Injector sizes? What cars to get them out of?

Discuss the RB20, RB25 and RB26 series engines.
DriftNGo
Posts: 43
Joined: Wed Sep 30, 2009 6:47 am

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Power goals are 325-350whp @15lbs boost

Here is the set up as of now:Rb20detFMICRb25 TurboK&N Filter3" turbo back exhaustWalbro 255Nismo FPR

Here are the planned upgrades N62 Maf or P60 (Q45)GT 3071R, 84 Trim, .064 A/R To help avoid any lag issuesLarger Injectors 440cc or bigger (what vehicles can I find with top feed high impedance injectors?)Lightweight Flywheel One peice Aluminum Driveshaft (need to cut down on rotating weight)Upgraded ClutchNistune Board

I don't want to go crazy with the money as I am doing this on a budget so salvage parts are always a plus thus the basis for the post.

What vehicles can I find with 440cc or larger injectors that are going to be a direct fit?

What kind of power should I be putting down with current setup @14psi? (yes I know this is a little high based on the ceramic wheel and the stock injectors)

Are these kind of numbers325-350whp feasible with the planned mods from your experience?

Modified by DriftNGo at 4:53 PM 9/30/2009
Modified by DriftNGo at 4:54 PM 9/30/2009


Bluefire
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Joined: Fri Jun 06, 2003 6:07 am

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RB20's and RB25's run t3 turbos, so you'd be looking at a GT3071r and I don't know if they even make .58 a/r...

Don't even worry about a lightened flywheel or driveshaft. Technically this would make the turbo spool slower since theres less load on the engine.

As for injectors, easiest 440cc injectors to find are 7mgte injectors or RB26 injectors, but both are low impedance and require a resistor box. I don't know of any 440cc top feeds that are high impedance

DriftNGo
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Joined: Wed Sep 30, 2009 6:47 am

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Yeah so looking back at my notes, it would be the gt3071r. Question on spool though, at what RPM should I expect a full spool from a 90trim,.086 a/r, and a 84 trim, .064 a/r?

I want to hit full boost by 4k. Of corse the 90 trim would be able to make more power but I am trying to avoid lag.

The minute difference is spool time from the stock flywheel to the lightweight flywheel justifies putting less strain on the motor, and freeing up the extra HP in my book. Keep in mind this is a Drift car and I like Throttle Response.

When it comes to the Injectors I know that the n/a rx7 uses a 460cc top feed high impedance injectorand the turbo II uses 550cc. I am curious though what else could I get injectors off of that would be around this range and would be fairly common at a salvage yard?

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RustspecS13
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Car: '74 260z and '88 300zx turbo

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Yea the turbo mkIII supra, rx7s and dsms are all you'll find with junkyard injectors. And supras and dsm will be picked over while they are being set down. So your best bet is to find some rx7's.

The nice thing about 6cyl's is injector cc will be roughly equivalent to what WHP you'll be able to run. Like the 460's from a rx7 should be about to do 460WHP maxing out the injectors. 400WHP wouldn't be much of a problem for them. Plenty for your goal.

~Alex

crazyandevil05
Posts: 83
Joined: Sun Jul 01, 2007 1:02 pm
Car: 1995 240sx SE, RB25

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i've heard and researched that the 05 ish STI injectors, i think pink colored, are drop in and 440ss i think. i know rock-auto has them for only $40 each on their website.

l0nestar
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crazyandevil05 wrote:i've heard and researched that the 05 ish STI injectors, i think pink colored, are drop in and 440ss i think. i know rock-auto has them for only $40 each on their website.
STi yellow's are side-feed 444's, direct for a 25, not a 20. not sure about the 'pinks'.

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Neejay
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Joined: Sat Jan 03, 2004 3:50 pm

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Bluefire wrote:RB20's and RB25's run t3 turbos, so you'd be looking at a GT3071r and I don't know if they even make .58 a/r...

Don't even worry about a lightened flywheel or driveshaft. Technically this would make the turbo spool slower since theres less load on the engine.

As for injectors, easiest 440cc injectors to find are 7mgte injectors or RB26 injectors, but both are low impedance and require a resistor box. I don't know of any 440cc top feeds that are high impedance
Is this in reference to the 3071r or even on the stock turbo? As I have a lightweight flywheel, but a 1-pc STEEL driveshaft.

DriftNGo
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Joined: Wed Sep 30, 2009 6:47 am

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Neejay wrote:Is this in reference to the 3071r or even on the stock turbo? As I have a lightweight flywheel, but a 1-pc STEEL driveshaft.
I think he is referring to the 3071r... BTW how is the turbo response with the lightweight flywheel?


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