I did a search but I cant find it...

Ive always seen people selling and saying they installed different injectors. They classify them by colors.
like;
Green injectors
White Injectors
Blue Injectors
Orange Injectors

Aside from flow rate what are the differences and potential gains from these?

 

There aren't any gains unless you have a tune for them.

 

Yes I am curious as well. Not from a performance standpoint from a model specific, flow rate? Can anyone chime in or know?

 

The first upgrade to consider in the fuel system would be the <b>injectors</b>, which stock are 315cc/min as I recall. A general rule of thumb on our engines with stock fuel pressure is that for each cc/min of injector size, you can achieve about 1 bhp. So with 315cc/min injectors you can achieve about 315 bhp, or 260-280 whp. There are Bosch-made Volvo injectors which are a direct replacement for the 850's stock orange top injectors. The 70-series T5 cars in 1998 received white injectors which flow roughly 350cc/min. In 1999, all 70 series T5 cars received blue 395cc injectors, which were original equipment on those models for quite a few years. In 2000, the V70R AWD received green 468cc/min injectors, which resurfaced again in 2004 when the R AWD V70 and S60 were introduced. A quick and easy way to up effective injector flow is to put in a Dodge 4-bar fuel pressure regulator from a 2.2 liter turbo Dodge (from the late 80s, early 90s). Which gives an increase in flow over our 3 bar.

Stock 850 Turbo (orange) - 315cc/min 354cc at 4bar
Stock S/V70 1998 (white) - 350cc/min 393cc at 4bar
Stock S/V70 1999 (blue) - 395cc/min 444cc at 4bar
Stock V70R 2000, 2004 and S60 (green) - 468cc/min 526cc at 4bar

I'm just cutting and pasting this but it looks right. The conversions to 4bar are my fault !!

 

The flow rate is the potential gain. I'm starting to use E85 so I need more flow so I went with a 4bar regulator so my injector pulse width doesn't need to increase drastically.

 

So, even if I were to run greens on a stock setup, they would still run like the oranges due to the tune on the ecu? Or would that just scramble things up. Just curious?

 

The article I pulled the quote from said the first upgrade should be injectors ... I didn't follow that and I don't think they are right. More fuel needs more air and usually after getting a good exhaust and some intake modifications you can use some added fuel. Until you get a bigger turbo and a tune bigger injectors aren't really going to do anything for you.

The problem with going too big is you lose the computers ability to idle the engine.

You need to size injectors properly along with pressure, the type of fuel and the way the ECM is set up. On a stock tune I would guess it would run like crap at idle and possibly off idle. It might also kill your MPG and set a check engine light as the pulse rate of the injectors would be so low compared to where the ECM would think it should be.

To jump to a green you are basically pumping in 33% more fuel until the computer compensates and cuts back the pulse rate.

The only power advantage of a bigger injector is pumping in more fuel to allow proper mixture at higher RPMs and wide open throttle. The addition of a bigger injector by itself does nothing to increase power. It is strictly a supporting modification IMHO.

 

When I moved to my blue tune what was setup for whites I had bought greens and just decided to put them in. The car ran like crap. I put the whites back in and it ran fine. I also did this when I first got the whites but did not have the problem. So orange to whites swap went fine but white to green did not.

 

That's the same for me when I had a fuel leak early on and needed to pull my fuel rail. I decided since I was in there I'd up the regulator to a 4bar. With my stock orange injectors it was the same as if I had a stock regulator and whites. The car ran the same as far as I could tell.

stock regulator and orange injectors 315cc/min

Stock regulator and white injectors 350cc/min

4 bar regulator and orange (stock) 354cc/min

Beyond this without a tune you'll start to run into problems. At some point the ECM just can't compensate for the shorter dwell time for the bigger injectors.

 

I just ran across a post over on Volvospeed where someone posted this: "Remember whites and blues flow the exact same, the blue number is just what they flow at a higher pressure."

That takes me a bit by surprise as in all the tables I've seen of the available injectors for our cars no one has ever mentioned the blue injectors were rated at a different pressure than the orange or whites or greens for that matter.

Anyone know anything about this