I didn't really put any thought to how beanman would've wired that, but I'm guessing the additional injectors were in series with a couple of the "normal" injectors, but switched to only be in the circuit above 7psi. This may be able to be done in parallel also since the addition of a high impedance injector wont have a huge effect on the already low impedance injectors being used.

 

works good
I use a hks stand alone injector driver.

 

Injector driver for the thrifty with too much time on their hands:

http://www.200sx.org/diy_aid.html

 

I did just wire them in with the other injectors, they were wired parallel. I was using a Megasquirt and all of the injectors were low impedance.

 

I have a buddy that did everything the simple way when he had a 9 second GN. Had aftermarket injectors but ran a chip with factory electronics, had two additional injectors, launch car, shift second, turn on injector, shift third, turn on injector, cross finish line, click OD and turn off injectors.

 

I do this already with a MS3, but I have 20 injectors. 8 gas, and 12 e85 that get switched to under boost.

also 034 motorsports has a supplemental injector driver box/computer

http://www.034motorsport.com/034efi...s-supplementary-injector-controller-p-71.html

But I would definately not spray fuel in front of the turbo inlet, after the turbo we have done on acouple cars, and that works well, but in front of the turbos seems too easy to puddle fuel somewhere not protected against heat or sparks.

 

this is what you do, I've done this in the past and it was cheap, effective and foolproof, buy a dc-dc optically snubbed solid state relay on eBay for 10$ an trigger it from one of your injectors at 1+lbs of boost by means of a hobbs switch then the computer still has full control over pulse width, you won't burn out the drivers in the computer and you can run any size or ohm injector because you'll be powering it from a 12v hot source....

 

Does it have to be dc-dc? I'm kinda liking this one: http://www.ebay.com/itm/Opto-22-Sol...803?pt=LH_DefaultDomain_0&hash=item5d34fe170b
If not will this work?: http://www.ebay.com/itm/1pcs-Soild-...512?pt=LH_DefaultDomain_0&hash=item3a77cfb660
Or is the heat sink needed also?: http://www.ebay.com/itm/10A-DC-DC-S...431?pt=LH_DefaultDomain_0&hash=item51a209315f

 

yes dc to dc, because your using the dc circuit from your injector driver to trip the dc circuit from the battery to the injector, they are cheap and they have super fast response times so there is no reason not to but one

 

http://item.mobileweb.ebay.com/viewitem?itemId=360521546774&index=17&nav=SEARCH&nid=97651825288

 

now say this is a carb app with no signal to steal- anyway to have a spark sensing circuit that went around a plug wire to induced a current and trip that relay?

 

Years ago, I used a system from http://www.alkycontrol.com/ on an 87 Buick GN, and it would make 28~30 psi on 89 octane, knock free. It was amazing to me.

 

If you wanted to add more than one injector would you need another relay for each injector?

Jess

 

Might be a little touchy with low impedance injectors since normally they're fed full power 2-5amps only for the first millisecond or so, and then the injector driver pulls that back down to 1amp just to hold it open. This also answers that, depending on your injector impedance and the amp handling capacity of your solid state relay, you can run a number of additional injectors off of one relay.

 

I would probably use a few high impedance injectors that I already have. I have 42s in the car now. If I could add a few 24# injectors for little money I might try it.

Jess

 

so say you wanted to run a dual fuel set up with some high impedance injectors you could have these triggered from the stock injectors and be turned on when boost came in

 

That is what I was thinking. I should buy bigger injectors, but I don't want to spend the money. Adding a few injectors would be a good solution. I run a single plane carb style intake with injector bungs, so I was thinking I could get a carb spacer to mount the injectors in.

Jess

Jess

 

one step ahead of ya- might have to use a billet spacer this one is just a cheap twenty dollar one I drilled out had massive porosity's that an oring wouldn't seal on #ad

 

So, it looks like you are adding a 9th, 10th, 11th, and 12th injector.

What are you going to use or a fuel rail?

Jess

 

actually might try this as a swap to efi and put 8 in the plate