300ZX SETUP

[autobeast]

Hi all


I have just bought a 2d aquamist system to install to my 300zx twin turbo. After reading a write up on http://www.nissanperformancemag.com/january04/300zx/ , they used 2 jets at a size of 0.9mm

however the system they use was a s1 , is it best to use the same mm jet for the 2d system or use a smaller jet .

any help would be greatful


Thanks

Eddie

[mikec(nz)]

Some guys on twinturbo.net used 2 jets that were 1.0mm and said there seemed to be scope for bigger ones.

Check it out http://www.twinturbo.net/net/viewmsg...&msg_id=863290

[autobeast]

Cheers for that mate it was a great help

Eddie

[JohnA]

With the std pump driving two 1mm jets the atomisation might be less than ideal though.

Those guys on the site didn't lean the mixture either, so they didn't get anywhere near the power they could have got.
Actually they *lost* power (at the same boost level) but were happy anyway because the curve was smoother. Easily pleased... :wink:

[mikec(nz)]

I think the problem they had was using a non-adjustable ECU, so leaning it out would be a mission. A lot of them are using the "ASHSPEC" ECU now so that would give them the ability. I think they had a pump failure not long afterwards and didn't progress much more. Though other zx's seem to be running fine.

I'm trying to work out what set up I need for my 300zx. I want to do direct injection into the manifold, with a HSV (or multiple ones) controlled by my aftermarket ECU.

As the water tank is in the rear I wonder if a single pump will be sufficient to feed 6 nozzles.

Judging by the results on TTNet I suppose you would use six .3 or .4 mm nozzles but would doing it direct into the manifold require smaller nozzles as less water is lost in the intake tract/throttle bodies.

I was looking at the skyline setup and they used twin pumps, I presume this is because they are mounted in the rear.

Has anyone done something like this?

[JohnA]

Running four nozzles from a single pump might bring the effective water pressure too low for decent spray pattern.
I remember Richard some time ago saying that 2 jets are fine, as long as they are small or medium (not 1mm then)

I'm running 2 jets myself at the moment from the same pump, one 0.5mm and one 0.6mm (mine is an asymmetrical setup before/after compressors)

[ryan]

Hi Mike,

Ryan here from 300z club, if you want any help let me know, I've had water injection on my 300zx for a year now, it is good, have not dynod so dont really know what difference it makes hp whize, but sure seams to pull harder once you have leaned out the fuel curve.

I don't direct inject to ports though, I wanted a bit more intercooling for my setup.

with 440rwkw you prob will want twin pumps or a bigger one, erl is only 330ml / min and at 10% of fuel your going to be over that.

Cheers
Ryan

[mikec(nz)]

Hi ryan

Thanks for the offer,just trying to sort out how much my new ecu will be to control the wtare injections it supposed to have "3D mappable water or nitrous oxide injection".

Downloaded the demo software but does not seem to have it.

Well my plan is to run from the rear washer bottle, using twin pumps, 2 hsvs and accumulators and six nozzles injecting into the sides of the upper plemum

Still don't have everything properly figured out yet, not sure how to detect blockage, the G2 LINK ECU had dual fuel maps so I want to switch automatically between them when it is operating or not.

And have no idea where I am going to fit all that stuff, the engine bay is full and don't want noisy pumps in the hatch? Maybe biff the HICAS unit and that allows some space but I beleive the pumps have to be below the tank level so it gets trickier.

Any thoughts appreciated.

Cheers

MIke

[ryan]

Hi Mike,

With my setup, I have the water tank in the trunk, and the pump right next to the fuel pump controller (under backseat arm rest), with extra sound dampaning all over the under side of that panel, so the pump is lower than the tank etc.

I dont run a accumulator because the pump is in the back, so all the piping from the back to the front is basicly the accumulator (a good 2m-3m length in my case).

you could use a water flow meter (or 2 - the other pump) on the dash and keep an eye on it (prob the least you can do), I am planning of using a flow meter connected to my w/i controller so it will know if the flow drops from what It would normally be at that rpm/boost.

the 2 hsv sounds good, only other thing would be put a check valve(15 psi crack pressure) on the end of each nossle, this keeps good pressure (15 psi) in the line from the hsv to each nossle so your get a better spray at lower hsv duty cycles.

the 3d map stuff is ideal, so you can inject more at the high tourqe area's and more control over the injection, should get away with 1 output to drive them too as both sides should basicly be the same injection amount as long as the ecu can handle the 2 injectors on the same output line (should have load information in the documentation with ecu).

you really do want seperate fuel/timming maps for w/i running and not running. this is very ecu dependant. I do this with the stock ecu, but I have highly modded it, I use an external trigger - ie - a switch at the moment, but soon also with low water flow/level detection.

Hope thats some help
Cheers
Ryan

[autobeast]

Cheers for the feed back on this guys,

I have ordered another 0.8mm jet and im going to see how things turn out.
im going to be using 1 hsv then T peice it to the two jets. injecting it before the TB's

Eddie