Forced Induction Anyone?

[Turk]

Nope Rb25's are side feed as well. Exact same injectors used in Sr20det's. CA18's are top feed. I beleive that most Rb25 drivers swap to top feed when upgrading injectors because it is alot cheaper than getting direct drop in side feeds.

[NiN^_^NiN]

280cc is the size of the millenia S injectors so i dont understand why u wanted the nissan ones besides being more easily available down here

[fredio54]

Originally Posted by sik_turk

Nope Rb25's are side feed as well. Exact same injectors used in Sr20det's. CA18's are top feed. I beleive that most Rb25 drivers swap to top feed when upgrading injectors because it is alot cheaper than getting direct drop in side feeds.

ok, well, rb20de uses top feed. wasnt aware that it was switched for that application.

get all the CCs you can. 280 is marginal anyway as discussed further up this thread.

fred.

[Fitzyb]

im pretty sure all RB motors are top feed, with the SR and CA being side feed's

[Turk]

The injectors the Nissan motors use and their sizes stock.

</B>
RB20 det uses top feed high impedance injectors 270cc
RB25 uses side feed high impedance injectors 370cc these are the same as the sr 20 det.
RB26 uses top feed low impedance injectors. 440cc
SR20 uses side feed high impedance 370cc injectors (same as rb25)
VG30dett uses side feed high impedance 370 cc injectors (same as above)
N/A engines I have not included these but are generally smaller than their turbo counter parts. rb30 e & et 250cc low impedance

meggala css master inject

Not exactly encyclopdia referance but it is all I could find. And I got a photo of the Rb25 ones I might buy on tuesday, and they are defiantely side feed.

Oh and they are 370cc, and I from what ive read 280cc is not going to be enough on my ZE with my turbo. Besides, Ive allready bought the rails . And the good thing is in the future I can easily upgrade to 500cc because as we know Nissan aftermarket is great

And I bought terminals and some 0 gauge wire. $15 a metre, ouch.

[Fitzyb]

Ah fair enough then, i have seen a few mod'ed rails for sale here and there, but they way more than the ol eunos 800m ones, for my use i wont need the extra cc's, mainly cause my engine is lower compression to the ZE. And 0 gauge? im assuming for the battery relocation?

[Turk]

Yerp 0 gauge is for batt relocate. Yer If I had the DE still millenias will be fine, but at 8psi I will be putting down alot more power with the 10:1 and will need that fuel.

I didnt get to finish relocate today. I got bracket done, drilled the box, ran the wire but it got dark so had to stop. Finish rest tomorow .

[fredio54]

fitzy, whats compression ratio got to do with injector sizing? not a lot.

sik, you are in oz, oz (smartly) is metric, what the ? is 0 guage? i used both a ground and power run in 50mm2 welding cable for heat resistance and ruggedness. starts like never before :-)

http://images.trademe.co.nz/photoser...29268_full.jpg

they do indeed appear to be sidefeed, but, that picture sucks...

fred.

[Turk]

I used to work at Lifestyle car audio and ive never used or heard anyone use mm's in wire widths. Like how we still refer to rims in inchs .

0 gauge is the biggest audio wire you can get, fat mofo.

http://i158.photobucket.com/albums/t...t_injector.jpg

the Rb25 injector. Looks 1 to 1 like the Sr20 ones.

And Fredio, you obviously know alot more about this, but I figured that seeing as I will be running 8 psi on my 10:1 ZE, making say roughly 200kw, and if I was to run 8psi on a DE compression (9.5:1?), making say roughly 170kw, wouldnt I need bigger injectors on the ZE due to the more power and more fuel I will need?

[Fitzyb]

fitzy, whats compression ratio got to do with injector sizing? not a lot.

