? i'm pretty sure that Buschur took his car in to the high 9s or low 10s on 660s.

i think everyone is missing the aspect of tuning and just thinks that more fuel is better.... how about proper tuning is better.

 

[MNGSX]

I have seen 539 awhp pump gas on 780cc injectors... Just get 780's or 1000cc if you have a monster turbo. EMS can run them just fine. I have 1680s but that is because I run ethanol so with that fuel it is like running 1000cc injectors.
The BR conquest with what ever a BR680 turbo is runs 1680's with race gas but it is a single digit car.

 

[Mirage2LTurbo]

Same price, bigger injectors, might as well get the bigger ones. I have considered running meth, so might as well have hte injector there if I need it. I run 33psi base. My point posting in here was just to prove that with the right engine management, you can make it work. I run Autronic SMC standalone.

 

[Maglin]

Yeah if you plan to run straight Meth those 1600cc injectors are almost not going to be enough on the upper end and might lean out. Alcohol though would be perfect for them I believe... BTW Mirage... I love your car... You have one sweet fuel system... But what is your 1/4 run at 15 PSI???