Need info on setup of secondary injectors

[marky210]

Hi guys

Ive been trying to search for info and pictures on the istalation of extra injectors into the runners on the inlet manifold of a NB8A but cant seem to find anything Ive got my turbo link computer back from AVO and i need to get the inlet manifold machined to accept my secondary injectors and need to know where exactly is the best place on the inlet runners to mount them

I have seen this a few years back but cant seem to find any info and pics anymore.

If any one has any pics of this setup and info i would really like to see them

Cheers, Mark

[Juffa]

Why not get some bigger injectors and use the Link ECU (piggy back I assume) to control them?

J.

[marky210]

Why not get some bigger injectors and use the Link ECU (piggy back I assume) to control them?

J.

The Link ECU which i am running will only run secondary injectors-up to 4 which when purchased with the AVO kit runs just the single injector before the throttle body.Pretty much as soon as the computer reads positive boost pressure it will bring on my secondary injectors while my factory injectors continue to run off the stock computer. This was the turbo link ecu that comes with the AVO turbo kit. The guys from AVO informed me that if i was to go with a full stand alone computer it would be a pain in the backside as the factory computer runs your altnator and a few other things that would need changing in order to make it work with a stand alone ecu. They also informed me that this setup works verry well and for me is the better way to do it as ive got everything already.

I just need to find the info on it and pics which ive seen of it done on several cars a few years back

Mark

[Fatty]

plenty of people are running bigger injectors on the nb8a, there are numerous ecu's and piggybacks to choose from other than the ones that AVO sell . plumbing in a second set of injectors seems like a massive headache to me. anyway if AVO are recommending this then surely they can give you the info of where to get the machinging done?!??!?!?!??!!?

[marky210]

Hey Fatty,

What I meant was AVO have seen great results with this setup and pretty much said it works well from the cars they have tuned with this settup. They only supply a single injector with this kit/ECU.

I was just pretty much told it would be a pain in the backside to run another computer. I do agree with you Fatty that it could be a massive headache and alot of work A path that i would love to avoid
Ive always really just wanted to run bigger injectors in the stock location as this makes the most sense and easiest way but was told it a pain

It would be great to hear what works well and easiest on a NB8A that people are already running

Mark.

[Rotary]

Anyone got any pics or Done it?

I'm interested in this method too, if the solution looks reliable enough, and not too cumbersome

[Woo]

Here are some of the 4 million pics of the extra injector setup.
I'm now running a fuel rail directly onto the injectors as the AVO injectors are commodore hose to rail units and limited to 32 lbs (~320 cc).
If you need more info PM














If your after a set of injectors and rail (as pictured) I have a set that came off my 10AE. No mounts though although these are easy to get from GM or s/h

Woo

[Woo]

Are you sure the alternator is regulated by the ECU in the 99 model?
I thought that only happened NB8B onwards

Woo

[Alex]

So hang on, whats wrong with the stock avo setup?

It just comes with an extra injector in the kit I believe

[Rotary]

If you're going to the trouble of putting in second injectors then you might as well go standalone. I thought secondary injectors are mainly for when you have so much power that a single big injector can't idle the car. But with an avo kit that wouldn't be the case. 460cc or 550cc would be fine and can still idle the car.
OR you could go down the FPR and fuel pump route.

So hang on, whats wrong with the stock avo setup?

Thanks woo Exactly what i wanted to see.

Sasso your absolutely right, ultimately the better solution for performance is a standalone, But for ultimate Driveability and economy, the stock setup is great, with extra fueling only for boosting.

For me the main reason is i have a fuel only Microtech ECU and rx7 injectors already, so if i can adapt it, to this setup, then that would be my cheapest reliable option.

[Rotary]

The stock ecu is nice but I'm not so sure about the stock setup having better drivability and economy. A well tuned standalone should beat it in both, but then that costs money to tune.

What exactly does the AVO computer do?

What would getting the second injectors put in cost? Unless its significantly cheaper then I'd be looking around for a nice ecu that does fuel and ignition, then you can use your rx7 injectors by themselves.

What boost/power are you planning to run?

Again i Agree with you, it would be expensive if you have to pay a workshop to do the work, and would need tunning too.
So I also wouldn't recomend it.

For me, its a bit different, as i do all the work(weld, tune, setup etc.) so with the parts i have would cost almost nothing.
its not as good though, as my preference is Power(relliably) not economy.

But your right even for me its not my best option, so i might take a diff approach (New Plenum )

[Woo]

You could always go full tilt !!
It should drive reasonably off boost with the 440 cc RX7 primaries, then on noise they are 4g63 DSM eclipse 550 cc secondaries retaining the VICS (it works better than any single stage plenum imo)
70 mm Throttle body

Good for 600+hp (without the 200HP shot of Giggle gas)





Woo