Higher compression means harder to boost, means needs to be run richer to keep it from going pop, so i say that having higher compression, at the same boost level, will effect the number of cc's your going to need, cause your going to require an increased flow of fuel

[fredio54]

Originally Posted by Fitzyb

Higher compression means harder to boost, means needs to be run richer to keep it from going pop, so i say that having higher compression, at the same boost level, will effect the number of cc's your going to need, cause your going to require an increased flow of fuel

drowning it in fuel and retarding the ign to [shizzle] will usually lose you the extra power that the extra air might have brought. you might well be better off with less boost and a more sane compression ratio. also, the temperature of the air you are injesting makes a big knock difference.

at the end of the day, you do not want to go richer than 10:1 and leaner than 12.5:1 on any boosted engine running gas (ratios are different for other fuels)

you should size your injectors on airflow and 11:1 or similar regardless of that compression ratio. with higher compression and same octane, airflow will need to be lower to keep exhaust gasses a sensible temperature...

hope that helps clear things up or muddy them a little maybe.

fred.

[fredio54]

Originally Posted by sik_turk

I used to work at Lifestyle car audio and ive never used or heard anyone use mm's in wire widths. Like how we still refer to rims in inchs .

0 gauge is the biggest audio wire you can get, fat mofo.

audio != industry. i was going to say something like "audio is the only place where guage is used frequently" maybe other than america... and any countries that might be trying to be in their back pocket ;-) joking. dont hammer me... please. square mm counts. guage is about the outside of the whole thing, and thus one with thick insulation and or loose windings will have less copper than another. be careful with that audio [shizzle], the insulation on it often isnt up to the task...

And Fredio, you obviously know alot more about this, but I figured that seeing as I will be running 8 psi on my 10:1 ZE, making say roughly 200kw, and if I was to run 8psi on a DE compression (9.5:1?), making say roughly 170kw, wouldnt I need bigger injectors on the ZE due to the more power and more fuel I will need?

all things being equal, you will make more power on the lower comp engine with boost. things arent equal though, so for say 10psi of boost, you might make similar power, or more on the ze depending on how good the setup was etc.

roughly though, consult ms injector chart, mulitply engine displacement by pressure ratio by 100 and choose based on that. so, 1.6 * 2.5 * 100 = hp

for a 6 cylinder, its roughly CC = hp so you want 400cc injectors. 370 is close enough, and without [shizzle]loads of mods, you wont see that max figure anyway. you can just tune and watch, and if you see duty too high, you can just buy bigger ones, and carry on. its not critical unless you ignore the fact that its running out of gas...

fred.

[NiN^_^NiN]

Every ZE that has been turbo'ed on PT has made more power than a DE with the same amount of boost.

The ZE is a better design it will push out more power compared to a DE you can't compare a DE and a ZE as the same with only the compression being different.

That being said ZE's with any type of FI need to be tuned properly and precise as they tend to crap it if not tuned just right its why most people go with DE you lose some of the power of the ZE but you don't have to worry as much.

Still in the end ZE Turbo > DE Turbo

[Mr. MX6]

I figured the duty cycle and fuel pressure on the injector is going to have more to do with the amount of fuel going into the cylinder than the actual flow rate.. In as much as you can adjust it infinitely variably.. does that make sense?

So yea I went with the millennia ones on my set up ,, but if it was the correct decision remains to be seen.. no matter if not as i got them for a song on ebay..

Besides they fit in “more stock looking”.. no officer.. it is supposed to be like that…lol

Hey fizzy can you whack up a good pick of my motor .. im beginning to miss it..lol

Oh and I used zero gauge… mainly coz I have relocated using smaller and it always sounded as if it was slower to turn over the motor.... also it looks way cool...
As to the name.. I think it is more to do with the fact that it is an audio/automotive cable as it is a multy strand..
Like a standard 10mm or what ever.. is only 7 strands ..but if you ask for zero gages you get well what we all know as zero gauge.. but that is just a guess..

[jmoore]

from wiki
Wire gauge - Wikipedia, the free encyclopedia

Wire gauge is a measurement of how large a wire is, either in diameter or cross sectional area. This determines the amount of electrical current a wire can safely carry, as well as its electrical resistance and weight per unit of length. Wire gauge is therefore applicable to both electrical and non-electrical wires, thus it is important to electrical wiring and to structural cable.