Nissan ECU Tuning

Tektrader69 · Joined: 12 Feb 2005 Posts: 17

Can someone please point me in the right direction for information about adding extra injectors rather than changing stock ones?

I have a Z32tt and want to add 2 720cc top feed injectors and leave the stock ones in place on the lower plenum.

Thanks in advance.

Graham

SSS · Joined: 16 Jan 2005 Posts: 6

this isn't a very good idea as it can lead to lean/rich conditions in the cylinders if the extra fuel is not distributed evenly.

The best solution is to add an extra injector per cylinder, at the start of each runner. I am doing this on a set of quad throttle bodies on my KA24E; using the stock 240cc injectors in their stock placement and a set of 460cc injectors in the runners just after the throttle plates.

Lew_ecu · Joined: 05 Feb 2006 Posts: 17

I am working with someone to do just this. They have a remote mounted turbo (rear) and the plan is to inject an additional injector also in the rear. The long path to the intake should ensure proper mixing.

The injector will be PWM and controlled through a boost sensor that feeds a signal to vary the PWM in relation to the amount of boost.

cb_drift · Joined: 04 May 2004 Posts: 472 Location: New Zealand

how laggy is that design? i saw something like that on rides on discovery one time and thought it had to be a lag monster due to the intake pipe run and the distance from the engine the exhaust housing of the turbo was...
are they even worth the cost of the install for the lag/power increase?
yeah - i know its gotta be done there to pass the emissions laws n stuff tho - just curious if its as bad as i think it would be tho...

Lew_ecu · Joined: 05 Feb 2006 Posts: 17

He has a VG30e car with a T3 turbo and he says it hits pretty hard.

A major consideration is the diameters of both the exhaust pipe to the turbo and the return boost pipe also The exhaust pipe should not be greater in diameter than the turbo pipe of course.

Since his car has a 3.90 rear, it does have lag just due to that. But the actual cost, installation ease and time is very attractive. So are the other benefits like a cooler running turbo, long oil lines (like a built in oil cooler)

Edit: He sourced most parts online, second-hand, etc. his total costs were probably in the hundreds and not thousands. The actual STS turbo kits are expensive.

A major mistake would be putting too large a turbo on. Going conservative is always a good consideration. Putting this on a 4 cyl car might mean going to a very small turbo. But considering the hassle of turboing V6 and V8 cars, its an attractive alternative.

tarmac- · Joined: 29 May 2006 Posts: 106 Location: New Zealand.

old post, yep.. but:

hows the oil return work? does it have some sort of pump to get it back to the engine?

i would have thought that as the exhaust gases cooled, they would become more dense so the lag shouldnt be to extreme?

Lew_ecu · Joined: 05 Feb 2006 Posts: 17

http://www.club-s12.org/forums/index.php?showtopic=8278&st=120

Check his car out here.

Also, check out STS squires website. They sell a kit but anyone could do this with junkyard tech.

dsagers · Joined: 25 Dec 2006 Posts: 1