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Injectors - where to now

Targa Tom

By Targa Tom,
in Engines & Forced Induction

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Targa Tom Proficient

Targa Tom

Posted
Posted

I am about to spend some hard earned on larger in jectors for my RB20DET.

At the moment they go to lunch (100%) at about 6200. This is OK as the engine doesn't hurt its self and we run it fairly conservative up top anyhow. However, we are giving the old girl her circuit race debut next month and this will mean much more WOT.

I want a drop in replacement, keeping in mind that she might be getting a 2.4 cubes to satify soon.

Thanks for your help

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TurboX Mentor

TurboX

Posted
Posted

Depending on how much power you plan to make should be the guide, but I think that RX7 hi impedance units flow 550cc and drop straight in.

The standard plugs will also connect as long as you cut the small plastic keyway from inide the inj. socket - takes a few min with a boxcutter. :D

At least this is what I have done to my RB20 and looking for 250kW which these inj. would handle.

Targa Tom Proficient

Targa Tom

Posted
  • Author
Posted

Thanks G,

I had heard the RX type were drop in's. I think the std ones I have are about 280, so 550 should be ample. We will run between 200 - 230rwkw I expect. Have seen 212rwkw, but thought we had better pull back a bit till we got a few things "safer"

I have no idea what the 2.4 will do, but I am mainly looking for mid-range anyhow..

Do you have a ball park on price for those injectors?

Tom

TurboX Mentor

TurboX

Posted
Posted
Why not go GTR injectors?My car idles and drives the same when it had the tiny RB20 ones.

http://www.skylinesaustralia.com/forums/sh...?t=34332&page=1

Tom, on reflection I think the above advice is probably best, as I have seen GTR Inj. for sale around $350 and I paid $110 EACH for my RX7's Used but Cleaned Etc. :Oops:

Two years ago it seemed reasonable but not now! :P

mist Community Regular

mist

Posted
Posted

i have a set of 550cc NipponDenso (blue) injectors that used to be on my RB20 with AP Eng Power FC. Was running a HKS GT2530, >200rwkw. Highest I ever saw the duty cycle reach was about sixty something % at WOT on circuit. Plenty of room for a bigger turbo. If running PFC and using low impedence injectors, u'll need a GT-R resistor pack. Don't think going the RX7 injector route is good - i tried before, had issues.

p.s. I'm selling both the injectors (only done 1500kms) and resistor pack on FS forums if anyone's interested :P

Sydneykid Grand Master

Sydneykid

Posted
Posted

Hi TT, we run the Series V RX7 Injectors, I had to buy 8 to get 6 good ones, good ones are had to find now. If you needed the extra capacity (560 cc's versus 420 cc's on our flow bench ) then it would be a better route that the GTR injectors. You don't need resistors to match them to the RB20 Power FC. The GTR injectors are good for around 265 rwkw, so they will suite your purposes perfectly. Get them cleaned and flowed as usual, there are variations as with all injectors. I always put the highest flowing one in #6, next in #5.

Hope that helps :D

blind_elk Grand Master

blind_elk

Posted
Posted

Why not buy a Malpassi adjustable regulator, and up the fuel pressure. You are probably running a bit under 3bar fuel pressure, I believe you can fairly safely run up to around 4bar.

Sydneykid Grand Master

Sydneykid

Posted
Posted
Why not buy a Malpassi adjustable regulator, and up the fuel pressure. You are probably running a bit under 3bar fuel pressure, I believe you can fairly safely run up to around 4bar.

The fuel pump is rated at 73.5 psi, if you run 4 bar (59 psi) fuel pressure that only leaves 14.5 psi for boost. I think TT needs more than 1 bar of boost. :D

Targa Tom Proficient

Targa Tom

Posted
  • Author
Posted
Hi TT, we run the Series V RX7 Injectors, I had to buy 8 to get 6 good ones, good ones are had to find now.  If you needed the extra capacity (560 cc's versus 420 cc's on our flow bench ) then it would be a better route than the GTR injectors.  You don't need resistors to match them to the RB20 Power FC.  The GTR injectors are good for around 265 rwkw, so they will suite your purposes perfectly.  Get them cleaned and flowed as usual, there are variations as with all injectors.  I always put the highest flowing one in #6, next in #5.

Hope that helps :D

Had always thought RX7 were the go... had read many forums in the past, but when you are doing other programs it is all information that wont fit on my nearly full hard drive (I had to forget my parents names so I could remember to change gears in a manual again).

Will start the search now...

TT

PS: Had some joy with dump skyd, even though deal not yet closed.

Sydneykid Grand Master

Sydneykid

Posted
Posted
Sorry for jumping in but SK did you say that with the power fc on a rb20 you dont need the resistor pack for the gtr injectors????, I may have read wrong tho.

Nathan

Hi Nathan either you read it wrong, or I wrote it wrong. You definitely need high impedance with the RB20DET Power FC, so if you use low impedance injectors (as in GTR) you need to increase the impedance. You can do that by using the GTR resister pack or by using individual resisters at the injectors.

Hope that clarifies :)

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